Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2025	Feb. 06, 2026	Jun. 30, 2025
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-12675
Entity Registrant Name	KILROY REALTY CORPORATION
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	95-4598246
Entity Address, Address Line One	12200 W. Olympic Boulevard
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90064
City Area Code	(310)
Local Phone Number	481-8400
Title of 12(b) Security	Common Stock, $.01 par value
Security Exchange Name	NYSE
Trading Symbol	KRC
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 4,045,451,305
Entity Common Stock, Shares Outstanding		118,503,054
Documents Incorporated by Reference	Portions of the Kilroy Realty Corporation’s Proxy Statement with respect to its 2026 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant’s fiscal year are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0001025996
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Kilroy Realty L.P.
Entity Information [Line Items]
Current Fiscal Year End Date	--12-31
Entity File Number	000-54005
Entity Registrant Name	KILROY REALTY, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4612685
Title of 12(g) Security	Common Units Representing Limited Partnership Interests
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Central Index Key	0001493976
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2025
Entity Information [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Los Angeles, California
Kilroy Realty L.P.
Entity Information [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Los Angeles, California

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Real estate assets:
Land	$ 1,641,913	$ 1,750,820
Buildings and improvements	8,505,486	8,598,751
Undeveloped land and construction in progress	2,387,742	2,309,624
Total real estate assets held for investment	12,535,141	12,659,195
Accumulated depreciation and amortization	(2,843,811)	(2,824,616)
Total real estate assets held for investment, net	9,691,330	9,834,579
Real estate and other assets held for sale, net	115,155	0
Cash and cash equivalents	179,316	165,690
Marketable securities	30,807	27,965
Current receivables (net of allowances of $244 and $314 as of December 31, 2025 and 2024, respectively)	12,765	11,033
Deferred rent receivables, net	424,794	451,996
Deferred leasing costs and acquisition-related intangible assets, net	278,232	225,937
Right of use ground lease assets, net	128,116	129,222
Prepaid expenses and other assets, net	54,561	51,935
Total assets	10,915,076	10,898,357
Liabilities:
Secured debt, net	592,685	598,199
Unsecured debt, net	3,996,774	3,999,566
Accounts payable, accrued expenses, and other liabilities	288,963	285,011
Ground lease liabilities	127,628	128,422
Accrued dividends and distributions	65,009	64,850
Deferred revenue and acquisition-related intangible liabilities, net	125,628	142,437
Rents received in advance and tenant security deposits	75,701	71,003
Liabilities related to real estate assets held for sale	4,945	0
Total liabilities	5,277,333	5,289,488
Commitments and contingencies (Note 17)
Stockholders’ Equity:
Common stock, $.01 par value, 280,000,000 shares authorized, 118,372,451 and 118,046,674 shares issued and outstanding	1,184	1,181
Additional paid-in capital	5,230,747	5,209,653
Retained earnings	188,876	171,212
Total stockholders’ equity	5,420,807	5,382,046
Noncontrolling Interests:
Common units of the Operating Partnership	51,911	52,472
Consolidated property partnerships	165,025	174,351
Total noncontrolling interests	216,936	226,823
Total equity	5,637,743	5,608,869
Total liabilities and equity	$ 10,915,076	$ 10,898,357

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Current receivables, net of allowances	$ 244	$ 314
Common stock, par value ( in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	280,000,000	280,000,000
Common stock, shares issued (in shares)	118,372,451	118,046,674
Common stock, shares outstanding (in shares)	118,372,451	118,046,674

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]	Service [Member]
Revenues:
Rental income	$ 1,093,587	$ 1,118,115	$ 1,117,737
Other property income	19,080	17,514	11,957
Total revenues	1,112,667	1,135,629	1,129,694
Expenses:
Property expenses	243,726	243,441	228,964
Real estate taxes	107,564	108,951	105,868
Ground leases	12,048	11,715	9,732
General and administrative expenses	73,108	71,074	94,264
Leasing costs	10,352	8,764	6,506
Depreciation and amortization	354,854	356,182	355,278
Total expenses	801,652	800,127	800,612
Other Income (Expenses):
Interest income	6,970	37,752	22,592
Interest expense	(126,292)	(145,287)	(114,216)
Other income (expense)	168	(992)	830
Gains on sales of depreciable operating properties	127,038	0	0
Impairment of real estate assets	(16,259)	0	0
Gain on sale of long-lived assets	0	5,979	0
Total other expenses	(8,375)	(102,548)	(90,794)
Net income	302,640	232,954	238,288
Net income attributable to noncontrolling common units of the Operating Partnership	(2,682)	(2,062)	(2,083)
Net income attributable to noncontrolling interests in consolidated property partnerships	(23,837)	(19,923)	(23,964)
Total net income attributable to noncontrolling interests	(26,519)	(21,985)	(26,047)
Net income available to common stockholders	$ 276,121	$ 210,969	$ 212,241
Net income available to common stockholders per share - basic ( in dollars per share)	$ 2.33	$ 1.78	$ 1.80
Net income available to common stockholders per share - diluted (in dollars per share)	$ 2.32	$ 1.77	$ 1.80
Weighted average common units outstanding - basic (in shares)	118,278,990	117,649,111	117,160,173
Weighted average shares of common stock outstanding – diluted (in shares)	118,832,035	118,156,987	117,506,255

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stock- holders’ Equity	Common Stock	Additional Paid-in Capital	Retained Earnings (Distributions in Excess of Earnings)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2022			116,878,031
Beginning balance at Dec. 31, 2022	$ 5,674,961	$ 5,437,047	$ 1,169	$ 5,170,760	$ 265,118	$ 237,914
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	238,288	212,241			212,241	26,047
Issuance of share-based compensation awards	3,110	3,110		3,110
Non-cash amortization of share-based compensation	43,721	43,721		43,721
Net settlement of restricted stock units for shares of common stock (in shares)			361,527
Net settlement of restricted stock units for shares of common stock	(11,595)	(11,595)	$ 4	(11,599)
Distributions to noncontrolling interests in consolidated property partnerships	(30,097)					(30,097)
Adjustment for noncontrolling interest in the Operating Partnership	0	(153)		(153)		153
Dividends declared per share of common stock and common unit	(258,695)	(256,210)			(256,210)	(2,485)
Ending balance (in shares) at Dec. 31, 2023			117,239,558
Ending balance at Dec. 31, 2023	5,659,693	5,428,161	$ 1,173	5,205,839	221,149	231,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	232,954	210,969			210,969	21,985
Issuance of share-based compensation awards	6,675	6,675		6,675
Non-cash amortization of share-based compensation	24,402	24,402		24,402
Net settlement of restricted stock units for shares of common stock (in shares)			807,116
Net settlement of restricted stock units for shares of common stock	(27,636)	(27,636)	$ 8	(27,644)
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)					(23,829)
Adjustment for noncontrolling interest in the Operating Partnership	0	381		381		(381)
Dividends declared per share of common stock and common unit	$ (263,390)	(260,906)			(260,906)	(2,484)
Ending balance (in shares) at Dec. 31, 2024	118,046,674		118,046,674
Ending balance at Dec. 31, 2024	$ 5,608,869	5,382,046	$ 1,181	5,209,653	171,212	226,823
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	302,640	276,121			276,121	26,519
Issuance of share-based compensation awards	2,913	2,913		2,913
Non-cash amortization of share-based compensation	23,968	23,968		23,968
Net settlement of restricted stock units for shares of common stock (in shares)			308,765
Net settlement of restricted stock units for shares of common stock	(6,551)	(6,551)	$ 3	(6,554)
Exchange of common units of the Operating Partnership (in shares)			17,012
Exchange of common units of the Operating Partnership	0	714		714		(714)
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)					(33,163)
Adjustment for noncontrolling interest in the Operating Partnership	0	53		53		(53)
Dividends declared per share of common stock and common unit	$ (260,933)	(258,457)			(258,457)	(2,476)
Ending balance (in shares) at Dec. 31, 2025	118,372,451		118,372,451
Ending balance at Dec. 31, 2025	$ 5,637,743	$ 5,420,807	$ 1,184	$ 5,230,747	$ 188,876	$ 216,936

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends declared per share of common stock and common unit ( in dollars per share)	$ 2.16	$ 2.16	$ 2.16

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 302,640	$ 232,954	$ 238,288
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	349,271	349,828	348,064
Depreciation of non-real estate furniture, fixtures, and equipment	5,583	6,354	7,214
Revenues deemed uncollectible	1,518	2,416	11,553
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(14,644)	(17,605)	(19,181)
Straight-line rents, net	11,628	3,160	(19,262)
Non-cash amortization of net below-market rents	(3,079)	(3,521)	(6,648)
Non-cash amortization of deferred financing costs and debt discounts	4,777	6,893	5,200
Non-cash amortization of share-based compensation awards	19,090	17,714	36,858
Amortization of right of use ground lease assets	1,106	1,066	1,024
Gains on sales of depreciable operating properties	(127,038)	0	0
Impairment of real estate assets	16,259	0	0
Gain on sale of long-lived assets	0	(5,979)	0
Net change in other operating assets	(11,326)	1,894	2,322
Net change in other operating liabilities	10,528	(54,025)	(2,843)
Net cash provided by operating activities	566,313	541,149	602,589
Cash flows from investing activities:
Expenditures for development and redevelopment properties and undeveloped land	(174,687)	(365,521)	(446,426)
Expenditures for operating properties and other capital assets	(116,025)	(100,303)	(97,393)
Expenditures for acquisitions of operating properties	(397,251)	(35,155)	0
Net proceeds received from dispositions of real estate assets	447,938	0	0
Net proceeds received from disposition of long-lived assets	0	19,354	0
Maturity (Purchases) of certificates of deposit	0	256,581	(256,581)
Net cash used in investing activities	(240,025)	(225,044)	(800,400)
Cash flows from financing activities:
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Dividends and distributions paid to common stockholders and common unitholders	(257,861)	(256,306)	(255,430)
Taxes paid upon net share settlement of restricted share units	(6,551)	(27,636)	(11,595)
Financing costs	(4,805)	(18,605)	(10,924)
Principal payments and repayments of secured debt	(6,246)	(6,006)	(5,775)
Proceeds from the issuance of unsecured debt	395,964	395,516	0
Proceeds from the issuance of secured debt	0	0	375,000
Repayments of unsecured debt	(400,000)	(723,712)	0
Borrowings on unsecured debt	0	0	320,000
Repurchases of unsecured debt	0	0	(20,584)
Borrowings on unsecured revolving credit facility	65,000	0	0
Repayments on unsecured revolving credit facility	(65,000)	0	0
Net cash (used in) provided by financing activities	(312,662)	(660,578)	360,595
Net increase (decrease) in cash and cash equivalents and restricted cash	13,626	(344,473)	162,784
Cash and cash equivalents and restricted cash, beginning of year	165,690	510,163	347,379
Cash and cash equivalents and restricted cash, end of year	$ 179,316	$ 165,690	$ 510,163

CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Real estate assets:
Land	$ 1,641,913	$ 1,750,820
Buildings and improvements	8,505,486	8,598,751
Undeveloped land and construction in progress	2,387,742	2,309,624
Total real estate assets held for investment	12,535,141	12,659,195
Accumulated depreciation and amortization	(2,843,811)	(2,824,616)
Total real estate assets held for investment, net	9,691,330	9,834,579
Real estate and other assets held for sale, net	115,155	0
Cash and cash equivalents	179,316	165,690
Marketable securities	30,807	27,965
Current receivables (net of allowances of $244 and $314 as of December 31, 2025 and 2024, respectively)	12,765	11,033
Deferred rent receivables, net	424,794	451,996
Deferred leasing costs and acquisition-related intangible assets, net	278,232	225,937
Right of use ground lease assets, net	128,116	129,222
Prepaid expenses and other assets, net	54,561	51,935
Total assets	10,915,076	10,898,357
Liabilities:
Secured debt, net	592,685	598,199
Unsecured debt, net	3,996,774	3,999,566
Accounts payable, accrued expenses, and other liabilities	288,963	285,011
Ground lease liabilities	127,628	128,422
Accrued distributions	65,009	64,850
Deferred revenue and acquisition-related intangible liabilities, net	125,628	142,437
Rents received in advance and tenant security deposits	75,701	71,003
Liabilities related to real estate assets held for sale	4,945	0
Total liabilities	5,277,333	5,289,488
Commitments and contingencies (Note 17)
Capital:
Consolidated property partnerships	165,025	174,351
Total liabilities and equity	10,915,076	10,898,357
Kilroy Realty L.P.
Real estate assets:
Land	1,641,913	1,750,820
Buildings and improvements	8,505,486	8,598,751
Undeveloped land and construction in progress	2,387,742	2,309,624
Total real estate assets held for investment	12,535,141	12,659,195
Accumulated depreciation and amortization	(2,843,811)	(2,824,616)
Total real estate assets held for investment, net	9,691,330	9,834,579
Real estate and other assets held for sale, net	115,155	0
Cash and cash equivalents	179,316	165,690
Marketable securities	30,807	27,965
Current receivables (net of allowances of $244 and $314 as of December 31, 2025 and 2024, respectively)	12,765	11,033
Deferred rent receivables, net	424,794	451,996
Deferred leasing costs and acquisition-related intangible assets, net	278,232	225,937
Right of use ground lease assets, net	128,116	129,222
Prepaid expenses and other assets, net	54,561	51,935
Total assets	10,915,076	10,898,357
Liabilities:
Secured debt, net	592,685	598,199
Unsecured debt, net	3,996,774	3,999,566
Accounts payable, accrued expenses, and other liabilities	288,963	285,011
Ground lease liabilities	127,628	128,422
Accrued distributions	65,009	64,850
Deferred revenue and acquisition-related intangible liabilities, net	125,628	142,437
Rents received in advance and tenant security deposits	75,701	71,003
Liabilities related to real estate assets held for sale	4,945	0
Total liabilities	5,277,333	5,289,488
Commitments and contingencies (Note 17)
Capital:
Partner’s Capital - Common units, 118,372,451 and 118,046,674 held by the general partner and 1,133,562 and 1,150,574 held by common limited partners issued and outstanding (Note 13)	5,472,718	5,434,518
Consolidated property partnerships	165,025	174,351
Total capital	5,637,743	5,608,869
Total liabilities and equity	$ 10,915,076	$ 10,898,357

CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Current receivables, net of allowances	$ 244	$ 314
Kilroy Realty L.P.
Current receivables, net of allowances	$ 244	$ 314
Common Units \| Kilroy Realty L.P.
General partner, units issued (in shares)	118,372,451	118,046,674
General partner, units outstanding (in shares)	118,372,451	118,046,674
Limited partner, units issued (in shares)	1,133,562	1,150,574
Limited partner, units outstanding (in shares)	1,133,562	1,150,574

CONSOLIDATED STATEMENTS OF OPERATIONS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]	Service [Member]
Revenues:
Rental income	$ 1,093,587	$ 1,118,115	$ 1,117,737
Other property income	19,080	17,514	11,957
Total revenues	1,112,667	1,135,629	1,129,694
Expenses:
Property expenses	243,726	243,441	228,964
Real estate taxes	107,564	108,951	105,868
Ground leases	12,048	11,715	9,732
General and administrative expenses	73,108	71,074	94,264
Leasing costs	10,352	8,764	6,506
Depreciation and amortization	354,854	356,182	355,278
Total expenses	801,652	800,127	800,612
Other Income (Expenses):
Interest income	6,970	37,752	22,592
Interest expense	(126,292)	(145,287)	(114,216)
Other income (expense)	168	(992)	830
Gains on sales of depreciable operating properties	127,038	0	0
Impairment of real estate assets	(16,259)	0	0
Gain on sale of long-lived assets	0	5,979	0
Total other expenses	(8,375)	(102,548)	(90,794)
Net income	302,640	232,954	238,288
Net income attributable to noncontrolling interests in consolidated property partnerships	(26,519)	(21,985)	(26,047)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 276,121	$ 210,969	$ 212,241
Net income available to common stockholders per share - basic ( in dollars per share)	$ 2.33	$ 1.78	$ 1.80
Net income available to common stockholders per share - diluted (in dollars per share)	$ 2.32	$ 1.77	$ 1.80
Weighted average common units outstanding - basic (in shares)	118,278,990	117,649,111	117,160,173
Weighted average common units outstanding - diluted (in shares)	118,832,035	118,156,987	117,506,255
Kilroy Realty L.P.
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]	Service [Member]
Revenues:
Rental income	$ 1,093,587	$ 1,118,115	$ 1,117,737
Other property income	19,080	17,514	11,957
Total revenues	1,112,667	1,135,629	1,129,694
Expenses:
Property expenses	243,726	243,441	228,964
Real estate taxes	107,564	108,951	105,868
Ground leases	12,048	11,715	9,732
General and administrative expenses	73,108	71,074	94,264
Leasing costs	10,352	8,764	6,506
Depreciation and amortization	354,854	356,182	355,278
Total expenses	801,652	800,127	800,612
Other Income (Expenses):
Interest income	6,970	37,752	22,592
Interest expense	(126,292)	(145,287)	(114,216)
Other income (expense)	168	(992)	830
Gains on sales of depreciable operating properties	127,038	0	0
Impairment of real estate assets	(16,259)	0	0
Gain on sale of long-lived assets	0	5,979	0
Total other expenses	(8,375)	(102,548)	(90,794)
Net income	302,640	232,954	238,288
Net income attributable to noncontrolling interests in consolidated property partnerships	(23,837)	(19,923)	(23,964)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 278,803	$ 213,031	$ 214,324
Net income available to common stockholders per share - basic ( in dollars per share)	$ 2.33	$ 1.78	$ 1.80
Net income available to common stockholders per share - diluted (in dollars per share)	$ 2.32	$ 1.77	$ 1.80
Weighted average common units outstanding - basic (in shares)	119,428,865	118,799,685	118,310,747
Weighted average common units outstanding - diluted (in shares)	119,981,910	119,307,561	118,656,829

CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 302,640	$ 232,954	$ 238,288
Non-cash amortization of share-based compensation	23,968	24,402	43,721
Net settlement of restricted stock units for shares of common stock	(6,551)	(27,636)	(11,595)
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Noncontrolling Interests in Consolidated Property Partnerships and Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,519	21,985	26,047
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Kilroy Realty L.P.
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,608,869	5,659,693	5,674,961
Net income	302,640	232,954	238,288
Issuance of share-based compensation awards	2,913	6,675	3,110
Non-cash amortization of share-based compensation	23,968	24,402	43,721
Net settlement of restricted stock units for shares of common stock	(6,551)	(27,636)	(11,595)
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Distributions declared per common unit	(260,933)	(263,390)	(258,695)
Ending balance	$ 5,637,743	$ 5,608,869	$ 5,659,693
Kilroy Realty L.P. \| Partners’ Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	119,197,248	118,390,132	118,028,605
Beginning balance	$ 5,434,518	$ 5,481,436	$ 5,490,571
Net income	278,803	213,031	214,324
Issuance of share-based compensation awards	2,913	6,675	3,110
Non-cash amortization of share-based compensation	$ 23,968	$ 24,402	$ 43,721
Net settlement of restricted stock units (in shares)	308,765	807,116	361,527
Net settlement of restricted stock units for shares of common stock	$ (6,551)	$ (27,636)	$ (11,595)
Distributions declared per common unit	$ (260,933)	$ (263,390)	$ (258,695)
Ending balance (in shares)	119,506,013	119,197,248	118,390,132
Ending balance	$ 5,472,718	$ 5,434,518	$ 5,481,436
Kilroy Realty L.P. \| Noncontrolling Interests in Consolidated Property Partnerships and Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	174,351	178,257	184,390
Net income	23,837	19,923	23,964
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Ending balance	$ 165,025	$ 174,351	$ 178,257

CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Kilroy Realty L.P.
Distributions declared per common unit (dollars per share)	$ 2.16	$ 2.16	$ 2.16

CONSOLIDATED STATEMENTS OF CASH FLOWS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 302,640	$ 232,954	$ 238,288
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	349,271	349,828	348,064
Depreciation of non-real estate furniture, fixtures, and equipment	5,583	6,354	7,214
Revenues deemed uncollectible	1,518	2,416	11,553
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(14,644)	(17,605)	(19,181)
Straight-line rents, net	11,628	3,160	(19,262)
Non-cash amortization of net below-market rents	(3,079)	(3,521)	(6,648)
Non-cash amortization of deferred financing costs and net debt discounts	4,777	6,893	5,200
Non-cash amortization of share-based compensation awards	19,090	17,714	36,858
Amortization of right of use ground lease assets	1,106	1,066	1,024
Gains on sales of depreciable operating properties	(127,038)	0	0
Impairment of real estate assets	16,259	0	0
Gain on sale of long-lived assets	0	(5,979)	0
Net change in other operating assets	(11,326)	1,894	2,322
Net change in other operating liabilities	10,528	(54,025)	(2,843)
Net cash provided by operating activities	566,313	541,149	602,589
Cash flows from investing activities:
Expenditures for development and redevelopment properties and undeveloped land	(174,687)	(365,521)	(446,426)
Expenditures for operating properties and other capital assets	(116,025)	(100,303)	(97,393)
Expenditures for acquisitions of operating properties	(397,251)	(35,155)	0
Net proceeds received from dispositions of real estate assets	447,938	0	0
Net proceeds received from disposition of long-lived assets	0	19,354	0
Maturity (Purchases) of certificates of deposit	0	256,581	(256,581)
Net cash used in investing activities	(240,025)	(225,044)	(800,400)
Cash flows from financing activities:
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Distributions paid to common unitholders	(257,861)	(256,306)	(255,430)
Taxes paid upon net share settlement of restricted share units	(6,551)	(27,636)	(11,595)
Financing costs	(4,805)	(18,605)	(10,924)
Principal payments and repayments of secured debt	(6,246)	(6,006)	(5,775)
Proceeds from the issuance of unsecured debt	395,964	395,516	0
Proceeds from the issuance of secured debt	0	0	375,000
Repayments of unsecured debt	(400,000)	(723,712)	0
Borrowings on unsecured debt	0	0	320,000
Repurchases of unsecured debt	0	0	(20,584)
Borrowings on unsecured revolving credit facility	65,000	0	0
Repayments on unsecured revolving credit facility	(65,000)	0	0
Net cash (used in) provided by financing activities	(312,662)	(660,578)	360,595
Net increase (decrease) in cash and cash equivalents and restricted cash	13,626	(344,473)	162,784
Cash and cash equivalents and restricted cash, beginning of year	165,690	510,163	347,379
Cash and cash equivalents and restricted cash, end of year	179,316	165,690	510,163
Kilroy Realty L.P.
Cash flows from operating activities:
Net income	302,640	232,954	238,288
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	349,271	349,828	348,064
Depreciation of non-real estate furniture, fixtures, and equipment	5,583	6,354	7,214
Revenues deemed uncollectible	1,518	2,416	11,553
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(14,644)	(17,605)	(19,181)
Straight-line rents, net	11,628	3,160	(19,262)
Non-cash amortization of net below-market rents	(3,079)	(3,521)	(6,648)
Non-cash amortization of deferred financing costs and net debt discounts	4,777	6,893	5,200
Non-cash amortization of share-based compensation awards	19,090	17,714	36,858
Amortization of right of use ground lease assets	1,106	1,066	1,024
Gains on sales of depreciable operating properties	(127,038)	0	0
Impairment of real estate assets	16,259	0	0
Gain on sale of long-lived assets	0	(5,979)	0
Net change in other operating assets	(11,326)	1,894	2,322
Net change in other operating liabilities	10,528	(54,025)	(2,843)
Net cash provided by operating activities	566,313	541,149	602,589
Cash flows from investing activities:
Expenditures for development and redevelopment properties and undeveloped land	(174,687)	(365,521)	(446,426)
Expenditures for operating properties and other capital assets	(116,025)	(100,303)	(97,393)
Expenditures for acquisitions of operating properties	(397,251)	(35,155)	0
Net proceeds received from dispositions of real estate assets	447,938	0	0
Net proceeds received from disposition of long-lived assets	0	19,354	0
Maturity (Purchases) of certificates of deposit	0	256,581	(256,581)
Net cash used in investing activities	(240,025)	(225,044)	(800,400)
Cash flows from financing activities:
Distributions to noncontrolling interests in consolidated property partnerships	(33,163)	(23,829)	(30,097)
Distributions paid to common unitholders	(257,861)	(256,306)	(255,430)
Taxes paid upon net share settlement of restricted share units	(6,551)	(27,636)	(11,595)
Financing costs	(4,805)	(18,605)	(10,924)
Principal payments and repayments of secured debt	(6,246)	(6,006)	(5,775)
Proceeds from the issuance of unsecured debt	395,964	395,516	0
Proceeds from the issuance of secured debt	0	0	375,000
Repayments of unsecured debt	(400,000)	(723,712)	0
Borrowings on unsecured debt	0	0	320,000
Repurchases of unsecured debt	0	0	(20,584)
Borrowings on unsecured revolving credit facility	65,000	0	0
Repayments on unsecured revolving credit facility	(65,000)	0	0
Net cash (used in) provided by financing activities	(312,662)	(660,578)	360,595
Net increase (decrease) in cash and cash equivalents and restricted cash	13,626	(344,473)	162,784
Cash and cash equivalents and restricted cash, beginning of year	165,690	510,163	347,379
Cash and cash equivalents and restricted cash, end of year	$ 179,316	$ 165,690	$ 510,163

Organization and Ownership

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Ownership

Kilroy Realty Corporation (the “Company”) is a self-administered real estate investment trust (“REIT”) active in premier office, life science, and mixed-use property types in the United States. Our approach to modern business environments is designed to drive creativity and productivity for some of the world’s leading technology, media, life science, and business services companies and we have been consistently recognized for our leadership in sustainability and building operations. We own, develop, acquire, and manage real estate assets, consisting primarily of premier office and life science properties in the San Francisco Bay Area, Los Angeles, Seattle, San Diego, and Austin, which are markets we believe have strategic advantages and strong barriers to entry. The Company qualifies as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). The Company’s common stock is publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “KRC.”

We own our interests in all of our real estate assets through Kilroy Realty, L.P. (the “Operating Partnership”) and conduct substantially all of our operations through the Operating Partnership. Unless stated otherwise or the context otherwise requires, the terms “Kilroy Realty Corporation” or the “Company,” “we,” “our,” and “us” refer to Kilroy Realty Corporation and its consolidated subsidiaries, including the Operating Partnership, and the term “Operating Partnership” refers to Kilroy Realty, L.P. and its consolidated subsidiaries. The descriptions of our business, employees, and properties apply to both the Company and the Operating Partnership.

Our stabilized portfolio includes all of our properties with the exception of development and redevelopment properties currently committed for construction, under construction, or in the tenant improvement phase, undeveloped land, and real estate assets held for sale, if any.

Our stabilized portfolio of operating properties was comprised of the following properties at December 31, 2025:


	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percentage Occupied (unaudited) (1)
Stabilized Office Properties (2)	121	16,292,164	438	81.6	%

_______________________

(1)Represents economic occupancy for space where we have achieved revenue recognition for the associated lease agreements.

(2)Includes stabilized life science and retail space.


	Number of Properties	Number of Units	2025 Average Occupancy (unaudited)
Stabilized Residential Properties	3	1,001	94.1	%

As of December 31, 2025, the following projects were excluded from our stabilized portfolio:


	Number of Properties / Projects	Actual / Estimated Rentable Square Feet (unaudited) (1)
Properties held for sale (2)	1	427,764
In-process development project - tenant improvement	1	871,738

____________________

(1)For the property classified as held for sale, represents actual rentable square feet and consists of three buildings. For the in-process development project in the tenant improvement phase, represents estimated rentable square feet upon completion.

(2)See Note 4 “Dispositions and Held For Sale” for additional information.

Our stabilized portfolio also excludes our future development pipeline, which, as of December 31, 2025, was comprised of eight potential future development sites.

As of December 31, 2025, all of our properties and development and redevelopment projects, and all of our business was conducted in the state of California, with the exception of ten stabilized office properties and one future development project located in the state of Washington, and one stabilized office property and one future development project located in Austin, Texas. All of our properties and development and redevelopment projects are 100% owned, excluding the following four office properties owned by three consolidated property partnerships. Refer to Note 2 “Basis of Presentation and Significant Accounting Policies” for further discussion of the Company’s consolidated property partnerships.

Consolidated Property Partnership

Property Address

Ownership Interest (1) (2)

100 First Street Member, LLC

100 1st Street, San Francisco, CA 94105

56%

303 Second Street Member, LLC

303 2nd Street, San Francisco, CA 94107

56%

Redwood City Partners, LLC

900 Jefferson Avenue, Redwood City, CA 94063

93%

900 Middlefield Road, Redwood City, CA 94063

________________________

(1)Reflects the Company’s ownership percentage at time of agreement. Actual percentage may vary depending on cash flows or promote structure.

(2)The remaining interests in all three property partnerships were owned by unrelated third parties.

As of December 31, 2025, the Company owned an approximate 99.1% common general partnership interest in the Operating Partnership, and the remaining approximate 0.9% common limited partnership interest in the Operating Partnership as of December 31, 2025 was owned by non-affiliated investors. Both the general and limited common partnership interests in the Operating Partnership are denominated in common units. Generally, the number of common units held by the Company is equivalent to the number of outstanding shares of the Company’s common stock, and the rights of all the common units to quarterly distributions and payments in liquidation mirror those of the Company’s common stockholders. The common limited partners have certain redemption rights as provided in the Operating Partnership’s Seventh Amended and Restated Agreement of Limited Partnership, as amended (the “Partnership Agreement”). With the exception of the Operating Partnership and our consolidated property partnerships, all of our subsidiaries are wholly-owned.

Basis of Presentation and Significant Accounting Policies

12 Months Ended

Dec. 31, 2025

Basis of Presentation and Significant Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Consolidated Property Partnerships, and all of our wholly-owned and controlled subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Consolidated Property Partnerships, and all of our wholly-owned and controlled subsidiaries. All intercompany balances and transactions have been eliminated in the consolidated financial statements.

Reclassification of Prior Period Amounts

Commencing January 1, 2025, the Company began presenting a new line item, Other income (expense), which includes tax expenses, acquisition and disposition expenses, and income or expenses related to environmental and sustainability initiatives, which were previously included in General and administrative expenses. Historical amounts for General and administrative expenses and Other income (expense) have been revised to conform with the current period presentation, which resulted in no change to consolidated net income.

During the year ended December 31, 2025, the Company combined certain line items in the Consolidated Statements of Equity. The Company determined that separate disclosure for certain line items was not meaningful to the users of the financial statements. The settlement of restricted stock units for shares of common stock is now presented net of shares withheld and payments made to settle tax obligations. Historical presentation has been revised to conform with the current period presentation. These presentation changes did not affect the total equity balance, net income, or earnings per share in any of the periods reported.

Partially Owned Entities and Variable Interest Entities

Our accounting policy is to consolidate entities in which we have a controlling financial interest and significant decision making control over the entity’s operations. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, size of our investment (including loans), authority to control decisions, and contractual and substantive participating rights of the members. In addition to evaluating control rights, we consolidate entities in which the other members have no substantive kick-out rights to remove the Company as the managing member.

Entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or the holders of the equity investment at risk do not have a controlling financial interest are variable interest entities (“VIEs”). We evaluate whether an entity is a VIE and whether we are the primary beneficiary. We are deemed to be the primary beneficiary of a VIE when we have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or receive benefits that could potentially be significant to the VIE.

The Operating Partnership is a VIE that is consolidated by the Company as the primary beneficiary, as the Operating Partnership is a limited partnership in which the common limited partners do not have substantive kick-out or participating rights. At December 31, 2025, the consolidated financial statements of the Company included two VIEs in addition to the Operating Partnership: 100 First LLC and 303 Second LLC. At December 31, 2024, the consolidated financial statements of the Company included three VIEs in addition to the Operating Partnership: 100 First LLC, 303 Second LLC, and one entity established during the third quarter of 2024 to facilitate a potential future Section 1031 Exchange. The Company and the Operating Partnership were determined to be the primary beneficiaries of these VIEs at December 31, 2025 and 2024, since we had the ability to control the activities that most significantly impact each of the VIEs’ economic performance. Revenues, income, and net assets generated by 100 First LLC and 303 Second LLC may only be used to settle their contractual obligations, which primarily consist of operating expenses, capital expenditures, and required distributions. The following table summarizes the total assets, liabilities, and noncontrolling interests included on our consolidated balance sheets attributable to these VIEs:


	December 31, 2025		December 31, 2024
	($ in thousands)
Number of VIEs	2		3
Total assets (1)	$	380,940	$	435,478
Total liabilities	$	18,304	$	18,047
Total noncontrolling interests	$	160,299	$	169,445

____________________

(1)Includes $319.4 million and $357.3 million related to real estate assets held for investment, net, as of December 31, 2025 and 2024, respectively.

If the requirements for consolidation are not met, the Company would account for investments under the equity method of accounting if we have the ability to exercise significant influence over the entity. Equity method investments would be initially recorded at cost and subsequently adjusted for our share of net income or loss and cash contributions and distributions each period. The Company did not have any equity method investments at December 31, 2025 or 2024.

Significant Accounting Policies

Revenue Recognition

Rental revenue for office, life science, retail, and residential operating properties is our principal source of revenue. We recognize revenue from base rent (fixed lease payments), additional rent (variable lease payments, which consist of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs), parking, and other lease-related revenue once all of the following criteria are met: (i) the agreement has been fully executed and delivered, (ii) services have been rendered, (iii) the amount is fixed or determinable, and (iv) payment has been received or the collectability of substantially all of the amount due is probable. Minimum

annual rental revenues are recognized in rental revenues on a straight-line basis over the non-cancellable term of the related lease.

Base Rent

The timing of when we commence rental revenue recognition for office, life science, and retail properties depends largely on our conclusion as to whether we are or the tenant is the owner of tenant improvements at the leased property for accounting purposes. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements as an asset and commence rental revenue recognition when the tenant takes possession of or controls the finished space, which is generally when tenant improvements being recorded as our assets are substantially complete. In certain instances, when we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, rental revenue recognition begins when the tenant takes possession or controls the physical use of the leased space. The determination of who owns the tenant improvements is made on a lease-by-lease basis and has a significant effect on the timing of commencement of revenue recognition. Further, we may deliver leased space in phases, rather than for an entire building or project, resulting in various revenue commencement dates for a particular lease, which involves significant judgment surrounding when the tenant takes possession of or controls each respective phase, building or project.

When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements, including costs paid for or reimbursed by the tenants, as our capital asset. For these tenant-funded tenant improvements, we record the amount funded by or reimbursed by tenants as deferred revenue, which is amortized and recognized as rental income on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises.

When we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, we record our contribution towards those tenant-owned improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangible assets, net, on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises.

For residential properties, we commence revenue recognition upon lease commencement. Residential rental revenue is recognized on a straight-line basis over the term of the related lease, which is generally one year, net of any concessions.

When a lease is amended, we determine whether (i) an additional right of use not included in the original lease is being granted as a result of the modification, and (ii) there is an increase in the lease payments that is commensurate with the standalone price for the additional right of use. If both of these conditions are met, the amendment is accounted for as a separate lease contract. If either of those conditions are not met, the amendment is accounted for as a lease modification. Most of our lease amendments are accounted for as modifications of our operating leases, which requires us to reassess both the lease term and fixed lease payments, including any prepaid or deferred rent receivables relating to the original lease, as a part of the lease payments for the modified lease.

Termination options in some of our leases allow the tenant to terminate the lease, in part or in whole, prior to the end of the lease term under certain circumstances. Termination options generally require advance notification from the tenant and payment of a termination fee that reimburses us for a portion of the remaining rent under the original lease term and the net book value of lease inception costs such as commissions, tenant improvements and lease incentives. Termination fee income, included in rental income, is recognized on a straight-line basis from the date of the executed termination agreement through the revised lease expiration when the amount of the fee is determinable and collectability of the fee is probable. This fee income is reduced on a straight-line basis by any deferred rent receivable related to the lease.

Generally, our leases require the tenant to restore the leased space to standard office condition upon the expiration of the lease. In some circumstances, tenants may negotiate to pay us a restoration fee in lieu of restoring the space. Restoration fee income, included in rental income, is recognized on a straight-line basis from the date of

the executed restoration fee agreement through lease expiration when the amount of the fee is determinable and collectability of the fee is probable.

When tenants declare bankruptcy, we may be able to collect some portion of their past-due rents through the bankruptcy process, whether through applying security deposit balances, drawing on tenants’ letters of credit, or through bankruptcy settlements. We recognize any amounts collected through the bankruptcy process when cash is received.

Additional Rent - Reimbursements from Tenants

Leases typically provide for the reimbursement of certain property operating expenses accounted for as additional rent, which consists of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, and is recognized in rental income in the period the recoverable costs are incurred. Additional rent where we pay the associated costs directly to third-party vendors and are reimbursed by our tenants are recognized and recorded on a gross basis, with the associated expense recognized in property expenses or real estate taxes.

Other Property Income

Other property income primarily includes amounts recorded in connection with transient daily parking, broken deal income, and property damage settlement-related payments in excess of losses incurred received from third-party insurance carriers. Other property income also includes miscellaneous income from tenants and fees for late rental payments. Amounts recorded within other property income fall within the scope of ASC Topic 606 “Revenue from Contracts with Customers” and are recognized as revenue at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied.

Uncollectible Lease Receivables and Allowances for Tenant and Deferred Rent Receivables

Current tenant receivables consist primarily of amounts due for contractual lease payments and reimbursements of common area maintenance expenses, property taxes, and other costs recoverable from tenants. Deferred rent receivables represent the excess of the cumulative straight-line rental revenue recorded to date over cash rents billed to date under the lease agreement.

We carry our current and deferred rent receivables net of allowances for amounts that may not be collected, which are adjusted through rental income. The adequacy of these allowances is assessed quarterly using a binary assessment of whether or not substantially all of the amounts due under a tenant’s lease agreement are probable of collection. This assessment incorporates specific identification and aging analyses, considering the current economic and business environment, including factors such as the age and nature of the receivables, tenant payment history and financial condition, our assessment of the tenant’s ability to meet its lease obligations, and the status of negotiations of any disputes with the tenant. Significant judgment is required, and actual results may differ materially from estimates due to factors beyond our control.

For leases that are deemed probable of collection, revenue continues to be recorded on a straight-line basis over the non-cancellable lease term, with partial allowances for uncollectible accounts exhibiting a certain level of collection risk. For leases that are deemed not probable of collection, revenue is recorded as the lesser of (i) cash received, or (ii) the amount recognized on a straight-line basis with any tenant and deferred rent receivable balances charged as a direct write-off against rental income in the period of the change in the collectability determination. If the collectability determination subsequently changes to being probable of collection for leases for which revenue is recorded based on cash received from the tenant, we resume recognizing revenue, including deferred revenue, on a straight-line basis and recognize incremental revenue related to the reinstatement of cumulative deferred rent receivable and deferred revenue balances, as if revenue had been recorded on a straight-line basis since the inception of the lease.

Acquisitions

Acquisitions of operating properties and development and redevelopment opportunities generally do not meet the definition of a business and are accounted for as asset acquisitions, as substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. For these asset acquisitions, we record the acquired tangible and intangible assets and assumed liabilities based on each asset’s and liability’s relative fair value compared to the total purchase price plus any capitalized closing costs, including costs incurred during negotiation.

Fair values are determined using estimated cash flow projections, market information and discount and/or capitalization rates, considering historical operating results, known and anticipated trends, and market and economic conditions. The acquired assets and assumed liabilities for an acquisition generally include, but are not limited to: (i) land and improvements, buildings and improvements, undeveloped land, and construction in progress, and (ii) identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values, and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at relative fair value on the date of acquisition.

The fair value of land and improvements is derived from comparable sales of land and improvements within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements, and leasing costs considers the value of the property as if it was vacant as well as current replacement costs and other relevant market rate information.

The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term, and (ii) management’s estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangible assets, net, on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related intangible liabilities, net, on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable. The amortization of a below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented. The amortization of an above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.

The fair value of acquired in-place leases is derived based on management’s assessment of lost revenue and costs incurred for the period required to lease the “assumed vacant” property to the occupancy level when purchased. This fair value is based on a variety of considerations, including, but not necessarily limited to: (i) the value associated with lost rental revenue from existing leases during the assumed lease-up period; (ii) the value associated with avoiding the cost of originating the acquired in-place leases; and (iii) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period. Factors we consider in performing these analyses include an estimate of the carrying costs during the expected lease-up periods, current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance, and other operating expenses, and estimates of lost rental revenue during the expected lease-up periods based on current market demand at market rates. In estimating costs to execute similar leases, we consider leasing commissions, legal, and other related expenses. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangible assets, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases.

The determination of the fair value of any debt assumed in connection with a property acquisition is estimated by discounting the future cash flows using market interest rates available for the issuance of debt with similar terms and remaining maturities.

The determination of the fair value of the acquired tangible and intangible assets and assumed liabilities of acquisitions requires us to make significant judgments and assumptions about the numerous inputs discussed above. The use of different assumptions in these fair value calculations could significantly affect the reported amounts of the allocation of our acquisition related assets and liabilities and the related depreciation and amortization expense recorded for such assets and liabilities. In addition, because the value of above and below-market leases are amortized as either a reduction or increase to rental income, respectively, our judgments for these intangibles could have a significant impact on our reported rental revenues and results of operations.

Transaction costs associated with our acquisitions, including costs incurred during negotiation, are capitalized as part of the purchase price of the acquisition.

Operating Properties

Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and extension of the useful life of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred.

Cost Capitalization

We capitalize all costs associated with development and redevelopment activities, capital improvements, and tenant improvements as project costs, including internal compensation costs related to those activities. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for their intended use are in progress: pre-construction costs essential to the development of the property, interest costs based on the weighted average interest rate of our outstanding indebtedness for the period, real estate taxes, and insurance.

Determining whether expenditures meet the criteria for capitalization requires management to exercise significant judgment. Expenditures that meet one or more of the following criteria generally qualify for capitalization:

•Provide benefit in future periods;

•Extend the useful life of the asset beyond our original estimates; and

•Increase the quality of the asset beyond our original estimates.

We define redevelopment properties as those properties for which we expect to spend significant development and construction costs pursuant to a formal plan to change its use, the intended result of which is a higher economic return on the property.

We define a property in the tenant improvement phase as a development or redevelopment property where the project has reached “cold shell condition” and is ready for tenant improvements, which may require additional major base building modifications before being placed in service. Projects in the tenant improvement phase are moved into our stabilized portfolio once the project reaches the earlier of 95% occupancy or one year from the date of the cessation of major base building construction activities.

For office, life science, and retail development and redevelopment properties, the date the capitalization period ends is based on property-specific leasing activity:

•For properties that are pre-leased, we cease capitalization when revenue recognition has commenced on the leased space, which is upon substantial completion of tenant improvements deemed to be the Company’s asset for accounting purposes.

•For properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore, we cease capitalization and begin depreciation on the portion of the property for which revenue recognition has commenced on the leased space, but in any event, no later than one year after the cessation of major base building construction activities. Revenue recognition commences on leased space upon substantial completion of the tenant improvements deemed to be the Company’s asset for accounting purposes. We also cease capitalization when activities necessary to prepare the property for its intended use have been suspended.

Once major base building construction activities have ceased and the development or redevelopment property (or phases thereof) have been placed in service, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property.

Evaluation of Asset Impairment

We evaluate our real estate assets, including land held for future development, for potential impairment whenever events or changes in circumstances indicate that the carrying amount of a given asset may not be recoverable. This evaluation is performed property-by-property basis. Factors we use to determine whether an impairment evaluation is necessary include:

•low occupancy levels, forecasted low occupancy levels, or near term lease expirations at a specific property;

•current period operating or cash flow losses combined with a historical pattern or future projection of potential continued operating or cash flow losses at a specific property;

•deterioration in rental rates for a specific property as evidenced by sudden significant rental rate decreases or continuous rental rate decreases over numerous quarters, which could signal a continued decrease in future cash flows for that property;

•deterioration of a given rental submarket as evidenced by significant increases in market vacancy and/or negative absorption rates, or continuous increases in market vacancy and/or negative absorption rates over numerous quarters, which could signal a decrease in future cash flows for properties within that submarket;

•significant increases in property sales yields, continuous increases in property sales yields over several quarters, or recent property sales at a loss within a given submarket, each of which could signal a decrease in the market value of properties;

•significant change in strategy or use of a specific property, or any other event that could result in a decreased holding period, including classifying a property as held for sale, or significant development delay;

•evidence of material physical damage to the property; and

•default by a significant tenant when any of the other indicators above are present.

When evaluating operating real estate assets to be held and used for potential impairment, including land held for future development, we first evaluate whether there are any indicators of impairment. If any impairment indicators are present for a specific real estate asset, we compare the asset’s net carrying amount to its estimated undiscounted future cash flows over the anticipated holding period. If the carrying amount exceeds these cash flows, we calculate an impairment loss by comparing the carrying amount to the asset’s estimated fair value, using discounted cash flow models or third-party appraisals. An impairment loss recognized sets a new cost basis for the asset, which is then depreciated over its remaining useful life. Assets held for sale are carried at the lower of carrying value or fair value less closing costs, and depreciation ceases.

Depreciation and Amortization of Buildings and Improvements and Furniture, Fixtures, and Other Long-Lived Assets

The costs of buildings and improvements, tenant improvements, and furniture, fixtures and other long-lived assets are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements for the three years ended December 31, 2025, 2024, and 2023 was $305.8 million, $308.0 million, and $300.1 million, respectively:


Asset Description						Depreciable Lives
Buildings and improvements (1)						25 – 40 years
Tenant improvements (2)						1 - 20 years
Furniture, fixtures, and other long-lived assets (3)						1 - 5 years

____________________

(1)Building improvements associated with in-process capital improvement projects begin depreciation once placed in service.

(2)Tenant improvements are amortized over the shorter of the lease term or the estimated useful life.

(3)Accumulated depreciation for furniture, fixtures, and other long-lived assets is included in “Prepaid expense and other assets, net” on our consolidated balance sheets.

Real Estate Assets Held for Sale and Dispositions

A real estate asset is classified as held for sale when certain criteria are met, including, but not limited to, the availability of the asset for immediate sale, the existence of an active program to locate a buyer, and the probable sale or transfer of the asset within one year. If such criteria are met, we present the applicable assets and liabilities related to the real estate asset, if material, separately on the balance sheet as held for sale and we would cease to record depreciation and amortization expense. Real estate assets held for sale are reported at the lower of carrying value or fair value less costs to sell.

The net gains (losses) on dispositions of non-depreciable real estate property (i.e. land) are reported in the consolidated statements of operations as gains (losses) on sale of land in the period the land is sold. The net gains (losses) on dispositions of certain other depreciable assets, such as a corporate aircraft, are reported in the consolidated statements of operations as gains (loss) on sales of long-lived assets in the period the asset is sold. The net gains (losses) on dispositions of depreciable real estate property are reported in the consolidated statements of operations as gains (losses) on sales of depreciable operating properties in the period the property is sold.

Cash and Cash Equivalents

We consider all highly-liquid investments, including certificates of deposit, with original maturities of three months or less to be cash equivalents.

Restricted Cash

Restricted cash consists of cash proceeds from dispositions that are temporarily held at qualified intermediaries for purposes of facilitating potential Section 1031 Exchanges, and cash held in escrow related to acquisition and disposition holdbacks. Restricted cash may also include cash held as collateral to provide credit enhancement for the Operating Partnership’s mortgage debt, including cash reserves for capital expenditures, tenant improvements, and property taxes. We did not have any restricted cash at December 31, 2025 and 2024.

Marketable Securities

Marketable securities reported in our consolidated balance sheets represent assets held in connection with the Kilroy Realty Corporation 2007 Deferred Compensation Plan (the “Deferred Compensation Plan”) (see Note 15 “Employee Benefit Plans” for additional information). These assets are held in a limited rabbi trust and invested in various mutual and money market funds. As a result, the marketable securities are treated as trading securities for financial reporting purposes and are adjusted to fair value at the end of each reporting period.

At the time eligible management employees (“Participants”) defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the marketable securities held in connection with the Deferred Compensation Plan generally offset and therefore do not significantly impact net income.

Deferred Leasing Costs

Costs incurred in connection with successful property leasing are capitalized as deferred leasing costs and classified as investing activities in the statement of cash flows. Deferred leasing costs consist of leasing commissions paid to external third-party brokers and lease incentives, and are amortized using the straight-line method of accounting over the lives of the associated leases which generally range from one to 20 years. We may re-evaluate the remaining useful lives of leasing costs as the creditworthiness of our tenants and economic and market conditions change. If we determine that the estimated remaining life of a lease has changed, we adjust the amortization period accordingly. Fully amortized deferred leasing costs are written off each quarter.

Deferred Financing Costs

Financing costs related to the origination or assumption of long-term debt are deferred and generally amortized into interest expense using the straight-line method of accounting, which approximates the effective interest method, over the contractual terms of the applicable financings. Deferred financing costs incurred in connection with the establishment of the unsecured revolving credit facility are initially recorded as prepaid assets on the balance sheet and subsequently amortized to interest expense over the contractual term of the facility, typically using the straight-line method.

Debt Discounts and Premiums

Original issuance debt discounts and discounts/premiums related to recording debt acquired in connection with operating property acquisitions at fair value are generally amortized and accreted on a straight-line basis, which approximates the effective interest method. Discounts are recorded as additional interest expense from date of issuance or acquisition through the contractual maturity date of the related debt. Premiums are recorded as a reduction to interest expense from the date of issuance or acquisition through the contractual maturity date of the related debt.

Noncontrolling Interests - Common Units of the Operating Partnership in the Company’s Consolidated Financial Statements

Common units of the Operating Partnership within noncontrolling interests in the Company’s consolidated financial statements represent the common limited partnership interests in the Operating Partnership not held by the Company (“noncontrolling common units”). Noncontrolling common units are presented in the equity section of the Company’s consolidated balance sheets and are reported at their proportionate share of the net assets of the Operating Partnership. Noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or shares of common stock must be further evaluated to determine whether equity or temporary equity classification on the balance sheet is appropriate. Since the common units contain such a provision, we evaluated the accounting guidance and determined that the common units qualify for equity presentation in the Company’s consolidated financial statements. Net income attributable to noncontrolling common units is allocated based on their relative ownership percentage of the Operating Partnership during the reported period. The noncontrolling interest ownership percentage is determined by dividing the number of noncontrolling common units by the total number of common units outstanding. The issuance or redemption of additional shares of common stock or common units results in changes to the noncontrolling interest percentage as well as the total net assets of the Company. As a result, all equity transactions result in an allocation between equity and the noncontrolling interest in the Company’s

consolidated balance sheets and statements of equity to account for the changes in the noncontrolling interest ownership percentage as well as the change in total net assets of the Company.

Noncontrolling Interests in Consolidated Property Partnerships

Noncontrolling interests in consolidated property partnerships represent the equity interests held by unrelated third parties in our three consolidated property partnerships (see Note 10 “Noncontrolling Interests on the Company’s Consolidated Financial Statements” and see Note 11 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements”). Noncontrolling interests in consolidated property partnerships are not redeemable and are presented as permanent equity in the Company’s consolidated balance sheets. We account for the noncontrolling interests in consolidated property partnerships using the hypothetical liquidation at book value (“HLBV”) method to attribute the earnings or losses of the consolidated property partnerships between the controlling and noncontrolling interests. Under the HLBV method, the amounts reported as noncontrolling interests in consolidated property partnerships in the consolidated balance sheets represent the amounts the noncontrolling interests would hypothetically receive at each balance sheet reporting date under the liquidation provisions of the governing agreements assuming the net assets of the consolidated property partnerships were liquidated at recorded amounts and distributed between the controlling and noncontrolling interests in accordance with the governing documents. The net income attributable to noncontrolling interests in consolidated property partnerships in the consolidated statements of operations is associated with the increase or decrease in the noncontrolling interest holders’ contractual claims on the respective entities’ balance sheets assuming a hypothetical liquidation at the end of that reporting period when compared with their claims on the respective entities’ balance sheets assuming a hypothetical liquidation at the beginning of that reporting period, after removing the impact of any contributions or distributions.

Common Partnership Interests on the Operating Partnership’s Consolidated Balance Sheets

The common units held by the Company and the noncontrolling common units held by the common limited partners are both presented in the permanent equity section of the Operating Partnership’s consolidated balance sheets in partners’ capital. The redemption rights of the noncontrolling common units permit us to settle the redemption obligation in either cash or shares of the Company’s common stock at our option (see Note 10 “Noncontrolling Interests on the Company’s Consolidated Financial Statements” for additional information).

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements

Noncontrolling interests in the Operating Partnership’s consolidated financial statements include the noncontrolling interest in property partnerships (See Note 11 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements”).

Equity Offerings

Underwriting commissions and offering costs incurred in connection with common equity offerings and any at-the-market stock offering programs (See Note 12 “Stockholders’ Equity of the Company”) are reflected as a reduction of additional paid-in capital.

The net proceeds from any equity offering of the Company are generally contributed to the Operating Partnership in exchange for a number of common units equivalent to the number of shares of common stock issued and are reflected in the Operating Partnership’s consolidated financial statements as an increase in partners’ capital.

Share-Based Incentive Compensation Accounting

Compensation cost for all share-based awards requires measurement at estimated fair value on the grant date. Compensation cost is recognized on a straight-line basis over the requisite service period. The grant date fair value of share-based awards with market conditions are calculated using a Monte Carlo simulation pricing model. Forfeitures of all share-based awards are recognized when they occur.

For share-based awards in which the performance period precedes the grant date, we recognize compensation cost over the requisite service period, which includes both the performance and service vesting periods, using the accelerated attribution expense method. The requisite service period begins on the date the Executive Compensation Committee authorizes the award and adopts any relevant performance measures.

For share-based awards with performance conditions, the total estimated compensation cost is based on our most recent estimate of the probable achievement of the pre-established specific performance measures. These estimates are based on actual results and our latest internal forecasts for each performance measure. For share-based awards with market conditions, the total estimated compensation cost is based on the fair value of the award at the grant date. For share-based awards with performance conditions and market conditions, the total estimated compensation cost is based on the fair value per share at the grant date multiplied by our most recent estimate of the number of shares to be earned based on actual results and the probable achievement of the pre-established corporate performance measures based on our latest internal forecasts.

In accordance with the provisions of our share-based incentive compensation plan, we accept the return of shares of Company common stock, at the current quoted market price, from employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

For share-based awards granted by the Company, the Operating Partnership issues a number of common units equal to the number of shares of common stock ultimately granted by the Company in respect of such awards.

Basic and Diluted Net Income Available to Common Stockholders per Share

Basic net income available to common stockholders per share is computed by dividing net income available to common stockholders after the allocation of income to participating securities, by the weighted-average number of shares of common stock outstanding for the period. Diluted net income available to common stockholders per share is computed by dividing net income available for common stockholders, after the allocation of income to participating securities, by the sum of the weighted-average number of shares of common stock outstanding for the period plus the assumed exercise of all dilutive securities. The impact of the outstanding common units is considered in the calculation of diluted net income available to common stockholders per share. The common units are not reflected in the diluted net income available to common stockholders per share calculation because the exchange of common units into common stock is on a one for one basis, and the common units are allocated net income on a per share basis equal to the common stock (See Note 19 “Net Income Available to Common Stockholders Per Share of the Company”). Accordingly, any exchange would not have any effect on diluted net income (loss) available to common stockholders per share.

Share-based payment awards (primarily vested restricted stock units (“RSUs”)) containing nonforfeitable rights to dividends or dividend equivalents are accounted for as participating securities and included in the computation of basic and diluted net income available to common stockholders per share pursuant to the two-class method. The dilutive effect of shares issuable under executed forward equity sale agreements, if any, are reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. The dilutive effect of the outstanding nonvested shares of common stock (“nonvested shares”) and RSUs that have not yet been vested but are contingently issuable under the share-based compensation programs is reflected in the weighted average diluted shares calculation by application of the treasury stock method.

Basic and Diluted Net Income Available to Common Unitholders per Unit

Basic net income available to common unitholders per unit is computed by dividing net income available to the general partner and common unitholders, after the allocation of income to participating securities, by the weighted-average number of vested common units outstanding for the period. Diluted net income available to common unitholders per unit is computed by dividing net income available to the general partner and common unitholders, after the allocation of income to participating securities, by the sum of the weighted-average number of common units outstanding for the period plus the assumed exercise of all dilutive securities.

The dilutive effect of outstanding nonvested shares, RSUs, awards containing nonforfeitable rights to dividend equivalents and shares issuable under executed forward equity sale agreements, if any, are reflected in diluted net income available to the general partner and common unitholders per unit in the same manner as noted above for net income available to common stockholders per share.

Fair Value Measurements

The marketable securities held in connection with our Deferred Compensation Plan are recorded at fair value on a recurring basis in our consolidated financial statements. All other financial instruments of the Company, with the exception of our secured and unsecured debt instruments which are disclosed in Note 18 “Fair Value Measurements and Disclosures” to our consolidated financial statements, are recorded at amounts which, in management’s judgment, reasonably approximate their fair values. We elected not to apply the fair value option for any of our eligible financial instruments or other items.

We determine the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy:

•Level 1 – quoted prices for identical instruments in active markets;

•Level 2 – quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and

•Level 3 – fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

We determine the fair value for the marketable securities using quoted prices in active markets for identical assets. Our other financial instruments, which are only disclosed at fair value, are comprised of certificates of deposit, secured debt, unsecured senior notes, unsecured revolving credit facility, and unsecured term loan facility.

We generally determine the fair value of our secured debt, unsecured senior notes, unsecured revolving credit facility, and unsecured term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. For our fixed-rate debt instruments, including our secured debt and unsecured senior notes, we calculate the market rate by obtaining period-end treasury rates for maturities that correspond to the maturities of our fixed-rate debt and then adding an appropriate credit spread based on information obtained from third-party financial institutions. These credit spreads take into account factors, including, but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan-to-value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flows. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period, if such prices are available. For our floating-rate debt instruments, including our unsecured line of credit agreement and unsecured term loan, we calculate the market rate by obtaining Adjusted SOFR and then adding an appropriate credit spread based on our credit ratings.

Income Taxes

We have elected to be taxed as a REIT under Sections 856 through 860 of the Code. To qualify as a REIT, we must distribute annually at least 90% of our adjusted taxable income, as defined in the Code, to our stockholders and satisfy certain other organizational and operating requirements. We generally will not be subject to federal income taxes if we distribute 100% of our taxable income for each year to our stockholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income taxes on our taxable income at regular corporate rates and we may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to federal income taxes and excise taxes on our undistributed taxable income. We believe that we have met all of the REIT distribution and

technical requirements for the years ended December 31, 2025, 2024, and 2023, and we were not subject to any federal income taxes (See Note 22 “Tax Treatment of Distributions” for additional information). We intend to continue to adhere to these requirements and maintain the Company’s REIT status. Accordingly, no provision for federal income taxes has been made in the accompanying financial statements.

In addition, any taxable income from our taxable REIT subsidiaries are subject to federal, state, and local income taxes. For the years ended December 31, 2025, 2024, and 2023 the taxable REIT subsidiaries had de minimis taxable income.

Uncertain Tax Positions

We include favorable tax positions in the calculation of tax liabilities if it is more likely than not that our adopted tax position will prevail if challenged by tax authorities.

We evaluated the potential impact of identified uncertain tax positions for all tax years still subject to audit under state and federal income tax law and concluded that we did not have any unrecognized tax benefits or any additional tax liabilities as of December 31, 2025 or 2024. As of December 31, 2025, the years still subject to audit are 2021 through 2025 under the California state income tax law, 2023 through 2025 under the Texas state income tax law and 2022 through 2025 under the federal income tax law.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates.

Segments

We currently operate as one reportable segment. See Note 23 “Segments” for additional information.

Concentration of Credit Risk

All of our business is currently conducted in the state of California, with the exception of the ownership and operation of ten stabilized office properties and one future development project located in the state of Washington, and one stabilized office property and one future development project located in Austin, Texas. The ability of tenants to honor the terms of their leases is dependent upon the economic, regulatory, and social factors affecting the communities in which our tenants operate.

We have deposited cash with financial institutions that is insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per institution. As of December 31, 2025 and 2024, we had cash accounts in excess of FDIC insured limits.

Recently Issued Accounting Pronouncements

Accounting Pronouncements Adopted January 1, 2025

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-09 “Income Taxes (Topic 740): Improvements to Tax Disclosures.” The ASU is effective for annual periods beginning after December 15, 2024. The guidance did not have a material impact on our consolidated financial statements or notes to our consolidated financial statements.

Accounting Pronouncements Effective 2026 and Beyond

In November 2024, the FASB issued ASU 2024-03 “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” The ASU is effective for annual periods beginning after December 15, 2026. The Company is currently evaluating whether the guidance will have a material impact on our consolidated financial statements or notes to our consolidated financial statements.

Acquisitions

12 Months Ended

Dec. 31, 2025

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Acquisitions

Operating Property Acquisitions

During the years ended December 31, 2025 and 2024, we acquired the operating properties listed below from unrelated third parties:


Property	Month of Acquisition	Number of Buildings	Rentable Square Feet (Unaudited)	Purchase Price (in millions) (1)
2025 Acquisitions
3530 & 3550 John Hopkins Court and 3535 & 3565 General Atomics Court (Nautilus)	December	4	232,166	$	192.0
335-345 N. Maple Drive (Maple Plaza)	September	1	306,366	205.3
Total 2025 Acquisitions		5	538,532	$	397.3

2024 Acquisitions
12707 & 12777 High Bluff Drive (One Paseo Junction)	September	2	103,731	$	35.0
Total 2024 Acquisitions		2	103,731	$	35.0

________________________

(1)Excludes closing costs and purchase price credits.

The related assets, liabilities, and results of operations of the acquired properties are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated relative fair values of the assets acquired and liabilities assumed as of the date of acquisition, net of credits, and excluding acquisition-related costs of $0.8 million:


	Total 2025 Operating Property Acquisitions		Total 2024 Operating Property Acquisitions
	(in thousands)
Assets
Land	$	50,382	$	6,000
Buildings and improvements	287,563		15,703
Deferred leasing costs and acquisition-related intangible assets (1)	61,454		13,534
Prepaid expenses and other assets, net	—		30
Total assets acquired	$	399,399	$	35,267
Liabilities
Acquisition-related intangible liabilities (2)	$	2,981	$	267
Total liabilities assumed	2,981		267
Net assets and liabilities acquired	$	396,418	$	35,000

________________________

(1)For the 2025 operating property acquisitions, represents in-place leases (approximately $46.6 million with a weighted average amortization period of 4.4 years), leasing commissions (approximately $7.9 million with a weighted average amortization period of 4.7 years), and above-market leases (approximately $7.0 million with a weighted average amortization period of 4.7 years). For the 2024 operating property acquisitions, represents in-place leases (approximately $10.5 million with a weighted average amortization period of 4.7 years), leasing commissions (approximately $2.0 million with a weighted average amortization period of 4.9 years), and an above-market lease (approximately $1.0 million with a weighted average amortization period of 4.6 years).

(2)For the 2025 operating property acquisitions, represents below-market leases (approximately $3.0 million with a weighted average amortization period of 3.3 years). For the 2024 operating property acquisitions, represents below-market leases (approximately $0.3 million with a weighted average amortization period of 4.9 years).

Acquisition Costs

During the years ended December 31, 2025 and 2024, we capitalized $0.8 million and $0.2 million of closing costs, respectively.

Dispositions and Real Estate Held For Sale

12 Months Ended

Dec. 31, 2025

Discontinued Operations and Disposal Groups [Abstract]

Dispositions and Real Estate Held For Sale

Operating Property Dispositions

We did not dispose of any operating properties during the years ended December 31, 2024 and 2023. The following table summarizes the operating properties sold during the year ended December 31, 2025:


Location	Month of Disposition	Number of Buildings	Rentable Square Feet (unaudited)	Sales Price (in millions) (1)
2025 Dispositions
501 Santa Monica Boulevard, Santa Monica, CA (2)	June	1	78,509	$	40.0
Silicon Valley Campus, CA (2)	September	4	663,460	365.0
6255 W. Sunset Boulevard, Los Angeles, CA (Sunset Media Center) (3)	December	1	325,772	61.0
Total 2025 Dispositions		6	1,067,741	$	466.0

____________________

(1)Represents gross sales price before broker commissions, closing costs, and purchase price credits.

(2)The total gains on the sales of the operating properties sold during the year ended December 31, 2025 was $127.0 million.

(3)During the three months and year ended December 31, 2025, we recognized an impairment charge of approximately $16.3 million to reduce the carrying amount of this property to its current fair value less closing costs.

Real Estate Assets Held for Sale

As of December 31, 2025, we classified a three-building office property, totaling 427,764 rentable square feet (unaudited), in the I-15 Corridor of San Diego as held for sale. The property was sold on January 23, 2026, for a gross sales price of $124.5 million, resulting in an estimated gain on sale of $8.2 million.

The major classes of assets and liabilities of the property classified as held for sale as of December 31, 2025 were as follows:


Real estate and other assets held for sale, net	(in thousands)
Land	$	23,158
Buildings and improvements	198,535
Total real estate assets held for sale	221,693
Accumulated depreciation and amortization	(116,693)
Total real estate assets held for sale, net	105,000
Current receivables, net	598
Deferred rent receivables, net	5,433
Deferred leasing costs and acquisition-related intangible assets, net	3,939
Prepaid expenses and other assets, net	185
Total real estate and other assets held for sale, net	$	115,155

Liabilities related to real estate assets held for sale
Accounts payable, accrued expenses, and other liabilities	$	663
Deferred revenue and acquisition-related intangible liabilities, net	1,882
Rents received in advance and tenant security deposits	2,400
Total liabilities related to real estate assets held for sale	$	4,945

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net

The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, and in-place leases) and acquisition-related intangible liabilities (acquired value of below-market operating leases):


	December 31, 2025		December 31, 2024
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:	(in thousands)
Deferred leasing costs	$	310,936	$	303,541
Accumulated amortization	(131,985)		(136,171)
Deferred leasing costs, net	178,951		167,370
Above-market operating leases	8,239		1,269
Accumulated amortization	(779)		(156)
Above-market operating leases, net	7,460		1,113
In-place leases	123,329		78,979
Accumulated amortization	(31,508)		(21,525)
In-place leases, net	91,821		57,454



Total deferred leasing costs and acquisition-related intangible assets, net	$	278,232	$	225,937
Acquisition-related Intangible Liabilities, net (1):
Below-market operating leases	$	41,292	$	38,413
Accumulated amortization	(14,613)		(10,995)
Below-market operating leases, net	26,679		27,418



Total acquisition-related intangible liabilities, net	$	26,679	$	27,418

____________________

(1)Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets. Refer to Note 9 “Deferred Revenue and Acquisition-Related Intangible Liabilities, net” for a detailed breakdown of this line item .

The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Deferred leasing costs	$	31,670	$	34,135	$	31,771
Above-market operating leases	645		86		31
In-place leases	12,122		7,453		15,878
Below-market operating leases	(3,724)		(3,607)		(6,679)
Total	$	40,713	$	38,067	$	41,001

The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2025 for future periods:


	Deferred Leasing Costs		Above-Market Operating Leases		In-Place Leases		Below-Market Operating Leases
Year Ending	(in thousands)
2026	$	32,410	$	1,809	$	21,138	$	(4,530)
2027	28,802		1,620		16,914		(4,075)
2028	26,406		1,520		14,792		(3,739)
2029	22,950		1,371		12,083		(2,976)
2030	19,717		893		8,487		(2,593)
Thereafter	48,666		247		18,407		(8,766)
Total	$	178,951	$	7,460	$	91,821	$	(26,679)

____________________

(1)Refer to Note 2 “Basis of Presentation and Significant Accounting Policies” for presentation in the consolidated statements of operations.

Prepaid Expenses and Other Assets, net

12 Months Ended

Dec. 31, 2025

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Prepaid Expenses and Other Assets, net

Prepaid expenses and other assets, net, consisted of the following:


	December 31, 2025		December 31, 2024
	(in thousands)
Furniture, fixtures, and other long-lived assets, net (1)	$	29,179	$	26,316
Prepaid expenses, net	11,000		8,470
Deferred financing costs, net (2)	9,150		12,692
Other assets	5,232		4,457

Total prepaid expenses and other assets, net	$	54,561	$	51,935

____________________

(1)Includes $43.4 million and $40.2 million of accumulated depreciation for furniture, fixtures, and other long-lived assets as of as of December 31, 2025 and 2024, respectively.

(2)Refer to Note 8 “Secured and Unsecured Debt of the Operating Partnership” for a discussion of the deferred financing costs for the unsecured revolving credit facility.

Secured and Unsecured Debt of the Company	12 Months Ended
Secured and Unsecured Debt of the Company	Dec. 31, 2025
Debt Disclosure [Abstract]
Secured and Unsecured Debt of the Company	Secured and Unsecured Debt of the Company In this Note 7, the “Company” refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership or its subsidiaries. The Company generally guarantees all of the Operating Partnership’s unsecured debt obligations, including the unsecured revolving credit facility, the unsecured term loan facility, and all of the unsecured senior notes. At December 31, 2025 and 2024, the Operating Partnership had $4.0 billion outstanding in total, including unamortized discounts and deferred financing costs, under these unsecured debt obligations. In addition, although the remaining $0.6 billion of the Operating Partnership’s debt as of December 31, 2025 and 2024 is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities. Debt Covenants and Restrictions One of the covenants contained within the unsecured revolving credit facility, as discussed further below in Note 8, prohibits the Company from paying dividends during an event of default in excess of an amount that results in distributions to us in an amount sufficient to permit us to pay dividends to our stockholders that we reasonably believe are necessary to (i) maintain our qualification as a REIT for federal and state income tax purposes, and (ii) avoid the payment of federal or state income or excise tax.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 1
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/470/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Section 50
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-Subparagraph (g)
-Publisher FASB
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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-Subparagraph (i)
-Publisher FASB
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Paragraph 1I
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

+ Details

Secured and Unsecured Debt of the Operating Partnership

12 Months Ended

Dec. 31, 2025

Debt Instrument [Line Items]

Secured and Unsecured Debt of the Operating Partnership

Secured and Unsecured Debt of the Company

In this Note 7, the “Company” refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership or its subsidiaries.

The Company generally guarantees all of the Operating Partnership’s unsecured debt obligations, including the unsecured revolving credit facility, the unsecured term loan facility, and all of the unsecured senior notes. At December 31, 2025 and 2024, the Operating Partnership had $4.0 billion outstanding in total, including unamortized discounts and deferred financing costs, under these unsecured debt obligations.

In addition, although the remaining $0.6 billion of the Operating Partnership’s debt as of December 31, 2025 and 2024 is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities.

Debt Covenants and Restrictions

One of the covenants contained within the unsecured revolving credit facility, as discussed further below in Note 8, prohibits the Company from paying dividends during an event of default in excess of an amount that results in distributions to us in an amount sufficient to permit us to pay dividends to our stockholders that we reasonably believe are necessary to (i) maintain our qualification as a REIT for federal and state income tax purposes, and (ii) avoid the payment of federal or state income or excise tax.

Kilroy Realty L.P.

Debt Instrument [Line Items]

Secured and Unsecured Debt of the Operating Partnership

Secured Debt

The following table sets forth the composition of our secured debt:


	Annual Stated Interest Rate (1)	GAAP Effective Rate (1) (2)	Maturity Date
				December 31, 2025		December 31, 2024
Type of Debt				(in thousands)
Mortgage note payable	3.57%	3.80%	December 2026	$	148,815	$	152,668
Mortgage note payable	4.48%	4.57%	July 2027	76,627		79,020
Mortgage note payable	5.90%	6.13%	August 2034	375,000		375,000
Total secured debt (3)				$	600,442	$	606,688
Unamortized deferred financing costs				(7,757)		(8,489)
Total secured debt, net				$	592,685	$	598,199

____________________

(1)All interest rates presented are fixed-rate interest rates.

(2)Represents the effective interest rate including the amortization of initial issuance discounts and deferred financing costs.

(3)The secured debt and the related properties that secure this debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

The Operating Partnership’s secured debt was collateralized by operating properties with a combined net book value of approximately $950.4 million as of December 31, 2025.

Although our secured debt is secured and non-recourse to the Company and the Operating Partnership, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities.

The mortgage notes payable are collateralized by deeds of trust on specific real estate assets owned by the Company, as well as by the assignment of certain rents and leases associated with those properties. These secured loans generally contain customary covenants and restrictions, including limitations on additional indebtedness and requirements to maintain the properties securing the loans.

Unsecured Debt

Issuance of $400.0 million Unsecured Senior Notes Due 2036

In January 2024, the Operating Partnership issued $400.0 million aggregate principal amount of unsecured senior notes in a registered public offering. The outstanding balance of the unsecured senior notes is included in unsecured debt, net of an initial issuance discount of $4.5 million, on our consolidated balance sheets. The unsecured senior notes, which are scheduled to mature on January 15, 2036, require semi-annual interest payments each January and July based on a stated annual interest rate of 6.250%. The Operating Partnership may redeem the notes at any time, either in whole or in part, subject to the payment of an early redemption premium with respect to redemptions prior to October 15, 2035. On or after October 15, 2035, the Operating Partnership may redeem the notes at any time, either in whole or in part, at par.

Repayment of $425.0 million Unsecured Senior Notes Due 2024

In December 2024, the Company repaid the aggregate remaining principal balance of $403.7 million of the Operating Partnership’s 3.450% $425.0 million unsecured senior notes due December 15, 2024.

Unsecured Senior Notes - Registered Public Offering and Repayment

In August 2025, the Operating Partnership issued $400.0 million aggregate principal amount of unsecured senior notes in a registered public offering. The outstanding balance of the unsecured senior notes is included in unsecured debt, net of an initial issuance discount of $4.0 million, on our consolidated balance sheets. The unsecured senior notes, which are scheduled to mature on October 15, 2035, require semi-annual interest payments each April and October based on a stated annual interest rate of 5.875%. The Operating Partnership may redeem the notes at any time, either in whole or in part, subject to the payment of an early redemption premium with respect to redemptions prior to July 15, 2035. On or after July 15, 2035, the Operating Partnership may redeem the notes at any time, either in whole or in part, at par. In September 2025, the Operating Partnership used the net proceeds from the issuance of the $400.0 million 5.875% unsecured senior notes to redeem the $400.0 million aggregate principal amount of our outstanding 4.375% unsecured senior notes due October 1, 2025.

The following table summarizes the balance and significant terms of the unsecured senior notes issued by the Operating Partnership and outstanding, including unamortized discounts and unamortized deferred financing costs:


	Maturity Date	Stated Coupon Rate	Effective Interest Rate (1) (2)	December 31, 2025		December 31, 2024
				(in thousands)
Private Placement Notes
Unsecured Senior Notes	July 2026	4.300%	4.389%	$	50,000	$	50,000
Unsecured Senior Notes	October 2026	4.350%	4.437%	200,000		200,000
Unsecured Senior Notes	February 2027	3.350%	3.416%	175,000		175,000
Unsecured Senior Notes	February 2029	3.450%	3.507%	75,000		75,000
Unsecured Senior Notes	January 2031	4.270%	4.322%	350,000		350,000
Public Notes
Unsecured Senior Notes	October 2025	4.375%	4.444%	—		400,000
Unsecured Senior Notes	December 2028	4.750%	4.874%	400,000		400,000
Unsecured Senior Notes	August 2029	4.250%	4.383%	400,000		400,000
Unsecured Senior Notes	February 2030	3.050%	3.168%	500,000		500,000
Unsecured Senior Notes	November 2032	2.500%	2.626%	425,000		425,000
Unsecured Senior Notes	November 2033	2.650%	2.727%	450,000		450,000
Unsecured Senior Notes	October 2035	5.875%	6.076%	400,000		—
Unsecured Senior Notes	January 2036	6.250%	6.412%	400,000		400,000
Total Unsecured Senior Notes				$	3,825,000	$	3,825,000
Less: Unamortized Net Discounts and Deferred Financing costs				(27,949)		(24,205)
Total Unsecured Senior Notes, Net (3)				$	3,797,051	$	3,800,795

____________________

(1)Represents the effective interest rate including the amortization of initial issuance discounts and deferred financing costs.

(2)Interest on unsecured senior notes is payable semi-annually.

(3)Includes unamortized discounts of $11.0 million and $8.4 million and unamortized deferred financing costs of $16.9 million and $15.8 million as of December 31, 2025 and December 31, 2024, respectively.

Unsecured Revolving Credit Facility and Term Loan Facility

In March 2024, the Operating Partnership amended and restated the terms of its unsecured revolving credit facility. The amendment and restatement maintained the $1.1 billion borrowing capacity and extended the maturity date of the unsecured revolving credit facility to July 31, 2028.

The following table summarizes the balance and terms of our unsecured revolving credit facility:


	Unsecured Revolving Credit Facility
	December 31, 2025			December 31, 2024
	($ in thousands)
Outstanding borrowings	$	—		$	—
Remaining borrowing capacity (1)	1,100,000			1,100,000
Total borrowing capacity (1)	$	1,100,000		$	1,100,000
Interest rate (2)	5.07		%	5.69		%
Annual facility fee (3)	0.250%
Unamortized deferred financing costs (3)	$	9,150		$	12,692
Maturity date (4)	July 31, 2028

____________________

(1)Remaining and total borrowing capacity are further reduced by the amount of our outstanding letters of credit which total approximately $5.2 million as of December 31, 2025 and December 31, 2024. We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $500.0 million under an accordion feature pursuant to the terms of the unsecured revolving credit facility.

(2)Our unsecured revolving credit facility interest rate was calculated using the Secured Overnight Financing Rate (“SOFR”) plus a SOFR adjustment of 0.10% (together “Adjusted SOFR”) and a margin of 1.100% based on our credit rating as of December 31, 2025 and 2024. We may be entitled to a temporary 0.01% reduction in the interest rate provided we meet certain sustainability goals with respect to the ongoing reduction of greenhouse gas emissions.

(3)Our annual facility fee is paid on a quarterly basis and is calculated based on total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs in connection with the amendment and restatement of the unsecured revolving credit facility in 2024. These costs are included in Prepaid expenses and other assets, net on our consolidated balance sheets, and will continue to be amortized through the maturity date of our unsecured revolving credit facility.

(4)The maturity date may be extended by two six-month periods, at the Operating Partnership’s election.

The Operating Partnership intends to borrow under the unsecured revolving credit facility from time to time for general corporate purposes, including, to finance development and redevelopment expenditures, to fund potential acquisitions, to repay long-term debt, and to supplement cash balances in response to market conditions.

In connection with amending and restating the unsecured revolving credit facility in 2024, the Operating Partnership also amended its $520.0 million unsecured term loan facility (the “2022 Term Loan Facility”). In doing so, the Operating Partnership repaid $200.0 million and extended the maturity date on $200.0 million of the principal balance by 12 months to October 3, 2025 (the “2024 Term Loan Facility”). In September 2024, the Operating Partnership repaid the remaining $120.0 million outstanding on its 2022 Term Loan Facility. In September 2025, the Operating Partnership exercised the loan extension option on the 2024 Term Loan Facility, extending the maturity date by 12 months to October 3, 2026.

The following table summarizes the balance and terms of our 2024 Term Loan Facility:


	2024 Term Loan Facility
	December 31, 2025			December 31, 2024
	($ in thousands)
Outstanding borrowings (1)	$	200,000		$	200,000
Interest rate (2)	5.02		%	5.70		%
Unamortized deferred financing costs (3)	$	277		$	1,229
Maturity date (4)	October 3, 2026			October 3, 2025

____________________

(1)We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $130.0 million, under an accordion feature pursuant to the terms of the 2024 Term Loan Facility, as of December 31, 2025.

(2)Our 2024 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 1.200% based on our credit rating as of December 31, 2025 and 2024.

(3)We incurred debt origination and legal costs in connection with the amendment and restatement of the 2024 Term Loan Facility in 2024, which remain to be amortized through the maturity date. Additionally, in connection with extending the maturity date in September 2025, we incurred additional costs which will continue to be amortized through the extended maturity date of the 2024 Term Loan Facility.

(4)During the year ended December 31, 2025, we exercised our option to extend the maturity date by 12 months to October 3, 2026. The maturity date may be extended by an additional 12-month period, at the Operating Partnership’s election.

Financial Covenants and Restrictions

The unsecured revolving credit facility, unsecured term loan facility, unsecured senior notes, including the private placement notes, and certain other secured debt arrangements contain covenants and restrictions requiring us to meet certain financial ratios and reporting requirements. Some of the more restrictive financial covenants include a maximum ratio of total debt to total asset value, a minimum fixed-charge coverage ratio, a maximum ratio of secured debt to total asset value, a minimum unsecured debt ratio, and a minimum unencumbered asset pool debt service coverage ratio. Noncompliance with one or more of the covenants and restrictions could result in the full principal balance of the associated debt becoming immediately due and payable. We were in compliance with all of our financial covenants as of December 31, 2025 and 2024.

Debt Maturities

The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of December 31, 2025:


Year	(in thousands)
2026	$	601,317
2027	249,125
2028	400,000
2029	475,000
2030	500,000
Thereafter	2,400,000
Total aggregate principal value	$	4,625,442
Less: unamortized net discounts and deferred financing costs (1)	(35,983)
Total debt, net	$	4,589,459

________________________

(1) Includes $25.0 million of unamortized deferred financing costs for the unsecured term loan facility, unsecured senior notes, and secured debt, and $11.0 million of unamortized discounts for the unsecured senior notes. Excludes unamortized deferred financing costs on the unsecured revolving credit facility, which are included in Prepaid expenses and other assets, net on our consolidated balance sheets.

Capitalized Interest

The following table sets forth our gross interest expense and capitalized interest. The interest expense capitalized was recorded as a cost of development and redevelopment and increased the carrying value of undeveloped land and construction in progress currently under construction:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Gross interest expense	$	211,379	$	227,748	$	192,983
Capitalized interest	(85,087)		(82,461)		(78,767)
Interest expense	$	126,292	$	145,287	$	114,216

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Deferred Revenue and Acquisition-Related Intangible Liabilities, net

12 Months Ended

Dec. 31, 2025

Revenue from Contract with Customer [Abstract]

Deferred Revenue and Acquisition-Related Intangible Liabilities, net

Deferred revenue and acquisition-related intangible liabilities, net consisted of the following:


	December 31, 2025		December 31, 2024
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements, net	$	70,813	$	81,738
Other deferred revenue, net (1)	28,136		33,281
Acquisition-related intangible liabilities, net (2)	26,679		27,418
Total	$	125,628	$	142,437

_____________________

(1)Represents cash received in advance of revenue recognition, net of accumulated amortization.

(2)See Note 5 “Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net” for additional information regarding our acquisition-related intangible liabilities.

Deferred Revenue Related to Tenant-funded Tenant Improvements

During the years ended December 31, 2025, 2024, and 2023, $14.6 million, $19.1 million, and $20.7 million, respectively, of deferred revenue related to tenant-funded tenant improvements was amortized and recognized as rental income. The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2025 for the next five years and thereafter:


Year Ending	(in thousands)
2026	$	12,933
2027	11,619
2028	10,457
2029	9,726
2030	9,037
Thereafter	17,041
Total	$	70,813

Noncontrolling Interests on the Company’s Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2025
Noncontrolling Interest [Abstract]
Noncontrolling Interests on the Company’s Consolidated Financial Statements	Noncontrolling Interests on the Company’s Consolidated Financial Statements Common Units of the Operating Partnership The Company owned an approximate 99.1% and 99.0% common general partnership interest in the Operating Partnership as of December 31, 2025 and 2024, respectively. The remaining approximate 0.9% and 1.0% common limited partnership interest as of December 31, 2025 and 2024, respectively, was owned by non-affiliated investors in the form of noncontrolling common units. There were 1,133,562 and 1,150,574 common units outstanding held by these investors as of December 31, 2025 and 2024, respectively. The noncontrolling common units may be redeemed by unitholders for cash. Except under certain circumstances, we, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. If satisfied in cash, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $0.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable redemption date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $43.2 million and $46.8 million as of December 31, 2025 and 2024, respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is generally expected that each common unit would be entitled to a liquidating distribution equal to the liquidating distribution payable in respect of each share of the Company’s common stock. Noncontrolling Interest in Consolidated Property Partnerships Refer to Note 11 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements” for additional information regarding these consolidated property partnerships.

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2025
Noncontrolling Interest [Line Items]
Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	Noncontrolling Interests on the Company’s Consolidated Financial Statements Common Units of the Operating Partnership The Company owned an approximate 99.1% and 99.0% common general partnership interest in the Operating Partnership as of December 31, 2025 and 2024, respectively. The remaining approximate 0.9% and 1.0% common limited partnership interest as of December 31, 2025 and 2024, respectively, was owned by non-affiliated investors in the form of noncontrolling common units. There were 1,133,562 and 1,150,574 common units outstanding held by these investors as of December 31, 2025 and 2024, respectively. The noncontrolling common units may be redeemed by unitholders for cash. Except under certain circumstances, we, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. If satisfied in cash, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $0.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable redemption date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $43.2 million and $46.8 million as of December 31, 2025 and 2024, respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is generally expected that each common unit would be entitled to a liquidating distribution equal to the liquidating distribution payable in respect of each share of the Company’s common stock. Noncontrolling Interest in Consolidated Property Partnerships Refer to Note 11 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements” for additional information regarding these consolidated property partnerships.
Kilroy Realty L.P.
Noncontrolling Interest [Line Items]
Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements Consolidated Property Partnerships The noncontrolling equity interests in 100 First LLC and 303 Second LLC as of December 31, 2025 and 2024 were $160.3 million and $169.4 million, respectively. The remaining amount of noncontrolling equity interests in consolidated property partnerships represents the third party equity interests in Redwood LLC. This noncontrolling equity interest was $4.7 million and $4.9 million as of December 31, 2025 and 2024, respectively.

Stockholders' Equity of the Company

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Stockholders' Equity of the Company

Stockholders’ Equity of the Company

Common Stock

At-The-Market Stock Offering Program

Under our at-the-market (“ATM”) stock offering program (the “2024 ATM Program”), which commenced in March 2024, we may offer and sell shares of our common stock having an aggregate gross sales price up to $500.0 million from time to time in “at-the-market” offerings. In connection with the 2024 ATM Program, the Company may also, at its discretion, enter into forward equity sale agreements. The use of forward equity sale agreements allows the Company to lock in a share price on the sale of shares of our common stock at the time an agreement is executed, but defer settling the forward equity sale agreements and receiving the proceeds from the sale of shares until a later date. The Company did not have any outstanding forward equity sale agreements to be settled at December 31, 2025. Since commencement of the 2024 ATM Program, we have not completed any sales of common stock.

Share Repurchase Program

Under our current share repurchase program, which commenced in February 2024 (the “Share Repurchase Program”), we are authorized to repurchase shares of the Company’s common stock having an aggregate gross purchase price of up to $500.0 million. Under the Share Repurchase Program, repurchases may be made from time to time using a variety of methods, which may include open market purchases and privately negotiated transactions. The specific timing, price, and size of purchases will depend on prevailing stock prices, general economic and market conditions, and other considerations. The Share Repurchase Program does not have a termination date and repurchases may be discontinued at any time. As of December 31, 2025, the Share Repurchase Program had $500.0 million of available repurchase capacity. Since commencement of the Share Repurchase Program, we have not completed any common stock repurchases and did not repurchase any common stock under the previous share repurchase program approved by the Company’s Board of Directors in 2016 during the year ended December 31, 2023.

Accrued Dividends and Distributions

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock and noncontrolling units:


	December 31, 2025		December 31, 2024
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	63,921	$	63,745
Noncontrolling common unitholders of the Operating Partnership	612		621
RSU holders (1)	476		484
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	$	65,009	$	64,850

_____________________

(1)The amount includes the value of the dividend equivalents that will be paid with additional RSUs (See Note 14 “Share-Based and Other Compensation” for additional information).


	December 31, 2025	December 31, 2024
Outstanding Shares and Units:
Common stock	118,372,451	118,046,674
Noncontrolling common units	1,133,562	1,150,574
RSUs (1)	846,072	861,385

_____________________

(1)The amount includes nonvested RSUs. Does not include 1,394,111 and 926,695 performance-based RSUs because not all the necessary performance conditions have been met as of December 31, 2025 and 2024, respectively. Refer to Note 14 “Share-Based and Other Compensation” for additional information.

- Definition

The entire disclosure for equity.

+ References

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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-16

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

+ Details

Partners' Capital of the Operating Partnership

12 Months Ended

Dec. 31, 2025

Partners' Capital [Abstract]

Partners' Capital of the Operating Partnership

Partners’ Capital of the Operating Partnership

Common Units

Common Units Outstanding

The following table sets forth the number of common units held by the Company as the general partner and the number of common units held by non-affiliated investors in the form of common limited partner units as well as the ownership interest held on each respective date:


	December 31, 2025		December 31, 2024
Company owned common units in the Operating Partnership	118,372,451		118,046,674
Company owned general partnership interest	99.1	%	99.0	%
Non-affiliated investors and other common units of the Operating Partnership	1,133,562		1,150,574
Ownership interest of limited partnership interests	0.9	%	1.0	%

For a further discussion of the redemption features of the common units not owned by the Company as of December 31, 2025 and 2024, refer to Note 10 “Noncontrolling Interests on the Company’s Consolidated Financial Statements.”

Accrued Distributions

The following tables summarize accrued distributions for the noted common units:


	December 31, 2025		December 31, 2024
	(in thousands)
Distributions payable to:
General partner	$	63,921	$	63,745
Common limited partners	612		621
RSU holders (1)	476		484
Total accrued distributions to common unitholders	$	65,009	$	64,850

_____________________

(1)The amount includes the value of the dividend equivalents that will be paid with additional RSUs (See Note 14 “Share-Based and Other Compensation” for additional information).


	December 31, 2025	December 31, 2024
Outstanding Units:
Common units held by the general partner	118,372,451	118,046,674
Common units held by the limited partners	1,133,562	1,150,574
RSUs (1)	846,072	861,385

_____________________

(1)Does not include 1,394,111 and 926,695 performance-based RSUs because not all the necessary performance conditions have been met as of December 31, 2025 and 2024, respectively. Refer to Note 14 “Share-Based and Other Compensation” for additional information.

Share-Based and Other Compensation

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Share-Based and Other Compensation

Share-Based Incentive Compensation Plan

As of December 31, 2025, we maintained one share-based incentive compensation plan, the Kilroy Realty 2006 Incentive Award Plan, as amended (the “2006 Plan”). The Company has a currently effective registration statement registering 12.6 million shares of our common stock for possible issuance under our 2006 Plan. As of December 31, 2025, approximately 1.8 million shares were available for grant under the 2006 Plan. The calculation of shares available for grant is presented after taking into account a reserve to cover the vesting and payment of 2006 Plan awards that were outstanding on that date, including performance-based vesting awards at (i) levels actually achieved for the performance conditions (as defined below) for which the performance period has been completed, and (ii) at maximum levels for the performance conditions (as defined below) for which the performance period has not been completed.

The Executive Compensation Committee of the Company’s Board of Directors (the “Executive Compensation Committee”) may grant the following share-based awards to eligible individuals, as provided under the 2006 Plan: incentive stock options, nonqualified stock options, restricted stock (nonvested shares), stock appreciation rights, performance shares, performance stock units, dividend equivalents, stock payments, deferred stock, restricted stock units, profit interest units, performance bonus awards, performance-based awards, and other incentive awards. For each award granted under our share-based incentive compensation programs, the Operating Partnership simultaneously issues to the Company a number of common units equal to the number of shares of common stock ultimately paid by the Company in respect of such awards. The Executive Compensation Committee generally grants RSU awards to certain officers of the Company under the 2006 Plan annually in the first quarter. A portion of these awards are subject to service and/or performance vesting conditions (“Performance-Based RSUs”) and the remainder are subject to only service vesting conditions (“Time-Based RSUs”).

2025, 2024, and 2023 Annual Performance-Based RSU Grants

During each of the three years in the period ended December 31, 2025, the Executive Compensation Committee granted Performance-Based RSUs to certain officers of the Company under the 2006 Plan. The Performance-Based RSUs have a three-year performance measurement period. A target number of Performance-Based RSUs were awarded, and the final number of Performance-Based RSUs that vest (which may be more or less than the target number) will be based upon (i) during the first calendar year of the respective awards’ three-year performance measurement period, the achievement of a pre-set FFO per share goal that applies to 100% of the Performance-Based RSUs awarded (the “FFO Performance Condition”), and (ii) a performance measure that applies to 50% of the award based upon the Company’s average net debt to EBITDAre ratio for the three year performance period (the “Net Debt to EBITDAre Ratio Performance Condition”), and a market measure that applies to the other 50% of the award based upon the relative ranking of the Company’s total stockholder return for the three year performance period compared to the total stockholder returns of an established comparison group of companies over the same period (the “TSR Condition”). The Performance-Based RSUs are also subject to a three-year service vesting provision (the “Service Vesting Condition”) and are scheduled to cliff vest on the date the final vesting percentage is determined following the end of the three-year performance measurement period under the awards. The number of Performance-Based RSUs ultimately earned could fluctuate from the target number of Performance-Based RSUs granted based upon the levels of achievement for the above performance conditions. The estimate of the number of Performance-Based RSUs earned is evaluated quarterly during the performance period based on our estimate for each of the performance conditions relative to the applicable goals. Compensation expense for the Performance-Based RSU grants is recognized on a straight-line basis over the requisite service period for each participant, which is generally the three-year service period.

Each Performance-Based RSU represents the right to receive one share of our common stock in the future, subject to, and as modified by, the Company’s level of achievement of the applicable performance conditions. The fair values for the awards subject to the TSR Condition were calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below. The determination of the fair values of the Performance-Based RSUs take into consideration the likelihood of achievement of the TSR Condition and the share price on the grant date. The following table summarizes the estimated number of RSUs earned for the 2025 and 2024 Performance-

Based RSUs and the actual number of RSUs earned for the 2023 Performance-Based RSUs and the assumptions utilized in the Monte Carlo simulation pricing models:


	2025		2024		2023
Service vesting period	February 14, 2025 - January, 2028		February 1, 2024 - January, 2027		February 6, 2023 - January, 2026
Performance measurement period	January 1, 2025 - December 31, 2027		January 1, 2024 - December 31, 2026		January 1, 2023 - December 31, 2025
Target RSUs granted	308,671		265,205		300,007
Estimated RSUs earned net of forfeitures (1)	472,942		474,214		729,890
Fair Value Assumptions:
Valuation date	February 14, 2025		February 1, 2024		February 6, 2023
Fair value on valuation date (in millions)	$11.3		$9.5		$12.0
Weighted average fair value per share	$36.49		$35.66		$39.95
Expected share price volatility	38.0	%	34.0	%	35.0	%
Risk-free interest rate	4.35	%	3.98	%	4.12	%

_____________________

(1)Estimated RSUs earned for the 2025 and 2024 Performance-Based RSUs are based on the actual achievement of the applicable FFO Performance Condition and estimated achievement of the Net Debt to EBITDA Ratio Performance Condition and the TSR Condition. The 2023 Performance-Based RSUs earned are based on actual achievement of the FFO Performance Condition, the Net Debt to EBITDA Ratio Performance Condition, and the TSR Condition upon completion of the performance measurement period at December 31, 2025.

Summary of Performance-Based RSUs

A summary of our Performance-Based RSUs activity from January 1, 2025 through December 31, 2025 is presented below:


	Nonvested RSUs			Vested RSUs	Total RSUs
	Amount	Weighted-Average Grant-Date Fair Value Per Share
Outstanding at January 1, 2025 (1)	926,695	$	42.26	81,274	1,007,969
Granted	308,671	36.49		—	308,671
Performance award achievement adjustment (2)	294,387	36.51		—	294,387
Vested	(183,474)	62.93		183,474	—
Settled	—	—		(137,016)	(137,016)
Issuance of dividend equivalents (3)	91,948	35.87		7,352	99,300
Forfeited	(44,116)	37.24		—	(44,116)
Outstanding as of December 31, 2025 (4)	1,394,111	$	37.11	135,084	1,529,195

____________________

(1)Effective 2025, management updated the presentation of the opening balance to reflect the performance adjustment related to Net Debt to EBITDA Ratio Performance Condition and the TSR Condition.

(2)Represents performance adjustments above target based on the actual achievement for 2023 awards and estimated achievement for 2024 and 2025 awards.

(3)Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreements.

(4)Outstanding nonvested RSUs as of December 31, 2025 represent the actual achievement of the 2023 Performance-Based RSUs and the estimated achievement of 2024 and 2025 Performance-Based RSUs as of December 31, 2025. Dividend equivalents earned will vest along with the underlying award and are also subject to changes based on the number of RSUs ultimately earned for each underlying award.

A summary of our Performance-Based RSUs activity for the years ended December 31, 2025, 2024, and 2023 is presented below:


	RSUs Granted			RSUs Vested
Years ended December 31,	Non-Vested RSUs Granted	Weighted-Average Fair Value Per Share		Vested RSUs	Total Vest-Date Fair Value (in thousands)
2025	308,671	$	36.49	190,826	$	7,016
2024	265,205	$	35.66	1,089,879	$	38,364
2023	300,007	$	39.95	290,570	$	11,105

2025, 2024, and 2023 Time-Based RSU Grants

During each of the three years in the period ended December 31, 2025, the Executive Compensation Committee granted Time-Based RSUs to certain officers of the Company under the 2006 Plan. The Time-Based RSUs are generally scheduled to vest in three equal annual installments. Compensation expense for the Time-Based RSUs is recognized on a straight-line basis over the requisite service period, which is generally the explicit service period. Each Time-Based RSU represents the right to receive one share of our common stock in the future, subject to continued employment through the applicable vesting date.

Summary of Time-Based RSUs

A summary of our Time-Based RSUs activity from January 1, 2025 through December 31, 2025 is presented below:


	Nonvested RSUs			Vested RSUs	Total RSUs
	Amount	Weighted Average Grant-Date Fair Value Per Share
Outstanding at January 1, 2025	537,426	$	36.37	242,685	780,111
Granted	258,356	34.66		—	258,356
Vested	(313,893)	40.85		313,893	—
Settled	—	—		(347,900)	(347,900)
Issuance of dividend equivalents (1)	27,154	35.87		18,668	45,822

Forfeited	(25,401)	35.81		—	(25,401)

Outstanding as of December 31, 2025	483,642	$	35.37	227,346	710,988

____________________

(1)Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreements.

A summary of our Time-Based RSUs activity for the years ended December 31, 2025, 2024, and 2023 is presented below:


	RSUs Granted			RSUs Vested
Year ended December 31,	Non-Vested RSUs Issued	Weighted-Average Grant Date Fair Value Per Share		Vested RSUs	Total Vest-Date Fair Value (1) (in thousands)
2025	258,356	$	34.66	332,561	$	12,236
2024	385,718	$	36.12	281,168	$	10,878
2023	247,017	$	38.12	343,334	$	12,425

____________________

(1) Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company’s common stock on the NYSE on the day of vesting. Excludes the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement.

Share-Based Compensation Cost

The total compensation cost for all share-based compensation programs was $24.0 million, $24.4 million, and $43.7 million for the years ended December 31, 2025, 2024, and 2023, respectively. Share-based compensation costs for the year ended December 31, 2023 includes $27.3 million of accelerated share-based compensation costs for our former CEO and former President. Of the total share-based compensation costs, $4.9 million, $6.8 million, and $6.9 million was capitalized as part of real estate assets for the years ended December 31, 2025, 2024, and 2023, respectively. As of December 31, 2025, there was approximately $26.5 million of total unrecognized compensation cost related to nonvested incentive awards granted under share-based compensation arrangements and outstanding as of December 31, 2025. Such amount is based in part upon the estimated future outcome of the performance metrics as of December 31, 2025, and the actual compensation cost ultimately recognized could increase or decrease from this estimate based upon actual performance results. These costs are expected to be recognized over a weighted-average period of 1.7 years.

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2025
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Plan We have a retirement savings plan designed to qualify under Section 401(k) of the Code (the “401(k) Plan”). Our employees are eligible to participate in the 401(k) Plan on the first day of the month after the date of hire. The 401(k) Plan allows eligible employees (“401(k) Participants”) to defer up to 60% of their eligible compensation on a pre-tax basis, subject to certain maximum amounts allowed by the Code. The 401(k) Plan provides for a matching contribution by the Company in an amount equal to 50 cents of each one dollar of participant contributions up to a maximum of 10% of the 401(k) Participant’s annual salary. 401(k) Participants vest immediately in the amounts contributed by us. For each of the years ended December 31, 2025, 2024, and 2023, we contributed $1.7 million, $1.8 million, and $1.7 million, respectively, to the 401(k) Plan. Deferred Compensation Plan In 2007, we adopted the Deferred Compensation Plan, under which directors and certain management employees may defer receipt of their compensation, including up to 70% of their salaries and up to 100% of their director fees and bonuses, as applicable. In addition, certain employee participants received mandatory Company contributions to their Deferred Compensation Plan accounts equal to 10% of their gross monthly salaries, without regard to whether such employees elect to defer salary or bonus compensation under the Deferred Compensation Plan. Our Board may, but has no obligation to, approve additional discretionary contributions by the Company to Participant accounts. We hold the Deferred Compensation Plan assets in a limited rabbi trust, which is subject to the claims of our creditors in the event of bankruptcy or insolvency. See Note 18 “Fair Value Measurements and Disclosures” for further discussion of our Deferred Compensation Plan assets as of December 31, 2025 and 2024. Our liability of $30.2 million and $27.4 million under the Deferred Compensation Plan was fully funded as of December 31, 2025 and 2024, respectively.

Rental Income and Future Minimum Rent

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Rental Income and Future Minimum Rent

The table below sets forth the allocation of rental income between fixed and variable lease payments and net collectability considerations:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Fixed lease payments	$	900,285	$	923,029	$	944,618
Variable lease payments	194,374		197,502		184,672
Impact from tenant creditworthiness considerations (1)	(1,072)		(2,416)		(11,553)
Total rental income	$	1,093,587	$	1,118,115	$	1,117,737

____________________

(1)Represents reversal/reserve adjustments to rental income related to our assessment of the collectability of amounts due under leases with our tenants, including recognition of deferred rent balances associated with tenants moved to / restored from a cash basis of revenue recognition and allowances for uncollectible receivables.

We have operating leases with tenants that expire at various dates through 2050 and may be subject to scheduled fixed increases and future renewal options. Leases may also provide for reimbursements of certain property-related operating expenses. Future contractual minimum rent under operating leases, which includes amounts contractually due from leases that are on a cash basis of reporting due to creditworthiness considerations, as of December 31, 2025 for future periods is summarized as follows:


Year Ending	(in thousands)
2026	$	769,406
2027	769,403
2028	742,321
2029	666,034
2030	583,844
Thereafter	1,591,508
Total (1)	$	5,122,516

____________________

(1)Excludes residential leases, leases at properties classified as held for sale, and leases with an initial term of one year or less.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Development and Construction Commitments

As of December 31, 2025, we had commitments of approximately $283.9 million, excluding our ground lease commitments, for contracts and executed leases directly related to our operating and development and redevelopment properties.

Ground Leases

The following table summarizes our properties that are held subject to long-term non-cancellable ground lease obligations as of December 31, 2025 and the respective contractual expiration dates:


Property (1)			Contractual Expiration Date
701, 801, and 837 N. 34th Street, Seattle, WA (2)			December 2041
1701 Page Mill Road and 3150 Porter Drive, Palo Alto, CA			December 2067
Kilroy Airport Center Phases I, II, and III, Long Beach, CA (3)			July 2084
3243 S. La Cienega Boulevard, Los Angeles, CA			October 2106
200 W. 6th Street, Austin, TX			December 2112

____________________

(1) Excludes one month-to-month ground lease.

(2) The Company has three 10-year and one 45-year extension options for this ground lease, which if exercised would extend the expiration date to December 2116. These extension options are not assumed to be exercised in our calculation of the present value of the future minimum lease payments for this lease. The Company also has a purchase option for this ground lease.

(3) Assumes the impact of all extension options held by the Company.

To determine the discount rates used to calculate the present value of the minimum future lease payments for our ground leases, we used a hypothetical curve derived from unsecured corporate borrowing rates over the lease term. The weighted average discount rate used to determine the present value of our minimum lease payments was 4.67%. As of December 31, 2025, the weighted average remaining lease term of our ground leases is 62 years. For the years ended December 31, 2025, 2024, and 2023, variable lease costs totaling $5.0 million, $4.7 million, and $4.0 million, respectively, were recorded to ground leases expense on our consolidated statements of operations.

The minimum commitment under our ground leases as of December 31, 2025 for future periods is as follows:


Year Ending	(in thousands)
2026	$	6,809
2027	6,850
2028	6,869
2029	6,869
2030	6,869
Thereafter	360,875
Total undiscounted cash flows (1) (2) (3) (4) (5) (6)	$	395,141
Present value discount	(267,513)
Ground lease liabilities	$	127,628

________________________

(1)Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum obligations under the ground leases including any extension options (but excluding the Seattle ground lease extension options).

(2) Our 701, 801, and 837 N. 34th Street ground lease obligation is subject to a fair market value adjustment every five years based on CPI adjustments and every 15 years based on third-party appraisals. The contractual obligations for that ground lease included above assume the current annual ground lease obligation in effect at December 31, 2025 for the remainder of the lease term, as we cannot predict future adjustments.

(3) Our 1701 Page Mill Road and 3150 Porter Drive ground lease obligation includes a component that is based on the percentage of adjusted gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every 10 years by an amount equal to 60% of the average annual percentage rent for the previous three years. The contractual obligations for this lease included above assume the current annual ground lease obligation in effect at December 31, 2025 for the remainder of the lease term, as we cannot predict future adjustments.

(4) Our Kilroy Airport Center Phases I, II, and III ground lease obligation is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals with predetermined maximum annual increases. The contractual obligations for that ground lease included above assume the contractual minimum annual rent prior to the consideration of any variable rental payments in effect at December 31, 2025 for the remainder of the lease term, as we cannot predict future adjustments.

(5) Our 3243 S. La Cienega Boulevard ground lease obligation is subject to fixed 5% ground rent increases every five years, with the next increase occurring on November 1, 2027.

(6) Our 200 W. 6th Street ground lease obligation is subject to fixed 2% annual ground rent increases, with resets occurring every ten years based on CPI. The contractual obligations for that ground lease included above assume increases for the remaining current ten-year period based on the contractual minimum annual rent prior to the consideration of any variable rental payments (1.5% of gross income) in effect at December 31, 2025.

Environmental Matters

We follow the policy of evaluating all of our properties, including acquisitions, developments and redevelopments, and existing stabilized properties, for the presence of hazardous or toxic substances. While there can be no assurance that a material environmental liability does not exist, we are not currently aware of any undisclosed environmental liability with respect to our stabilized portfolio properties that would have a material adverse effect on our financial condition, results of operations, and cash flows, or that we believe would require additional disclosure or the recording of a loss contingency.

We had the following accrued environmental remediation liabilities in connection with certain of our in-process and future development projects:


	December 31, 2025		December 31, 2024
	(in thousands)
Environmental liabilities	$	70,030	$	72,003

The accrued environmental remediation liabilities represent the remaining costs we estimate we will incur prior to and during the development process at various development sites. These estimates, which we developed with the assistance of third-party experts, consist primarily of the removal of contaminated soil, treatment of contaminated groundwater in connection with dewatering efforts, performance of environmental closure activities, construction of remedial systems, and other related costs that are necessary when we develop new buildings at these sites.

We record estimated environmental remediation obligations for acquired properties at the acquisition date when we are aware of such costs and when such costs are probable of being incurred and can be reasonably estimated. Estimated costs related to development environmental remediation liabilities are recorded as an increase to the cost of the development project. Actual costs are recorded as a decrease to the liability when incurred. These accruals are adjusted as an increase or decrease to the development project costs and as an increase or decrease to the accrued environmental remediation liability if we obtain further information or circumstances change. The environmental remediation obligations recorded at December 31, 2025 and 2024 were not discounted to their present values since the amount and timing of cash payments are not fixed. It is possible that we could incur additional environmental remediation costs in connection with these development projects. However, potential additional environmental costs for these development projects cannot be reasonably estimated at this time and certain changes in estimates could occur as the site conditions, final project timing, design elements, actual soil conditions, and other aspects of the projects, which may depend upon municipal and other approvals beyond the control of the Company, are determined.

Other than the accrued environmental liabilities discussed above, we are not aware of any unasserted claims and assessments with respect to an environmental liability or an asset retirement obligation that we believe would require additional disclosure or the recording of an additional loss contingency.

Litigation

We and our properties are subject to litigation arising in the ordinary course of business. To our knowledge, neither we nor any of our properties are presently subject to any litigation or threat of litigation which, if determined unfavorably to us, would have a material adverse effect on our cash flows, financial condition, or results of operations.

Insurance

We maintain comprehensive insurance coverage for our real estate portfolio, including commercial general liability, property, environmental, rental income, and specialty risk policies covering all properties. Management believes the policy specifications and insured limits are reasonable given the relative risk of loss, the cost of the coverage, and industry practice. We do not carry insurance for generally uninsurable losses such as loss from

governmental action, nuclear hazard, and war and military action. Policies are subject to various terms, conditions, and exclusions and some policies may involve large deductibles or co-payments.

Fair Value Measurements and Disclosures

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Fair Value Measurements and Disclosures

The only assets we record at fair value on a recurring basis in our consolidated financial statements are the marketable securities related to our Deferred Compensation Plan (See Note 15 “Employee Benefit Plans” for additional information). The following table sets forth the fair value of our Deferred Compensation Plan:


	Fair Value (Level 1) (1)
	December 31, 2025		December 31, 2024
Description	(in thousands)
Deferred Compensation Plan assets (2)	$	30,807	$	27,965

____________________

(1)Based on quoted prices in active markets for identical securities.

(2)The Deferred Compensation Plan assets are held in a limited rabbi trust.

Financial Instruments Disclosed at Fair Value

The following table sets forth the carrying value and the fair value of our other financial instruments:


	December 31, 2025				December 31, 2024
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)


Liabilities
Secured debt, net	$	592,685	$	587,244	$	598,199	$	569,061
Unsecured debt, net	$	3,996,774	$	3,834,485	$	3,999,566	$	3,681,914

Fair value is calculated using Level 2 inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Net Income Available to Common Stockholders Per Share of the Company

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Net Income Available to Common Stockholders Per Share of the Company

The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders:


	Year Ended December 31,
	2025		2024		2023
	(in thousands, except share and per share amounts)
Numerator:
Net income available to common stockholders	$	276,121	$	210,969	$	212,241

Allocation to participating securities (1)	(925)		(1,967)		(1,233)
Numerator for basic and diluted net income available to common stockholders	$	275,196	$	209,002	$	211,008
Denominator:
Basic weighted average vested shares outstanding	118,278,990		117,649,111		117,160,173
Effect of dilutive securities	553,045		507,876		346,082
Diluted weighted average vested shares and common stock equivalents outstanding	118,832,035		118,156,987		117,506,255
Basic earnings per share:
Net income available to common stockholders per share	$	2.33	$	1.78	$	1.80
Diluted earnings per share:
Net income available to common stockholders per share	$	2.32	$	1.77	$	1.80

_____________________

(1)Participating securities include certain time-based RSUs and vested market measure-based RSUs.

Share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are considered participating securities. The impact of potentially dilutive common shares, including RSUs, are considered in our diluted earnings per share calculation for the years ended December 31, 2025, 2024, and 2023. Certain performance-based RSUs are not included in dilutive securities as of December 31, 2025, 2024, and 2023 as not all performance metrics had been met by the end of the applicable reporting periods. Additionally, certain unvested time-based RSUs are not included in dilutive securities for the year ended December 31, 2023 as they were anti-dilutive.

See Note 14 “Share-Based and Other Compensation” for additional information regarding the RSUs.

Net Income Available to Common Unitholders Per Unit of the Operating Partnership

12 Months Ended

Dec. 31, 2025

Net Income Available To Common Unitholders [Line Items]

Net Income Available to Common Unitholders Per Unit of the Operating Partnership

Net Income Available to Common Stockholders Per Share of the Company

The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders:


	Year Ended December 31,
	2025		2024		2023
	(in thousands, except share and per share amounts)
Numerator:
Net income available to common stockholders	$	276,121	$	210,969	$	212,241

Allocation to participating securities (1)	(925)		(1,967)		(1,233)
Numerator for basic and diluted net income available to common stockholders	$	275,196	$	209,002	$	211,008
Denominator:
Basic weighted average vested shares outstanding	118,278,990		117,649,111		117,160,173
Effect of dilutive securities	553,045		507,876		346,082
Diluted weighted average vested shares and common stock equivalents outstanding	118,832,035		118,156,987		117,506,255
Basic earnings per share:
Net income available to common stockholders per share	$	2.33	$	1.78	$	1.80
Diluted earnings per share:
Net income available to common stockholders per share	$	2.32	$	1.77	$	1.80

_____________________

(1)Participating securities include certain time-based RSUs and vested market measure-based RSUs.

Share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are considered participating securities. The impact of potentially dilutive common shares, including RSUs, are considered in our diluted earnings per share calculation for the years ended December 31, 2025, 2024, and 2023. Certain performance-based RSUs are not included in dilutive securities as of December 31, 2025, 2024, and 2023 as not all performance metrics had been met by the end of the applicable reporting periods. Additionally, certain unvested time-based RSUs are not included in dilutive securities for the year ended December 31, 2023 as they were anti-dilutive.

See Note 14 “Share-Based and Other Compensation” for additional information regarding the RSUs.

Kilroy Realty L.P.

Net Income Available To Common Unitholders [Line Items]

Net Income Available to Common Unitholders Per Unit of the Operating Partnership

The following table reconciles the numerator and denominator in computing the Operating Partnership’s basic and diluted per-unit computations for net income available to common unitholders:


	Year Ended December 31,
	2025		2024		2023
	(in thousands, except unit and per unit amounts)
Numerator:
Net income available to common unitholders	$	278,803	$	213,031	$	214,324

Allocation to participating securities (1)	(925)		(1,967)		(1,233)
Numerator for basic and diluted net income available to common unitholders	$	277,878	$	211,064	$	213,091
Denominator:
Basic weighted average vested units outstanding	119,428,865		118,799,685		118,310,747
Effect of dilutive securities	553,045		507,876		346,082
Diluted weighted average vested units and common unit equivalents outstanding	119,981,910		119,307,561		118,656,829
Basic earnings per unit:
Net income available to common unitholders per unit	$	2.33	$	1.78	$	1.80
Diluted earnings per unit:
Net income available to common unitholders per unit	$	2.32	$	1.77	$	1.80

____________________

(1)Participating securities include certain time-based RSUs and vested market measure-based RSUs.

Share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are considered participating securities. The impact of potentially dilutive common units, including RSUs, are considered in our diluted earnings per share calculation for the years ended December 31, 2025, 2024, and 2023. Certain performance-based RSUs are not included in dilutive securities as of December 31, 2025, 2024, and 2023 as not all performance metrics had been met by the end of the applicable reporting periods. Additionally, certain unvested time-based RSUs are not included in dilutive securities for the year ended December 31, 2023 as they were anti-dilutive.

See Note 14 “Share-Based and Other Compensation” for additional information regarding the RSUs.

Supplemental Cash Flow Information of the Company and the Operating Partnership

12 Months Ended

Dec. 31, 2025

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flows Information of the Company and the Operating Partnership

Supplemental cash flows information of the Company is as follows:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $79,542, $77,871, and $74,052 as of December 31, 2025, 2024, and 2023, respectively	$	115,912	$	126,668	$	105,767
Cash paid for amounts included in the measurement of ground lease liabilities	$	7,578	$	6,484	$	6,733
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	$	62,570	$	54,190	$	95,575
Tenant improvements funded directly by tenants	$	3,026	$	2,745	$	7,364



Remeasurement of ground lease liability and related right of use ground lease asset	$	—	$	4,782	$	—



NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 12)	$	65,009	$	64,850	$	64,440

Supplemental cash flows information of the Operating Partnership is as follows:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $79,542, $77,871, and $74,052 as of December 31, 2025, 2024, and 2023, respectively	$	115,912	$	126,668	$	105,767
Cash paid for amounts included in the measurement of ground lease liabilities	$	7,578	$	6,484	$	6,733
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	$	62,570	$	54,190	$	95,575
Tenant improvements funded directly by tenants	$	3,026	$	2,745	$	7,364




Remeasurement of ground lease liability and related right of use ground lease asset	$	—	$	4,782	$	—

NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 13)	$	65,009	$	64,850	$	64,440

Tax Treatment of Distributions

12 Months Ended

Dec. 31, 2025

Tax Treatment of Distributions [Abstract]

Tax Treatment of Distributions

The following table reconciles the dividends declared per share of common stock to the dividends paid per share of common stock as follows:


	Year Ended December 31,
Dividends	2025		2024		2023
Dividends declared per share of common stock	$	2.16	$	2.16	$	2.16
Less: Dividends declared in the current year and paid in the following year	(0.54)		(0.54)		(0.54)
Add: Dividends declared in the prior year and paid in the current year	0.54		0.54		0.54
Dividends paid per share of common stock	$	2.16	$	2.16	$	2.16

The unaudited income tax treatment for the dividends to common stockholders reportable as identified in the table above was as follows:


	Year Ended December 31,
Shares of Common Stock	2025				2024				2023
Ordinary dividend (1) (2)	$	1.43	66.34	%	$	1.92	88.75	%	$	2.09	96.67	%

Return of capital	0.25		11.62	%	0.24		11.02	%	0.07		3.21	%
Capital gains	0.04		1.76	%	0.01		0.23	%	—		0.12	%
Unrecaptured section 1250 gains	0.44		20.28	%	—		—	%	—		—	%
	$	2.16	100.00	%	$	2.16	100.00	%	$	2.16	100.00	%

____________________

(1)Total qualified dividend, which is a subset of, and is included in, the Ordinary dividend amount.

(2)The Tax Cuts and Jobs Act enacted on December 22, 2017 generally allows a deduction for noncorporate taxpayers equal to 20% of ordinary dividends distributed by a REIT (excluding capital gain dividends and qualified dividend income). The amount of dividend eligible for this deduction is referred to as the Section 199A Dividend. For the year ended December 31, 2025, the Section 199A Dividend is equal to the total ordinary income dividend.

Segments

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Segments

Operating segments are defined as components of an enterprise that engage in business activities from which they may earn revenues and incur expenses and about which discrete financial information is available that is evaluated regularly by the Chief Operating Decision Maker (“CODM”). The CODM decides how resources are allocated and assesses performance on a recurring basis, at least quarterly. Our CODM is our CEO, who evaluates the operating performance and financial results of our consolidated portfolio based on Net Income through monthly operations meetings.

We conduct our business on a consolidated basis in one operating segment and therefore have one reportable segment. Asset information by segment is not reported because the Company does not use this measure to assess performance.

Our reportable segment derives its revenues primarily from rental revenue and related property income through the leasing of commercial real estate space to tenants. We recognize revenue from base rent (fixed lease payments), additional rent (variable lease payments, which consist of amounts due from tenants for common area maintenance, real estate taxes, percentage rent, and other recoverable costs), parking, and other lease-related revenue.

The following table presents Net Income:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
REVENUES:
Rental income	$	1,093,587	$	1,118,115	$	1,117,737
Other property income	19,080		17,514		11,957
Total revenues	1,112,667		1,135,629		1,129,694
EXPENSES:
Property expenses	243,726		243,441		228,964
Real estate taxes	107,564		108,951		105,868
Ground leases	12,048		11,715		9,732
General and administrative expenses	73,108		71,074		94,264
Leasing costs	10,352		8,764		6,506
Depreciation and amortization	354,854		356,182		355,278
Total expenses	801,652		800,127		800,612
OTHER INCOME (EXPENSES):
Interest income	6,970		37,752		22,592
Interest expense	(126,292)		(145,287)		(114,216)
Other income (expense)	168		(992)		830
Gains on sales of depreciable operating properties	127,038		—		—
Impairment of real estate assets	(16,259)		—		—


Gain on sale of long-lived assets	—		5,979		—
Total other expenses	(8,375)		(102,548)		(90,794)
NET INCOME	$	302,640	$	232,954	$	238,288

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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+ Details

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS

Years ended December 31, 2025, 2024, and 2023

(in thousands)


	Balance at Beginning of Period		Charged to Costs and Expenses (1)		Deductions (2)		Balance at End of Period
Allowance for Uncollectible Tenant Receivables for the year ended December 31,
2025 – Allowance for uncollectible tenant receivables	$	314	$	420	$	(490)	$	244
2024 – Allowance for uncollectible tenant receivables	$	1,567	$	374	$	(1,627)	$	314
2023 – Allowance for uncollectible tenant receivables	$	2,233	$	1,524	$	(2,190)	$	1,567
Allowance for Deferred Rent Receivables for the year ended December 31,
2025 – Allowance for deferred rent	$	—	$	1	$	(1)	$	—
2024 – Allowance for deferred rent	$	728	$	—	$	(728)	$	—
2023 – Allowance for deferred rent	$	965	$	667	$	(904)	$	728

____________________

(1)Amounts do not reflect leases deemed not probable of collection for which we reversed the associated revenue under Topic 842. Also does not reflect the adjustment to restore leases previously deemed not probable of collection to an accrual basis.

(2)For the year ended December 31, 2024, includes reversals of allowance for doubtful accounts for tenants with an allowance at January 1, 2024, that were subsequently deemed not probable of collection and transitioned to a cash basis of reporting within the same year.

Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III - Real Estate and Accumulated Depreciation

SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2025


	Initial Cost							Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances	Land and Improve- ments		Buildings and Improve- ments		Costs Capitalized Subsequent to Acquisition/ Improvement		Land and Improve- ments		Buildings and Improve- ments		Total		Accumulated Depreciation		Depreci- ation Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	($ in thousands)
Commercial Real Estate Properties:
335 - 345 N. Maple Dr., Beverly Hills, CA (4)		$	28,986	$	154,148	$	305	$	28,986	$	154,453	$	183,439	$	2,356	35	2025	A	306,366
3101 - 3243 S. La Cienega Blvd., Culver City, CA		150,718		31,033		8,524		150,718		39,557		190,275		29,276		35	2019	A	166,207
2240 E. Imperial Highway, El Segundo, CA		1,044		11,763		30,740		1,048		42,499		43,547		33,616		35	1983	C	122,870
2250 E. Imperial Highway, El Segundo, CA		2,579		29,062		38,157		2,547		67,251		69,798		63,889		35	1983	C	298,728
2260 E. Imperial Highway, El Segundo, CA		2,518		28,370		38,003		2,547		66,344		68,891		29,746		35	2012	C	298,728
909 N. Pacific Coast Highway, El Segundo, CA		3,577		34,042		60,611		3,565		94,665		98,230		61,673		35	2005	C	244,880
999 N. Pacific Coast Highway, El Segundo, CA		1,407		34,326		19,308		1,407		53,634		55,041		37,781		35	2003	C	138,389
3750 Kilroy Airport Way, Long Beach, CA		—		1,941		13,718		—		15,659		15,659		13,660		35	1989	C	10,718
3760 Kilroy Airport Way, Long Beach, CA		—		17,467		24,161		—		41,628		41,628		35,657		35	1989	C	166,761
3780 Kilroy Airport Way, Long Beach, CA		—		22,319		41,190		—		63,509		63,509		53,312		35	1989	C	221,452
3800 Kilroy Airport Way, Long Beach, CA		—		19,408		25,856		—		45,264		45,264		35,231		35	2000	C	192,476
3840 Kilroy Airport Way, Long Beach, CA		—		13,586		33,409		—		46,995		46,995		25,243		35	1999	C	138,441
3880 Kilroy Airport Way, Long Beach, CA		—		9,704		18,398		—		28,102		28,102		8,721		35	2013	C	96,922
3900 Kilroy Airport Way, Long Beach, CA		—		12,615		23,741		—		36,356		36,356		24,566		35	1997	A	130,935
1350 Ivar Ave., Los Angeles, CA (5)		1,575		—		14,276		1,575		14,276		15,851		2,104		35	2020	C	16,448
1355 Vine St., Los Angeles, CA (5)		17,588		—		120,294		17,588		120,294		137,882		18,232		35	2020	C	183,129
1375 Vine St., Los Angeles, CA (5)		15,578		—		103,368		15,578		103,368		118,946		15,626		35	2020	C	159,236
1395 Vine St., Los Angeles, CA (5)		278		—		3,261		278		3,261		3,539		481		35	2020	C	2,575
1500 N. El Centro Ave., Los Angeles, CA (6)		9,235		21		64,156		9,235		64,177		73,412		21,890		35	2016	C	113,447
1525 N. Gower St., Los Angeles, CA (6)		1,318		3		9,774		1,318		9,777		11,095		3,374		35	2016	C	9,610
1575 N. Gower St., Los Angeles, CA (6)		22,153		51		120,294		22,153		120,345		142,498		33,933		35	2016	C	264,430
6115 W. Sunset Blvd., Los Angeles, CA (6)		1,313		3		17,259		2,455		16,120		18,575		6,235		35	2015	C	26,238
6121 W. Sunset Blvd., Los Angeles, CA (6)		11,120		4,256		42,373		8,703		49,046		57,749		14,678		35	2015	C	93,418
8560 W. Sunset Blvd., West Hollywood, CA		9,720		50,956		8,435		9,720		59,391		69,111		19,995		35	2016	A	76,359
8570 W. Sunset Blvd., West Hollywood, CA		31,693		27,974		7,277		31,693		35,251		66,944		12,137		35	2016	A	49,276
8580 W. Sunset Blvd., West Hollywood, CA		10,013		3,695		1,844		10,013		5,539		15,552		2,047		35	2016	A	6,875
8590 W. Sunset Blvd., West Hollywood, CA		39,954		27,884		6,157		39,954		34,041		73,995		11,092		35	2016	A	56,750
12100 W. Olympic Blvd., Los Angeles, CA		352		45,611		30,156		9,633		66,486		76,119		41,670		35	2003	C	155,679
12200 W. Olympic Blvd., Los Angeles, CA		4,329		35,488		32,085		3,977		67,925		71,902		52,690		35	2000	C	154,544
12233 W. Olympic Blvd., Los Angeles, CA		22,100		53,170		7,147		22,100		60,317		82,417		25,998		35	2012	A	156,746
12312 W. Olympic Blvd., Los Angeles, CA		3,325		12,202		12,741		3,399		24,869		28,268		21,516		35	1997	A	78,900
2100/2110 Colorado Ave., Santa Monica, CA		5,474		26,087		21,796		5,476		47,881		53,357		35,412		35	1997	A	104,853
12225 El Camino Real, San Diego, CA		1,700		9,633		4,890		1,673		14,550		16,223		11,750		35	1998	A	58,401
12235 El Camino Real, San Diego, CA		1,507		8,543		10,461		1,540		18,971		20,511		15,572		35	1998	A	53,751

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION – (Continued)

December 31, 2025


	Initial Cost					Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances		Land and Improve- ments	Buildings and Improve- ments	Costs Capitalized Subsequent to Acquisition/ Improvement	Land and Improve- ments	Buildings and Improve- ments	Total	Accumulated Depreciation	Depreci- ation Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	($ in thousands)
12340 El Camino Real, San Diego, CA			4,201	—	40,640	4,201	40,640	44,841	6,474	35	2022	C	110,950
12390 El Camino Real, San Diego, CA			3,453	11,981	12,910	3,453	24,891	28,344	16,959	35	2000	C	73,238
12770 El Camino Real, San Diego, CA			9,360	—	37,329	9,360	37,329	46,689	10,747	35	2016	C	75,035
12780 El Camino Real, San Diego, CA			18,398	54,954	24,329	18,398	79,283	97,681	35,624	35	2013	A	140,591
12790 El Camino Real, San Diego, CA			10,252	21,236	17,163	10,252	38,399	48,651	16,560	35	2013	A	87,944
12830 El Camino Real, San Diego, CA	$375,000	(7)	28,645	—	113,232	28,645	113,232	141,877	20,696	35	2021	C	196,444
12860 El Camino Real, San Diego, CA		(7)	11,326	—	53,257	11,326	53,257	64,583	9,658	35	2021	C	92,042
12348 High Bluff Dr., San Diego, CA			1,629	3,096	10,270	1,629	13,366	14,995	10,115	35	1999	C	39,192
12400 High Bluff Dr., San Diego, CA			15,167	—	50,063	15,167	50,063	65,230	14,629	35	2022	C	216,518
12707 High Bluff Dr., San Diego, CA			3,013	8,032	1,400	3,013	9,432	12,445	775	35	2024	A	59,245
12777 High Bluff Dr., San Diego, CA			3,013	6,134	782	3,013	6,916	9,929	573	35	2024	A	44,486
3579 Valley Centre Dr., San Diego, CA			2,167	6,897	11,977	2,858	18,183	21,041	13,286	35	1999	C	54,960
3611 Valley Centre Dr., San Diego, CA			4,184	19,352	29,823	5,259	48,100	53,359	37,365	35	2000	C	132,425
3661 Valley Centre Dr., San Diego, CA			4,038	21,144	21,366	4,725	41,823	46,548	33,190	35	2001	C	124,756
3721 Valley Centre Dr., San Diego, CA			4,297	18,967	19,934	4,254	38,944	43,198	25,998	35	2003	C	117,777
3811 Valley Centre Dr., San Diego, CA			3,452	16,152	22,042	4,457	37,189	41,646	29,027	35	2000	C	118,912
3745 Paseo Place, San Diego, CA (Retail)		(7)	24,358	—	76,879	24,358	76,879	101,237	16,296	35	2019	C	95,871
2100 Kettner Blvd., San Diego, CA			19,861	—	113,891	19,861	113,891	133,752	10,557	35	2022	C	212,915
2305 Historic Decatur Rd., San Diego, CA			5,240	22,220	12,114	5,240	34,334	39,574	19,661	35	2010	A	107,456
3530 John Hopkins Ct., San Diego, CA (8)			4,225	31,258	332	4,262	31,553	35,815	190	35	2025	A	45,589
3535 General Atomics Ct., San Diego, CA (8)			7,433	43,774	465	7,499	44,173	51,672	193	35	2025	A	80,543
3550 John Hopkins Ct., San Diego, CA (8)			5,598	33,443	347	5,647	33,741	39,388	112	35	2025	A	62,739
3565 General Atomics Ct., San Diego, CA (8)			4,057	24,355	253	4,093	24,572	28,665	84	35	2025	A	43,295
4690 Executive Dr., San Diego, CA (9)			1,623	19,686	1,368	1,624	21,053	22,677	1,447	35	2025	C	52,074
9455 Towne Centre Dr., San Diego, CA			6,081	—	79,595	6,081	79,595	85,676	12,233	35	2021	C	160,444
9514 Towne Centre Dr., San Diego, CA			4,928	—	47,756	4,928	47,756	52,684	3,451	35	2023	C	70,616
4100 Bohannon Dr., Menlo Park, CA			4,835	15,526	1,525	4,860	17,026	21,886	7,743	35	2012	A	47,643
4200 Bohannon Dr., Menlo Park, CA			4,798	15,406	8,414	4,662	23,956	28,618	11,723	35	2012	A	43,600
4300 Bohannon Dr., Menlo Park, CA			6,527	20,958	8,047	6,470	29,062	35,532	14,265	35	2012	A	63,430
4400 Bohannon Dr., Menlo Park, CA (10)			4,939	43,213	3,115	4,939	46,328	51,267	2,589	35	2025	C	48,414
4500 Bohannon Dr., Menlo Park, CA			6,527	20,957	6,035	6,470	27,049	33,519	12,920	35	2012	A	63,429
4600 Bohannon Dr., Menlo Park, CA			4,798	15,406	5,424	4,939	20,689	25,628	10,692	35	2012	A	48,413
4700 Bohannon Dr., Menlo Park, CA			6,527	20,958	1,576	6,470	22,591	29,061	10,384	35	2012	A	63,429
1290 - 1300 Terra Bella Ave., Mountain View, CA			28,730	27,555	13,522	28,730	41,077	69,807	13,628	35	2016	A	114,175
680 E. Middlefield Rd., Mountain View, CA			34,755	—	56,759	34,755	56,759	91,514	21,383	35	2014	C	171,676

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION – (Continued)

December 31, 2025


	Initial Cost					Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances		Land and Improve- ments	Buildings and Improve- ments	Costs Capitalized Subsequent to Acquisition/ Improvement	Land and Improve- ments	Buildings and Improve- ments	Total	Accumulated Depreciation	Depreci- ation Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	($ in thousands)
690 E. Middlefield Rd., Mountain View, CA			34,605	—	56,515	34,605	56,515	91,120	21,291	35	2014	C	171,215
1701 Page Mill Rd., Palo Alto, CA			—	99,522	117	—	99,639	99,639	27,030	35	2016	A	128,688
3150 Porter Dr., Palo Alto, CA			—	21,715	6,446	—	28,161	28,161	8,888	35	2016	A	36,886
900 Jefferson Ave., Redwood City, CA (11)			16,668	—	109,784	18,063	108,389	126,452	38,994	35	2015	C	228,226
900 Middlefield Rd., Redwood City, CA (11)			7,959	—	64,979	8,626	64,312	72,938	19,269	35	2015	C	119,616
100 First St., San Francisco, CA (12)			49,150	131,238	86,415	49,150	217,653	266,803	125,428	35	2010	A	480,457
100 Hooper St., San Francisco, CA	148,815	(13)	78,564	—	197,034	85,510	190,088	275,598	41,819	35	2018	C	417,914
201 Third St., San Francisco, CA			19,260	84,018	85,856	19,260	169,874	189,134	109,440	35	2011	A	355,960
360 Third St., San Francisco, CA			—	88,235	128,912	28,504	188,643	217,147	87,745	35	2011	A	436,357
250 Brannan St., San Francisco, CA			7,630	22,770	10,797	7,630	33,567	41,197	17,628	35	2011	A	100,850
301 Brannan St., San Francisco, CA			5,910	22,450	17,817	5,910	40,267	46,177	19,487	35	2011	A	82,834
333 Brannan St., San Francisco, CA			18,645	—	80,685	18,645	80,685	99,330	23,730	35	2016	C	185,602
345 Brannan St., San Francisco, CA			29,405	113,179	1,358	29,403	114,539	143,942	23,665	35	2018	A	110,050
303 Second St., San Francisco, CA (14)			63,550	154,153	123,735	63,550	277,888	341,438	159,024	35	2010	A	784,658
350 Mission St., San Francisco, CA			52,815	—	212,906	52,815	212,906	265,721	64,520	35	2016	C	455,340
345 Oyster Point Blvd., South San Francisco, CA			13,745	18,575	1	13,745	18,576	32,321	4,504	35	2018	A	40,410
347 Oyster Point Blvd., South San Francisco, CA			14,071	18,289	44	14,071	18,333	32,404	4,455	35	2018	A	39,780
349 Oyster Point Blvd., South San Francisco, CA			23,112	22,601	352	23,112	22,953	46,065	6,824	35	2018	A	65,340
350 Oyster Point Blvd., South San Francisco, CA			23,719	—	177,047	23,719	177,047	200,766	22,614	35	2021	C	234,892
352 Oyster Point Blvd., South San Francisco, CA			23,449	—	165,524	23,449	165,524	188,973	23,061	35	2021	C	232,215
354 Oyster Point Blvd., South San Francisco, CA			19,538	—	141,063	19,538	141,063	160,601	22,126	35	2021	C	193,472
365 Oyster Point Blvd., South San Francisco, CA (15)			—	—	—	—	—	—	62	35	0	C	—
10900 NE 4th St., Bellevue, WA			25,080	150,877	66,352	25,080	217,229	242,309	106,671	35	2012	A	428,557
601 108th Ave., Bellevue, WA			—	214,095	99,439	42,680	270,854	313,534	136,292	35	2011	A	490,738
2001 8th Ave., Seattle, WA			84,076	371,154	36,691	84,076	407,845	491,921	53,879	35	2021	A	535,395
320 Westlake Ave. North, Seattle, WA	76,627	(16)	14,710	82,018	16,653	14,710	98,671	113,381	41,086	35	2013	A	184,644
321 Terry Ave. North, Seattle, WA		(16)	10,430	60,003	11,066	10,430	71,069	81,499	30,777	35	2013	A	135,755
401 Terry Ave. North, Seattle, WA			22,500	77,046	235	22,500	77,281	99,781	28,806	35	2014	A	174,530
333 Dexter Ave. North, Seattle, WA			42,854	—	328,064	42,854	328,064	370,918	48,068	35	2022	C	618,766
701 N. 34th St., Seattle, WA			—	48,027	16,696	—	64,723	64,723	28,986	35	2012	A	143,136
801 N. 34th St., Seattle, WA			—	58,537	23,925	—	82,462	82,462	37,188	35	2012	A	173,615
837 N. 34th St., Seattle, WA			—	37,404	8,619	—	46,023	46,023	21,410	35	2012	A	112,487
200 W. 6th St., Austin, TX			—	—	664,974	—	664,974	664,974	60,117	35	2023	C	758,975
Residential Properties:
1550 N. El Centro Ave., Los Angeles, CA (6)			16,970	39	139,686	16,970	139,725	156,695	38,230	35	2016	C	—

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION – (Continued)

December 31, 2025


	Initial Cost									Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances			Land and Improve- ments		Buildings and Improve- ments		Costs Capitalized Subsequent to Acquisition/ Improvement		Land and Improve- ments		Buildings and Improve- ments		Total		Accumulated Depreciation		Depreci- ation Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	($ in thousands)
6390 De Longpre Ave., Los Angeles, CA (5)				12,112		—		162,693		12,112		162,693		174,805		22,108		35	2021	C	—
3200 Paseo Village Way, San Diego, CA			(7)	106,419		—		272,319		106,419		272,319		378,738		46,203		35	2020	C	—
TOTAL OPERATING PROPERTIES	600,442			1,550,535		3,163,966		5,432,898		1,641,913		8,505,486		10,147,399		2,843,811					16,292,164
Undeveloped land and construction in progress	—			787,640		—		1,600,102		787,640		1,600,102		2,387,742		—					—
TOTAL ALL PROPERTIES	$	600,442	(17)	$	2,338,175	$	3,163,966	$	7,033,000	$	2,429,553	$	10,105,588	$	12,535,141	$	2,843,811				16,292,164

____________________

(1)The initial costs of buildings and improvements are depreciated over 35 years using a straight-line method of accounting; improvements capitalized subsequent to acquisition or development are depreciated over the shorter of the lease term or useful life, generally ranging from one to 20 years.

(2)Represents our date of construction or acquisition, or of our predecessor, the Kilroy Group.

(3)Represents the square footage of our stabilized portfolio.

(4)This property was acquired in the third quarter of 2025.

(5)These properties include the allocated costs of a shared parking structure for a complex comprised of four office buildings and one residential tower.

(6)These properties include the allocated costs of a shared parking structure for a complex comprised of five office buildings and one residential tower.

(7)These properties secure a $375.0 million mortgage note.

(8)These properties were acquired in the fourth quarter of 2025.

(9)This property was taken out of the stabilized portfolio in the first quarter of 2022 for redevelopment in phases, and placed back into the stabilized portfolio during the third quarter of 2025, upon reaching one year from substantial completion of base building components.

(10)This property was taken out of the stabilized portfolio in the fourth quarter of 2022 for redevelopment, and placed back into the stabilized portfolio during the third quarter of 2025, upon reaching one year from substantial completion of base building components.

(11)These properties are owned by Redwood City Partners LLC, a consolidated property partnership.

(12)This property is owned by 100 First Street Member LLC, a consolidated property partnership.

(13)This property secures a $148.8 million mortgage note.

(14)This property is owned by 303 Second Street Member LLC, a consolidated property partnership.

(15)This property is currently in the tenant improvement phase of our in-process development projects and not yet in the stabilized portfolio. The estimated rentable square feet for this property is 871,738 rentable square feet.

(16)These properties secure a $76.6 million mortgage note.

(17)Represents gross aggregate principal amount before the effect of the deferred financing costs of $7.8 million as of December 31, 2025.

As of December 31, 2025, the aggregate gross cost of property included above for federal income tax purposes approximated $10.6 billion.

The following table reconciles the historical cost of total real estate held for investment from January 1, 2023 to December 31, 2025:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Total real estate held for investment, beginning of year	$	12,659,195	$	12,241,648	$	11,732,183
Additions during period:
Acquisitions	338,678		21,941		—
Improvements, etc.	249,704		400,880		511,866
Total additions during period	588,382		422,821		511,866
Deductions during period:
Cost of real estate sold	(483,776)		—		—
Properties held for sale	(221,693)		—		—
Other	(6,967)		(5,274)		(2,401)
Total deductions during period	(712,436)		(5,274)		(2,401)
Total real estate held for investment, end of year	$	12,535,141	$	12,659,195	$	12,241,648

The following table reconciles the accumulated depreciation from January 1, 2023 to December 31, 2025:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Accumulated depreciation, beginning of year	$	2,824,616	$	2,518,304	$	2,218,710
Additions during period:
Depreciation of real estate	305,751		307,967		300,119
Total additions during period	305,751		307,967		300,119
Deductions during period:
Write-offs due to sale	(166,696)		—		—
Properties held for sale	(116,693)		—		—
Other	(3,167)		(1,655)		(525)
Total deductions during period	(286,556)		(1,655)		(525)
Accumulated depreciation, end of year	$	2,843,811	$	2,824,616	$	2,518,304

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Dec. 31, 2025
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Cybersecurity Our Board of Directors recognizes the critical importance of maintaining the trust and confidence of our tenants, investors, business partners, and employees, and is actively involved in the oversight of our enterprise risk management (“ERM”). As a key component of our ERM framework, the Board of Directors oversees cybersecurity risk as part of its overall risk oversight responsibilities. The Board of Directors has delegated primary oversight of cybersecurity and other information technology risks to the Audit Committee, which monitors management’s implementation and administration of our cybersecurity risk management program. Our cybersecurity policies, standards, processes, and practices are integrated into our enterprise risk strategy and are explicitly mapped to the NIST Cybersecurity Framework (Identify, Protect, Detect, Respond, Recover). This framework defines how we structure, implement, and govern our controls, including risk assessments, monitoring, incident response, and recovery activities, alongside other applicable standards. In general, we seek to address cybersecurity risks through a cross-functional approach that is focused on preserving the confidentiality, integrity, and availability of the information systems and information that we collect and store by identifying, preventing and mitigating cybersecurity threats and effectively responding to any incidents. Risk Management and Strategy Our cybersecurity program is focused on the following areas: Governance. The Board of Directors’ oversight of cybersecurity risk management is supported by the Audit Committee, which regularly interacts with members of Kilroy’s executive team including our Senior Vice President, Chief Technology Officer (“CTO”), Executive Vice President, General Counsel and Secretary, and Senior Director, Cybersecurity. Collaborative Approach. We have implemented a cross-functional approach to identifying, preventing, and mitigating cybersecurity threats and incidents. Safeguards. We deploy technical and non-technical safeguards that are designed to protect our information systems from cybersecurity threats, including anti-malware, firewalls, intrusion prevention and detection systems, and privilege access controls, which are evaluated and improved through vulnerability assessments and control testing. We operate a security operations center which monitors our environment in a continuous manner. Incident Response and Recovery Planning. We have established and maintain business continuity and technical recovery plans of critical systems and resources in the event of a cybersecurity incident, and such plans are tested and evaluated on a recurring basis. We also maintain a cybersecurity insurance policy, though the cost related to cybersecurity incidents or disruptions may not fully be covered. Third Party Risk Management. We maintain a third-party cyber risk management program to identify and oversee cybersecurity risks presented by third-party providers, including vendors, consultants, service providers, and other external users of our system, as well as systems of third parties that could adversely impact our business in the event of a cybersecurity incident. We may conduct upfront diligence and ongoing monitoring and/or seek contractual protections depending on our assessment of each provider’s criticality to our operations, access to our systems and information, and overall risk profile. In the event that we identify a risk, we communicate the risk to the third party and monitor remediation. Education and Awareness. We provide regular training, including ongoing end-user security awareness training and attack simulation assessments for employees regarding cybersecurity threats to equip our employees with tools to address cybersecurity threats, and to communicate our evolving information security policies, standards, processes, and practices. We are aware of known risks, including as a result of prior cybersecurity incidents, that have not materially affected us, including our operations, business strategy, results of operations, or financial condition. We face certain ongoing risks from cybersecurity threats that, if realized, are reasonably likely to materially affect us, including our operations, business strategy, results of operations, or financial condition. See “Part 1. Item 1A. Risk Factors – We face risks associated with perceived or actual security breaches through cyberattacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems or those of our critical service providers.”
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Our cybersecurity policies, standards, processes, and practices are integrated into our enterprise risk strategy and are explicitly mapped to the NIST Cybersecurity Framework (Identify, Protect, Detect, Respond, Recover). This framework defines how we structure, implement, and govern our controls, including risk assessments, monitoring, incident response, and recovery activities, alongside other applicable standards.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	In connection with their oversight responsibilities, the Audit Committee receives periodic updates and the Board of Directors is briefed at least annually by our CTO on cybersecurity risks and related risk management, which includes topics such as the status of and specific metrics related to our cybersecurity program, recent developments, evolving standards and regulations, vulnerability assessments, third-party and independent reviews, the current threat environment, technology trends, and information security considerations arising with respect to our peers and third parties. Additionally, the Audit Committee receives prompt and ongoing information regarding significant cybersecurity incidents. The CTO and Senior Director, Cybersecurity are primarily responsible for assessing and managing cybersecurity risks and work collaboratively across the business to implement a program designed to protect our information systems from cybersecurity threats and to promptly respond to any future cybersecurity incidents in accordance with our incident response and business continuity plans. Through ongoing communications, the CTO and Senior Director, Cybersecurity help our Executive Vice President, General Counsel and Secretary, among others, to stay informed of, and monitor the prevention, detection, mitigation, and remediation of cybersecurity threats and incidents. Our CTO has more than 15 years of experience in senior information technology leadership roles spanning enterprise data, analytics, and corporate applications, with responsibilities that have included technology platform strategy, cybersecurity risk management, and operational resilience. The CTO also holds industry‑recognized credentials, including the Certified Information Security Manager (CISM) certification and a graduate certificate in Information Technology and Information Systems. Our Senior Director, Cybersecurity, brings extensive leadership experience in information security, having served as the Chief Information Security Officer for three public companies, and holds an undergraduate degree in Information Systems, a master’s degree in Cybersecurity and Information Assurance, and multiple professional certifications, including Certified Chief Information Security Officer and Certified Chief Risk Officer.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board of Directors’ oversight of cybersecurity risk management is supported by the Audit Committee,
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board of Directors’ oversight of cybersecurity risk management is supported by the Audit Committee, which regularly interacts with members of Kilroy’s executive team including our Senior Vice President, Chief Technology Officer (“CTO”), Executive Vice President, General Counsel and Secretary, and Senior Director, Cybersecurity.
Cybersecurity Risk Role of Management [Text Block]	In connection with their oversight responsibilities, the Audit Committee receives periodic updates and the Board of Directors is briefed at least annually by our CTO on cybersecurity risks and related risk management, which includes topics such as the status of and specific metrics related to our cybersecurity program, recent developments, evolving standards and regulations, vulnerability assessments, third-party and independent reviews, the current threat environment, technology trends, and information security considerations arising with respect to our peers and third parties. Additionally, the Audit Committee receives prompt and ongoing information regarding significant cybersecurity incidents. The CTO and Senior Director, Cybersecurity are primarily responsible for assessing and managing cybersecurity risks and work collaboratively across the business to implement a program designed to protect our information systems from cybersecurity threats and to promptly respond to any future cybersecurity incidents in accordance with our incident response and business continuity plans. Through ongoing communications, the CTO and Senior Director, Cybersecurity help our Executive Vice President, General Counsel and Secretary, among others, to stay informed of, and monitor the prevention, detection, mitigation, and remediation of cybersecurity threats and incidents.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Board of Directors’ oversight of cybersecurity risk management is supported by the Audit Committee, which regularly interacts with members of Kilroy’s executive team including our Senior Vice President, Chief Technology Officer (“CTO”), Executive Vice President, General Counsel and Secretary, and Senior Director, Cybersecurity.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CTO has more than 15 years of experience in senior information technology leadership roles spanning enterprise data, analytics, and corporate applications, with responsibilities that have included technology platform strategy, cybersecurity risk management, and operational resilience. The CTO also holds industry‑recognized credentials, including the Certified Information Security Manager (CISM) certification and a graduate certificate in Information Technology and Information Systems. Our Senior Director, Cybersecurity, brings extensive leadership experience in information security, having served as the Chief Information Security Officer for three public companies, and holds an undergraduate degree in Information Systems, a master’s degree in Cybersecurity and Information Assurance, and multiple professional certifications, including Certified Chief Information Security Officer and Certified Chief Risk Officer.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	In connection with their oversight responsibilities, the Audit Committee receives periodic updates and the Board of Directors is briefed at least annually by our CTO on cybersecurity risks and related risk management, which includes topics such as the status of and specific metrics related to our cybersecurity program, recent developments, evolving standards and regulations, vulnerability assessments, third-party and independent reviews, the current threat environment, technology trends, and information security considerations arising with respect to our peers and third parties. Additionally, the Audit Committee receives prompt and ongoing information regarding significant cybersecurity incidents.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2025
Basis of Presentation and Significant Accounting Policies [Abstract]
Basis of Presentation	The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Consolidated Property Partnerships, and all of our wholly-owned and controlled subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Consolidated Property Partnerships, and all of our wholly-owned and controlled subsidiaries. All intercompany balances and transactions have been eliminated in the consolidated financial statements.
Reclassification of Prior Period Amounts	Reclassification of Prior Period Amounts Commencing January 1, 2025, the Company began presenting a new line item, Other income (expense), which includes tax expenses, acquisition and disposition expenses, and income or expenses related to environmental and sustainability initiatives, which were previously included in General and administrative expenses. Historical amounts for General and administrative expenses and Other income (expense) have been revised to conform with the current period presentation, which resulted in no change to consolidated net income. During the year ended December 31, 2025, the Company combined certain line items in the Consolidated Statements of Equity. The Company determined that separate disclosure for certain line items was not meaningful to the users of the financial statements. The settlement of restricted stock units for shares of common stock is now presented net of shares withheld and payments made to settle tax obligations. Historical presentation has been revised to conform with the current period presentation. These presentation changes did not affect the total equity balance, net income, or earnings per share in any of the periods reported.
Partially Owned Entities and Variable Interest Entities	Partially Owned Entities and Variable Interest Entities Our accounting policy is to consolidate entities in which we have a controlling financial interest and significant decision making control over the entity’s operations. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, size of our investment (including loans), authority to control decisions, and contractual and substantive participating rights of the members. In addition to evaluating control rights, we consolidate entities in which the other members have no substantive kick-out rights to remove the Company as the managing member. Entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or the holders of the equity investment at risk do not have a controlling financial interest are variable interest entities (“VIEs”). We evaluate whether an entity is a VIE and whether we are the primary beneficiary. We are deemed to be the primary beneficiary of a VIE when we have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or receive benefits that could potentially be significant to the VIE. The Operating Partnership is a VIE that is consolidated by the Company as the primary beneficiary, as the Operating Partnership is a limited partnership in which the common limited partners do not have substantive kick-out or participating rights. If the requirements for consolidation are not met, the Company would account for investments under the equity method of accounting if we have the ability to exercise significant influence over the entity. Equity method investments would be initially recorded at cost and subsequently adjusted for our share of net income or loss and cash contributions and distributions each period.
Revenue Recognition, Base Rent, Additional Rent - Reimbursements from Tenants, Other Property Income, Uncollectible Lease Receivables and Allowance for Tenant and Deferred Rent Receivables	Revenue Recognition Rental revenue for office, life science, retail, and residential operating properties is our principal source of revenue. We recognize revenue from base rent (fixed lease payments), additional rent (variable lease payments, which consist of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs), parking, and other lease-related revenue once all of the following criteria are met: (i) the agreement has been fully executed and delivered, (ii) services have been rendered, (iii) the amount is fixed or determinable, and (iv) payment has been received or the collectability of substantially all of the amount due is probable. Minimum annual rental revenues are recognized in rental revenues on a straight-line basis over the non-cancellable term of the related lease. Base Rent The timing of when we commence rental revenue recognition for office, life science, and retail properties depends largely on our conclusion as to whether we are or the tenant is the owner of tenant improvements at the leased property for accounting purposes. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements as an asset and commence rental revenue recognition when the tenant takes possession of or controls the finished space, which is generally when tenant improvements being recorded as our assets are substantially complete. In certain instances, when we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, rental revenue recognition begins when the tenant takes possession or controls the physical use of the leased space. The determination of who owns the tenant improvements is made on a lease-by-lease basis and has a significant effect on the timing of commencement of revenue recognition. Further, we may deliver leased space in phases, rather than for an entire building or project, resulting in various revenue commencement dates for a particular lease, which involves significant judgment surrounding when the tenant takes possession of or controls each respective phase, building or project. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements, including costs paid for or reimbursed by the tenants, as our capital asset. For these tenant-funded tenant improvements, we record the amount funded by or reimbursed by tenants as deferred revenue, which is amortized and recognized as rental income on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises. When we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, we record our contribution towards those tenant-owned improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangible assets, net, on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises. For residential properties, we commence revenue recognition upon lease commencement. Residential rental revenue is recognized on a straight-line basis over the term of the related lease, which is generally one year, net of any concessions. When a lease is amended, we determine whether (i) an additional right of use not included in the original lease is being granted as a result of the modification, and (ii) there is an increase in the lease payments that is commensurate with the standalone price for the additional right of use. If both of these conditions are met, the amendment is accounted for as a separate lease contract. If either of those conditions are not met, the amendment is accounted for as a lease modification. Most of our lease amendments are accounted for as modifications of our operating leases, which requires us to reassess both the lease term and fixed lease payments, including any prepaid or deferred rent receivables relating to the original lease, as a part of the lease payments for the modified lease. Termination options in some of our leases allow the tenant to terminate the lease, in part or in whole, prior to the end of the lease term under certain circumstances. Termination options generally require advance notification from the tenant and payment of a termination fee that reimburses us for a portion of the remaining rent under the original lease term and the net book value of lease inception costs such as commissions, tenant improvements and lease incentives. Termination fee income, included in rental income, is recognized on a straight-line basis from the date of the executed termination agreement through the revised lease expiration when the amount of the fee is determinable and collectability of the fee is probable. This fee income is reduced on a straight-line basis by any deferred rent receivable related to the lease. Generally, our leases require the tenant to restore the leased space to standard office condition upon the expiration of the lease. In some circumstances, tenants may negotiate to pay us a restoration fee in lieu of restoring the space. Restoration fee income, included in rental income, is recognized on a straight-line basis from the date of the executed restoration fee agreement through lease expiration when the amount of the fee is determinable and collectability of the fee is probable. When tenants declare bankruptcy, we may be able to collect some portion of their past-due rents through the bankruptcy process, whether through applying security deposit balances, drawing on tenants’ letters of credit, or through bankruptcy settlements. We recognize any amounts collected through the bankruptcy process when cash is received. Additional Rent - Reimbursements from Tenants Leases typically provide for the reimbursement of certain property operating expenses accounted for as additional rent, which consists of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, and is recognized in rental income in the period the recoverable costs are incurred. Additional rent where we pay the associated costs directly to third-party vendors and are reimbursed by our tenants are recognized and recorded on a gross basis, with the associated expense recognized in property expenses or real estate taxes. Other Property Income Other property income primarily includes amounts recorded in connection with transient daily parking, broken deal income, and property damage settlement-related payments in excess of losses incurred received from third-party insurance carriers. Other property income also includes miscellaneous income from tenants and fees for late rental payments. Amounts recorded within other property income fall within the scope of ASC Topic 606 “Revenue from Contracts with Customers” and are recognized as revenue at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied.For leases that are deemed probable of collection, revenue continues to be recorded on a straight-line basis over the non-cancellable lease term, with partial allowances for uncollectible accounts exhibiting a certain level of collection risk. For leases that are deemed not probable of collection, revenue is recorded as the lesser of (i) cash received, or (ii) the amount recognized on a straight-line basis with any tenant and deferred rent receivable balances charged as a direct write-off against rental income in the period of the change in the collectability determination. If the collectability determination subsequently changes to being probable of collection for leases for which revenue is recorded based on cash received from the tenant, we resume recognizing revenue, including deferred revenue, on a straight-line basis and recognize incremental revenue related to the reinstatement of cumulative deferred rent receivable and deferred revenue balances, as if revenue had been recorded on a straight-line basis since the inception of the lease.
Acquisitions	Acquisitions Acquisitions of operating properties and development and redevelopment opportunities generally do not meet the definition of a business and are accounted for as asset acquisitions, as substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. For these asset acquisitions, we record the acquired tangible and intangible assets and assumed liabilities based on each asset’s and liability’s relative fair value compared to the total purchase price plus any capitalized closing costs, including costs incurred during negotiation. Fair values are determined using estimated cash flow projections, market information and discount and/or capitalization rates, considering historical operating results, known and anticipated trends, and market and economic conditions. The acquired assets and assumed liabilities for an acquisition generally include, but are not limited to: (i) land and improvements, buildings and improvements, undeveloped land, and construction in progress, and (ii) identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values, and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at relative fair value on the date of acquisition. The fair value of land and improvements is derived from comparable sales of land and improvements within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements, and leasing costs considers the value of the property as if it was vacant as well as current replacement costs and other relevant market rate information. The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term, and (ii) management’s estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangible assets, net, on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related intangible liabilities, net, on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable. The amortization of a below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented. The amortization of an above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented. The fair value of acquired in-place leases is derived based on management’s assessment of lost revenue and costs incurred for the period required to lease the “assumed vacant” property to the occupancy level when purchased. This fair value is based on a variety of considerations, including, but not necessarily limited to: (i) the value associated with lost rental revenue from existing leases during the assumed lease-up period; (ii) the value associated with avoiding the cost of originating the acquired in-place leases; and (iii) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period. Factors we consider in performing these analyses include an estimate of the carrying costs during the expected lease-up periods, current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance, and other operating expenses, and estimates of lost rental revenue during the expected lease-up periods based on current market demand at market rates. In estimating costs to execute similar leases, we consider leasing commissions, legal, and other related expenses. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangible assets, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases. The determination of the fair value of any debt assumed in connection with a property acquisition is estimated by discounting the future cash flows using market interest rates available for the issuance of debt with similar terms and remaining maturities. The determination of the fair value of the acquired tangible and intangible assets and assumed liabilities of acquisitions requires us to make significant judgments and assumptions about the numerous inputs discussed above. The use of different assumptions in these fair value calculations could significantly affect the reported amounts of the allocation of our acquisition related assets and liabilities and the related depreciation and amortization expense recorded for such assets and liabilities. In addition, because the value of above and below-market leases are amortized as either a reduction or increase to rental income, respectively, our judgments for these intangibles could have a significant impact on our reported rental revenues and results of operations. Transaction costs associated with our acquisitions, including costs incurred during negotiation, are capitalized as part of the purchase price of the acquisition.
Operating Properties, Cost Capitalization, Depreciation and Amortization of Buildings and Improvements	Operating Properties Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and extension of the useful life of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred. Cost Capitalization We capitalize all costs associated with development and redevelopment activities, capital improvements, and tenant improvements as project costs, including internal compensation costs related to those activities. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for their intended use are in progress: pre-construction costs essential to the development of the property, interest costs based on the weighted average interest rate of our outstanding indebtedness for the period, real estate taxes, and insurance. Determining whether expenditures meet the criteria for capitalization requires management to exercise significant judgment. Expenditures that meet one or more of the following criteria generally qualify for capitalization: •Provide benefit in future periods; •Extend the useful life of the asset beyond our original estimates; and •Increase the quality of the asset beyond our original estimates. We define redevelopment properties as those properties for which we expect to spend significant development and construction costs pursuant to a formal plan to change its use, the intended result of which is a higher economic return on the property. We define a property in the tenant improvement phase as a development or redevelopment property where the project has reached “cold shell condition” and is ready for tenant improvements, which may require additional major base building modifications before being placed in service. Projects in the tenant improvement phase are moved into our stabilized portfolio once the project reaches the earlier of 95% occupancy or one year from the date of the cessation of major base building construction activities. For office, life science, and retail development and redevelopment properties, the date the capitalization period ends is based on property-specific leasing activity: •For properties that are pre-leased, we cease capitalization when revenue recognition has commenced on the leased space, which is upon substantial completion of tenant improvements deemed to be the Company’s asset for accounting purposes. •For properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore, we cease capitalization and begin depreciation on the portion of the property for which revenue recognition has commenced on the leased space, but in any event, no later than one year after the cessation of major base building construction activities. Revenue recognition commences on leased space upon substantial completion of the tenant improvements deemed to be the Company’s asset for accounting purposes. We also cease capitalization when activities necessary to prepare the property for its intended use have been suspended. Once major base building construction activities have ceased and the development or redevelopment property (or phases thereof) have been placed in service, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property. Evaluation of Asset Impairment We evaluate our real estate assets, including land held for future development, for potential impairment whenever events or changes in circumstances indicate that the carrying amount of a given asset may not be recoverable. This evaluation is performed property-by-property basis. Factors we use to determine whether an impairment evaluation is necessary include: •low occupancy levels, forecasted low occupancy levels, or near term lease expirations at a specific property; •current period operating or cash flow losses combined with a historical pattern or future projection of potential continued operating or cash flow losses at a specific property; •deterioration in rental rates for a specific property as evidenced by sudden significant rental rate decreases or continuous rental rate decreases over numerous quarters, which could signal a continued decrease in future cash flows for that property; •deterioration of a given rental submarket as evidenced by significant increases in market vacancy and/or negative absorption rates, or continuous increases in market vacancy and/or negative absorption rates over numerous quarters, which could signal a decrease in future cash flows for properties within that submarket; •significant increases in property sales yields, continuous increases in property sales yields over several quarters, or recent property sales at a loss within a given submarket, each of which could signal a decrease in the market value of properties; •significant change in strategy or use of a specific property, or any other event that could result in a decreased holding period, including classifying a property as held for sale, or significant development delay; •evidence of material physical damage to the property; and •default by a significant tenant when any of the other indicators above are present. When evaluating operating real estate assets to be held and used for potential impairment, including land held for future development, we first evaluate whether there are any indicators of impairment. If any impairment indicators are present for a specific real estate asset, we compare the asset’s net carrying amount to its estimated undiscounted future cash flows over the anticipated holding period. If the carrying amount exceeds these cash flows, we calculate an impairment loss by comparing the carrying amount to the asset’s estimated fair value, using discounted cash flow models or third-party appraisals. An impairment loss recognized sets a new cost basis for the asset, which is then depreciated over its remaining useful life. Assets held for sale are carried at the lower of carrying value or fair value less closing costs, and depreciation ceases. Depreciation and Amortization of Buildings and Improvements and Furniture, Fixtures, and Other Long-Lived Assets The costs of buildings and improvements, tenant improvements, and furniture, fixtures and other long-lived assets are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents We consider all highly-liquid investments, including certificates of deposit, with original maturities of three months or less to be cash equivalents. Restricted Cash Restricted cash consists of cash proceeds from dispositions that are temporarily held at qualified intermediaries for purposes of facilitating potential Section 1031 Exchanges, and cash held in escrow related to acquisition and disposition holdbacks. Restricted cash may also include cash held as collateral to provide credit enhancement for the Operating Partnership’s mortgage debt, including cash reserves for capital expenditures, tenant improvements, and property taxes.
Deferred Compensation Plan	At the time eligible management employees (“Participants”) defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the marketable securities held in connection with the Deferred Compensation Plan generally offset and therefore do not significantly impact net income.
Deferred Financing Costs and Debt Discounts and Premiums	Deferred Financing Costs Financing costs related to the origination or assumption of long-term debt are deferred and generally amortized into interest expense using the straight-line method of accounting, which approximates the effective interest method, over the contractual terms of the applicable financings. Deferred financing costs incurred in connection with the establishment of the unsecured revolving credit facility are initially recorded as prepaid assets on the balance sheet and subsequently amortized to interest expense over the contractual term of the facility, typically using the straight-line method. Debt Discounts and Premiums Original issuance debt discounts and discounts/premiums related to recording debt acquired in connection with operating property acquisitions at fair value are generally amortized and accreted on a straight-line basis, which approximates the effective interest method. Discounts are recorded as additional interest expense from date of issuance or acquisition through the contractual maturity date of the related debt. Premiums are recorded as a reduction to interest expense from the date of issuance or acquisition through the contractual maturity date of the related debt.
Noncontrolling Interests and Common Partnership Interests	Noncontrolling Interests - Common Units of the Operating Partnership in the Company’s Consolidated Financial Statements Common units of the Operating Partnership within noncontrolling interests in the Company’s consolidated financial statements represent the common limited partnership interests in the Operating Partnership not held by the Company (“noncontrolling common units”). Noncontrolling common units are presented in the equity section of the Company’s consolidated balance sheets and are reported at their proportionate share of the net assets of the Operating Partnership. Noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or shares of common stock must be further evaluated to determine whether equity or temporary equity classification on the balance sheet is appropriate. Since the common units contain such a provision, we evaluated the accounting guidance and determined that the common units qualify for equity presentation in the Company’s consolidated financial statements. Net income attributable to noncontrolling common units is allocated based on their relative ownership percentage of the Operating Partnership during the reported period. The noncontrolling interest ownership percentage is determined by dividing the number of noncontrolling common units by the total number of common units outstanding. The issuance or redemption of additional shares of common stock or common units results in changes to the noncontrolling interest percentage as well as the total net assets of the Company. As a result, all equity transactions result in an allocation between equity and the noncontrolling interest in the Company’s consolidated balance sheets and statements of equity to account for the changes in the noncontrolling interest ownership percentage as well as the change in total net assets of the Company. Noncontrolling Interests in Consolidated Property Partnerships Noncontrolling interests in consolidated property partnerships represent the equity interests held by unrelated third parties in our three consolidated property partnerships (see Note 10 “Noncontrolling Interests on the Company’s Consolidated Financial Statements” and see Note 11 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements”). Noncontrolling interests in consolidated property partnerships are not redeemable and are presented as permanent equity in the Company’s consolidated balance sheets. We account for the noncontrolling interests in consolidated property partnerships using the hypothetical liquidation at book value (“HLBV”) method to attribute the earnings or losses of the consolidated property partnerships between the controlling and noncontrolling interests. Under the HLBV method, the amounts reported as noncontrolling interests in consolidated property partnerships in the consolidated balance sheets represent the amounts the noncontrolling interests would hypothetically receive at each balance sheet reporting date under the liquidation provisions of the governing agreements assuming the net assets of the consolidated property partnerships were liquidated at recorded amounts and distributed between the controlling and noncontrolling interests in accordance with the governing documents. The net income attributable to noncontrolling interests in consolidated property partnerships in the consolidated statements of operations is associated with the increase or decrease in the noncontrolling interest holders’ contractual claims on the respective entities’ balance sheets assuming a hypothetical liquidation at the end of that reporting period when compared with their claims on the respective entities’ balance sheets assuming a hypothetical liquidation at the beginning of that reporting period, after removing the impact of any contributions or distributions. Common Partnership Interests on the Operating Partnership’s Consolidated Balance Sheets The common units held by the Company and the noncontrolling common units held by the common limited partners are both presented in the permanent equity section of the Operating Partnership’s consolidated balance sheets in partners’ capital. The redemption rights of the noncontrolling common units permit us to settle the redemption obligation in either cash or shares of the Company’s common stock at our option (see Note 10 “Noncontrolling Interests on the Company’s Consolidated Financial Statements” for additional information). Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements Noncontrolling interests in the Operating Partnership’s consolidated financial statements include the noncontrolling interest in property partnerships (See Note 11 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements”).
Equity Offerings	Equity Offerings Underwriting commissions and offering costs incurred in connection with common equity offerings and any at-the-market stock offering programs (See Note 12 “Stockholders’ Equity of the Company”) are reflected as a reduction of additional paid-in capital. The net proceeds from any equity offering of the Company are generally contributed to the Operating Partnership in exchange for a number of common units equivalent to the number of shares of common stock issued and are reflected in the Operating Partnership’s consolidated financial statements as an increase in partners’ capital.
Share-based Incentive Compensation Accounting	Share-Based Incentive Compensation Accounting Compensation cost for all share-based awards requires measurement at estimated fair value on the grant date. Compensation cost is recognized on a straight-line basis over the requisite service period. The grant date fair value of share-based awards with market conditions are calculated using a Monte Carlo simulation pricing model. Forfeitures of all share-based awards are recognized when they occur. For share-based awards in which the performance period precedes the grant date, we recognize compensation cost over the requisite service period, which includes both the performance and service vesting periods, using the accelerated attribution expense method. The requisite service period begins on the date the Executive Compensation Committee authorizes the award and adopts any relevant performance measures. For share-based awards with performance conditions, the total estimated compensation cost is based on our most recent estimate of the probable achievement of the pre-established specific performance measures. These estimates are based on actual results and our latest internal forecasts for each performance measure. For share-based awards with market conditions, the total estimated compensation cost is based on the fair value of the award at the grant date. For share-based awards with performance conditions and market conditions, the total estimated compensation cost is based on the fair value per share at the grant date multiplied by our most recent estimate of the number of shares to be earned based on actual results and the probable achievement of the pre-established corporate performance measures based on our latest internal forecasts. In accordance with the provisions of our share-based incentive compensation plan, we accept the return of shares of Company common stock, at the current quoted market price, from employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period. For share-based awards granted by the Company, the Operating Partnership issues a number of common units equal to the number of shares of common stock ultimately granted by the Company in respect of such awards.
Basic and Diluted Net Income Available to Common Stockholders per Share	Basic and Diluted Net Income Available to Common Stockholders per Share Basic net income available to common stockholders per share is computed by dividing net income available to common stockholders after the allocation of income to participating securities, by the weighted-average number of shares of common stock outstanding for the period. Diluted net income available to common stockholders per share is computed by dividing net income available for common stockholders, after the allocation of income to participating securities, by the sum of the weighted-average number of shares of common stock outstanding for the period plus the assumed exercise of all dilutive securities. The impact of the outstanding common units is considered in the calculation of diluted net income available to common stockholders per share. The common units are not reflected in the diluted net income available to common stockholders per share calculation because the exchange of common units into common stock is on a one for one basis, and the common units are allocated net income on a per share basis equal to the common stock (See Note 19 “Net Income Available to Common Stockholders Per Share of the Company”). Accordingly, any exchange would not have any effect on diluted net income (loss) available to common stockholders per share. Share-based payment awards (primarily vested restricted stock units (“RSUs”)) containing nonforfeitable rights to dividends or dividend equivalents are accounted for as participating securities and included in the computation of basic and diluted net income available to common stockholders per share pursuant to the two-class method. The dilutive effect of shares issuable under executed forward equity sale agreements, if any, are reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. The dilutive effect of the outstanding nonvested shares of common stock (“nonvested shares”) and RSUs that have not yet been vested but are contingently issuable under the share-based compensation programs is reflected in the weighted average diluted shares calculation by application of the treasury stock method. Basic and Diluted Net Income Available to Common Unitholders per Unit Basic net income available to common unitholders per unit is computed by dividing net income available to the general partner and common unitholders, after the allocation of income to participating securities, by the weighted-average number of vested common units outstanding for the period. Diluted net income available to common unitholders per unit is computed by dividing net income available to the general partner and common unitholders, after the allocation of income to participating securities, by the sum of the weighted-average number of common units outstanding for the period plus the assumed exercise of all dilutive securities. The dilutive effect of outstanding nonvested shares, RSUs, awards containing nonforfeitable rights to dividend equivalents and shares issuable under executed forward equity sale agreements, if any, are reflected in diluted net income available to the general partner and common unitholders per unit in the same manner as noted above for net income available to common stockholders per share.
Fair Value Measurements	Fair Value Measurements The marketable securities held in connection with our Deferred Compensation Plan are recorded at fair value on a recurring basis in our consolidated financial statements. All other financial instruments of the Company, with the exception of our secured and unsecured debt instruments which are disclosed in Note 18 “Fair Value Measurements and Disclosures” to our consolidated financial statements, are recorded at amounts which, in management’s judgment, reasonably approximate their fair values. We elected not to apply the fair value option for any of our eligible financial instruments or other items. We determine the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy: •Level 1 – quoted prices for identical instruments in active markets; •Level 2 – quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and •Level 3 – fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. We determine the fair value for the marketable securities using quoted prices in active markets for identical assets. Our other financial instruments, which are only disclosed at fair value, are comprised of certificates of deposit, secured debt, unsecured senior notes, unsecured revolving credit facility, and unsecured term loan facility. We generally determine the fair value of our secured debt, unsecured senior notes, unsecured revolving credit facility, and unsecured term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. For our fixed-rate debt instruments, including our secured debt and unsecured senior notes, we calculate the market rate by obtaining period-end treasury rates for maturities that correspond to the maturities of our fixed-rate debt and then adding an appropriate credit spread based on information obtained from third-party financial institutions. These credit spreads take into account factors, including, but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan-to-value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flows. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period, if such prices are available. For our floating-rate debt instruments, including our unsecured line of credit agreement and unsecured term loan, we calculate the market rate by obtaining Adjusted SOFR and then adding an appropriate credit spread based on our credit ratings.
Income Taxes	Income Taxes We have elected to be taxed as a REIT under Sections 856 through 860 of the Code. To qualify as a REIT, we must distribute annually at least 90% of our adjusted taxable income, as defined in the Code, to our stockholders and satisfy certain other organizational and operating requirements. We generally will not be subject to federal income taxes if we distribute 100% of our taxable income for each year to our stockholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income taxes on our taxable income at regular corporate rates and we may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to federal income taxes and excise taxes on our undistributed taxable income. We believe that we have met all of the REIT distribution and technical requirements for the years ended December 31, 2025, 2024, and 2023, and we were not subject to any federal income taxes (See Note 22 “Tax Treatment of Distributions” for additional information). We intend to continue to adhere to these requirements and maintain the Company’s REIT status. Accordingly, no provision for federal income taxes has been made in the accompanying financial statements. In addition, any taxable income from our taxable REIT subsidiaries are subject to federal, state, and local income taxes. For the years ended December 31, 2025, 2024, and 2023 the taxable REIT subsidiaries had de minimis taxable income.
Uncertain Tax Positions	Uncertain Tax Positions We include favorable tax positions in the calculation of tax liabilities if it is more likely than not that our adopted tax position will prevail if challenged by tax authorities. We evaluated the potential impact of identified uncertain tax positions for all tax years still subject to audit under state and federal income tax law and concluded that we did not have any unrecognized tax benefits or any additional tax liabilities as of December 31, 2025 or 2024. As of December 31, 2025, the years still subject to audit are 2021 through 2025 under the California state income tax law, 2023 through 2025 under the Texas state income tax law and 2022 through 2025 under the federal income tax law.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates.
Segments	Segments We currently operate as one reportable segment. See Note 23 “Segments” for additional information.
Concentration of Credit Risk	Concentration of Credit Risk All of our business is currently conducted in the state of California, with the exception of the ownership and operation of ten stabilized office properties and one future development project located in the state of Washington, and one stabilized office property and one future development project located in Austin, Texas. The ability of tenants to honor the terms of their leases is dependent upon the economic, regulatory, and social factors affecting the communities in which our tenants operate. We have deposited cash with financial institutions that is insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per institution. As of December 31, 2025 and 2024, we had cash accounts in excess of FDIC insured limits.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Accounting Pronouncements Adopted January 1, 2025 In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-09 “Income Taxes (Topic 740): Improvements to Tax Disclosures.” The ASU is effective for annual periods beginning after December 15, 2024. The guidance did not have a material impact on our consolidated financial statements or notes to our consolidated financial statements. Accounting Pronouncements Effective 2026 and Beyond In November 2024, the FASB issued ASU 2024-03 “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” The ASU is effective for annual periods beginning after December 15, 2026. The Company is currently evaluating whether the guidance will have a material impact on our consolidated financial statements or notes to our consolidated financial statements.

Organization and Ownership (Tables)

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Real Estate Properties

Our stabilized portfolio of operating properties was comprised of the following properties at December 31, 2025:


	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percentage Occupied (unaudited) (1)
Stabilized Office Properties (2)	121	16,292,164	438	81.6	%

_______________________

(1)Represents economic occupancy for space where we have achieved revenue recognition for the associated lease agreements.

(2)Includes stabilized life science and retail space.


	Number of Properties	Number of Units	2025 Average Occupancy (unaudited)
Stabilized Residential Properties	3	1,001	94.1	%

As of December 31, 2025, the following projects were excluded from our stabilized portfolio:


	Number of Properties / Projects	Actual / Estimated Rentable Square Feet (unaudited) (1)
Properties held for sale (2)	1	427,764
In-process development project - tenant improvement	1	871,738

____________________

(1)For the property classified as held for sale, represents actual rentable square feet and consists of three buildings. For the in-process development project in the tenant improvement phase, represents estimated rentable square feet upon completion.

(2)See Note 4 “Dispositions and Held For Sale” for additional information.

Schedule of Consolidated Property Partnership Ownership Percentage

Consolidated Property Partnership

Property Address

Ownership Interest (1) (2)

100 First Street Member, LLC

100 1st Street, San Francisco, CA 94105

56%

303 Second Street Member, LLC

303 2nd Street, San Francisco, CA 94107

56%

Redwood City Partners, LLC

900 Jefferson Avenue, Redwood City, CA 94063

93%

900 Middlefield Road, Redwood City, CA 94063

________________________

(1)Reflects the Company’s ownership percentage at time of agreement. Actual percentage may vary depending on cash flows or promote structure.

(2)The remaining interests in all three property partnerships were owned by unrelated third parties.

Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Basis of Presentation and Significant Accounting Policies [Abstract]

Schedule of Total Assets, Liabilities, and Noncontrolling Interest

The following table summarizes the total assets, liabilities, and noncontrolling interests included on our consolidated balance sheets attributable to these VIEs:


	December 31, 2025		December 31, 2024
	($ in thousands)
Number of VIEs	2		3
Total assets (1)	$	380,940	$	435,478
Total liabilities	$	18,304	$	18,047
Total noncontrolling interests	$	160,299	$	169,445

____________________

(1)Includes $319.4 million and $357.3 million related to real estate assets held for investment, net, as of December 31, 2025 and 2024, respectively.

Schedule of Buildings, Improvements, and Tenant Improvements Depreciation

Depreciation expense for buildings and improvements for the three years ended December 31, 2025, 2024, and 2023 was $305.8 million, $308.0 million, and $300.1 million, respectively:


Asset Description						Depreciable Lives
Buildings and improvements (1)						25 – 40 years
Tenant improvements (2)						1 - 20 years
Furniture, fixtures, and other long-lived assets (3)						1 - 5 years

____________________

(1)Building improvements associated with in-process capital improvement projects begin depreciation once placed in service.

(2)Tenant improvements are amortized over the shorter of the lease term or the estimated useful life.

(3)Accumulated depreciation for furniture, fixtures, and other long-lived assets is included in “Prepaid expense and other assets, net” on our consolidated balance sheets.

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2025

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Schedule of Acquisitions

During the years ended December 31, 2025 and 2024, we acquired the operating properties listed below from unrelated third parties:


Property	Month of Acquisition	Number of Buildings	Rentable Square Feet (Unaudited)	Purchase Price (in millions) (1)
2025 Acquisitions
3530 & 3550 John Hopkins Court and 3535 & 3565 General Atomics Court (Nautilus)	December	4	232,166	$	192.0
335-345 N. Maple Drive (Maple Plaza)	September	1	306,366	205.3
Total 2025 Acquisitions		5	538,532	$	397.3

2024 Acquisitions
12707 & 12777 High Bluff Drive (One Paseo Junction)	September	2	103,731	$	35.0
Total 2024 Acquisitions		2	103,731	$	35.0

________________________

(1)Excludes closing costs and purchase price credits.

Schedule of Estimated Fair Values of the Assets Acquired and Liabilities Assumed

The following table summarizes the estimated relative fair values of the assets acquired and liabilities assumed as of the date of acquisition, net of credits, and excluding acquisition-related costs of $0.8 million:


	Total 2025 Operating Property Acquisitions		Total 2024 Operating Property Acquisitions
	(in thousands)
Assets
Land	$	50,382	$	6,000
Buildings and improvements	287,563		15,703
Deferred leasing costs and acquisition-related intangible assets (1)	61,454		13,534
Prepaid expenses and other assets, net	—		30
Total assets acquired	$	399,399	$	35,267
Liabilities
Acquisition-related intangible liabilities (2)	$	2,981	$	267
Total liabilities assumed	2,981		267
Net assets and liabilities acquired	$	396,418	$	35,000

________________________

(1)For the 2025 operating property acquisitions, represents in-place leases (approximately $46.6 million with a weighted average amortization period of 4.4 years), leasing commissions (approximately $7.9 million with a weighted average amortization period of 4.7 years), and above-market leases (approximately $7.0 million with a weighted average amortization period of 4.7 years). For the 2024 operating property acquisitions, represents in-place leases (approximately $10.5 million with a weighted average amortization period of 4.7 years), leasing commissions (approximately $2.0 million with a weighted average amortization period of 4.9 years), and an above-market lease (approximately $1.0 million with a weighted average amortization period of 4.6 years).

(2)For the 2025 operating property acquisitions, represents below-market leases (approximately $3.0 million with a weighted average amortization period of 3.3 years). For the 2024 operating property acquisitions, represents below-market leases (approximately $0.3 million with a weighted average amortization period of 4.9 years).

Dispositions and Real Estate Held For Sale (Tables)

12 Months Ended

Dec. 31, 2025

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Operating Properties and Land Dispositions

The following table summarizes the operating properties sold during the year ended December 31, 2025:


Location	Month of Disposition	Number of Buildings	Rentable Square Feet (unaudited)	Sales Price (in millions) (1)
2025 Dispositions
501 Santa Monica Boulevard, Santa Monica, CA (2)	June	1	78,509	$	40.0
Silicon Valley Campus, CA (2)	September	4	663,460	365.0
6255 W. Sunset Boulevard, Los Angeles, CA (Sunset Media Center) (3)	December	1	325,772	61.0
Total 2025 Dispositions		6	1,067,741	$	466.0

____________________

(1)Represents gross sales price before broker commissions, closing costs, and purchase price credits.

(2)The total gains on the sales of the operating properties sold during the year ended December 31, 2025 was $127.0 million.

(3)During the three months and year ended December 31, 2025, we recognized an impairment charge of approximately $16.3 million to reduce the carrying amount of this property to its current fair value less closing costs.

The major classes of assets and liabilities of the property classified as held for sale as of December 31, 2025 were as follows:


Real estate and other assets held for sale, net	(in thousands)
Land	$	23,158
Buildings and improvements	198,535
Total real estate assets held for sale	221,693
Accumulated depreciation and amortization	(116,693)
Total real estate assets held for sale, net	105,000
Current receivables, net	598
Deferred rent receivables, net	5,433
Deferred leasing costs and acquisition-related intangible assets, net	3,939
Prepaid expenses and other assets, net	185
Total real estate and other assets held for sale, net	$	115,155

Liabilities related to real estate assets held for sale
Accounts payable, accrued expenses, and other liabilities	$	663
Deferred revenue and acquisition-related intangible liabilities, net	1,882
Rents received in advance and tenant security deposits	2,400
Total liabilities related to real estate assets held for sale	$	4,945

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

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+ Details

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Identified Deferred Leasing Costs and Acquisition-Related Intangible Assets

The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, and in-place leases) and acquisition-related intangible liabilities (acquired value of below-market operating leases):


	December 31, 2025		December 31, 2024
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:	(in thousands)
Deferred leasing costs	$	310,936	$	303,541
Accumulated amortization	(131,985)		(136,171)
Deferred leasing costs, net	178,951		167,370
Above-market operating leases	8,239		1,269
Accumulated amortization	(779)		(156)
Above-market operating leases, net	7,460		1,113
In-place leases	123,329		78,979
Accumulated amortization	(31,508)		(21,525)
In-place leases, net	91,821		57,454



Total deferred leasing costs and acquisition-related intangible assets, net	$	278,232	$	225,937
Acquisition-related Intangible Liabilities, net (1):
Below-market operating leases	$	41,292	$	38,413
Accumulated amortization	(14,613)		(10,995)
Below-market operating leases, net	26,679		27,418



Total acquisition-related intangible liabilities, net	$	26,679	$	27,418

____________________

(1)Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets. Refer to Note 9 “Deferred Revenue and Acquisition-Related Intangible Liabilities, net” for a detailed breakdown of this line item .

Schedule of Amortization for the Period Related to Deferred Leasing Costs and Acquisition-Related Intangibles

The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Deferred leasing costs	$	31,670	$	34,135	$	31,771
Above-market operating leases	645		86		31
In-place leases	12,122		7,453		15,878
Below-market operating leases	(3,724)		(3,607)		(6,679)
Total	$	40,713	$	38,067	$	41,001

Schedule of Estimated Annual Amortization Related to Deferred Leasing Costs and Acquisition-Related Intangibles

The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2025 for future periods:


	Deferred Leasing Costs		Above-Market Operating Leases		In-Place Leases		Below-Market Operating Leases
Year Ending	(in thousands)
2026	$	32,410	$	1,809	$	21,138	$	(4,530)
2027	28,802		1,620		16,914		(4,075)
2028	26,406		1,520		14,792		(3,739)
2029	22,950		1,371		12,083		(2,976)
2030	19,717		893		8,487		(2,593)
Thereafter	48,666		247		18,407		(8,766)
Total	$	178,951	$	7,460	$	91,821	$	(26,679)

____________________

(1)Refer to Note 2 “Basis of Presentation and Significant Accounting Policies” for presentation in the consolidated statements of operation

Prepaid Expenses and Other Assets, net (Tables)

12 Months Ended

Dec. 31, 2025

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Assets, Net

Prepaid expenses and other assets, net, consisted of the following:


	December 31, 2025		December 31, 2024
	(in thousands)
Furniture, fixtures, and other long-lived assets, net (1)	$	29,179	$	26,316
Prepaid expenses, net	11,000		8,470
Deferred financing costs, net (2)	9,150		12,692
Other assets	5,232		4,457

Total prepaid expenses and other assets, net	$	54,561	$	51,935

____________________

(1)Includes $43.4 million and $40.2 million of accumulated depreciation for furniture, fixtures, and other long-lived assets as of as of December 31, 2025 and 2024, respectively.

(2)Refer to Note 8 “Secured and Unsecured Debt of the Operating Partnership” for a discussion of the deferred financing costs for the unsecured revolving credit facility.

Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty L.P.

12 Months Ended

Dec. 31, 2025

Debt Instrument [Line Items]

Schedule of Unsecured Revolving Credit and Term Loan Facility

The following table summarizes the balance and terms of our unsecured revolving credit facility:


	Unsecured Revolving Credit Facility
	December 31, 2025			December 31, 2024
	($ in thousands)
Outstanding borrowings	$	—		$	—
Remaining borrowing capacity (1)	1,100,000			1,100,000
Total borrowing capacity (1)	$	1,100,000		$	1,100,000
Interest rate (2)	5.07		%	5.69		%
Annual facility fee (3)	0.250%
Unamortized deferred financing costs (3)	$	9,150		$	12,692
Maturity date (4)	July 31, 2028

____________________

(1)Remaining and total borrowing capacity are further reduced by the amount of our outstanding letters of credit which total approximately $5.2 million as of December 31, 2025 and December 31, 2024. We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $500.0 million under an accordion feature pursuant to the terms of the unsecured revolving credit facility.

(2)Our unsecured revolving credit facility interest rate was calculated using the Secured Overnight Financing Rate (“SOFR”) plus a SOFR adjustment of 0.10% (together “Adjusted SOFR”) and a margin of 1.100% based on our credit rating as of December 31, 2025 and 2024. We may be entitled to a temporary 0.01% reduction in the interest rate provided we meet certain sustainability goals with respect to the ongoing reduction of greenhouse gas emissions.

(3)Our annual facility fee is paid on a quarterly basis and is calculated based on total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs in connection with the amendment and restatement of the unsecured revolving credit facility in 2024. These costs are included in Prepaid expenses and other assets, net on our consolidated balance sheets, and will continue to be amortized through the maturity date of our unsecured revolving credit facility.

(4)The maturity date may be extended by two six-month periods, at the Operating Partnership’s election.

The following table summarizes the balance and terms of our 2024 Term Loan Facility:


	2024 Term Loan Facility
	December 31, 2025			December 31, 2024
	($ in thousands)
Outstanding borrowings (1)	$	200,000		$	200,000
Interest rate (2)	5.02		%	5.70		%
Unamortized deferred financing costs (3)	$	277		$	1,229
Maturity date (4)	October 3, 2026			October 3, 2025

____________________

(1)We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $130.0 million, under an accordion feature pursuant to the terms of the 2024 Term Loan Facility, as of December 31, 2025.

(2)Our 2024 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 1.200% based on our credit rating as of December 31, 2025 and 2024.

(3)We incurred debt origination and legal costs in connection with the amendment and restatement of the 2024 Term Loan Facility in 2024, which remain to be amortized through the maturity date. Additionally, in connection with extending the maturity date in September 2025, we incurred additional costs which will continue to be amortized through the extended maturity date of the 2024 Term Loan Facility.

(4)During the year ended December 31, 2025, we exercised our option to extend the maturity date by 12 months to October 3, 2026. The maturity date may be extended by an additional 12-month period, at the Operating Partnership’s election.

Schedule of Debt Maturities

The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of December 31, 2025:


Year	(in thousands)
2026	$	601,317
2027	249,125
2028	400,000
2029	475,000
2030	500,000
Thereafter	2,400,000
Total aggregate principal value	$	4,625,442
Less: unamortized net discounts and deferred financing costs (1)	(35,983)
Total debt, net	$	4,589,459

________________________

(1) Includes $25.0 million of unamortized deferred financing costs for the unsecured term loan facility, unsecured senior notes, and secured debt, and $11.0 million of unamortized discounts for the unsecured senior notes. Excludes unamortized deferred financing costs on the unsecured revolving credit facility, which are included in Prepaid expenses and other assets, net on our consolidated balance sheets.

Schedule of Capitalized Interest and Loan Fees

The following table sets forth our gross interest expense and capitalized interest. The interest expense capitalized was recorded as a cost of development and redevelopment and increased the carrying value of undeveloped land and construction in progress currently under construction:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Gross interest expense	$	211,379	$	227,748	$	192,983
Capitalized interest	(85,087)		(82,461)		(78,767)
Interest expense	$	126,292	$	145,287	$	114,216

Secured debt

Debt Instrument [Line Items]

Schedule of Debt Balance and Significant Terms

The following table sets forth the composition of our secured debt:


	Annual Stated Interest Rate (1)	GAAP Effective Rate (1) (2)	Maturity Date
				December 31, 2025		December 31, 2024
Type of Debt				(in thousands)
Mortgage note payable	3.57%	3.80%	December 2026	$	148,815	$	152,668
Mortgage note payable	4.48%	4.57%	July 2027	76,627		79,020
Mortgage note payable	5.90%	6.13%	August 2034	375,000		375,000
Total secured debt (3)				$	600,442	$	606,688
Unamortized deferred financing costs				(7,757)		(8,489)
Total secured debt, net				$	592,685	$	598,199

____________________

(1)All interest rates presented are fixed-rate interest rates.

(2)Represents the effective interest rate including the amortization of initial issuance discounts and deferred financing costs.

(3)The secured debt and the related properties that secure this debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

Unsecured Senior Notes

Debt Instrument [Line Items]

Schedule of Debt Balance and Significant Terms

The following table summarizes the balance and significant terms of the unsecured senior notes issued by the Operating Partnership and outstanding, including unamortized discounts and unamortized deferred financing costs:


	Maturity Date	Stated Coupon Rate	Effective Interest Rate (1) (2)	December 31, 2025		December 31, 2024
				(in thousands)
Private Placement Notes
Unsecured Senior Notes	July 2026	4.300%	4.389%	$	50,000	$	50,000
Unsecured Senior Notes	October 2026	4.350%	4.437%	200,000		200,000
Unsecured Senior Notes	February 2027	3.350%	3.416%	175,000		175,000
Unsecured Senior Notes	February 2029	3.450%	3.507%	75,000		75,000
Unsecured Senior Notes	January 2031	4.270%	4.322%	350,000		350,000
Public Notes
Unsecured Senior Notes	October 2025	4.375%	4.444%	—		400,000
Unsecured Senior Notes	December 2028	4.750%	4.874%	400,000		400,000
Unsecured Senior Notes	August 2029	4.250%	4.383%	400,000		400,000
Unsecured Senior Notes	February 2030	3.050%	3.168%	500,000		500,000
Unsecured Senior Notes	November 2032	2.500%	2.626%	425,000		425,000
Unsecured Senior Notes	November 2033	2.650%	2.727%	450,000		450,000
Unsecured Senior Notes	October 2035	5.875%	6.076%	400,000		—
Unsecured Senior Notes	January 2036	6.250%	6.412%	400,000		400,000
Total Unsecured Senior Notes				$	3,825,000	$	3,825,000
Less: Unamortized Net Discounts and Deferred Financing costs				(27,949)		(24,205)
Total Unsecured Senior Notes, Net (3)				$	3,797,051	$	3,800,795

____________________

(1)Represents the effective interest rate including the amortization of initial issuance discounts and deferred financing costs.

(2)Interest on unsecured senior notes is payable semi-annually.

(3)Includes unamortized discounts of $11.0 million and $8.4 million and unamortized deferred financing costs of $16.9 million and $15.8 million as of December 31, 2025 and December 31, 2024, respectively.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Deferred Revenue and Acquisition-Related Intangible Liabilities, net (Tables)

12 Months Ended

Dec. 31, 2025

Revenue from Contract with Customer [Abstract]

Schedule of Deferred Revenue and Acquisition-Related Liabilities

Deferred revenue and acquisition-related intangible liabilities, net consisted of the following:


	December 31, 2025		December 31, 2024
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements, net	$	70,813	$	81,738
Other deferred revenue, net (1)	28,136		33,281
Acquisition-related intangible liabilities, net (2)	26,679		27,418
Total	$	125,628	$	142,437

_____________________

(1)Represents cash received in advance of revenue recognition, net of accumulated amortization.

(2)See Note 5 “Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net” for additional information regarding our acquisition-related intangible liabilities.

Schedule of Estimated Amortization of Deferred Revenue Related to Tenant-Funded Improvements

The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2025 for the next five years and thereafter:


Year Ending	(in thousands)
2026	$	12,933
2027	11,619
2028	10,457
2029	9,726
2030	9,037
Thereafter	17,041
Total	$	70,813

Stockholders' Equity of the Company (Tables)

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Schedule of Accrued Dividends and Distributions

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock and noncontrolling units:


	December 31, 2025		December 31, 2024
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	63,921	$	63,745
Noncontrolling common unitholders of the Operating Partnership	612		621
RSU holders (1)	476		484
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	$	65,009	$	64,850

_____________________

(1)The amount includes the value of the dividend equivalents that will be paid with additional RSUs (See Note 14 “Share-Based and Other Compensation” for additional information).

Schedule of Outstanding Shares of Common Stock, Preferred Stock and Noncontrolling Units


	December 31, 2025	December 31, 2024
Outstanding Shares and Units:
Common stock	118,372,451	118,046,674
Noncontrolling common units	1,133,562	1,150,574
RSUs (1)	846,072	861,385

_____________________

(1)The amount includes nonvested RSUs. Does not include 1,394,111 and 926,695 performance-based RSUs because not all the necessary performance conditions have been met as of December 31, 2025 and 2024, respectively. Refer to Note 14 “Share-Based and Other Compensation” for additional information.

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

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+ Details

Partners' Capital of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2025

Class of Stock [Line Items]

Schedule of Accrued Dividends and Distributions

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock and noncontrolling units:


	December 31, 2025		December 31, 2024
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	63,921	$	63,745
Noncontrolling common unitholders of the Operating Partnership	612		621
RSU holders (1)	476		484
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	$	65,009	$	64,850

_____________________

(1)The amount includes the value of the dividend equivalents that will be paid with additional RSUs (See Note 14 “Share-Based and Other Compensation” for additional information).

Schedule of Outstanding Shares of Common Stock, Preferred Stock and Noncontrolling Units


	December 31, 2025	December 31, 2024
Outstanding Shares and Units:
Common stock	118,372,451	118,046,674
Noncontrolling common units	1,133,562	1,150,574
RSUs (1)	846,072	861,385

_____________________

(1)The amount includes nonvested RSUs. Does not include 1,394,111 and 926,695 performance-based RSUs because not all the necessary performance conditions have been met as of December 31, 2025 and 2024, respectively. Refer to Note 14 “Share-Based and Other Compensation” for additional information.

Kilroy Realty L.P.

Class of Stock [Line Items]

Schedule of Redeemable Noncontrolling Interest

The following table sets forth the number of common units held by the Company as the general partner and the number of common units held by non-affiliated investors in the form of common limited partner units as well as the ownership interest held on each respective date:


	December 31, 2025		December 31, 2024
Company owned common units in the Operating Partnership	118,372,451		118,046,674
Company owned general partnership interest	99.1	%	99.0	%
Non-affiliated investors and other common units of the Operating Partnership	1,133,562		1,150,574
Ownership interest of limited partnership interests	0.9	%	1.0	%

Schedule of Accrued Dividends and Distributions

The following tables summarize accrued distributions for the noted common units:


	December 31, 2025		December 31, 2024
	(in thousands)
Distributions payable to:
General partner	$	63,921	$	63,745
Common limited partners	612		621
RSU holders (1)	476		484
Total accrued distributions to common unitholders	$	65,009	$	64,850

_____________________

(1)The amount includes the value of the dividend equivalents that will be paid with additional RSUs (See Note 14 “Share-Based and Other Compensation” for additional information).

Schedule of Outstanding Shares of Common Stock, Preferred Stock and Noncontrolling Units


	December 31, 2025	December 31, 2024
Outstanding Units:
Common units held by the general partner	118,372,451	118,046,674
Common units held by the limited partners	1,133,562	1,150,574
RSUs (1)	846,072	861,385

_____________________

(1)Does not include 1,394,111 and 926,695 performance-based RSUs because not all the necessary performance conditions have been met as of December 31, 2025 and 2024, respectively. Refer to Note 14 “Share-Based and Other Compensation” for additional information.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

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+ Details

Share-Based and Other Compensation (Tables)

12 Months Ended

Dec. 31, 2025

2022, 2021 and 2020 Performance-Based RSUs

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Restricted Stock Units Valuation Assumptions

The following table summarizes the estimated number of RSUs earned for the 2025 and 2024 Performance-

Based RSUs and the actual number of RSUs earned for the 2023 Performance-Based RSUs and the assumptions utilized in the Monte Carlo simulation pricing models:


	2025		2024		2023
Service vesting period	February 14, 2025 - January, 2028		February 1, 2024 - January, 2027		February 6, 2023 - January, 2026
Performance measurement period	January 1, 2025 - December 31, 2027		January 1, 2024 - December 31, 2026		January 1, 2023 - December 31, 2025
Target RSUs granted	308,671		265,205		300,007
Estimated RSUs earned net of forfeitures (1)	472,942		474,214		729,890
Fair Value Assumptions:
Valuation date	February 14, 2025		February 1, 2024		February 6, 2023
Fair value on valuation date (in millions)	$11.3		$9.5		$12.0
Weighted average fair value per share	$36.49		$35.66		$39.95
Expected share price volatility	38.0	%	34.0	%	35.0	%
Risk-free interest rate	4.35	%	3.98	%	4.12	%

_____________________

(1)Estimated RSUs earned for the 2025 and 2024 Performance-Based RSUs are based on the actual achievement of the applicable FFO Performance Condition and estimated achievement of the Net Debt to EBITDA Ratio Performance Condition and the TSR Condition. The 2023 Performance-Based RSUs earned are based on actual achievement of the FFO Performance Condition, the Net Debt to EBITDA Ratio Performance Condition, and the TSR Condition upon completion of the performance measurement period at December 31, 2025.

Market measure-based Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Restricted Stock Units Award Activity

A summary of our Performance-Based RSUs activity from January 1, 2025 through December 31, 2025 is presented below:


	Nonvested RSUs			Vested RSUs	Total RSUs
	Amount	Weighted-Average Grant-Date Fair Value Per Share
Outstanding at January 1, 2025 (1)	926,695	$	42.26	81,274	1,007,969
Granted	308,671	36.49		—	308,671
Performance award achievement adjustment (2)	294,387	36.51		—	294,387
Vested	(183,474)	62.93		183,474	—
Settled	—	—		(137,016)	(137,016)
Issuance of dividend equivalents (3)	91,948	35.87		7,352	99,300
Forfeited	(44,116)	37.24		—	(44,116)
Outstanding as of December 31, 2025 (4)	1,394,111	$	37.11	135,084	1,529,195

____________________

(1)Effective 2025, management updated the presentation of the opening balance to reflect the performance adjustment related to Net Debt to EBITDA Ratio Performance Condition and the TSR Condition.

(2)Represents performance adjustments above target based on the actual achievement for 2023 awards and estimated achievement for 2024 and 2025 awards.

(3)Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreements.

(4)Outstanding nonvested RSUs as of December 31, 2025 represent the actual achievement of the 2023 Performance-Based RSUs and the estimated achievement of 2024 and 2025 Performance-Based RSUs as of December 31, 2025. Dividend equivalents earned will vest along with the underlying award and are also subject to changes based on the number of RSUs ultimately earned for each underlying award.

A summary of our Performance-Based RSUs activity for the years ended December 31, 2025, 2024, and 2023 is presented below:


	RSUs Granted			RSUs Vested
Years ended December 31,	Non-Vested RSUs Granted	Weighted-Average Fair Value Per Share		Vested RSUs	Total Vest-Date Fair Value (in thousands)
2025	308,671	$	36.49	190,826	$	7,016
2024	265,205	$	35.66	1,089,879	$	38,364
2023	300,007	$	39.95	290,570	$	11,105

Time-Based Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Restricted Stock Units Award Activity

A summary of our Time-Based RSUs activity from January 1, 2025 through December 31, 2025 is presented below:


	Nonvested RSUs			Vested RSUs	Total RSUs
	Amount	Weighted Average Grant-Date Fair Value Per Share
Outstanding at January 1, 2025	537,426	$	36.37	242,685	780,111
Granted	258,356	34.66		—	258,356
Vested	(313,893)	40.85		313,893	—
Settled	—	—		(347,900)	(347,900)
Issuance of dividend equivalents (1)	27,154	35.87		18,668	45,822

Forfeited	(25,401)	35.81		—	(25,401)

Outstanding as of December 31, 2025	483,642	$	35.37	227,346	710,988

____________________

(1)Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreements.

A summary of our Time-Based RSUs activity for the years ended December 31, 2025, 2024, and 2023 is presented below:


	RSUs Granted			RSUs Vested
Year ended December 31,	Non-Vested RSUs Issued	Weighted-Average Grant Date Fair Value Per Share		Vested RSUs	Total Vest-Date Fair Value (1) (in thousands)
2025	258,356	$	34.66	332,561	$	12,236
2024	385,718	$	36.12	281,168	$	10,878
2023	247,017	$	38.12	343,334	$	12,425

____________________

(1) Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company’s common stock on the NYSE on the day of vesting. Excludes the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Rental Income and Future Minimum Rent (Tables)

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Schedule of Rental Income

The table below sets forth the allocation of rental income between fixed and variable lease payments and net collectability considerations:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Fixed lease payments	$	900,285	$	923,029	$	944,618
Variable lease payments	194,374		197,502		184,672
Impact from tenant creditworthiness considerations (1)	(1,072)		(2,416)		(11,553)
Total rental income	$	1,093,587	$	1,118,115	$	1,117,737

____________________

(1)Represents reversal/reserve adjustments to rental income related to our assessment of the collectability of amounts due under leases with our tenants, including recognition of deferred rent balances associated with tenants moved to / restored from a cash basis of revenue recognition and allowances for uncollectible receivables.

Schedule of Future Contractual Minimum Rent Under Operating Lease

Future contractual minimum rent under operating leases, which includes amounts contractually due from leases that are on a cash basis of reporting due to creditworthiness considerations, as of December 31, 2025 for future periods is summarized as follows:


Year Ending	(in thousands)
2026	$	769,406
2027	769,403
2028	742,321
2029	666,034
2030	583,844
Thereafter	1,591,508
Total (1)	$	5,122,516

____________________

(1)Excludes residential leases, leases at properties classified as held for sale, and leases with an initial term of one year or less.

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Schedule of Contractual Expiration Dates for Ground Leases

The following table summarizes our properties that are held subject to long-term non-cancellable ground lease obligations as of December 31, 2025 and the respective contractual expiration dates:


Property (1)			Contractual Expiration Date
701, 801, and 837 N. 34th Street, Seattle, WA (2)			December 2041
1701 Page Mill Road and 3150 Porter Drive, Palo Alto, CA			December 2067
Kilroy Airport Center Phases I, II, and III, Long Beach, CA (3)			July 2084
3243 S. La Cienega Boulevard, Los Angeles, CA			October 2106
200 W. 6th Street, Austin, TX			December 2112

____________________

(1) Excludes one month-to-month ground lease.

(2) The Company has three 10-year and one 45-year extension options for this ground lease, which if exercised would extend the expiration date to December 2116. These extension options are not assumed to be exercised in our calculation of the present value of the future minimum lease payments for this lease. The Company also has a purchase option for this ground lease.

(3) Assumes the impact of all extension options held by the Company.

Schedule of Minimum Commitment Under Ground Leases

The minimum commitment under our ground leases as of December 31, 2025 for future periods is as follows:


Year Ending	(in thousands)
2026	$	6,809
2027	6,850
2028	6,869
2029	6,869
2030	6,869
Thereafter	360,875
Total undiscounted cash flows (1) (2) (3) (4) (5) (6)	$	395,141
Present value discount	(267,513)
Ground lease liabilities	$	127,628

________________________

(1)Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum obligations under the ground leases including any extension options (but excluding the Seattle ground lease extension options).

(2) Our 701, 801, and 837 N. 34th Street ground lease obligation is subject to a fair market value adjustment every five years based on CPI adjustments and every 15 years based on third-party appraisals. The contractual obligations for that ground lease included above assume the current annual ground lease obligation in effect at December 31, 2025 for the remainder of the lease term, as we cannot predict future adjustments.

(3) Our 1701 Page Mill Road and 3150 Porter Drive ground lease obligation includes a component that is based on the percentage of adjusted gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every 10 years by an amount equal to 60% of the average annual percentage rent for the previous three years. The contractual obligations for this lease included above assume the current annual ground lease obligation in effect at December 31, 2025 for the remainder of the lease term, as we cannot predict future adjustments.

(4) Our Kilroy Airport Center Phases I, II, and III ground lease obligation is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals with predetermined maximum annual increases. The contractual obligations for that ground lease included above assume the contractual minimum annual rent prior to the consideration of any variable rental payments in effect at December 31, 2025 for the remainder of the lease term, as we cannot predict future adjustments.

(5) Our 3243 S. La Cienega Boulevard ground lease obligation is subject to fixed 5% ground rent increases every five years, with the next increase occurring on November 1, 2027.

(6) Our 200 W. 6th Street ground lease obligation is subject to fixed 2% annual ground rent increases, with resets occurring every ten years based on CPI. The contractual obligations for that ground lease included above assume increases for the remaining current ten-year period based on the contractual minimum annual rent prior to the consideration of any variable rental payments (1.5% of gross income) in effect at December 31, 2025.

Schedule of Environmental Loss Contingencies by Site

We had the following accrued environmental remediation liabilities in connection with certain of our in-process and future development projects:


	December 31, 2025		December 31, 2024
	(in thousands)
Environmental liabilities	$	70,030	$	72,003

Fair Value Measurements and Disclosures (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of Fair Value of the Company's Deferred Compensation Plan Assets

The following table sets forth the fair value of our Deferred Compensation Plan:


	Fair Value (Level 1) (1)
	December 31, 2025		December 31, 2024
Description	(in thousands)
Deferred Compensation Plan assets (2)	$	30,807	$	27,965

____________________

(1)Based on quoted prices in active markets for identical securities.

(2)The Deferred Compensation Plan assets are held in a limited rabbi trust.

Schedule of Carrying Value and Fair Value of Other Financial Instruments

The following table sets forth the carrying value and the fair value of our other financial instruments:


	December 31, 2025				December 31, 2024
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)


Liabilities
Secured debt, net	$	592,685	$	587,244	$	598,199	$	569,061
Unsecured debt, net	$	3,996,774	$	3,834,485	$	3,999,566	$	3,681,914

Fair value is calculated using Level 2 inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

Net Income Available to Common Stockholders Per Share of the Company (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Schedule of Net income Available to Common Stockholders

The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders:


	Year Ended December 31,
	2025		2024		2023
	(in thousands, except share and per share amounts)
Numerator:
Net income available to common stockholders	$	276,121	$	210,969	$	212,241

Allocation to participating securities (1)	(925)		(1,967)		(1,233)
Numerator for basic and diluted net income available to common stockholders	$	275,196	$	209,002	$	211,008
Denominator:
Basic weighted average vested shares outstanding	118,278,990		117,649,111		117,160,173
Effect of dilutive securities	553,045		507,876		346,082
Diluted weighted average vested shares and common stock equivalents outstanding	118,832,035		118,156,987		117,506,255
Basic earnings per share:
Net income available to common stockholders per share	$	2.33	$	1.78	$	1.80
Diluted earnings per share:
Net income available to common stockholders per share	$	2.32	$	1.77	$	1.80

_____________________

(1)Participating securities include certain time-based RSUs and vested market measure-based RSUs.

Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2025

Net Income Available To Common Unitholders [Line Items]

Schedule of Net income Available to Common Unitholders

The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders:


	Year Ended December 31,
	2025		2024		2023
	(in thousands, except share and per share amounts)
Numerator:
Net income available to common stockholders	$	276,121	$	210,969	$	212,241

Allocation to participating securities (1)	(925)		(1,967)		(1,233)
Numerator for basic and diluted net income available to common stockholders	$	275,196	$	209,002	$	211,008
Denominator:
Basic weighted average vested shares outstanding	118,278,990		117,649,111		117,160,173
Effect of dilutive securities	553,045		507,876		346,082
Diluted weighted average vested shares and common stock equivalents outstanding	118,832,035		118,156,987		117,506,255
Basic earnings per share:
Net income available to common stockholders per share	$	2.33	$	1.78	$	1.80
Diluted earnings per share:
Net income available to common stockholders per share	$	2.32	$	1.77	$	1.80

_____________________

(1)Participating securities include certain time-based RSUs and vested market measure-based RSUs.

Kilroy Realty L.P.

Net Income Available To Common Unitholders [Line Items]

Schedule of Net income Available to Common Unitholders

The following table reconciles the numerator and denominator in computing the Operating Partnership’s basic and diluted per-unit computations for net income available to common unitholders:


	Year Ended December 31,
	2025		2024		2023
	(in thousands, except unit and per unit amounts)
Numerator:
Net income available to common unitholders	$	278,803	$	213,031	$	214,324

Allocation to participating securities (1)	(925)		(1,967)		(1,233)
Numerator for basic and diluted net income available to common unitholders	$	277,878	$	211,064	$	213,091
Denominator:
Basic weighted average vested units outstanding	119,428,865		118,799,685		118,310,747
Effect of dilutive securities	553,045		507,876		346,082
Diluted weighted average vested units and common unit equivalents outstanding	119,981,910		119,307,561		118,656,829
Basic earnings per unit:
Net income available to common unitholders per unit	$	2.33	$	1.78	$	1.80
Diluted earnings per unit:
Net income available to common unitholders per unit	$	2.32	$	1.77	$	1.80

____________________

(1)Participating securities include certain time-based RSUs and vested market measure-based RSUs.

Supplemental Cash Flows Information of the Company and the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2025

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Cash Flows

Supplemental cash flows information of the Company is as follows:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $79,542, $77,871, and $74,052 as of December 31, 2025, 2024, and 2023, respectively	$	115,912	$	126,668	$	105,767
Cash paid for amounts included in the measurement of ground lease liabilities	$	7,578	$	6,484	$	6,733
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	$	62,570	$	54,190	$	95,575
Tenant improvements funded directly by tenants	$	3,026	$	2,745	$	7,364



Remeasurement of ground lease liability and related right of use ground lease asset	$	—	$	4,782	$	—



NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 12)	$	65,009	$	64,850	$	64,440

Supplemental cash flows information of the Operating Partnership is as follows:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $79,542, $77,871, and $74,052 as of December 31, 2025, 2024, and 2023, respectively	$	115,912	$	126,668	$	105,767
Cash paid for amounts included in the measurement of ground lease liabilities	$	7,578	$	6,484	$	6,733
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	$	62,570	$	54,190	$	95,575
Tenant improvements funded directly by tenants	$	3,026	$	2,745	$	7,364




Remeasurement of ground lease liability and related right of use ground lease asset	$	—	$	4,782	$	—

NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 13)	$	65,009	$	64,850	$	64,440

Tax Treatment of Distributions (Tables)

12 Months Ended

Dec. 31, 2025

Class of Stock [Line Items]

Schedule of Reconciliation of Dividends Declared to Dividends Paid

The following table reconciles the dividends declared per share of common stock to the dividends paid per share of common stock as follows:


	Year Ended December 31,
Dividends	2025		2024		2023
Dividends declared per share of common stock	$	2.16	$	2.16	$	2.16
Less: Dividends declared in the current year and paid in the following year	(0.54)		(0.54)		(0.54)
Add: Dividends declared in the prior year and paid in the current year	0.54		0.54		0.54
Dividends paid per share of common stock	$	2.16	$	2.16	$	2.16

Common Stock

Class of Stock [Line Items]

Schedule of Reconciliation of Dividends Declared to Dividends Paid

The unaudited income tax treatment for the dividends to common stockholders reportable as identified in the table above was as follows:


	Year Ended December 31,
Shares of Common Stock	2025				2024				2023
Ordinary dividend (1) (2)	$	1.43	66.34	%	$	1.92	88.75	%	$	2.09	96.67	%

Return of capital	0.25		11.62	%	0.24		11.02	%	0.07		3.21	%
Capital gains	0.04		1.76	%	0.01		0.23	%	—		0.12	%
Unrecaptured section 1250 gains	0.44		20.28	%	—		—	%	—		—	%
	$	2.16	100.00	%	$	2.16	100.00	%	$	2.16	100.00	%

____________________

(1)Total qualified dividend, which is a subset of, and is included in, the Ordinary dividend amount.

(2)The Tax Cuts and Jobs Act enacted on December 22, 2017 generally allows a deduction for noncorporate taxpayers equal to 20% of ordinary dividends distributed by a REIT (excluding capital gain dividends and qualified dividend income). The amount of dividend eligible for this deduction is referred to as the Section 199A Dividend. For the year ended December 31, 2025, the Section 199A Dividend is equal to the total ordinary income dividend.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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+ Details

Segments (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following table presents Net Income:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
REVENUES:
Rental income	$	1,093,587	$	1,118,115	$	1,117,737
Other property income	19,080		17,514		11,957
Total revenues	1,112,667		1,135,629		1,129,694
EXPENSES:
Property expenses	243,726		243,441		228,964
Real estate taxes	107,564		108,951		105,868
Ground leases	12,048		11,715		9,732
General and administrative expenses	73,108		71,074		94,264
Leasing costs	10,352		8,764		6,506
Depreciation and amortization	354,854		356,182		355,278
Total expenses	801,652		800,127		800,612
OTHER INCOME (EXPENSES):
Interest income	6,970		37,752		22,592
Interest expense	(126,292)		(145,287)		(114,216)
Other income (expense)	168		(992)		830
Gains on sales of depreciable operating properties	127,038		—		—
Impairment of real estate assets	(16,259)		—		—


Gain on sale of long-lived assets	—		5,979		—
Total other expenses	(8,375)		(102,548)		(90,794)
NET INCOME	$	302,640	$	232,954	$	238,288

Organization and Ownership - Operating Properties (Details)	12 Months Ended
	Dec. 31, 2025 ft² building property tenant development_project propertyHeldForSale
Real Estate Properties [Line Items]
Rentable Square Feet (unaudited)	16,292,164
Disposal group, disposed of by sale \| San Diego
Real Estate Properties [Line Items]
Number of Properties \| propertyHeldForSale	1
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of Buildings \| building	121
Rentable Square Feet (unaudited)	16,292,164
Number of Tenants \| tenant	438
Percentage Occupied (unaudited)	81.60%
Stabilized Residential Properties
Real Estate Properties [Line Items]
Number of Properties \| property	3
Number of Units \| property	1,001
2025 Average Occupancy (unaudited)	94.10%
In-process development project - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet (unaudited)	871,738
Number of Properties \| development_project	1

Organization and Ownership - Narrative (Details)	12 Months Ended
Organization and Ownership - Narrative (Details)	Dec. 31, 2025 property development_site	Dec. 31, 2024
Operating Partnership
Real Estate Properties [Line Items]
Ownership interest (percent)	99.10%	99.00%
Operating Partnership \| Non-Affiliated Investors and Certain Executive Officer and Directors
Real Estate Properties [Line Items]
Ownership interest (percent)	0.90%	1.00%
Future Development Site
Real Estate Properties [Line Items]
Number of future development sites \| development_site	8
Stabilized Office Properties \| Washington
Real Estate Properties [Line Items]
Number of buildings \| property	10
Stabilized Office Properties \| Texas
Real Estate Properties [Line Items]
Number of buildings \| property	1
Future development project \| Washington
Real Estate Properties [Line Items]
Number of buildings \| development_site	1
Future development project \| Texas
Real Estate Properties [Line Items]
Number of buildings \| development_site	1
Office Properties Owned by Consolidated Property Partnerships
Real Estate Properties [Line Items]
Number of buildings \| property	4

Organization and Ownership - Consolidated Property Partnership Ownership Percentage (Details)	Dec. 31, 2025 property
Consolidated property partnerships
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of property partnerships	3
100 First Street Member, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	56.00%
303 Second Street Member, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	56.00%
Redwood City Partners, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	93.00%

Basis of Presentation and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) property development_site investment	Dec. 31, 2025 USD ($) property development_site investment	Dec. 31, 2025 USD ($) property development_site investment	Dec. 31, 2025 USD ($) property reportableSegment development_site investment	Dec. 31, 2025 USD ($) property operatingSegment development_site investment	Dec. 31, 2024 USD ($) property investment	Dec. 31, 2023 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of equity method investments \| investment	0	0	0	0	0	0
Lease-up properties occupancy percentage		95.00%
Lease-up properties occupancy duration	1 year
Conversion ratio		1
Unrecognized tax benefits \| $	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Number of operating segments				1	1
Minimum \| Lease Agreements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Finite-lived intangible asset, useful life	1 year	1 year	1 year	1 year	1 year
Maximum \| Lease Agreements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Finite-lived intangible asset, useful life	20 years	20 years	20 years	20 years	20 years
Disposal group, disposed of by sale
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Restricted cash \| $	$ 0	$ 0	$ 0	$ 0	$ 0	0
Building and building improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Depreciation of real estate \| $			$ 305,800,000			$ 308,000,000.0	$ 300,100,000
Consolidated property partnerships
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of property partnerships	3	3	3	3	3
Stabilized Office Properties \| Washington
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings	10	10	10	10	10
Stabilized Office Properties \| Texas
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings	1	1	1	1	1
Future development project \| Washington
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings \| development_site	1	1	1	1	1
Future development project \| Texas
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings \| development_site	1	1	1	1	1
Variable Interest Entity, Primary Beneficiary
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of VIEs	2	2	2	2	2	3

Basis of Presentation and Significant Accounting Policies - Schedule of Total Assets, Liabilities, and Noncontrolling Interest (Details) $ in Thousands	Dec. 31, 2025 USD ($) property	Dec. 31, 2024 USD ($) property
Variable Interest Entity [Line Items]
Total assets	$ 10,915,076	$ 10,898,357
Total liabilities	$ 5,277,333	$ 5,289,488
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of VIEs \| property	2	3
Total assets	$ 380,940	$ 435,478
Total liabilities	18,304	18,047
Variable Interest Entity, Primary Beneficiary \| Real estate investment
Variable Interest Entity [Line Items]
Total assets	319,400	357,300
Variable Interest Entity, Primary Beneficiary \| 100 First LLC and 303 Second LLC
Variable Interest Entity [Line Items]
Noncontrolling Interest in Variable Interest Entity	$ 160,299	$ 169,445

- Definition

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Basis of Presentation and Significant Accounting Policies - Schedule of Buildings, Improvements, and Tenant Improvements Depreciation (Details)	Dec. 31, 2025
Minimum \| Building and building improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	25 years
Minimum \| Tenant Improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	1 year
Minimum \| Leasehold improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	1 year
Maximum \| Building and building improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	40 years
Maximum \| Tenant Improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	20 years
Maximum \| Leasehold improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	5 years

Acquisitions - Operating Property Acquisitions (Details) $ in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2025 USD ($) ft² property	Sep. 30, 2025 USD ($) ft² property	Sep. 30, 2024 USD ($) ft² property	Dec. 31, 2025 USD ($) ft² property	Dec. 31, 2024 USD ($) ft² property
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Rentable square feet (unaudited)	16,292,164			16,292,164
2025 Acquisitions
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings \| property				5
Rentable square feet (unaudited)	538,532			538,532
Purchase price \| $				$ 397.3
3530 & 3550 John Hopkins Court and 3535 & 3565 General Atomics Court (Nautilus)
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings \| property	4
Rentable square feet (unaudited)	232,166			232,166
Purchase price \| $	$ 192.0
335-345 N. Maple Drive (Maple Plaza)
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings \| property		1
Rentable square feet (unaudited)		306,366
Purchase price \| $		$ 205.3
2024 Acquisitions
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings \| property					2
Rentable square feet (unaudited)					103,731
Purchase price \| $					$ 35.0
12707 & 12777 High Bluff Drive (Junction at Del Mar)
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings \| property			2
Rentable square feet (unaudited)			103,731
Purchase price \| $			$ 35.0

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Assets
Land	$ 50,382	$ 6,000
Buildings and improvements	287,563	15,703
Deferred leasing costs and acquisition-related intangible assets	61,454	13,534
Prepaid expenses and other assets, net	0	30
Total assets acquired	399,399	35,267
Liabilities
Acquisition-related intangible liabilities	2,981	267
Total liabilities assumed	2,981	267
Net assets and liabilities acquired	396,418	35,000
Deferred leasing costs and acquisition-related intangible assets	61,454	13,534
Below-market leases acquired	$ 3,000	$ 300
Weighted average amortization of below market leases (in years)	3 years 3 months 18 days	4 years 10 months 24 days
In-Place Leases
Assets
Deferred leasing costs and acquisition-related intangible assets	$ 46,600	$ 10,500
Liabilities
Deferred leasing costs and acquisition-related intangible assets	$ 46,600	$ 10,500
Weighted average amortization period (in years)	4 years 4 months 24 days	4 years 8 months 12 days
Above Market Leases
Assets
Deferred leasing costs and acquisition-related intangible assets	$ 7,000	$ 1,000
Liabilities
Deferred leasing costs and acquisition-related intangible assets	$ 7,000	$ 1,000
Weighted average amortization period (in years)	4 years 8 months 12 days	4 years 7 months 6 days
Leasing Commissions
Assets
Deferred leasing costs and acquisition-related intangible assets	$ 7,900	$ 2,000
Liabilities
Deferred leasing costs and acquisition-related intangible assets	$ 7,900	$ 2,000
Weighted average amortization period (in years)	4 years 8 months 12 days	4 years 10 months 24 days

Acquisitions - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Acquisitions - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Acquisition costs, capitalized	$ 0.8	$ 0.2
Net of credits, and excluding acquisition-related costs	$ 0.8

Dispositions and Real Estate Held For Sale - Operating Property Dispositions (Details) $ in Thousands	1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2025 USD ($) ft² building	Sep. 30, 2025 USD ($) ft² building	Jun. 30, 2025 USD ($) ft² building	Dec. 31, 2025 USD ($) ft² building	Dec. 31, 2025 USD ($) ft² building	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet \| ft²	16,292,164			16,292,164	16,292,164
Gains on sales of depreciable operating properties					$ 127,038	$ 0	$ 0
Asset impairment charges				$ (16,300)
Disposal group, disposed of by sale \| Total 2025 Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| building	6			6	6
Rentable square feet \| ft²	1,067,741			1,067,741	1,067,741
Sales price					$ 466,000
Disposal group, disposed of by sale \| 501 Santa Monica Boulevard
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| building			1
Rentable square feet \| ft²			78,509
Sales price			$ 40,000
Disposal group, disposed of by sale \| Silicon Valley Campus
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| building		4
Rentable square feet \| ft²		663,460
Sales price		$ 365,000
Disposal group, disposed of by sale \| 6255 W. Sunset Boulevard, Los Angeles, CA (Sunset Media Center)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| building	1			1	1
Rentable square feet \| ft²	325,772			325,772	325,772
Sales price	$ 61,000

Dispositions and Real Estate Held For Sale - Narrative (Details) $ in Millions	Jan. 23, 2026 USD ($)	Dec. 31, 2025 ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet (unaudited) \| ft²		16,292,164
Disposal group, disposed of by sale \| San Diego \| Subsequent event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Dispositions sales price \| $	$ 124.5
Estimated gain on sale \| $	$ 8.2
Disposal group, held-for-sale \| San Diego
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet (unaudited) \| ft²		427,764

Dispositions and Real Estate Held for Sale - Schedule of Long-Lived Asset Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Real estate and other assets held for sale, net
Deferred leasing costs and acquisition-related intangible assets, net	$ 278,232	$ 225,937
Liabilities related to real estate assets held for sale
Deferred revenue and acquisition-related intangible liabilities, net	125,628	142,437
Rents received in advance and tenant security deposits	75,701	$ 71,003
Disposal group, held-for-sale \| San Diego
Real estate and other assets held for sale, net
Land	23,158
Buildings and improvements	198,535
Total real estate assets held for sale	221,693
Accumulated depreciation and amortization	(116,693)
Total real estate assets held for sale, net	105,000
Current receivables, net	598
Deferred rent receivables, net	5,433
Deferred leasing costs and acquisition-related intangible assets, net	3,939
Prepaid expenses and other assets, net	185
Total real estate and other assets held for sale, net	115,155
Liabilities related to real estate assets held for sale
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	663
Deferred revenue and acquisition-related intangible liabilities, net	1,882
Rents received in advance and tenant security deposits	2,400
Disposal Group, Including Discontinued Operation, Liabilities	$ 4,945

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net - Deferred Leasing Costs and Acquisition-related Intangible Assets and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Total deferred leasing costs and acquisition-related intangible assets, net	$ 278,232	$ 225,937
Acquisition-related Intangible Liabilities, net:
Below-market operating leases	41,292	38,413
Accumulated amortization	(14,613)	(10,995)
Acquisition-related intangible liabilities, net	26,679	27,418
Total acquisition-related intangible liabilities, net	26,679	27,418
Deferred Leasing Costs
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Finite-lived intangible assets, gross	310,936	303,541
Accumulated amortization	(131,985)	(136,171)
Finite-lived intangible assets, net	178,951	167,370
Above-market operating leases
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Finite-lived intangible assets, gross	8,239	1,269
Accumulated amortization	(779)	(156)
Finite-lived intangible assets, net	7,460	1,113
In-Place Leases
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Finite-lived intangible assets, gross	123,329	78,979
Accumulated amortization	(31,508)	(21,525)
Finite-lived intangible assets, net	$ 91,821	$ 57,454

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net - Amortization of Deferred Leasing Costs and Acquisition-related Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	$ 40,713	$ 38,067	$ 41,001
Estimated annual amortization related to acquisition-related intangible liabilities
Below-market operating leases, 2026	(4,530)
Below-market operating leases, 2027	(4,075)
Below-market operating leases, 2028	(3,739)
Below-market operating leases, 2029	(2,976)
Below-market operating leases, 2030	(2,593)
Below-market operating leases, thereafter	(8,766)
Below-market operating leases	(26,679)	(27,418)
Deferred Leasing Costs
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	31,670	34,135	31,771
Estimated annual amortization related to acquisition-related intangible assets
Finite-lived intangible assets, 2026	32,410
Finite-lived intangible assets, 2027	28,802
Finite-lived intangible assets, 2028	26,406
Finite-lived intangible assets, 2029	22,950
Finite-lived intangible assets, 2030	19,717
Finite-lived intangible assets, thereafter	48,666
Finite-lived intangible assets, net	178,951	167,370
Above-market operating leases
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	645	86	31
Estimated annual amortization related to acquisition-related intangible assets
Finite-lived intangible assets, 2026	1,809
Finite-lived intangible assets, 2027	1,620
Finite-lived intangible assets, 2028	1,520
Finite-lived intangible assets, 2029	1,371
Finite-lived intangible assets, 2030	893
Finite-lived intangible assets, thereafter	247
Finite-lived intangible assets, net	7,460	1,113
In-Place Leases
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	12,122	7,453	15,878
Estimated annual amortization related to acquisition-related intangible assets
Finite-lived intangible assets, 2026	21,138
Finite-lived intangible assets, 2027	16,914
Finite-lived intangible assets, 2028	14,792
Finite-lived intangible assets, 2029	12,083
Finite-lived intangible assets, 2030	8,487
Finite-lived intangible assets, thereafter	18,407
Finite-lived intangible assets, net	91,821	57,454
Below-market operating leases
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization of intangible liabilities	$ (3,724)	$ (3,607)	$ (6,679)

Prepaid Expenses and Other Assets, net - Schedule of Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Furniture, fixtures, and other long-lived assets, net	$ 29,179	$ 26,316
Prepaid expenses, net	11,000	8,470
Deferred financing costs, net	9,150	12,692
Other assets	5,232	4,457
Total prepaid expenses and other assets, net	54,561	51,935
Depreciation and amortization of intangible assets	$ 43,400	$ 40,200

Secured and Unsecured Debt of the Company (Details) $ in Thousands	Dec. 31, 2025 USD ($) debt_covenant	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Total secured debt	$ 592,685	$ 598,199
Number of debt covenants impacting payment of dividends during event of default \| debt_covenant	1
Unsecured debt
Debt Instrument [Line Items]
Long-term debt	$ 4,000,000	$ 4,000,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes - Registered Offerings and Private Placement (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total secured debt	$ 592,685	$ 598,199
Unamortized deferred financing costs	(9,150)	(12,692)
Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross	4,625,442
Total secured debt	592,685	598,199
Long-term debt	4,589,459
Secured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Total secured debt	600,442	606,688
Unamortized deferred financing costs	(7,757)	(8,489)
Long-term debt	592,685	598,199
3.57% Mortgage Payable due December 2026 \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross	$ 148,800
3.57% Mortgage Payable due December 2026 \| Secured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	3.57%
GAAP effective rate	3.80%
Long-term debt, gross	$ 148,815	152,668
4.48% Mortgage Payable due July 2027 \| Secured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.48%
GAAP effective rate	4.57%
Long-term debt, gross	$ 76,627	79,020
5.90% Mortgage Payable due August 2034 \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross	$ 375,000
5.90% Mortgage Payable due August 2034 \| Secured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	5.90%
GAAP effective rate	6.13%
Long-term debt, gross	$ 375,000	$ 375,000

Secured and Unsecured Debt of the Operating Partnership - Secured Debt and Additional Information (Details)	1 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025	Dec. 31, 2025 USD ($) debt_covenant	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Jan. 31, 2024 USD ($)
Debt Instrument [Line Items]
Repayments of unsecured debt				$ 400,000,000	$ 723,712,000	$ 0
Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross				4,625,442,000
Less: Unamortized Net Discounts and Deferred Financing costs				35,983,000
Repayments of unsecured debt				$ 400,000,000	723,712,000	$ 0
Number of noncompliant debt covenants that could require immediate repayment of full principal balance of associated debt \| debt_covenant				1
Secured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Net book value of properties pledged as collateral for secured debt				$ 950,400,000
Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross				3,825,000,000	3,825,000,000
Less: Unamortized Net Discounts and Deferred Financing costs				27,949,000	24,205,000
Unsecured debt \| Kilroy Realty L.P. \| 6.250% Unsecured Senior Notes
Debt Instrument [Line Items]
Principal amount of debt									$ 400,000,000
Long-term debt, gross				$ 400,000,000	400,000,000				400,000,000.0
Unamortized discount (premium), net									$ 4,500,000
Stated Coupon Rate				6.25%					6.25%
Unsecured debt \| Kilroy Realty L.P. \| 3.450% Unsecured Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount of debt					425,000,000
Long-term debt, gross					$ 403,700,000
Stated Coupon Rate					3.45%
Unsecured debt \| Kilroy Realty L.P. \| 3.450% Unsecured Senior Notes Due December 15, 2024
Debt Instrument [Line Items]
Principal amount of debt					$ 425,000,000
Unsecured debt \| Kilroy Realty L.P. \| 5.875% Unsecured Senior Notes Due 2035
Debt Instrument [Line Items]
Long-term debt, gross				$ 400,000,000	0		$ 400,000,000
Stated Coupon Rate				5.875%			5.875%
Less: Unamortized Net Discounts and Deferred Financing costs							$ 4,000,000
Unsecured debt \| Kilroy Realty L.P. \| 4.375% Unsecured Senior Notes Due 2036
Debt Instrument [Line Items]
Stated Coupon Rate	4.375%		4.375%
Extinguishment of debt, amount	$ 400,000,000
Revolving credit facility \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 1,100,000,000	$ 1,100,000,000
Revolving credit facility \| Kilroy Realty L.P. \| $400.0 million term loan facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 1,100,000,000
Term Loan Facility \| Kilroy Realty L.P. \| $400.0 million term loan facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 520,000,000
Repayments of unsecured debt		$ 120,000,000		200,000,000
Term Loan Facility \| Kilroy Realty L.P. \| Unsecured New Term Loan Facility
Debt Instrument [Line Items]
Principal amount of debt				$ 200,000,000
Maturity period			12 months	12 months

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Aug. 31, 2025	Dec. 31, 2024	Jan. 31, 2024
Debt Instrument [Line Items]
Total Unsecured Senior Notes, Net	$ 3,996,774		$ 3,999,566
Unamortized deferred financing costs	(9,150)		(12,692)
Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross	4,625,442
Less: Unamortized Net Discounts and Deferred Financing costs	(35,983)
Total Unsecured Senior Notes, Net	3,996,774		3,999,566
Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross	3,825,000		3,825,000
Less: Unamortized Net Discounts and Deferred Financing costs	(27,949)		(24,205)
Total Unsecured Senior Notes, Net	$ 3,797,051		3,800,795
4.300% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.30%
Effective Interest Rate	4.389%
Long-term debt, gross	$ 50,000		50,000
4.350% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.35%
Effective Interest Rate	4.437%
Long-term debt, gross	$ 200,000		200,000
3.350% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	3.35%
Effective Interest Rate	3.416%
Long-term debt, gross	$ 175,000		175,000
3.450% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	3.45%
Effective Interest Rate	3.507%
Long-term debt, gross	$ 75,000		75,000
4.270% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.27%
Effective Interest Rate	4.322%
Long-term debt, gross	$ 350,000		350,000
4.375% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.375%
Effective Interest Rate	4.444%
Long-term debt, gross	$ 0		400,000
4.750% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.75%
Effective Interest Rate	4.874%
Long-term debt, gross	$ 400,000		400,000
4.250% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	4.25%
Effective Interest Rate	4.383%
Long-term debt, gross	$ 400,000		400,000
3.050% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	3.05%
Effective Interest Rate	3.168%
Long-term debt, gross	$ 500,000		500,000
2.500% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	2.50%
Effective Interest Rate	2.626%
Long-term debt, gross	$ 425,000		425,000
2.650% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	2.65%
Effective Interest Rate	2.727%
Long-term debt, gross	$ 450,000		450,000
5.875% Unsecured Senior Notes Due 2035 \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	5.875%	5.875%
Effective Interest Rate	6.076%
Long-term debt, gross	$ 400,000	$ 400,000	0
Less: Unamortized Net Discounts and Deferred Financing costs		$ (4,000)
6.250% Unsecured Senior Notes \| Unsecured debt \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Stated Coupon Rate	6.25%			6.25%
Effective Interest Rate	6.412%
Long-term debt, gross	$ 400,000		400,000	$ 400,000
Unamortized discount (premium), net				$ (4,500)
Unsecured Senior Notes \| Unsecured debt
Debt Instrument [Line Items]
Unamortized discount (premium), net	(11,000)		(8,400)
Unamortized deferred financing costs	$ (16,900)		$ (15,800)

Secured and Unsecured Debt of the Operating Partnership - Unsecured Revolving Credit Facility and Term Loan Facility (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) extension_option	Dec. 31, 2024 USD ($) extension_option
Debt Instrument [Line Items]
Deferred financing costs, net	$ 9,150,000	$ 12,692,000
Number of extension options \| extension_option		2
Revolving credit facility \| Kilroy Realty L.P.
Debt Instrument [Line Items]
Outstanding borrowings	0	$ 0
Remaining borrowing capacity	1,100,000,000	1,100,000,000
Total borrowing capacity	$ 1,100,000,000	$ 1,100,000,000
Interest rate	5.07%	5.69%
Annual facility fee (percent)	0.25%	0.25%
Deferred financing costs, net	$ 9,150,000	$ 12,692,000
Contingent additional borrowings	$ 500,000,000.0	$ 500,000,000.0
Extension period (in months)	6 months	6 months
Revolving credit facility \| Kilroy Realty L.P. \| Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding letters of credit	$ 5,200,000	$ 5,200,000
Debt instrument, reduction interest rate	0.01%	0.01%
Revolving credit facility \| Kilroy Realty L.P. \| Unsecured Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on SOFR and LIBOR	1.10%	1.10%
Revolving Credit Facility and Term Loan Facility \| Kilroy Realty L.P. \| Unsecured Revolving Credit Facility \| Adjusted SOFR
Debt Instrument [Line Items]
Basis spread on SOFR and LIBOR	0.10%	0.10%
Unsecured debt \| Kilroy Realty L.P. \| 2024 Term Loan Facility
Debt Instrument [Line Items]
Number of extension options \| extension_option	2
Extension period (in months)	12 months
Line of credit \| Kilroy Realty L.P. \| 2024 Term Loan Facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 200,000,000	$ 200,000,000
Interest rate	5.02%	5.70%
Deferred financing costs, net	$ 277,000	$ 1,229,000
Contingent additional borrowings	$ 130,000,000.0
Term Loan Facility \| Kilroy Realty L.P. \| 2024 Term Loan Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on SOFR and LIBOR	1.20%	1.20%

Secured and Unsecured Debt of the Operating Partnership - Debt Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Stated debt maturities and scheduled amortization payments, excluding debt discounts
2026	$ 601,317
2027	249,125
Thereafter	2,400,000
Deferred financing costs, net	9,150	$ 12,692
Kilroy Realty L.P.
Stated debt maturities and scheduled amortization payments, excluding debt discounts
2028	400,000
2029	475,000
2030	500,000
Total aggregate principal value	4,625,442
Less: Unamortized Net Discounts and Deferred Financing costs	(35,983)
Total secured debt, net	4,589,459
Kilroy Realty L.P. \| Unsecured Term Loan Facility
Stated debt maturities and scheduled amortization payments, excluding debt discounts
Deferred financing costs, net	25,000
Kilroy Realty L.P. \| Unsecured Senior Notes
Stated debt maturities and scheduled amortization payments, excluding debt discounts
Unamortized discount	$ 11,000

Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 126,292	$ 145,287	$ 114,216
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	211,379	227,748	192,983
Capitalized interest	(85,087)	(82,461)	(78,767)
Interest expense	$ 126,292	$ 145,287	$ 114,216

Deferred Revenue and Acquisition-Related Intangible Liabilities, net - Deferred Revenue and Acquisition-Related Intangible Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Deferred revenue related to tenant-funded tenant improvements, net	$ 70,813	$ 81,738
Other deferred revenue, net	28,136	33,281
Acquisition-related intangible liabilities, net	26,679	27,418
Deferred revenue and acquisition-related intangible liabilities, net	$ 125,628	$ 142,437

Deferred Revenue and Acquisition-Related Intangible Liabilities, net - Estimated Amortization of Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Deferred Revenue, Future Amortization Recognized By Year [Abstract]
Total	$ 70,813	$ 81,738
Tenant funded tenant improvements
Disaggregation of Revenue [Line Items]
Deferred revenues amortized and recognized as rental income	14,600	$ 19,100	$ 20,700
Deferred Revenue, Future Amortization Recognized By Year [Abstract]
2026	12,933
2027	11,619
2028	10,457
2029	9,726
2030	9,037
Thereafter	17,041
Total	$ 70,813

Noncontrolling Interests on the Company’s Consolidated Financial Statements (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) trading_day $ / shares shares	Dec. 31, 2024 USD ($) trading_day $ / shares shares
Noncontrolling Interest [Line Items]
Conversion ratio	1
Common stock, par value ( in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Number of trading days \| trading_day	10	10
Redeemable noncontrolling interest, equity, common, fair value \| $	$ 43.2	$ 46.8
Non-Affiliated Investors and Certain Executive Officer and Directors \| Common Units
Noncontrolling Interest [Line Items]
Non-affiliated investors and other common units of the Operating Partnership (in shares)	1,133,562	1,150,574
Kilroy Realty L.P. \| Common Units
Noncontrolling Interest [Line Items]
Conversion ratio	1
Kilroy Realty L.P. \| Common Units
Noncontrolling Interest [Line Items]
Non-affiliated investors and other common units of the Operating Partnership (in shares)	1,133,562	1,150,574
Operating Partnership
Noncontrolling Interest [Line Items]
Ownership interest (percent)	99.10%	99.00%
Operating Partnership \| Non-Affiliated Investors and Certain Executive Officer and Directors
Noncontrolling Interest [Line Items]
Ownership interest (percent)	0.90%	1.00%

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Redwood LLC
Noncontrolling Interest [Line Items]
Consolidated property partnerships	$ 4,700	$ 4,900
Variable Interest Entity, Primary Beneficiary \| 100 First LLC and 303 Second LLC
Noncontrolling Interest [Line Items]
Consolidated property partnerships	$ 160,299	$ 169,445

Stockholders' Equity of the Company - Narrative (Details) - USD ($)	Dec. 31, 2025	Mar. 31, 2024	Feb. 29, 2024
2024 At-The-Market Program
Class of Stock [Line Items]
At the market stock offering aggregate gross sales price of common stock		$ 500,000,000.0
Share Repurchase Program
Class of Stock [Line Items]
Aggregate gross purchase price	$ 500,000,000		$ 500,000,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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+ Details

Stockholders' Equity of the Company - At-The-Market Offering and Derivatives and Distributions (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Dividends and Distributions payable to:
Accrued distributions	$ 65,009	$ 64,850
Outstanding Shares and Units:
Common stock (in shares)	118,372,451	118,046,674
Restricted Stock Units (RSUs)
Outstanding Shares and Units:
RSUs (in shares)	846,072	861,385
Kilroy Realty L.P.
Dividends and Distributions payable to:
Accrued distributions	$ 65,009	$ 64,850
Kilroy Realty L.P. \| Restricted Stock Units (RSUs)
Dividends and Distributions payable to:
Accrued distributions	$ 476	$ 484
Kilroy Realty L.P. \| Market measure-based Restricted Stock Units (RSUs)
Outstanding Shares and Units:
Number of RSUs outstanding (in shares)	1,394,111	926,695
Kilroy Realty L.P. \| Common Units
Outstanding Shares and Units:
Noncontrolling common units ( in shares )	1,133,562	1,150,574
Noncontrolling common units \| Common Units
Outstanding Shares and Units:
Noncontrolling common units ( in shares )	1,133,562	1,150,574
Common stockholders and noncontrolling unitholders
Dividends and Distributions payable to:
Accrued distributions	$ 65,009	$ 64,850
Common stockholders
Dividends and Distributions payable to:
Accrued distributions	$ 63,921	$ 63,745
Outstanding Shares and Units:
Common stock (in shares)	118,372,451	118,046,674
Common Units
Dividends and Distributions payable to:
Accrued distributions	$ 612	$ 621

Partners' Capital of the Operating Partnership - At-The-Market Stock Offering, Common Units and Accrued Distributions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accrued distributions
Accrued distributions	$ 65,009	$ 64,850
Operating Partnership
General Partners' Capital Account
Ownership interest (percent)	99.10%	99.00%
Kilroy Realty L.P.
Accrued distributions
Accrued distributions	$ 65,009	$ 64,850
Kilroy Realty L.P. \| Restricted Stock Units (RSUs)
Accrued distributions
Accrued distributions	$ 476	$ 484
RSUs (in shares)	846,072	861,385
Kilroy Realty L.P. \| Market measure-based Restricted Stock Units (RSUs)
Accrued distributions
Number of RSUs outstanding (in shares)	1,394,111	926,695
Kilroy Realty L.P. \| Partners’ Capital
Accrued distributions
Accrued distributions	$ 65,009	$ 64,850
Kilroy Realty L.P. \| Partners capital general partner
Accrued distributions
Accrued distributions	63,921	63,745
Kilroy Realty L.P. \| Partners capital limited partner
Accrued distributions
Accrued distributions	$ 612	$ 621
Non-Affiliated Investors \| Operating Partnership
General Partners' Capital Account
Ownership interest (percent)	0.90%	1.00%
Common Units \| Kilroy Realty L.P.
General Partners' Capital Account
Company owned common units in the Operating Partnership (in shares)	118,372,451	118,046,674
Non-affiliated investors and other common units of the Operating Partnership (in shares)	1,133,562	1,150,574
Common Units \| Non-Affiliated Investors
General Partners' Capital Account
Non-affiliated investors and other common units of the Operating Partnership (in shares)	1,133,562	1,150,574

Share-Based and Other Compensation - Stockholder Approved Share-Based Incentive Compensation Plan (Details) shares in Millions	Dec. 31, 2025 compensation_plan shares
Share-Based Payment Arrangement [Abstract]
Number of share-based incentive compensation plans \| compensation_plan	1
Effective registration shares (in shares)	12.6
Number of shares available for grant (in shares)	1.8

Share-Based and Other Compensation - Annual Performance-Based RSU Grants (Details) - Performance-Based RSUs	12 Months Ended
	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting, achievement of pre-set FFO per share goals, percentage of RSUs	100.00%
Vesting criteria, one (percent)	50.00%
Vesting criteria, two (percent)	50.00%
Number of shares issuable per RSU	1

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Share-Based and Other Compensation - Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
2025 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value on valuation date	$ 11.3
Weighted average grant date fair value, granted (dollars per share)	$ 36.49
Expected share price volatility	38.00%
Risk-free interest rate	4.35%
2025 Performance-Based RSUs \| Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	308,671
2025 Performance-Based RSUs \| Market measure-based RSUs earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated RSUs earned (in shares)	472,942
2024 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value on valuation date		$ 9.5
Weighted average grant date fair value, granted (dollars per share)		$ 35.66
Expected share price volatility		34.00%
Risk-free interest rate		3.98%
2024 Performance-Based RSUs \| Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)		265,205
2024 Performance-Based RSUs \| Market measure-based RSUs earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated RSUs earned (in shares)		474,214
2023 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value on valuation date			$ 12.0
Weighted average grant date fair value, granted (dollars per share)			$ 39.95
Expected share price volatility			35.00%
Risk-free interest rate			4.12%
2023 Performance-Based RSUs \| Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			300,007
2023 Performance-Based RSUs \| Market measure-based RSUs earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated RSUs earned (in shares)			729,890

Share-Based and Other Compensation - Summary of Performance-Based RSUs activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)		0
Market measure-based Restricted Stock Units (RSUs)
Weighted-Average Grant-Date Fair Value Per Share
Outstanding beginning balance ( in dollars per share)		$ 42.26
Granted ( in dollars per share)		36.49
Performance award achievement (in dollars per share)		36.51
Vested (in dollars per share)		62.93
Settled (in dollars per share)		0
Issuance of dividend equivalents ( in dollars per share)		35.87
Canceled (in dollars per share)		37.24
Outstanding ending balance (in dollars per share)	$ 37.11	$ 37.11
Nonvested Restricted Stock Units RSU \| Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)		926,695
Granted (in shares)	308,671	308,671	265,205	300,007
Performance award achievement (in shares)		294,387
Vested (in shares)		183,474
Issuance of dividend equivalents (in shares)		91,948
Canceled (in shares)		(44,116)
Number of RSUs outstanding, ending balance (in shares)	1,394,111	1,394,111
Weighted-Average Grant-Date Fair Value Per Share
Granted ( in dollars per share)	$ 36.49		$ 35.66	$ 39.95
Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested (in shares)	190,826		1,089,879	290,570
Vested Restricted Stock Units RSU \| Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)		81,274
Granted (in shares)		0
Performance award achievement (in shares)		0
Vested (in shares)		183,474
Settled (in shares)		(137,016)
Issuance of dividend equivalents (in shares)		7,352
Canceled (in shares)		0
Vested RSUs, ending balance (in shares)	135,084	135,084
Restricted Stock Units (RSUs) \| Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)		1,007,969
Granted (in shares)		308,671
Performance award achievement (in shares)		294,387
Vested (in shares)		0
Settled (in shares)		(137,016)
Issuance of dividend equivalents (in shares)		99,300
Canceled (in shares)		(44,116)
Total RSUs, ending balance (in shares)	1,529,195	1,529,195

Share-Based and Other Compensation - Schedule of Performance-Based RSUs Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	190,826		1,089,879	290,570
Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share on valuation date ( in dollars per share)		$ 36.49
Market measure-based Restricted Stock Units (RSUs) \| Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	308,671	308,671	265,205	300,007
Fair value per share on valuation date ( in dollars per share)	$ 36.49		$ 35.66	$ 39.95
Vested (in shares)		183,474
Market measure-based Restricted Stock Units (RSUs) \| Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Vested (in shares)		183,474
Total Fair Value at Vest Date	$ 7,016		$ 38,364	$ 11,105

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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+ Details

Share-Based and Other Compensation - Time-Based RSU Grants (Details) - Time-Based RSUs	12 Months Ended
	Dec. 31, 2025 installment shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of installments \| installment	3
Right to receive number of shares (in shares) \| shares	1

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Share-Based and Other Compensation - Summary of Time-Based RSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)		0
Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested (in shares)	(190,826)		(1,089,879)	(290,570)
Time-Based Restricted Stock Units (RSUs) \| Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)		537,426
Granted (in shares)		258,356
Vested (in shares)		(313,893)
Settled (in shares)		0
Issuance of dividend equivalents (in shares)		27,154
Forfeited (in shares)		(25,401)
Number of RSUs outstanding, ending balance (in shares)	483,642	483,642
Weighted Average Grant-Date Fair Value Per Share
Outstanding beginning balance ( in dollars per share)		$ 36.37
Granted ( in dollars per share)		34.66
Vested (in dollars per share)		40.85
Settled (in dollars per share)		0
Issuance of dividend equivalents ( in dollars per share)		35.87
Forfeited (in dollars per share)		35.81
Outstanding ending balance (in dollars per share)	$ 35.37	$ 35.37
Time-Based Restricted Stock Units (RSUs) \| Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)		242,685
Granted (in shares)		0
Vested (in shares)		(313,893)
Settled (in shares)		(347,900)
Issuance of dividend equivalents (in shares)		18,668
Forfeited (in shares)		0
Vested RSUs, ending balance (in shares)	227,346	227,346
Time-Based Restricted Stock Units (RSUs) \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)		780,111
Granted (in shares)		258,356
Vested (in shares)		0
Settled (in shares)		(347,900)
Issuance of dividend equivalents (in shares)		45,822
Forfeited (in shares)		(25,401)
Total RSUs, ending balance (in shares)	710,988	710,988
Market measure-based Restricted Stock Units (RSUs)
Weighted Average Grant-Date Fair Value Per Share
Outstanding beginning balance ( in dollars per share)		$ 42.26
Granted ( in dollars per share)		36.49
Vested (in dollars per share)		62.93
Settled (in dollars per share)		0
Issuance of dividend equivalents ( in dollars per share)		35.87
Forfeited (in dollars per share)		37.24
Outstanding ending balance (in dollars per share)	$ 37.11	$ 37.11
Market measure-based Restricted Stock Units (RSUs) \| Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)		926,695
Granted (in shares)	308,671	308,671	265,205	300,007
Vested (in shares)		(183,474)
Issuance of dividend equivalents (in shares)		91,948
Forfeited (in shares)		(44,116)
Number of RSUs outstanding, ending balance (in shares)	1,394,111	1,394,111
Weighted Average Grant-Date Fair Value Per Share
Granted ( in dollars per share)	$ 36.49		$ 35.66	$ 39.95
Market measure-based Restricted Stock Units (RSUs) \| Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)		81,274
Granted (in shares)		0
Vested (in shares)		(183,474)
Settled (in shares)		(137,016)
Issuance of dividend equivalents (in shares)		7,352
Forfeited (in shares)		0
Vested RSUs, ending balance (in shares)	135,084	135,084
Market measure-based Restricted Stock Units (RSUs) \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)		1,007,969
Granted (in shares)		308,671
Vested (in shares)		0
Settled (in shares)		(137,016)
Issuance of dividend equivalents (in shares)		99,300
Forfeited (in shares)		(44,116)
Total RSUs, ending balance (in shares)	1,529,195	1,529,195

Share-Based and Other Compensation - Time-Based RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	190,826	1,089,879	290,570
Restricted Stock Units (RSUs) \| Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	258,356	385,718	247,017
Fair value per share on valuation date ( in dollars per share)	$ 34.66	$ 36.12	$ 38.12
Restricted Stock Units (RSUs) \| Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	332,561	281,168	343,334
Total Fair Value at Vest Date	$ 12,236	$ 10,878	$ 12,425

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
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-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Subparagraph (f)(2)(iii)
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-Topic 718
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-Name Accounting Standards Codification
-Section 50
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-Section 50
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 718
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-Section 35
-Paragraph 1D
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Share-Based and Other Compensation - Share-Based Compensation Cost and Other Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 24.0	$ 24.4	$ 43.7
Share-based compensation expense capitalized	4.9	$ 6.8	6.9
Share-based compensation not yet recognized	$ 26.5
Share-based compensation not yet recognized period of recognition	1 year 8 months 12 days
Severance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 27.3

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Employee Benefit Plans (Details) - USD ($)	12 Months Ended
Employee Benefit Plans (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
401(k) plan, maximum participant deferral percent	60.00%
401(k) plan, employer match per dollar of participant contribution	$ 0.50
401(k) plan, maximum employer match percentage	10.00%
401(k) plan, contributions made	$ 1,700,000	$ 1,800,000	$ 1,700,000
Deferred Compensation, maximum participant deferral percent	70.00%
Deferred Compensation, maximum director fees and bonuses that may be deferred (percent)	100.00%
Deferred Compensation, mandatory Company contributions as percentage of gross monthly salary (percent)	10.00%
Deferred Compensation, liability under plan	$ 30,200,000	$ 27,400,000

Rental Income and Future Minimum Rent - Rental income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Fixed lease payments	$ 900,285	$ 923,029	$ 944,618
Variable lease payments	194,374	197,502	184,672
Net collectability reversals	(1,072)	(2,416)	(11,553)
Total rental income	$ 1,093,587	$ 1,118,115	$ 1,117,737

Rental Income and Future Minimum Rent - Future Contractual Minimum Rent (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Future contractual minimum rent under operating lease
2026	$ 769,406
2027	769,403
2028	742,321
2029	666,034
2030	583,844
Thereafter	1,591,508
Total	$ 5,122,516

Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) groundLease	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Long-term Purchase Commitment [Line Items]
Commitments for contracts and executed leases, operating and redevelopment and development properties \| $	$ 283.9
Weighted average discount rate, ground leases	4.67%
Weighted average remaining lease term	62 years
Variable lease, cost \| $	$ 5.0	$ 4.7	$ 4.0
Ten year ground lease extension option
Long-term Purchase Commitment [Line Items]
Number of extension options \| groundLease	3
Ground lease extension option term	10 years
Forty-five year ground lease extension option
Long-term Purchase Commitment [Line Items]
Number of extension options \| groundLease	1
Ground lease extension option term	45 years

Commitments and Contingencies - Minimum Commitment Under Ground Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Minimum commitment under our ground leases
2026	$ 6,809
2027	6,850
2028	6,869
2029	6,869
2030	6,869
Thereafter	360,875
Total undiscounted cash flows	395,141
Present value discount	(267,513)
Ground lease liabilities	$ 127,628	$ 128,422
Period for ground lease rentals adjustment based on Consumer Price Index	5 years
Period for ground lease rentals adjustment based on third-party appraisals	15 years
Period after which ground lease rentals are adjusted	5 years
Duration of ground lease increase	10 years
Average annual percentage rent for previous ten years (percent)	60.00%
Previous period included in average annual rent percentage for ten-year increases	3 years
Ground lease fixed ground rent increase, percent	5.00%
Percentage rent increase every year	2.00%
Ground lease reset period	10 years
Remaining ground lease obligation period	10 years
Ground lease variable rental payment as percentage of gross income	1.50%

Commitment and Contingencies - Accrued Environmental Remediation Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Environmental liabilities	Environmental liabilities
Environmental liabilities
Other Commitments [Line Items]
Accrued environmental remediation liabilities	$ 70,030	$ 72,003

Fair Value Measurements and Disclosures - Assets and Liabilities Reported at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value (Level 1)
Assets and Liabilities Reported at Fair Value
Deferred compensation plan assets	$ 30,807	$ 27,965

Fair Value Measurements and Disclosures - Financial Instruments Disclosed at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
December 31, 2025 \| Secured debt, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	$ 592,685	$ 598,199
December 31, 2025 \| Unsecured debt, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	3,996,774	3,999,566
Fair value \| Secured debt, net \| Fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	587,244	569,061
Fair value \| Unsecured debt, net \| Fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	$ 3,834,485	$ 3,681,914

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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+ Details

Net Income Available to Common Stockholders Per Share of the Company - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income available to common stockholders	$ 276,121	$ 210,969	$ 212,241
Allocation to participating securities	(925)	(1,967)	(1,233)
Numerator for basic and diluted net income available to common stockholders	$ 275,196	$ 209,002	$ 211,008
Denominator:
Basic weighted average vested shares outstanding (in shares)	118,278,990	117,649,111	117,160,173
Effect of dilutive securities (in shares)	553,045	507,876	346,082
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	118,832,035	118,156,987	117,506,255
Basic earnings per share:
Net income available to common stockholders per share - basic ( in dollars per share)	$ 2.33	$ 1.78	$ 1.80
Diluted earnings per share:
Net income available to common stockholders per share - diluted (in dollars per share)	$ 2.32	$ 1.77	$ 1.80

Net Income Available to Common Unitholders Per Unit of the Operating Partnership - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income	$ 302,640	$ 232,954	$ 238,288
Net income available to common unitholders	276,121	210,969	212,241
Allocation to participating securities	(925)	(1,967)	(1,233)
Numerator for basic and diluted net income available to common unitholders	$ 275,196	$ 209,002	$ 211,008
Denominator:
Basic weighted average vested units outstanding (in shares)	118,278,990	117,649,111	117,160,173
Effect of dilutive securities (in shares)	553,045	507,876	346,082
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	118,832,035	118,156,987	117,506,255
Basic earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 2.33	$ 1.78	$ 1.80
Diluted earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 2.32	$ 1.77	$ 1.80
Kilroy Realty L.P.
Numerator:
Net income	$ 302,640	$ 232,954	$ 238,288
Net income available to common unitholders	278,803	213,031	214,324
Allocation to participating securities	(925)	(1,967)	(1,233)
Numerator for basic and diluted net income available to common unitholders	$ 277,878	$ 211,064	$ 213,091
Denominator:
Basic weighted average vested units outstanding (in shares)	119,428,865	118,799,685	118,310,747
Effect of dilutive securities (in shares)	553,045	507,876	346,082
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	119,981,910	119,307,561	118,656,829
Basic earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 2.33	$ 1.78	$ 1.80
Diluted earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 2.32	$ 1.77	$ 1.80
Kilroy Realty L.P. \| Partners’ Capital
Numerator:
Net income	$ 278,803	$ 213,031	$ 214,324

Supplemental Cash Flows Information of the Company and the Operating Partnership - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Significant Noncash Transactions [Line Items]
Capitalized interest	$ 79,542	$ 77,871	$ 74,052
Cash paid for interest, net of capitalized interest of $79,542, $77,871, and $74,052 as of December 31, 2025, 2024, and 2023, respectively	115,912	126,668	105,767
Cash paid for amounts included in the measurement of ground lease liabilities	7,578	6,484	6,733
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	62,570	54,190	95,575
Tenant improvements funded directly by tenants	3,026	2,745	7,364
Remeasurement of ground lease liability and related right of use ground lease asset	0	4,782	0
NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 12)	65,009	64,850	64,440
Kilroy Realty L.P.
Other Significant Noncash Transactions [Line Items]
Capitalized interest	79,542	77,871	74,052
Cash paid for interest, net of capitalized interest of $79,542, $77,871, and $74,052 as of December 31, 2025, 2024, and 2023, respectively	115,912	126,668	105,767
Cash paid for amounts included in the measurement of ground lease liabilities	7,578	6,484	6,733
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	62,570	54,190	95,575
Tenant improvements funded directly by tenants	3,026	2,745	7,364
Remeasurement of ground lease liability and related right of use ground lease asset	0	4,782	0
NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 12)	$ 65,009	$ 64,850	$ 64,440

Tax Treatment of Distributions - Dividends (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Tax Treatment of Distributions [Abstract]
Dividends declared per share of common stock ( in dollars per share)	$ 2.16	$ 2.16	$ 2.16
Less: Dividends declared in the current year and paid in the following year ( in dollars per share)	(0.54)	(0.54)	(0.54)
Add: Dividends declared in the prior year and paid in the current year ( in dollars per share)	0.54	0.54	0.54
Dividends paid per share of common stock (in dollars per share)	$ 2.16	$ 2.16	$ 2.16

Tax Treatment of Distributions - Dividends Tax Treatment (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 2.16	$ 2.16	$ 2.16
Ordinary income \| Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 1.43	$ 1.92	$ 2.09
Dividends paid per share of common stock, percentage	66.34%	88.75%	96.67%
Return of capital \| Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0.25	$ 0.24	$ 0.07
Dividends paid per share of common stock, percentage	11.62%	11.02%	3.21%
Capital gains \| Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0.04	$ 0.01	$ 0
Dividends paid per share of common stock, percentage	1.76%	0.23%	0.12%
Unrecaptured section 1250 gains \| Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0.44	$ 0	$ 0
Dividends paid per share of common stock, percentage	20.28%	0.00%	0.00%
Tax treatment \| Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 2.16	$ 2.16	$ 2.16
Dividends paid per share of common stock, percentage	100.00%	100.00%	100.00%

Segments (Details) $ in Thousands	12 Months Ended
Segments (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2025 reportableSegment	Dec. 31, 2025 operatingSegment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of operating segments		1	1
Number of reportable segments \| reportableSegment		1
Revenues:
Rental income	$ 1,093,587			$ 1,118,115	$ 1,117,737
Other property income	19,080			17,514	11,957
Total revenues	1,112,667			1,135,629	1,129,694
Expenses:
Property expenses	243,726			243,441	228,964
Real estate taxes	107,564			108,951	105,868
Ground leases	12,048			11,715	9,732
General and administrative expenses	73,108			71,074	94,264
Leasing costs	10,352			8,764	6,506
Depreciation and amortization	354,854			356,182	355,278
Total expenses	801,652			800,127	800,612
Other Income (Expenses):
Interest income	6,970			37,752	22,592
Interest expense	(126,292)			(145,287)	(114,216)
Other income (expense)	168			(992)	830
Gains on sales of depreciable operating properties	127,038			0	0
Impairment of real estate assets	16,259			0	0
Gain on sale of long-lived assets	0			5,979	0
Total other expenses	(8,375)			(102,548)	(90,794)
Net income	302,640			232,954	238,288
Office and Life Science Properties Segment
Revenues:
Rental income	1,093,587			1,118,115	1,117,737
Other property income	19,080			17,514	11,957
Total revenues	1,112,667			1,135,629	1,129,694
Expenses:
Property expenses	243,726			243,441	228,964
Real estate taxes	107,564			108,951	105,868
Ground leases	12,048			11,715	9,732
General and administrative expenses	73,108			71,074	94,264
Leasing costs	10,352			8,764	6,506
Depreciation and amortization	354,854			356,182	355,278
Total expenses	801,652			800,127	800,612
Other Income (Expenses):
Interest income	6,970			37,752	22,592
Interest expense	(126,292)			(145,287)	(114,216)
Other income (expense)	168			(992)	830
Gains on sales of depreciable operating properties	127,038			0	0
Impairment of real estate assets	(16,259)			0	0
Gain on sale of long-lived assets	0			5,979	0
Total other expenses	(8,375)			(102,548)	(90,794)
Net income	$ 302,640			$ 232,954	$ 238,288

Schedule II - Valuation and Qualifying Accounts - Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Uncollectible tenant receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 314	$ 1,567	$ 2,233
Charged to Costs and Expenses	420	374	1,524
Deductions	(490)	(1,627)	(2,190)
Balance at End of Period	244	314	1,567
Allowance for deferred rent
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	0	728	965
Charged to Costs and Expenses	1	0	667
Deductions	(1)	(728)	(904)
Balance at End of Period	$ 0	$ 0	$ 728

Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) $ in Thousands	Dec. 31, 2025 USD ($) ft² property development_project	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 600,442
Initial cost, land and improvements	2,338,175
Initial cost, buildings and Improvements	3,163,966
Costs Capitalized Subsequent to Acquisition/ Improvement	7,033,000
Land and improvements, gross	2,429,553
Buildings and improvements, gross	10,105,588
Land and improvements and buildings and improvements, gross	12,535,141
Accumulated Depreciation	$ 2,843,811	$ 2,824,616	$ 2,518,304	$ 2,218,710
Rentable square feet (unaudited) \| ft²	16,292,164
Unamortized deferred financing costs	$ (9,150)	(12,692)
Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	4,625,442
Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Unamortized deferred financing costs	(7,757)	(8,489)
3.57% Mortgage Payable due December 2026 \| Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	148,800
3.57% Mortgage Payable due December 2026 \| Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	148,815	152,668
5.90% Mortgage Payable due August 2034 \| Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000
5.90% Mortgage Payable due August 2034 \| Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000	375,000
4.48% Mortgage Payable due July 2027 \| Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	$ 76,627	$ 79,020
Building
Real Estate and Accumulated Depreciation [Line Items]
Depreciation life	35 years
Tenant Improvements \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property, plant and equipment, useful life	1 year
Tenant Improvements \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property, plant and equipment, useful life	20 years
In-process development project - tenant improvement
Real Estate and Accumulated Depreciation [Line Items]
Rentable square feet (unaudited) \| ft²	871,738
Number of buildings \| development_project	1
345 N. Maple Drive, Beverly Hills, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 28,986
Initial cost, buildings and Improvements	154,148
Costs Capitalized Subsequent to Acquisition/ Improvement	305
Land and improvements, gross	28,986
Buildings and improvements, gross	154,453
Land and improvements and buildings and improvements, gross	183,439
Accumulated Depreciation	$ 2,356
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	306,366
3101 - 3243 S. La Cienega Blvd., Culver City, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 150,718
Initial cost, buildings and Improvements	31,033
Costs Capitalized Subsequent to Acquisition/ Improvement	8,524
Land and improvements, gross	150,718
Buildings and improvements, gross	39,557
Land and improvements and buildings and improvements, gross	190,275
Accumulated Depreciation	$ 29,276
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	166,207
2240 E. Imperial Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,044
Initial cost, buildings and Improvements	11,763
Costs Capitalized Subsequent to Acquisition/ Improvement	30,740
Land and improvements, gross	1,048
Buildings and improvements, gross	42,499
Land and improvements and buildings and improvements, gross	43,547
Accumulated Depreciation	$ 33,616
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	122,870
2250 E. Imperial Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,579
Initial cost, buildings and Improvements	29,062
Costs Capitalized Subsequent to Acquisition/ Improvement	38,157
Land and improvements, gross	2,547
Buildings and improvements, gross	67,251
Land and improvements and buildings and improvements, gross	69,798
Accumulated Depreciation	$ 63,889
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	298,728
2260 E. Imperial Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,518
Initial cost, buildings and Improvements	28,370
Costs Capitalized Subsequent to Acquisition/ Improvement	38,003
Land and improvements, gross	2,547
Buildings and improvements, gross	66,344
Land and improvements and buildings and improvements, gross	68,891
Accumulated Depreciation	$ 29,746
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	298,728
909 N. Pacific Coast Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,577
Initial cost, buildings and Improvements	34,042
Costs Capitalized Subsequent to Acquisition/ Improvement	60,611
Land and improvements, gross	3,565
Buildings and improvements, gross	94,665
Land and improvements and buildings and improvements, gross	98,230
Accumulated Depreciation	$ 61,673
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	244,880
999 N. Pacific Coast Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,407
Initial cost, buildings and Improvements	34,326
Costs Capitalized Subsequent to Acquisition/ Improvement	19,308
Land and improvements, gross	1,407
Buildings and improvements, gross	53,634
Land and improvements and buildings and improvements, gross	55,041
Accumulated Depreciation	$ 37,781
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	138,389
3750 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	1,941
Costs Capitalized Subsequent to Acquisition/ Improvement	13,718
Land and improvements, gross	0
Buildings and improvements, gross	15,659
Land and improvements and buildings and improvements, gross	15,659
Accumulated Depreciation	$ 13,660
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	10,718
3760 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	17,467
Costs Capitalized Subsequent to Acquisition/ Improvement	24,161
Land and improvements, gross	0
Buildings and improvements, gross	41,628
Land and improvements and buildings and improvements, gross	41,628
Accumulated Depreciation	$ 35,657
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	166,761
3780 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	22,319
Costs Capitalized Subsequent to Acquisition/ Improvement	41,190
Land and improvements, gross	0
Buildings and improvements, gross	63,509
Land and improvements and buildings and improvements, gross	63,509
Accumulated Depreciation	$ 53,312
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	221,452
3800 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	19,408
Costs Capitalized Subsequent to Acquisition/ Improvement	25,856
Land and improvements, gross	0
Buildings and improvements, gross	45,264
Land and improvements and buildings and improvements, gross	45,264
Accumulated Depreciation	$ 35,231
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	192,476
3840 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	13,586
Costs Capitalized Subsequent to Acquisition/ Improvement	33,409
Land and improvements, gross	0
Buildings and improvements, gross	46,995
Land and improvements and buildings and improvements, gross	46,995
Accumulated Depreciation	$ 25,243
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	138,441
3880 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	9,704
Costs Capitalized Subsequent to Acquisition/ Improvement	18,398
Land and improvements, gross	0
Buildings and improvements, gross	28,102
Land and improvements and buildings and improvements, gross	28,102
Accumulated Depreciation	$ 8,721
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	96,922
3900 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	12,615
Costs Capitalized Subsequent to Acquisition/ Improvement	23,741
Land and improvements, gross	0
Buildings and improvements, gross	36,356
Land and improvements and buildings and improvements, gross	36,356
Accumulated Depreciation	$ 24,566
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	130,935
1350 Ivar Ave., Los Angeles, CA (5)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,575
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	14,276
Land and improvements, gross	1,575
Buildings and improvements, gross	14,276
Land and improvements and buildings and improvements, gross	15,851
Accumulated Depreciation	$ 2,104
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	16,448
1355 Vine St., Los Angeles, CA (5)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 17,588
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	120,294
Land and improvements, gross	17,588
Buildings and improvements, gross	120,294
Land and improvements and buildings and improvements, gross	137,882
Accumulated Depreciation	$ 18,232
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	183,129
1375 Vine St., Los Angeles, CA (5)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 15,578
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	103,368
Land and improvements, gross	15,578
Buildings and improvements, gross	103,368
Land and improvements and buildings and improvements, gross	118,946
Accumulated Depreciation	$ 15,626
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	159,236
1395 Vine St., Los Angeles, CA (5)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 278
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	3,261
Land and improvements, gross	278
Buildings and improvements, gross	3,261
Land and improvements and buildings and improvements, gross	3,539
Accumulated Depreciation	$ 481
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	2,575
1500 N. El Centro Ave., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,235
Initial cost, buildings and Improvements	21
Costs Capitalized Subsequent to Acquisition/ Improvement	64,156
Land and improvements, gross	9,235
Buildings and improvements, gross	64,177
Land and improvements and buildings and improvements, gross	73,412
Accumulated Depreciation	$ 21,890
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	113,447
1525 N. Gower St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,318
Initial cost, buildings and Improvements	3
Costs Capitalized Subsequent to Acquisition/ Improvement	9,774
Land and improvements, gross	1,318
Buildings and improvements, gross	9,777
Land and improvements and buildings and improvements, gross	11,095
Accumulated Depreciation	$ 3,374
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	9,610
1575 N. Gower St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,153
Initial cost, buildings and Improvements	51
Costs Capitalized Subsequent to Acquisition/ Improvement	120,294
Land and improvements, gross	22,153
Buildings and improvements, gross	120,345
Land and improvements and buildings and improvements, gross	142,498
Accumulated Depreciation	$ 33,933
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	264,430
6115 W. Sunset Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,313
Initial cost, buildings and Improvements	3
Costs Capitalized Subsequent to Acquisition/ Improvement	17,259
Land and improvements, gross	2,455
Buildings and improvements, gross	16,120
Land and improvements and buildings and improvements, gross	18,575
Accumulated Depreciation	$ 6,235
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	26,238
6121 W. Sunset Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 11,120
Initial cost, buildings and Improvements	4,256
Costs Capitalized Subsequent to Acquisition/ Improvement	42,373
Land and improvements, gross	8,703
Buildings and improvements, gross	49,046
Land and improvements and buildings and improvements, gross	57,749
Accumulated Depreciation	$ 14,678
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	93,418
8560 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,720
Initial cost, buildings and Improvements	50,956
Costs Capitalized Subsequent to Acquisition/ Improvement	8,435
Land and improvements, gross	9,720
Buildings and improvements, gross	59,391
Land and improvements and buildings and improvements, gross	69,111
Accumulated Depreciation	$ 19,995
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	76,359
8570 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 31,693
Initial cost, buildings and Improvements	27,974
Costs Capitalized Subsequent to Acquisition/ Improvement	7,277
Land and improvements, gross	31,693
Buildings and improvements, gross	35,251
Land and improvements and buildings and improvements, gross	66,944
Accumulated Depreciation	$ 12,137
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	49,276
8580 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,013
Initial cost, buildings and Improvements	3,695
Costs Capitalized Subsequent to Acquisition/ Improvement	1,844
Land and improvements, gross	10,013
Buildings and improvements, gross	5,539
Land and improvements and buildings and improvements, gross	15,552
Accumulated Depreciation	$ 2,047
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	6,875
8590 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 39,954
Initial cost, buildings and Improvements	27,884
Costs Capitalized Subsequent to Acquisition/ Improvement	6,157
Land and improvements, gross	39,954
Buildings and improvements, gross	34,041
Land and improvements and buildings and improvements, gross	73,995
Accumulated Depreciation	$ 11,092
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	56,750
12100 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 352
Initial cost, buildings and Improvements	45,611
Costs Capitalized Subsequent to Acquisition/ Improvement	30,156
Land and improvements, gross	9,633
Buildings and improvements, gross	66,486
Land and improvements and buildings and improvements, gross	76,119
Accumulated Depreciation	$ 41,670
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	155,679
12200 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,329
Initial cost, buildings and Improvements	35,488
Costs Capitalized Subsequent to Acquisition/ Improvement	32,085
Land and improvements, gross	3,977
Buildings and improvements, gross	67,925
Land and improvements and buildings and improvements, gross	71,902
Accumulated Depreciation	$ 52,690
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	154,544
12233 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,100
Initial cost, buildings and Improvements	53,170
Costs Capitalized Subsequent to Acquisition/ Improvement	7,147
Land and improvements, gross	22,100
Buildings and improvements, gross	60,317
Land and improvements and buildings and improvements, gross	82,417
Accumulated Depreciation	$ 25,998
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	156,746
12312 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,325
Initial cost, buildings and Improvements	12,202
Costs Capitalized Subsequent to Acquisition/ Improvement	12,741
Land and improvements, gross	3,399
Buildings and improvements, gross	24,869
Land and improvements and buildings and improvements, gross	28,268
Accumulated Depreciation	$ 21,516
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	78,900
2100/2110 Colorado Ave., Santa Monica, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,474
Initial cost, buildings and Improvements	26,087
Costs Capitalized Subsequent to Acquisition/ Improvement	21,796
Land and improvements, gross	5,476
Buildings and improvements, gross	47,881
Land and improvements and buildings and improvements, gross	53,357
Accumulated Depreciation	$ 35,412
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	104,853
12225 El Camino Real, San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,700
Initial cost, buildings and Improvements	9,633
Costs Capitalized Subsequent to Acquisition/ Improvement	4,890
Land and improvements, gross	1,673
Buildings and improvements, gross	14,550
Land and improvements and buildings and improvements, gross	16,223
Accumulated Depreciation	$ 11,750
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	58,401
12235 El Camino Real, San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,507
Initial cost, buildings and Improvements	8,543
Costs Capitalized Subsequent to Acquisition/ Improvement	10,461
Land and improvements, gross	1,540
Buildings and improvements, gross	18,971
Land and improvements and buildings and improvements, gross	20,511
Accumulated Depreciation	$ 15,572
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	53,751
El Camino Real, San Diego, California Three
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,201
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	40,640
Land and improvements, gross	4,201
Buildings and improvements, gross	40,640
Land and improvements and buildings and improvements, gross	44,841
Accumulated Depreciation	$ 6,474
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	110,950
El Camino Real, San Diego, California Four
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,453
Initial cost, buildings and Improvements	11,981
Costs Capitalized Subsequent to Acquisition/ Improvement	12,910
Land and improvements, gross	3,453
Buildings and improvements, gross	24,891
Land and improvements and buildings and improvements, gross	28,344
Accumulated Depreciation	$ 16,959
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	73,238
El Camino Real, San Diego, California Five
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,360
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	37,329
Land and improvements, gross	9,360
Buildings and improvements, gross	37,329
Land and improvements and buildings and improvements, gross	46,689
Accumulated Depreciation	$ 10,747
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	75,035
El Camino Real, San Diego, California Six
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,398
Initial cost, buildings and Improvements	54,954
Costs Capitalized Subsequent to Acquisition/ Improvement	24,329
Land and improvements, gross	18,398
Buildings and improvements, gross	79,283
Land and improvements and buildings and improvements, gross	97,681
Accumulated Depreciation	$ 35,624
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	140,591
El Camino Real, San Diego, California Seven
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,252
Initial cost, buildings and Improvements	21,236
Costs Capitalized Subsequent to Acquisition/ Improvement	17,163
Land and improvements, gross	10,252
Buildings and improvements, gross	38,399
Land and improvements and buildings and improvements, gross	48,651
Accumulated Depreciation	$ 16,560
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	87,944
El Camino Real, San Diego, California Eight
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 28,645
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	113,232
Land and improvements, gross	28,645
Buildings and improvements, gross	113,232
Land and improvements and buildings and improvements, gross	141,877
Accumulated Depreciation	$ 20,696
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	196,444
El Camino Real, San Diego, California Nine
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 11,326
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	53,257
Land and improvements, gross	11,326
Buildings and improvements, gross	53,257
Land and improvements and buildings and improvements, gross	64,583
Accumulated Depreciation	$ 9,658
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	92,042
High Bluff Drive, San Diego, California One
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,629
Initial cost, buildings and Improvements	3,096
Costs Capitalized Subsequent to Acquisition/ Improvement	10,270
Land and improvements, gross	1,629
Buildings and improvements, gross	13,366
Land and improvements and buildings and improvements, gross	14,995
Accumulated Depreciation	$ 10,115
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	39,192
High Bluff Drive, San Diego, California Two
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 15,167
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	50,063
Land and improvements, gross	15,167
Buildings and improvements, gross	50,063
Land and improvements and buildings and improvements, gross	65,230
Accumulated Depreciation	$ 14,629
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	216,518
High Bluff Drive, San Diego, California Three
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,013
Initial cost, buildings and Improvements	8,032
Costs Capitalized Subsequent to Acquisition/ Improvement	1,400
Land and improvements, gross	3,013
Buildings and improvements, gross	9,432
Land and improvements and buildings and improvements, gross	12,445
Accumulated Depreciation	$ 775
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	59,245
High Bluff Drive, San Diego, California Four
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,013
Initial cost, buildings and Improvements	6,134
Costs Capitalized Subsequent to Acquisition/ Improvement	782
Land and improvements, gross	3,013
Buildings and improvements, gross	6,916
Land and improvements and buildings and improvements, gross	9,929
Accumulated Depreciation	$ 573
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	44,486
Valley Centre Drive, San Diego, California One
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,167
Initial cost, buildings and Improvements	6,897
Costs Capitalized Subsequent to Acquisition/ Improvement	11,977
Land and improvements, gross	2,858
Buildings and improvements, gross	18,183
Land and improvements and buildings and improvements, gross	21,041
Accumulated Depreciation	$ 13,286
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	54,960
Valley Centre Drive, San Diego, California Two
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,184
Initial cost, buildings and Improvements	19,352
Costs Capitalized Subsequent to Acquisition/ Improvement	29,823
Land and improvements, gross	5,259
Buildings and improvements, gross	48,100
Land and improvements and buildings and improvements, gross	53,359
Accumulated Depreciation	$ 37,365
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	132,425
Valley Centre Drive, San Diego, California Three
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,038
Initial cost, buildings and Improvements	21,144
Costs Capitalized Subsequent to Acquisition/ Improvement	21,366
Land and improvements, gross	4,725
Buildings and improvements, gross	41,823
Land and improvements and buildings and improvements, gross	46,548
Accumulated Depreciation	$ 33,190
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	124,756
Valley Centre Drive, San Diego, California Four
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,297
Initial cost, buildings and Improvements	18,967
Costs Capitalized Subsequent to Acquisition/ Improvement	19,934
Land and improvements, gross	4,254
Buildings and improvements, gross	38,944
Land and improvements and buildings and improvements, gross	43,198
Accumulated Depreciation	$ 25,998
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	117,777
Valley Centre Drive, San Diego, California Five
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,452
Initial cost, buildings and Improvements	16,152
Costs Capitalized Subsequent to Acquisition/ Improvement	22,042
Land and improvements, gross	4,457
Buildings and improvements, gross	37,189
Land and improvements and buildings and improvements, gross	41,646
Accumulated Depreciation	$ 29,027
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	118,912
Paseo Place, San Diego, CA (Retail)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 24,358
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	76,879
Land and improvements, gross	24,358
Buildings and improvements, gross	76,879
Land and improvements and buildings and improvements, gross	101,237
Accumulated Depreciation	$ 16,296
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	95,871
2100 Kettner Blvd., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,861
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	113,891
Land and improvements, gross	19,861
Buildings and improvements, gross	113,891
Land and improvements and buildings and improvements, gross	133,752
Accumulated Depreciation	$ 10,557
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	212,915
2305 Historic Decatur Rd., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,240
Initial cost, buildings and Improvements	22,220
Costs Capitalized Subsequent to Acquisition/ Improvement	12,114
Land and improvements, gross	5,240
Buildings and improvements, gross	34,334
Land and improvements and buildings and improvements, gross	39,574
Accumulated Depreciation	$ 19,661
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	107,456
John Hopkins Ct., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,225
Initial cost, buildings and Improvements	31,258
Costs Capitalized Subsequent to Acquisition/ Improvement	332
Land and improvements, gross	4,262
Buildings and improvements, gross	31,553
Land and improvements and buildings and improvements, gross	35,815
Accumulated Depreciation	$ 190
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	45,589
John Hopkins Ct., San Diego, CA one
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,598
Initial cost, buildings and Improvements	33,443
Costs Capitalized Subsequent to Acquisition/ Improvement	347
Land and improvements, gross	5,647
Buildings and improvements, gross	33,741
Land and improvements and buildings and improvements, gross	39,388
Accumulated Depreciation	$ 112
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	62,739
3535 General Atomics Ct., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,433
Initial cost, buildings and Improvements	43,774
Costs Capitalized Subsequent to Acquisition/ Improvement	465
Land and improvements, gross	7,499
Buildings and improvements, gross	44,173
Land and improvements and buildings and improvements, gross	51,672
Accumulated Depreciation	$ 193
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	80,543
3535 General Atomics Ct., San Diego, CA One
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,057
Initial cost, buildings and Improvements	24,355
Costs Capitalized Subsequent to Acquisition/ Improvement	253
Land and improvements, gross	4,093
Buildings and improvements, gross	24,572
Land and improvements and buildings and improvements, gross	28,665
Accumulated Depreciation	$ 84
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	43,295
4690 Executive Dr., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,623
Initial cost, buildings and Improvements	19,686
Costs Capitalized Subsequent to Acquisition/ Improvement	1,368
Land and improvements, gross	1,624
Buildings and improvements, gross	21,053
Land and improvements and buildings and improvements, gross	22,677
Accumulated Depreciation	$ 1,447
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	52,074
9455 Towne Centre Dr., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,081
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	79,595
Land and improvements, gross	6,081
Buildings and improvements, gross	79,595
Land and improvements and buildings and improvements, gross	85,676
Accumulated Depreciation	$ 12,233
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	160,444
9514 Towne Centre Dr., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,928
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	47,756
Land and improvements, gross	4,928
Buildings and improvements, gross	47,756
Land and improvements and buildings and improvements, gross	52,684
Accumulated Depreciation	$ 3,451
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	70,616
4100 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,835
Initial cost, buildings and Improvements	15,526
Costs Capitalized Subsequent to Acquisition/ Improvement	1,525
Land and improvements, gross	4,860
Buildings and improvements, gross	17,026
Land and improvements and buildings and improvements, gross	21,886
Accumulated Depreciation	$ 7,743
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	47,643
4200 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs Capitalized Subsequent to Acquisition/ Improvement	8,414
Land and improvements, gross	4,662
Buildings and improvements, gross	23,956
Land and improvements and buildings and improvements, gross	28,618
Accumulated Depreciation	$ 11,723
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	43,600
4300 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,958
Costs Capitalized Subsequent to Acquisition/ Improvement	8,047
Land and improvements, gross	6,470
Buildings and improvements, gross	29,062
Land and improvements and buildings and improvements, gross	35,532
Accumulated Depreciation	$ 14,265
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	63,430
4400 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,939
Initial cost, buildings and Improvements	43,213
Costs Capitalized Subsequent to Acquisition/ Improvement	3,115
Land and improvements, gross	4,939
Buildings and improvements, gross	46,328
Land and improvements and buildings and improvements, gross	51,267
Accumulated Depreciation	$ 2,589
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	48,414
4500 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,957
Costs Capitalized Subsequent to Acquisition/ Improvement	6,035
Land and improvements, gross	6,470
Buildings and improvements, gross	27,049
Land and improvements and buildings and improvements, gross	33,519
Accumulated Depreciation	$ 12,920
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	63,429
4600 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs Capitalized Subsequent to Acquisition/ Improvement	5,424
Land and improvements, gross	4,939
Buildings and improvements, gross	20,689
Land and improvements and buildings and improvements, gross	25,628
Accumulated Depreciation	$ 10,692
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	48,413
4700 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,958
Costs Capitalized Subsequent to Acquisition/ Improvement	1,576
Land and improvements, gross	6,470
Buildings and improvements, gross	22,591
Land and improvements and buildings and improvements, gross	29,061
Accumulated Depreciation	$ 10,384
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	63,429
1290 - 1300 Terra Bella Ave., Mountain View, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 28,730
Initial cost, buildings and Improvements	27,555
Costs Capitalized Subsequent to Acquisition/ Improvement	13,522
Land and improvements, gross	28,730
Buildings and improvements, gross	41,077
Land and improvements and buildings and improvements, gross	69,807
Accumulated Depreciation	$ 13,628
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	114,175
680 E. Middlefield Rd., Mountain View, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 34,755
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	56,759
Land and improvements, gross	34,755
Buildings and improvements, gross	56,759
Land and improvements and buildings and improvements, gross	91,514
Accumulated Depreciation	$ 21,383
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	171,676
690 E. Middlefield Rd., Mountain View, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 34,605
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	56,515
Land and improvements, gross	34,605
Buildings and improvements, gross	56,515
Land and improvements and buildings and improvements, gross	91,120
Accumulated Depreciation	$ 21,291
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	171,215
1701 Page Mill Rd., Palo Alto, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	99,522
Costs Capitalized Subsequent to Acquisition/ Improvement	117
Land and improvements, gross	0
Buildings and improvements, gross	99,639
Land and improvements and buildings and improvements, gross	99,639
Accumulated Depreciation	$ 27,030
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	128,688
3150 Porter Dr., Palo Alto, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	21,715
Costs Capitalized Subsequent to Acquisition/ Improvement	6,446
Land and improvements, gross	0
Buildings and improvements, gross	28,161
Land and improvements and buildings and improvements, gross	28,161
Accumulated Depreciation	$ 8,888
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	36,886
900 Jefferson Ave., Redwood City, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 16,668
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	109,784
Land and improvements, gross	18,063
Buildings and improvements, gross	108,389
Land and improvements and buildings and improvements, gross	126,452
Accumulated Depreciation	$ 38,994
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	228,226
900 Middlefield Rd., Redwood City, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,959
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	64,979
Land and improvements, gross	8,626
Buildings and improvements, gross	64,312
Land and improvements and buildings and improvements, gross	72,938
Accumulated Depreciation	$ 19,269
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	119,616
100 First St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 49,150
Initial cost, buildings and Improvements	131,238
Costs Capitalized Subsequent to Acquisition/ Improvement	86,415
Land and improvements, gross	49,150
Buildings and improvements, gross	217,653
Land and improvements and buildings and improvements, gross	266,803
Accumulated Depreciation	$ 125,428
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	480,457
100 Hooper St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 78,564
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	197,034
Land and improvements, gross	85,510
Buildings and improvements, gross	190,088
Land and improvements and buildings and improvements, gross	275,598
Accumulated Depreciation	$ 41,819
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	417,914
201 Third St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,260
Initial cost, buildings and Improvements	84,018
Costs Capitalized Subsequent to Acquisition/ Improvement	85,856
Land and improvements, gross	19,260
Buildings and improvements, gross	169,874
Land and improvements and buildings and improvements, gross	189,134
Accumulated Depreciation	$ 109,440
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	355,960
360 Third St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	88,235
Costs Capitalized Subsequent to Acquisition/ Improvement	128,912
Land and improvements, gross	28,504
Buildings and improvements, gross	188,643
Land and improvements and buildings and improvements, gross	217,147
Accumulated Depreciation	$ 87,745
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	436,357
250 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,630
Initial cost, buildings and Improvements	22,770
Costs Capitalized Subsequent to Acquisition/ Improvement	10,797
Land and improvements, gross	7,630
Buildings and improvements, gross	33,567
Land and improvements and buildings and improvements, gross	41,197
Accumulated Depreciation	$ 17,628
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	100,850
301 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,910
Initial cost, buildings and Improvements	22,450
Costs Capitalized Subsequent to Acquisition/ Improvement	17,817
Land and improvements, gross	5,910
Buildings and improvements, gross	40,267
Land and improvements and buildings and improvements, gross	46,177
Accumulated Depreciation	$ 19,487
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	82,834
333 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,645
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	80,685
Land and improvements, gross	18,645
Buildings and improvements, gross	80,685
Land and improvements and buildings and improvements, gross	99,330
Accumulated Depreciation	$ 23,730
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	185,602
345 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 29,405
Initial cost, buildings and Improvements	113,179
Costs Capitalized Subsequent to Acquisition/ Improvement	1,358
Land and improvements, gross	29,403
Buildings and improvements, gross	114,539
Land and improvements and buildings and improvements, gross	143,942
Accumulated Depreciation	$ 23,665
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	110,050
303 Second St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 63,550
Initial cost, buildings and Improvements	154,153
Costs Capitalized Subsequent to Acquisition/ Improvement	123,735
Land and improvements, gross	63,550
Buildings and improvements, gross	277,888
Land and improvements and buildings and improvements, gross	341,438
Accumulated Depreciation	$ 159,024
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	784,658
350 Mission St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 52,815
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	212,906
Land and improvements, gross	52,815
Buildings and improvements, gross	212,906
Land and improvements and buildings and improvements, gross	265,721
Accumulated Depreciation	$ 64,520
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	455,340
345 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 13,745
Initial cost, buildings and Improvements	18,575
Costs Capitalized Subsequent to Acquisition/ Improvement	1
Land and improvements, gross	13,745
Buildings and improvements, gross	18,576
Land and improvements and buildings and improvements, gross	32,321
Accumulated Depreciation	$ 4,504
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	40,410
347 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 14,071
Initial cost, buildings and Improvements	18,289
Costs Capitalized Subsequent to Acquisition/ Improvement	44
Land and improvements, gross	14,071
Buildings and improvements, gross	18,333
Land and improvements and buildings and improvements, gross	32,404
Accumulated Depreciation	$ 4,455
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	39,780
349 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,112
Initial cost, buildings and Improvements	22,601
Costs Capitalized Subsequent to Acquisition/ Improvement	352
Land and improvements, gross	23,112
Buildings and improvements, gross	22,953
Land and improvements and buildings and improvements, gross	46,065
Accumulated Depreciation	$ 6,824
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	65,340
350 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,719
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	177,047
Land and improvements, gross	23,719
Buildings and improvements, gross	177,047
Land and improvements and buildings and improvements, gross	200,766
Accumulated Depreciation	$ 22,614
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	234,892
352 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,449
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	165,524
Land and improvements, gross	23,449
Buildings and improvements, gross	165,524
Land and improvements and buildings and improvements, gross	188,973
Accumulated Depreciation	$ 23,061
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	232,215
354 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,538
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	141,063
Land and improvements, gross	19,538
Buildings and improvements, gross	141,063
Land and improvements and buildings and improvements, gross	160,601
Accumulated Depreciation	$ 22,126
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	193,472
Oyster Point Blvd South San Francisco CA Seven
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	0
Land and improvements, gross	0
Buildings and improvements, gross	0
Land and improvements and buildings and improvements, gross	0
Accumulated Depreciation	$ 62
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	0
10900 NE 4th St., Bellevue, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 25,080
Initial cost, buildings and Improvements	150,877
Costs Capitalized Subsequent to Acquisition/ Improvement	66,352
Land and improvements, gross	25,080
Buildings and improvements, gross	217,229
Land and improvements and buildings and improvements, gross	242,309
Accumulated Depreciation	$ 106,671
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	428,557
601 108th Ave., Bellevue, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	214,095
Costs Capitalized Subsequent to Acquisition/ Improvement	99,439
Land and improvements, gross	42,680
Buildings and improvements, gross	270,854
Land and improvements and buildings and improvements, gross	313,534
Accumulated Depreciation	$ 136,292
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	490,738
2001 8th Ave., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 84,076
Initial cost, buildings and Improvements	371,154
Costs Capitalized Subsequent to Acquisition/ Improvement	36,691
Land and improvements, gross	84,076
Buildings and improvements, gross	407,845
Land and improvements and buildings and improvements, gross	491,921
Accumulated Depreciation	$ 53,879
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	535,395
320 Westlake Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 14,710
Initial cost, buildings and Improvements	82,018
Costs Capitalized Subsequent to Acquisition/ Improvement	16,653
Land and improvements, gross	14,710
Buildings and improvements, gross	98,671
Land and improvements and buildings and improvements, gross	113,381
Accumulated Depreciation	$ 41,086
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	184,644
321 Terry Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,430
Initial cost, buildings and Improvements	60,003
Costs Capitalized Subsequent to Acquisition/ Improvement	11,066
Land and improvements, gross	10,430
Buildings and improvements, gross	71,069
Land and improvements and buildings and improvements, gross	81,499
Accumulated Depreciation	$ 30,777
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	135,755
401 Terry Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,500
Initial cost, buildings and Improvements	77,046
Costs Capitalized Subsequent to Acquisition/ Improvement	235
Land and improvements, gross	22,500
Buildings and improvements, gross	77,281
Land and improvements and buildings and improvements, gross	99,781
Accumulated Depreciation	$ 28,806
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	174,530
333 Dexter Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 42,854
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	328,064
Land and improvements, gross	42,854
Buildings and improvements, gross	328,064
Land and improvements and buildings and improvements, gross	370,918
Accumulated Depreciation	$ 48,068
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	618,766
701 N. 34th St., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	48,027
Costs Capitalized Subsequent to Acquisition/ Improvement	16,696
Land and improvements, gross	0
Buildings and improvements, gross	64,723
Land and improvements and buildings and improvements, gross	64,723
Accumulated Depreciation	$ 28,986
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	143,136
801 N. 34th St., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	58,537
Costs Capitalized Subsequent to Acquisition/ Improvement	23,925
Land and improvements, gross	0
Buildings and improvements, gross	82,462
Land and improvements and buildings and improvements, gross	82,462
Accumulated Depreciation	$ 37,188
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	173,615
837 N. 34th St., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	37,404
Costs Capitalized Subsequent to Acquisition/ Improvement	8,619
Land and improvements, gross	0
Buildings and improvements, gross	46,023
Land and improvements and buildings and improvements, gross	46,023
Accumulated Depreciation	$ 21,410
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	112,487
200 W. 6th St., Austin, TX
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	664,974
Land and improvements, gross	0
Buildings and improvements, gross	664,974
Land and improvements and buildings and improvements, gross	664,974
Accumulated Depreciation	$ 60,117
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	758,975
1550 N. El Centro Avenue, Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 16,970
Initial cost, buildings and Improvements	39
Costs Capitalized Subsequent to Acquisition/ Improvement	139,686
Land and improvements, gross	16,970
Buildings and improvements, gross	139,725
Land and improvements and buildings and improvements, gross	156,695
Accumulated Depreciation	$ 38,230
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	0
6390 De Longpre Ave., Los Angeles, CA (5)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 12,112
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	162,693
Land and improvements, gross	12,112
Buildings and improvements, gross	162,693
Land and improvements and buildings and improvements, gross	174,805
Accumulated Depreciation	$ 22,108
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	0
3200 Paseo Village Way, San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 106,419
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	272,319
Land and improvements, gross	106,419
Buildings and improvements, gross	272,319
Land and improvements and buildings and improvements, gross	378,738
Accumulated Depreciation	$ 46,203
Depreciation life	35 years
Rentable square feet (unaudited) \| ft²	0
Office Building
Real Estate and Accumulated Depreciation [Line Items]
Unamortized deferred financing costs	$ (7,800)
Office Building \| El Camino Real, San Diego, California Eight
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	375,000
Office Building \| 100 Hooper St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	148,815
Office Building \| 320 Westlake Ave. North, WA and 321 Terry Avenue North, Lake Union, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 76,627
Office Building \| Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings \| property	5
Operating Properties
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 600,442
Initial cost, land and improvements	1,550,535
Initial cost, buildings and Improvements	3,163,966
Costs Capitalized Subsequent to Acquisition/ Improvement	5,432,898
Land and improvements, gross	1,641,913
Buildings and improvements, gross	8,505,486
Land and improvements and buildings and improvements, gross	10,147,399
Accumulated Depreciation	$ 2,843,811
Rentable square feet (unaudited) \| ft²	16,292,164
Undeveloped land and construction in progress
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 0
Initial cost, land and improvements	787,640
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition/ Improvement	1,600,102
Land and improvements, gross	787,640
Buildings and improvements, gross	1,600,102
Land and improvements and buildings and improvements, gross	2,387,742
Accumulated Depreciation	$ 0
Rentable square feet (unaudited) \| ft²	0
Residential Tower \| Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings \| property	1

Schedule III - Real Estate and Accumulated Depreciation - Narrative (Details) $ in Thousands	Dec. 31, 2025 USD ($) property	Dec. 31, 2024 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Deferred financing costs, net	$ 9,150	$ 12,692
Investment in real estate, federal Income tax basis	10,600,000
Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	4,625,442
Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Deferred financing costs, net	7,757	8,489
3.57% Mortgage Payable due December 2026 \| Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	148,800
3.57% Mortgage Payable due December 2026 \| Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	148,815	152,668
4.48% Mortgage Payable due July 2027 \| Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	76,627	79,020
5.90% Mortgage Payable due August 2034 \| Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000
5.90% Mortgage Payable due August 2034 \| Kilroy Realty L.P. \| Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000	$ 375,000
Office Building
Real Estate and Accumulated Depreciation [Line Items]
Deferred financing costs, net	$ 7,800
Office Building \| Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings \| property	5
Residential Tower \| Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings \| property	1
Building
Real Estate and Accumulated Depreciation [Line Items]
Depreciation life	35 years
Tenant Improvements \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property depreciable lives	1 year
Tenant Improvements \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property depreciable lives	20 years

Schedule III - Real Estate and Accumulated Depreciation - Historical Cost Real Estate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Total real estate held for investment, beginning of year	$ 12,659,195	$ 12,241,648	$ 11,732,183
Acquisitions	338,678	21,941	0
Improvements, etc.	249,704	400,880	511,866
Total additions during period	588,382	422,821	511,866
Cost of real estate sold	(483,776)	0	0
Properties held for sale	221,693	0	0
Other	(6,967)	(5,274)	(2,401)
Total deductions during period	(712,436)	(5,274)	(2,401)
Total real estate held for investment, end of year	$ 12,535,141	$ 12,659,195	$ 12,241,648

Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Accumulated depreciation, beginning of year	$ 2,824,616	$ 2,518,304	$ 2,218,710
Depreciation of real estate	305,751	307,967	300,119
Total additions during period	305,751	307,967	300,119
Write-offs due to sale	(166,696)	0	0
Properties held for sale	(116,693)	0	0
Other	(3,167)	(1,655)	(525)
Total deductions during period	(286,556)	(1,655)	(525)
Accumulated depreciation, end of year	$ 2,843,811	$ 2,824,616	$ 2,518,304