PUBLIC STORAGE, 10-K filed on 2/24/2021
Annual Report
v3.20.4
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Transition Report false    
Entity File Number 001-33519    
Entity Registrant Name PUBLIC STORAGE    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 95-3551121    
Entity Address, Address Line One 701 Western Avenue    
Entity Address, City or Town Glendale    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91201-2349    
City Area Code 818    
Local Phone Number 244-8080    
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    
Entity Shell Company false    
Entity Public Float     $ 29,116,505,000
Entity Common Stock, Shares Outstanding   174,912,175  
Documents Incorporated by Reference Portions of the definitive proxy statement to be filed in connection with the Annual Meeting of Shareholders to be held in 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent described therein.    
Amendment Flag false    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001393311    
Common Shares [Member]      
Title of 12(b) Security Common Shares, $0.10 par value    
Trading Symbol PSA    
Security Exchange Name NYSE    
Series C Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.125% Cum Pref Share, Series C, $0.01 par value    
Trading Symbol PSAPrC    
Security Exchange Name NYSE    
Series D Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.950% Cum Pref Share, Series D, $0.01 par value    
Trading Symbol PSAPrD    
Security Exchange Name NYSE    
Series E Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.900% Cum Pref Share, Series E, $0.01 par value    
Trading Symbol PSAPrE    
Security Exchange Name NYSE    
Series F Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.150% Cum Pref Share, Series F, $0.01 par value    
Trading Symbol PSAPrF    
Security Exchange Name NYSE    
Series G Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.050% Cum Pref Share, Series G, $0.01 par value    
Trading Symbol PSAPrG    
Security Exchange Name NYSE    
Series H Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.600% Cum Pref Share, Series H, $0.01 par value    
Trading Symbol PSAPrH    
Security Exchange Name NYSE    
Series I Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.875% Cum Pref Share, Series I, $0.01 par value    
Trading Symbol PSAPrI    
Security Exchange Name NYSE    
Series J Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.700% Cum Pref Share, Series J, $0.01 par value    
Trading Symbol PSAPrJ    
Security Exchange Name NYSE    
Series K Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.750% Cum Pref Share, Series K, $0.01 par value    
Trading Symbol PSAPrK    
Security Exchange Name NYSE    
Series L Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.625% Cum Pref Share, Series L, $0.01 par value    
Trading Symbol PSAPrL    
Security Exchange Name NYSE    
Series M Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.125% Cum Pref Share, Series M, $0.01 par value    
Trading Symbol PSAPrM    
Security Exchange Name NYSE    
Series N Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 3.875% Cum Pref Share, Series N, $0.01 par value    
Trading Symbol PSAPrN    
Security Exchange Name NYSE    
Series O Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 3.900% Cum Pref Share, Series O, $0.01 par value    
Trading Symbol PSAPrO    
Security Exchange Name NYSE    
Notes Due 2032 [Member]      
Title of 12(b) Security 0.875% Senior Notes due 2032    
Trading Symbol PSA32    
Security Exchange Name NYSE    
v3.20.4
Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
ASSETS    
Cash and equivalents $ 257,560 $ 409,743
Real estate facilities, at cost:    
Land 4,375,588 4,186,873
Buildings 12,997,039 12,102,273
Real estate facilities, gross 17,372,627 16,289,146
Accumulated depreciation (7,152,135) (6,623,475)
Real estate facilities, net 10,220,492 9,665,671
Construction in process 188,079 141,934
Total real estate facilities 10,408,571 9,807,605
Investments in unconsolidated real estate entities 773,046 767,816
Goodwill and other intangible assets, net 204,654 205,936
Other assets 172,715 174,344
Total assets 11,816,546 11,365,444
LIABILITIES AND EQUITY    
Notes payable 2,544,992 1,902,493
Preferred shares called for redemption (Note 8) 300,000  
Accrued and other liabilities 394,655 383,284
Total liabilities 3,239,647 2,285,777
Commitments and contingencies (Note 13)
Public Storage shareholders' equity:    
Preferred Shares, $0.01 par value, 100,000,000 shares authorized, 151,700 shares issued (in series) and outstanding, (162,600 at December 31, 2019), at liquidation preference 3,792,500 4,065,000
Common Shares, $0.10 par value, 650,000,000 shares authorized,174,581,742 shares issued and outstanding (174,418,615 shares at December 31, 2019) 17,458 17,442
Paid-in capital 5,707,101 5,710,934
Accumulated deficit (914,791) (665,575)
Accumulated other comprehensive loss (43,401) (64,890)
Total Public Storage shareholders’ equity 8,558,867 9,062,911
Noncontrolling interests 18,032 16,756
Total equity 8,576,899 9,079,667
Total liabilities and equity $ 11,816,546 $ 11,365,444
v3.20.4
Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Balance Sheets [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 151,700 162,600
Preferred stock, shares outstanding 151,700 162,600
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 650,000,000 650,000,000
Common stock, shares issued 174,581,742 174,418,615
Common stock, shares outstanding 174,581,742 174,418,615
v3.20.4
Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:      
Revenues $ 2,915,068 $ 2,855,108 $ 2,759,523
Expenses:      
Self-storage cost of operations 807,543 762,416 709,739
Ancillary cost of operations 59,919 50,736 47,344
Depreciation and amortization 553,257 512,918 483,646
General and administrative 83,199 62,146 104,712
Interest expense 56,283 45,641 32,542
Operating expenses 1,560,201 1,433,857 1,377,983
Other increases (decreases) to net income:      
Interest and other income 22,323 26,683 24,552
Equity in earnings of unconsolidated real estate entities 80,497 69,547 103,495
Foreign currency exchange (loss) gain (97,953) 7,829 18,117
Gain on sale of real estate 1,493 341 37,903
Gain due to Shurgard public offering     151,616
Net income 1,361,227 1,525,651 1,717,223
Allocation to noncontrolling interests (4,014) (5,117) (6,192)
Net income allocable to Public Storage shareholders 1,357,213 1,520,534 1,711,031
Allocation of net income to:      
Preferred shareholders- distributions (207,068) (210,179) (216,316)
Preferred shareholders - redemptions (Note 8) (48,265) (32,693)
Restricted share units (3,545) (4,895) (5,815)
Net income allocable to common shareholders $ 1,098,335 $ 1,272,767 $ 1,488,900
Net income per common share:      
Basic $ 6.29 $ 7.30 $ 8.56
Diluted $ 6.29 $ 7.29 $ 8.54
Basic weighted average common shares outstanding 174,494 174,287 173,969
Diluted weighted average common shares outstanding 174,642 174,530 174,297
Self-Storage Operations [Member]      
Revenues:      
Revenues $ 2,721,630 $ 2,684,552 $ 2,597,607
Ancillary Operations [Member]      
Revenues:      
Revenues $ 193,438 $ 170,556 $ 161,916
v3.20.4
Statements Of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statements Of Comprehensive Income [Abstract]      
Net income $ 1,361,227 $ 1,525,651 $ 1,717,223
Adjust for foreign currency exchange loss reflected in gain on sale of real estate and gain on Shurgard public offering     27,207
Foreign currency exchange gain (loss) on investment in Shurgard 21,489 (830) (16,203)
Total comprehensive income 1,382,716 1,524,821 1,728,227
Allocation to noncontrolling interests (4,014) (5,117) (6,192)
Comprehensive income allocable to Public Storage shareholders $ 1,378,702 $ 1,519,704 $ 1,722,035
v3.20.4
Statements Of Equity - USD ($)
$ in Thousands
Cumulative Preferred Shares [Member]
Common Shares [Member]
Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Total Public Storage Shareholders' Equity [Member]
Noncontrolling Interests [Member]
Total
Balances at Dec. 31, 2017 $ 4,025,000 $ 17,385 $ 5,648,399 $ (675,711) $ (75,064) $ 8,940,009 $ 24,360 $ 8,964,369
Issuance of common shares in connection with share-based compensation (Note 10)   28 12,497     12,525   12,525
Share-based compensation expense, net of cash paid in lieu of common shares     (57,589)     (57,589)   (57,589)
Contributions by noncontrolling interests             1,720 1,720
Net income       1,717,223   1,717,223   1,717,223
Net income allocated to noncontrolling interests       (6,192)   (6,192) 6,192 (6,192)
Distributions to:                
Preferred shareholders (Note 8)       (216,316)   (216,316)   (216,316)
Noncontrolling interests             (7,022) (7,022)
Common shareholders and restricted share unitholders       (1,396,364)   (1,396,364)   (1,396,364)
Other comprehensive income (Note 2)         11,004 11,004   11,004
Balances at Dec. 31, 2018 4,025,000 17,413 5,718,485 (577,360) (64,060) 9,119,478 25,250 9,144,728
Issuance of preferred shares (Note 8) 1,090,000         1,059,156   1,059,156
Issuance of preferred shares (Note 8), adjustment to APIC     (30,844)          
Redemption of preferred shares (Note 8) (1,050,000)         (1,050,000)   (1,050,000)
Issuance of common shares in connection with share-based compensation (Note 10)   29 33,535     33,564   33,564
Share-based compensation expense, net of cash paid in lieu of common shares     13,671     13,671   13,671
Acquisition of noncontrolling interests     (23,913)     (23,913) (11,087) (35,000)
Contributions by noncontrolling interests             4,148 4,148
Net income       1,525,651   1,525,651   1,525,651
Net income allocated to noncontrolling interests       (5,117)   (5,117) 5,117 (5,117)
Distributions to:                
Preferred shareholders (Note 8)       (210,179)   (210,179)   (210,179)
Noncontrolling interests             (6,672) (6,672)
Common shareholders and restricted share unitholders       (1,398,570)   (1,398,570)   (1,398,570)
Other comprehensive income (Note 2)         (830) (830)   (830)
Balances at Dec. 31, 2019 4,065,000 17,442 5,710,934 (665,575) (64,890) 9,062,911 16,756 9,079,667
Issuance of preferred shares (Note 8) 1,247,500         1,208,206   1,208,206
Issuance of preferred shares (Note 8), adjustment to APIC     (39,294)          
Redemption of preferred shares (Note 8) (1,520,000)         (1,520,000)   (1,520,000)
Issuance of common shares in connection with share-based compensation (Note 10)   16 12,648     12,664   12,664
Share-based compensation expense, net of cash paid in lieu of common shares     (22,845)     (22,845)   (22,845)
Acquisition of noncontrolling interests     (32)     (32) (1) (33)
Contributions by noncontrolling interests             2,629 2,629
Net income       1,361,227   1,361,227   1,361,227
Net income allocated to noncontrolling interests       (4,014)   (4,014) 4,014 (4,014)
Distributions to:                
Preferred shareholders (Note 8)       (207,068)   (207,068)   (207,068)
Noncontrolling interests             (5,366) (5,366)
Common shareholders and restricted share unitholders       (1,399,361)   (1,399,361)   (1,399,361)
Other comprehensive income (Note 2)         21,489 21,489   21,489
Balances at Dec. 31, 2020 $ 3,792,500 $ 17,458 $ 5,707,101 $ (914,791) $ (43,401) $ 8,558,867 $ 18,032 $ 8,576,899
v3.20.4
Statements Of Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statements Of Equity [Abstract]    
Issuance of preferred shares, shares 49,900 43,600
Redemption of preferred shares, shares 60,800 42,000
Issuance of common shares in connection with share-based compensation, shares 163,127 287,734
Common shareholders and restricted share unitholders, per share distribution $ 8.00 $ 8.00
v3.20.4
Statements Of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 1,361,227 $ 1,525,651 $ 1,717,223
Adjustments to reconcile net income to net cash flows from operating activities:      
Gain due to Shurgard public offering     (151,616)
Gain on real estate investment sales (1,493) (341) (37,903)
Depreciation and amortization 553,257 512,918 483,646
Equity in earnings of unconsolidated real estate entities (80,497) (69,547) (103,495)
Distributions from cumulative equity in earnings of unconsolidated real estate entities 72,098 73,259 109,754
Foreign currency exchange loss (gain) 97,953 (7,829) (18,117)
Share-based compensation expense 33,363 25,833 69,936
Other 6,994 7,690 (5,782)
Total adjustments 681,675 541,983 346,423
Net cash flows from operating activities 2,042,902 2,067,634 2,063,646
Cash flows from investing activities:      
Capital expenditures to maintain real estate facilities (169,998) (187,303) (140,980)
Development and expansion of real estate facilities (189,413) (284,682) (340,032)
Acquisition of real estate facilities and intangible assets (792,266) (437,758) (181,020)
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities 24,658 11,630 91,927
Repayment of note receivable 7,509    
Proceeds from sale of real estate investments 1,796 762 54,184
Net cash flows used in investing activities (1,117,714) (897,351) (515,921)
Cash flows from financing activities:      
Repayments on notes payable (2,020) (1,920) (1,784)
Issuance of notes payable, net of issuance costs 545,151 496,900  
Issuance of preferred shares 1,208,206 1,059,156  
Issuance of common shares 12,664 33,564 12,525
Redemption of preferred shares (1,220,000) (1,050,000)  
Cash paid upon vesting of restricted share units (10,518) (12,162) (12,347)
Acquisition of noncontrolling interests (33) (35,000)  
Contributions by noncontrolling interests 2,629 4,148 1,720
Distributions paid to preferred shareholders, common shareholders and restricted share unitholders (1,606,429) (1,608,749) (1,612,680)
Distributions paid to noncontrolling interests (5,366) (6,672) (7,022)
Net cash flows used in financing activities (1,075,716) (1,120,735) (1,619,588)
Net cash flows (used in) from operating, investing, and financing activities (150,528) 49,548 (71,863)
Net effect of foreign exchange impact on cash and equivalents, including restricted cash (426) (13) (171)
(Decrease) increase in cash and equivalents, including restricted cash (150,954) 49,535 (72,034)
Cash and equivalents, including restricted cash at beginning of the period:      
Cash and equivalents 409,743 361,218 433,376
Restricted cash included in other assets 23,811 22,801 22,677
Cash, equivalents, and restricted cash 433,554 384,019 456,053
Cash and equivalents, including restricted cash at end of the period:      
Cash and equivalents 257,560 409,743 361,218
Restricted cash included in other assets 25,040 23,811 22,801
Cash, equivalents, and restricted cash 282,600 433,554 384,019
Costs incurred during the period remaining unpaid at period end for:      
Capital expenditures to maintain real estate facilities (10,359) (16,558) (11,422)
Construction or expansion of real estate facilities (32,349) (32,356) 81,157
Accrued and other liabilities 42,708 48,914 92,579
Real estate acquired in exchange for assumption of a liability (3,799) (1,817)  
Liability assumed in connection with acquisition of real estate 3,799    
Notes payable assumed in connection with acquisition of real estate   1,817  
Preferred shares called for redemption and reclassified to liabilities 300,000    
Preferred shares called for redemption and reclassified from equity (300,000)    
Foreign currency translation adjustment:      
Real estate facilities, net of accumulated depreciation     203
Investments in unconsolidated real estate entities (21,489) 830 15,997
Notes payable   (7,842) (18,285)
Accumulated other comprehensive gain $ 21,489 $ 6,999 $ 1,914
v3.20.4
Description Of The Business
12 Months Ended
Dec. 31, 2020
Description Of The Business [Abstract]  
Description Of The Business 1.Description of the Business

Public Storage (referred to herein as “the Company,” “we,” “us,” or “our”), a Maryland real estate investment trust (“REIT”), was organized in 1980. Our principal business activities include the ownership and operation of self-storage facilities which offer storage spaces for lease, generally on a month-to-month basis, for personal and business use, ancillary activities such as tenant reinsurance to the tenants at our self-storage facilities, merchandise sales and third party management, as well as the acquisition and development of additional self-storage space.

At December 31, 2020, we have direct and indirect equity interests in 2,548 self-storage facilities (with approximately 175.1 million net rentable square feet) located in 38 states in the United States (“U.S.”) operating under the “Public Storage” name, and 0.9 million net rentable square feet of commercial and retail space.

We own 31.3 million common shares (an approximate 35% interest) of Shurgard Self Storage SA (“Shurgard”), a public company traded on Euronext Brussels under the “SHUR” symbol, which owns 241 self-storage facilities (with approximately 13 million net rentable square feet) located in seven Western European countries, all operating under the “Shurgard” name. We also own an approximate 42% common equity interest in PS Business Parks, Inc. (“PSB”), a REIT traded on the New York Stock Exchange under the “PSB” symbol, which owns 27.7 million net rentable square feet of commercial properties, primarily multi-tenant industrial, flex, and office space, located in six states.

Disclosures of the number and square footage of facilities, as well as the number and coverage of tenant reinsurance policies (Note 13) are unaudited and outside the scope of our independent registered public accounting firm’s audit of our financial statements in accordance with the standards of the Public Company Accounting Oversight Board (U.S.).
v3.20.4
Summary Of Significant Accounting Policies
12 Months Ended
Dec. 31, 2020
Summary Of Significant Accounting Policies [Abstract]  
Summary Of Significant Accounting Policies 2.Summary of Significant Accounting Policies

Basis of Presentation

The financial statements are presented on an accrual basis in accordance with U.S. generally accepted accounting principles (“GAAP”) as defined in the Financial Accounting Standards Board Accounting Standards Codification (the “Codification”).

Certain amounts previously reported in our December 31, 2019 and 2018 financial statements have been reclassified to conform to the December 31, 2020 presentation, including revenues from our third party management activities of $8.3 million and $5.2 million for the years ended December 31, 2019 and 2018, respectively, previously reported within interest and other income; and cost of operations from our third party management activities of $6.5 million and $3.4 million for the years ended December 31, 2019 and 2018, respectively, previously reported within interest and other income. This reclassification had no impact on the our balance sheet, statements of comprehensive income, statements of equity, or cash flows as of and for the year ended December 31, 2019 and for the year ended 2018.

Additionally, we revised our prior period financial statements to correct the presentation of share-based compensation expense between general and administrative expense and self-storage cost of operations. As a result, we revised our statements of income for the years ended December 31, 2019 and 2018 with an increase in self-storage cost of operations of $9.8 million and $14.0 million, respectively, and a corresponding decrease to general and administrative expenses. This immaterial correction had no impact on our total expenses or net income. The correction also had no impact on our balance sheet, statements of comprehensive income, statements of equity, or cash flows as of and for the year ended December 31, 2019 and for the year ended 2018.

Consolidation and Equity Method of Accounting

We consider entities to be Variable Interest Entities (“VIEs”) when they have insufficient equity to finance their activities without additional subordinated financial support provided by other parties, or the equity holders as a group do not have a controlling financial interest. We consolidate VIEs when we have (i) the power to direct the activities most significantly impacting economic performance, and (ii) either the obligation to absorb losses or the right to receive benefits from the VIE. We have no involvement with any material VIEs. We consolidate all other entities when we control them through voting shares or contractual rights. The entities we consolidate, for the period in which the reference applies, are referred to collectively as the “Subsidiaries,” and we eliminate intercompany transactions and balances.

We account for our investments in entities that we do not consolidate but have significant influence over using the equity method of accounting. These entities, for the periods in which the reference applies, are referred to collectively as the “Unconsolidated Real Estate Entities,” eliminating intra-entity profits and losses and amortizing any differences between the cost of our investment and the underlying equity in net assets against equity in earnings as if the Unconsolidated Real Estate Entity were a consolidated subsidiary.

Equity in earnings of unconsolidated real estate entities presented on our income statements represents our pro-rata share of the earnings of the Unconsolidated Real Estate Entities. The dividends we receive from the Unconsolidated Real Estate Entities are reflected on our statements of cash flows as “distributions from cumulative equity in earnings of unconsolidated real estate entities” to the extent of our cumulative equity in earnings, with any excess classified as “distributions in excess of cumulative equity in earnings from unconsolidated real estate entities.”

When we begin consolidating an entity, we reflect our preexisting equity interest at book value. All changes in consolidation status are reflected prospectively.

Collectively, at December 31, 2020, the Company and the Subsidiaries own 2,548 self-storage facilities and four commercial facilities in the U.S. At December 31, 2020, the Unconsolidated Real Estate Entities are comprised of PSB and Shurgard.

Use of Estimates

The financial statements and accompanying notes reflect our estimates and assumptions. Actual results could differ from those estimates and assumptions.

Income Taxes

We have elected to be treated as a REIT, as defined in the Internal Revenue Code of 1986, as amended (the “Code”). For each taxable year in which we qualify for taxation as a REIT, we will not be subject to U.S. federal corporate income tax on our “REIT taxable income” (generally, taxable income subject to specified adjustments, including a deduction for dividends paid and excluding our net capital gain) that is distributed to our shareholders. We believe we have met these REIT requirements for all periods presented herein. Accordingly, we have recorded no U.S. federal corporate income tax expense related to our REIT taxable income.

Our tenant reinsurance, merchandise and third party management operations are subject to corporate income tax and such taxes are included in ancillary cost of operations. We also incur income and other taxes in certain states, which are included in general and administrative expense.

We recognize tax benefits of uncertain income tax positions that are subject to audit only if we believe it is more likely than not that the position would ultimately be sustained assuming the relevant taxing authorities

had full knowledge of the relevant facts and circumstances of our positions. As of December 31, 2020, we had no tax benefits that were not recognized.

Real Estate Facilities

Real estate facilities are recorded at cost. We capitalize all costs incurred to acquire, develop, construct, renovate and improve facilities, including interest and property taxes incurred during the construction period. We allocate the net acquisition cost of acquired real estate facilities to the underlying land, buildings, and identified intangible assets based upon their respective individual estimated fair values.

Costs associated with dispositions of real estate, as well as repairs and maintenance costs, are expensed as incurred. We depreciate buildings and improvements on a straight-line basis over estimated useful lives ranging generally between 5 to 25 years.

When we sell a full or partial interest in a real estate facility without retaining a controlling interest following sale, we recognize a gain or loss on sale as if 100% of the property was sold at fair value. If we retain a controlling interest following the sale, we record a noncontrolling interest for the book value of the partial interest sold, and recognize additional paid-in capital for the difference between the consideration received and the partial interest at book value.

Other Assets

Other assets primarily consist of rents receivable from our tenants (net of an allowance for uncollectible amounts), prepaid expenses, restricted cash and right-to-use assets. At December 31, 2019, other assets included notes receivable which were amortized on the effective interest method with book value of $4.4 million at the time they were repaid during 2020, at their respective $7.5 million contractual note balance. The $3.1 million excess proceeds were recorded as interest and other income in 2020.

Accrued and Other Liabilities

Accrued and other liabilities consist primarily of rents prepaid by our tenants, trade payables, property tax accruals, accrued payroll, accrued tenant reinsurance losses, lease liabilities, and contingent loss accruals when probable and estimable. We believe the fair value of our accrued and other liabilities approximates book value, due primarily to the short period until repayment. We disclose the nature of significant unaccrued losses that are reasonably possible of occurring and, if estimable, a range of exposure.

Cash Equivalents, Restricted Cash, Marketable Securities and Other Financial Instruments

Cash equivalents represent highly liquid financial instruments such as money market funds with daily liquidity or short-term commercial paper or treasury securities maturing within three months of acquisition. Cash and equivalents which are restricted from general corporate use are included in other assets. We believe that the book value of all such financial instruments for all periods presented approximates fair value, due to the short period to maturity.

Fair Value

As used herein, the term “fair value” is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Because our estimates of fair value involve considerable judgment, including determination of the factors that market participants would consider in negotiating exchange values, such estimates may be limited in their ability to reflect what would actually be realized in an actual market exchange.

We estimate the fair value of our cash and equivalents, marketable securities, other assets, debt, and other liabilities by discounting the related future cash flows at a rate based upon quoted interest rates for securities that have similar characteristics such as credit quality and time to maturity. Such quoted interest rates are referred to generally as “Level 2” inputs.

We use significant judgment to estimate fair values of investments in real estate, goodwill, and other intangible assets. In estimating their values, we consider significant unobservable inputs such as market prices of land, market capitalization rates, expected returns, earnings multiples, projected levels of earnings, costs of construction, and functional depreciation. These inputs are referred to generally as “Level 3” inputs.

Currency and Credit Risk

Financial instruments that are exposed to credit risk consist primarily of cash and equivalents, certain portions of other assets including rents receivable from our tenants (net of an allowance for uncollectible receivables based upon expected losses in the portfolio) and restricted cash. Cash equivalents we invest in are either money market funds with a rating of at least AAA by Standard & Poor’s, commercial paper that is rated A1 by Standard & Poor’s or deposits with highly rated commercial banks.

At December 31, 2020, due primarily to our investment in Shurgard (Note 4) and our notes payable denominated in Euros (Note 6), our operating results and financial position are affected by fluctuations in currency exchange rates between the Euro, and to a lesser extent, other European currencies, against the U.S. Dollar.

Goodwill and Other Intangible Assets

Intangible assets are comprised of goodwill, the “Shurgard” trade name, and finite-lived assets.

Goodwill totaled $174.6 million at December 31, 2020 and 2019. The “Shurgard” trade name, which is used by Shurgard pursuant to a fee-based licensing agreement, has a book value of $18.8 million at December 31, 2020 and 2019. Goodwill and the “Shurgard” trade name have indefinite lives and are not amortized.

Our finite-lived assets are comprised primarily of (i) acquired customers in place amortized relative to the benefit of the customers in place, with such amortization reflected as depreciation and amortization expense on our income statement and (ii) property tax abatements amortized relative to the reduction in property tax paid, with such amortization reflected as self-storage cost of operations on our income statement. At December 31, 2020, these intangibles had a net book value of $11.3 million ($12.5 million at December 31, 2019). Accumulated amortization totaled $27.3 million at December 31, 2020 ($27.5 million at December 31, 2019), and amortization expense of $16.1 million, $16.8 million and $16.6 million was recorded in 2020, 2019 and 2018, respectively.

The estimated future amortization expense for our finite-lived intangible assets at December 31, 2020 is approximately $11.9 million in 2021, $2.6 million in 2022 and $5.6 million thereafter. During 2020, 2019 and 2018, intangibles increased $14.9 million, $18.5 million and $11.6 million, respectively, in connection with the acquisition of self-storage facilities (Note 3).

Evaluation of Asset Impairment

We evaluate our real estate and finite-lived intangible assets for impairment each quarter. If there are indicators of impairment and we determine that the asset is not recoverable from future undiscounted cash flows to be received through the asset’s remaining life (or, if earlier, the expected disposal date), we record an impairment charge to the extent the carrying amount exceeds the asset’s estimated fair value or net proceeds from expected disposal.

We evaluate our investments in unconsolidated real estate entities for impairment on a quarterly basis. We record an impairment charge to the extent the carrying amount exceeds estimated fair value, when we believe any such shortfall is other than temporary.

We evaluate goodwill for impairment annually and whenever relevant events, circumstances and other related factors indicate that fair value of the related reporting unit may be less than the carrying amount. If we determine that the fair value of the reporting unit exceeds the aggregate carrying amount, no impairment charge is recorded. Otherwise, we record an impairment charge to the extent the carrying amount of the goodwill exceeds the amount that would be allocated to goodwill if the reporting unit were acquired for estimated fair value.

We evaluate other indefinite-lived intangible assets, such as the “Shurgard” trade name for impairment at least annually and whenever relevant events, circumstances and other related factors indicate that the fair value is less than the carrying amount. When we conclude that it is likely that the asset is not impaired, we do not record an impairment charge and no further analysis is performed. Otherwise, we record an impairment charge to the extent the carrying amount exceeds the asset’s estimated fair value.

No impairments were recorded in any of our evaluations for any period presented herein.

Revenue and Expense Recognition

Revenues from self-storage facilities, which are primarily composed of rental income earned pursuant to month-to-month leases, as well as associated late charges and administrative fees, are recognized as earned. Promotional discounts reduce rental income over the promotional period, which is generally one month. Ancillary revenues and interest and other income are recognized when earned.

We accrue for property tax expense based upon actual amounts billed and, in some circumstances, estimates when bills or assessments have not been received from the taxing authorities. If these estimates are incorrect, the timing and amount of expense recognition could be incorrect. Cost of operations (including advertising expenditures), general and administrative expense, and interest expense are expensed as incurred.

Foreign Currency Exchange Translation

The local currency (primarily the Euro) is the functional currency for our interests in foreign operations. The related balance sheet amounts are translated into U.S. Dollars at the exchange rates at the respective financial statement date, while amounts on our statements of income are translated at the average exchange rates during the respective period. When financial instruments denominated in a currency other than the U.S. Dollar are expected to be settled in cash in the foreseeable future, the impact of changes in the U.S. Dollar equivalent are reflected in current earnings. The Euro was translated at exchange rates of approximately 1.226 U.S. Dollars per Euro at December 31, 2020 (1.122 at December 31, 2019), and average exchange rates of 1.141, 1.120 and 1.181 for the years ended December 31, 2020, 2019 and 2018, respectively. Cumulative translation adjustments, to the extent not included in cumulative net income, are included in equity as a component of accumulated other comprehensive income (loss).

Comprehensive Income

Total comprehensive income represents net income, adjusted for changes in other comprehensive income (loss) for the applicable period, which are comprised primarily of foreign currency exchange gains and losses on our investment in Shurgard.

Recent Accounting Pronouncements and Guidance

In November 2018, the FASB issued ASU 2018- 19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses," which clarified that credit losses with respect to receivables arising from operating leases are to be evaluated within the scope of the leasing standard (ASU 2016-02), rather than within the scope of ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” We adopted this new standard on its effective date for us of January 1, 2020, which did not have a material impact on our consolidated financial statements.

Net Income per Common Share

Net income is allocated to (i) noncontrolling interests based upon their share of the net income of the Subsidiaries and (ii) preferred shareholders, to the extent redemption cost exceeds the related original net issuance proceeds (an “EITF D-42 allocation”), with the remaining net income allocated to each of our equity securities based upon the dividends declared or accumulated during the period, combined with participation rights in undistributed earnings.

Basic and diluted net income per common share are each calculated based upon net income allocable to common shareholders presented on the face of our income statement, divided by (i) in the case of basic net income per common share, weighted average common shares, and (ii) in the case of diluted income per share, weighted average common shares adjusted for the impact, if dilutive, of stock options outstanding (Note 10). The following table reconciles from basic to diluted common shares outstanding (amounts in thousands):

For the Years Ended

December 31,

2020

2019

2018

Weighted average common shares and equivalents

outstanding:

Basic weighted average common

shares outstanding

174,494

174,287

173,969

Net effect of dilutive stock options -

based on treasury stock method

148

243

328

Diluted weighted average common

shares outstanding

174,642

174,530

174,297

v3.20.4
Real Estate Facilities
12 Months Ended
Dec. 31, 2020
Real Estate Facilities [Abstract]  
Real Estate Facilities

3.Real Estate Facilities

Activity in real estate facilities during 2020, 2019 and 2018 is as follows:

For the Years Ended

2020

2019

2018

(Amounts in thousands)

Operating facilities, at cost:

Beginning balance

$

16,289,146

$

15,296,844

$

14,665,989

Capital expenditures to maintain real estate facilities

163,834

192,539

139,397

Acquisitions

781,219

421,097

169,436

Dispositions

(303)

(426)

(25,633)

Developed or expanded facilities opened for operation

138,731

379,092

348,270

Impact of foreign exchange rate changes

-

-

(615)

Ending balance

17,372,627

16,289,146

15,296,844

Accumulated depreciation:

Beginning balance

(6,623,475)

(6,140,072)

(5,700,331)

Depreciation expense

(528,660)

(483,408)

(457,029)

Dispositions

-

5

16,876

Impact of foreign exchange rate changes

-

-

412

Ending balance

(7,152,135)

(6,623,475)

(6,140,072)

Construction in process:

Beginning balance

141,934

285,339

264,441

Costs incurred to develop and expand real estate facilities

188,102

235,687

362,397

Write-off of cancelled projects

(3,226)

-

-

Developed or expanded facilities opened for operation

(138,731)

(379,092)

(348,270)

Dispositions

-

-

(2,698)

Transfer from other assets

-

-

9,469

Ending balance

188,079

141,934

285,339

Total real estate facilities at December 31,

$

10,408,571

$

9,807,605

$

9,442,111

During 2020, we acquired 62 self-storage facilities (5.1 million net rentable square feet of storage space), for a total cost of $792.3 million which includes the assumption of a $3.8 million liability. Approximately $14.9 million of the total cost was allocated to intangible assets. We completed development and redevelopment activities costing $138.7 million during 2020, adding 1.1 million net rentable square feet of self-storage space.

Included in general and administrative expense in 2020 is $3.2 million in development projects which were cancelled. Construction in process at December 31, 2020 consists of projects to develop new self-storage facilities and expand existing self-storage facilities.

During 2020, our accrual for unpaid construction costs decreased $1.3 million (a $49.0 million decrease for the same period in 2019). During 2020, our accrual for capital expenditures to maintain real estate facilities decreased $6.2 million (a $5.2 million increase for the same period in 2019).

During 2019, we acquired 44 self-storage facilities and one commercial facility (3.1 million net rentable square feet of storage space and 46,000 net rentable square feet of commercial space), for a total cost of $439.6 million, consisting of $437.8 million in cash and the assumption of $1.8 million in mortgage notes. Approximately $18.5 million of the total cost was allocated to intangible assets. We completed development and redevelopment activities costing $379.1 million during 2019, adding 3.7 million net rentable square feet of self-storage space.

During 2019, our accrual for unpaid construction costs decreased $49.0 million (a $22.4 million increase for the same period in 2018). During 2019, our accrual for capital expenditures to maintain real estate facilities increased $5.2 million (a $1.6 million decrease for the same period in 2018).

During 2018, we acquired 25 self-storage facilities (1.6 million net rentable square feet), for a total cost of $181.0 million in cash, of which $11.6 million was allocated to intangible assets. We completed development and redevelopment activities costing $348.3 million during 2018, adding 3.0 million net rentable square feet of self-storage space. Construction in process at December 31, 2018 consists of projects to develop new self-storage facilities and redevelop existing self-storage facilities. On October 18, 2018, we sold our property in West London to Shurgard for $42.1 million and recorded a related gain on sale of real estate of approximately $31.5 million. This gain was net of the recognition of a cumulative other comprehensive loss totaling $4.8 million with respect to foreign currency translation. On October 25, 2018, we sold a commercial facility for $8.7 million and recorded a related gain on sale of real estate of approximately $4.6 million. During 2018, we also sold portions of real estate facilities in connection with eminent domain proceedings for $3.4 million in cash proceeds and recorded a related gain on sale of real estate of approximately $1.8 million. During 2018, we also transferred $9.5 million of accumulated construction costs from other assets to construction in process.

At December 31, 2020, the adjusted basis of real estate facilities for U.S. federal tax purposes was approximately $11.2 billion (unaudited).
v3.20.4
Investments In Unconsolidated Real Estate Entities
12 Months Ended
Dec. 31, 2020
Investments In Unconsolidated Real Estate Entities [Abstract]  
Investments In Unconsolidated Real Estate Entities 4.Investments in Unconsolidated Real Estate Entities

The following table sets forth our investments in, and equity in earnings of, the Unconsolidated Real Estate Entities (amounts in thousands):

Investments in Unconsolidated Real Estate

Equity in Earnings of Unconsolidated Real Estate

Entities at December 31,

Entities for the Year Ended December 31,

2020

2019

2020

2019

2018

PSB

$

431,963

$

427,875

$

64,835

$

54,090

$

89,362

Shurgard

341,083

339,941

15,662

15,457

14,133

Total

$

773,046

$

767,816

$

80,497

$

69,547

$

103,495

Investment in PSB

Throughout all periods presented, we owned 7,158,354 shares of PSB’s common stock and 7,305,355 limited partnership units in an operating partnership controlled by PSB, representing an approximate 42% common equity interest. The limited partnership units are convertible at our option, subject to certain conditions, on a one-for-one basis into PSB common stock.

Based upon the closing price at December 31, 2020 ($132.87 per share of PSB common stock), the shares and units we owned had a market value of approximately $1.9 billion.

Our equity in earnings of PSB is comprised of our equity share of PSB’s net income, less amortization of the PSB Basis Differential (defined below).

During 2020, 2019, and 2018, we received cash distributions from PSB totaling $60.7 million, $60.7 million, and $55.0 million, respectively.

At December 31, 2020, our pro-rata investment in PSB’s real estate assets included in investment in unconsolidated real estate entities exceeds our pro-rata share of the underlying amounts on PSB’s balance sheet by approximately $3.4 million ($4.2 million at December 31, 2019). This differential (the “PSB Basis Differential”) is being amortized as a reduction to equity in earnings of the Unconsolidated Real Estate Entities. Such amortization totaled approximately $0.8 million, $3.2 million, and $1.8 million during 2020, 2019, and 2018, respectively.

PSB is a publicly held entity traded on the New York Stock Exchange under the symbol “PSB”.

Investment in Shurgard

Throughout all periods presented, we effectively owned, directly and indirectly, 31,268,459 Shurgard common shares. On October 15, 2018, Shurgard completed an initial global offering (the “Offering”), issuing 25.0 million of its common shares to third parties at a price of €23 per share, reducing our ownership interest to approximately 35%. Following the Offering, Shurgard’s shares began to trade on Euronext Brussels under the “SHUR” symbol. We recorded a “Gain due to Shurgard public offering” of $151.6 million, as if we had sold a proportionate share of our investment in Shurgard. The gain resulted in a $174.0 million increase in our investment in Shurgard and a $22.4 million reduction in other comprehensive loss with respect to cumulative foreign currency translation losses for Shurgard.

Based upon the closing price at December 31, 2020 (35.50 per share of Shurgard common stock, at 1.226 exchange rate of US Dollars to the Euro), the shares we owned had a market value of approximately $1.4 billion.

Our equity in earnings of Shurgard is comprised of our equity share of Shurgard’s net income, plus $1.1 million, $1.0 million, and $1.3 million for 2020, 2019 and 2018, respectively, representing our equity share

of the trademark license fees that Shurgard pays to us for the use of the “Shurgard” trademark. We classify the remaining license fees we receive from Shurgard as interest and other income on our income statement.

The dividends we receive from Shurgard, combined with our equity share of trademark license fees collected from Shurgard, are reflected on our statements of cash flows as “distributions from cumulative equity in earnings of unconsolidated real estate entities” to the extent of our cumulative earnings, with any excess classified as “distributions in excess of cumulative equity in earnings from unconsolidated real estate entities.” During 2020 and 2019, Shurgard paid 0.99 and €0.67, respectively, per share in dividends to its shareholders, of which our share totaled $34.9 million and $23.1 million, respectively. During 2018, Shurgard paid a cash dividend to its shareholders at the time, of which our equity share was $145.4 million.

Changes in foreign currency exchange rates increased our investment in Shurgard by approximately $21.5 million in 2020 and decreased our investment in Shurgard by approximately $0.8 million and $16.0 million in 2019 and 2018, respectively.

Shurgard is a publicly held entity trading on Euronext Brussels under the symbol “SHUR”.
v3.20.4
Credit Facility
12 Months Ended
Dec. 31, 2020
Credit Facility [Abstract]  
Credit Facility 5.Credit Facility

We have a revolving credit agreement (the “Credit Facility”) with a $500 million borrowing limit, which matures on April 19, 2024. Amounts drawn on the Credit Facility bear annual interest at rates ranging from LIBOR plus 0.7% to LIBOR plus 1.350% depending upon the ratio of our Total Indebtedness to Gross Asset Value (as defined in the Credit Facility) (LIBOR plus 0.7% at December 31, 2020). We are also required to pay a quarterly facility fee ranging from 0.07% per annum to 0.25% per annum depending upon the ratio of our Total Indebtedness to our Gross Asset Value (0.07% per annum at December 31, 2020). At December 31, 2020 and February 24, 2021, we had no outstanding borrowings under this Credit Facility. We had undrawn standby letters of credit, which reduce our borrowing capacity, totaling $24.3 million at December 31, 2020 ($15.9 million at December 31, 2019). The Credit Facility has various customary restrictive covenants, all of which we were in compliance with at December 31, 2020.

v3.20.4
Notes Payable
12 Months Ended
Dec. 31, 2020
Notes Payable [Abstract]  
Notes Payable 6.Notes Payable

Our notes payable are reflected net of issuance costs (including original issue discounts), which are amortized as interest expense on the effective interest method over the term of each respective note. Our notes payable at December 31, 2020 and 2019 are set forth in the tables below:

Amounts at December 31, 2020

Coupon

Effective

Unamortized

Book

Fair

Rate

Rate

Principal

Costs

Value

Value

($ amounts in thousands)

U.S. Dollar Denominated Unsecured Debt

Notes due September 15, 2022

2.370%

2.483%

$

500,000 

$

(891)

$

499,109 

$

517,419 

Notes due September 15, 2027

3.094%

3.218%

500,000 

(3,548)

496,452 

560,833 

Notes due May 1, 2029

3.385%

3.459%

500,000 

(2,567)

497,433 

574,833 

1,500,000 

(7,006)

1,492,994 

1,653,085 

Euro Denominated Unsecured Debt

Notes due April 12, 2024

1.540%

1.540%

122,646 

-

122,646 

129,192 

Notes due November 3, 2025

2.175%

2.175%

296,821 

-

296,821 

323,552 

Notes due January 24, 2032

0.875%

0.978%

613,232 

(5,931)

607,301 

634,389 

1,032,699 

(5,931)

1,026,768 

1,087,133 

Mortgage Debt, secured by 27

real estate facilities with a net

book value of $102.1 million

3.962%

3.947%

25,230 

-

25,230 

26,958 

$

2,557,929 

$

(12,937)

$

2,544,992 

$

2,767,176 

Amounts at

December 31, 2019

Book

Fair

Value

Value

($ amounts in thousands)

U.S. Dollar Denominated Unsecured Debt

Notes due September 15, 2022

$

498,581 

$

505,639 

Notes due September 15, 2027

495,924 

520,694 

Notes due May 1, 2029

497,124 

531,911 

1,491,629 

1,558,244 

Euro Denominated Unsecured Debt

Notes due April 12, 2024

112,156 

115,932 

Notes due November 3, 2025

271,433 

298,398 

Notes due January 24, 2032

-

-

383,589 

414,330 

Mortgage Debt

27,275 

28,506 

$

1,902,493 

$

2,001,080 

U.S. Dollar Denominated Unsecured Notes

On April 12, 2019, we completed a public offering of $500 million in aggregate principal amount of senior notes bearing interest at an annual rate of 3.385% maturing on May 1, 2029. In connection with the offering, we incurred a total of $3.1 million in costs. The notes issued on April 12, 2019 along with notes previously issued in 2017 are referred to hereinafter as the “U.S. Dollar Denominated Notes.”

The U.S. Dollar Denominated Notes have various financial covenants, all of which we were in compliance with at December 31, 2020. Included in these covenants are (a) a maximum Debt to Total Assets of 65% (approximately 8% at December 31, 2020) and (b) a minimum ratio of Adjusted EBITDA to Interest Expense of 1.5x (approximately 38x for the twelve months ended December 31, 2020) as well as covenants limiting the amount we can encumber our properties with mortgage debt.

Euro Denominated Unsecured Notes

Our Euro denominated unsecured notes (the “Euro Notes”) consist of three tranches, (i) €242.0 million issued to institutional investors on November 3, 2015 for $264.3 million in net proceeds upon converting the Euros to U.S. Dollars, (ii) €100.0 million issued to institutional investors on April 12, 2016 for $113.6 million in net proceeds upon converting the Euros to U.S. Dollars and (iii) €500.0 million issued in a public offering on January 24, 2020 for $545.2 million in net proceeds upon converting the Euros to U.S. Dollars. Interest is payable semi-annually on the notes issued November 3, 2015 and April 12, 2016, and annually on the notes issued January 24, 2020. The Euro Notes have financial covenants similar to those of the U.S. Dollar Notes.

We reflect changes in the U.S. Dollar equivalent of the amount payable, as a result of changes in foreign exchange rates as “foreign currency exchange (loss) gain” on our income statement (a loss of $98.0 million for 2020, as compared to gains of $7.8 million and $18.1 million for 2019 and 2018, respectively).

Mortgage Notes

Our non-recourse mortgage debt was assumed in connection with property acquisitions, and recorded at fair value with any premium or discount to the stated note balance amortized using the effective interest method.

During 2019, we assumed a mortgage note with a contractual value of $1.8 million and an interest rate of 3.9%, which approximated market rate, in connection with the acquisition of a real estate facility.

At December 31, 2020, the related contractual interest rates are fixed, ranging between 3.2% and 7.1%, and mature between January 1, 2022 and July 1, 2030.

At December 31, 2020, approximate principal maturities of our Notes Payable are as follows (amounts in thousands):

Unsecured

Mortgage

Debt

Debt

Total

2021

$

-

$

1,851

$

1,851

2022

500,000

2,574

502,574

2023

-

19,219

19,219

2024

122,646

124

122,770

2025

296,821

131

296,952

Thereafter

1,613,232

1,331

1,614,563

$

2,532,699

$

25,230

$

2,557,929

Weighted average effective rate

2.4%

3.9%

2.4%

Cash paid for interest totaled $52.7 million, $48.3 million and $36.3 million for 2020, 2019 and 2018, respectively. Interest capitalized as real estate totaled $3.4 million, $3.9 million and $4.8 million for 2020, 2019 and 2018, respectively.
v3.20.4
Noncontrolling Interests
12 Months Ended
Dec. 31, 2020
Noncontrolling Interests [Abstract]  
Noncontrolling Interests 7.Noncontrolling Interests

At December 31, 2020, the noncontrolling interests represent (i) third-party equity interests in subsidiaries owning 21 operating self-storage facilities and five self-storage facilities that are under construction and (ii) 231,978 partnership units held by third-parties in a subsidiary that are convertible on a one-for-one basis (subject to certain limitations) into common shares of the Company at the option of the unitholder (collectively, the “Noncontrolling Interests”). At December 31, 2020, the Noncontrolling Interests cannot require us to redeem their interests, other than pursuant to a liquidation of the subsidiary.

During 2020, 2019 and 2018, we allocated a total of $4.0 million, $5.1 million and $6.2 million, respectively, of income to these interests; and we paid $5.4 million, $6.7 million and $7.0 million, respectively, in distributions to these interests.

During 2019, we acquired noncontrolling interests for an aggregate of $35.0 million in cash, of which $11.1 million was allocated to Noncontrolling Interests, with the remainder allocated to Paid-in Capital. During 2020, 2019 and 2018, Noncontrolling Interests contributed $2.6 million, $4.1 million and $1.7 million, respectively, to our subsidiaries.
v3.20.4
Shareholders' Equity
12 Months Ended
Dec. 31, 2020
Shareholders’ Equity [Abstract]  
Shareholders' Equity 8.Shareholders’ Equity

Preferred Shares

At December 31, 2020 and 2019, we had the following series of Cumulative Preferred Shares (“Preferred Shares”) outstanding:

At December 31, 2020

At December 31, 2019

Series

Earliest Redemption Date

Dividend Rate

Shares Outstanding

Liquidation Preference

Shares Outstanding

Liquidation Preference

(Dollar amounts in thousands)

Series V

9/20/2017

5.375%

-

$

-

19,800

$

495,000

Series W

1/16/2018

5.200%

-

-

20,000

500,000

Series X

3/13/2018

5.200%

-

-

9,000

225,000

Series B

1/20/2021

5.400%

-

-

12,000

300,000

Series C

5/17/2021

5.125%

8,000

200,000

8,000

200,000

Series D

7/20/2021

4.950%

13,000

325,000

13,000

325,000

Series E

10/14/2021

4.900%

14,000

350,000

14,000

350,000

Series F

6/2/2022

5.150%

11,200

280,000

11,200

280,000

Series G

8/9/2022

5.050%

12,000

300,000

12,000

300,000

Series H

3/11/2024

5.600%

11,400

285,000

11,400

285,000

Series I

9/12/2024

4.875%

12,650

316,250

12,650

316,250

Series J

11/15/2024

4.700%

10,350

258,750

10,350

258,750

Series K

12/20/2024

4.750%

9,200

230,000

9,200

230,000

Series L

6/17/2025

4.625%

22,600

565,000

-

-

Series M

8/14/2025

4.125%

9,200

230,000

-

-

Series N

10/6/2025

3.875%

11,300

282,500

-

-

Series O

11/17/2025

3.900%

6,800

170,000

-

-

Total Preferred Shares

151,700

$

3,792,500

162,600

$

4,065,000

The holders of our Preferred Shares have general preference rights with respect to liquidation, quarterly distributions and any accumulated unpaid distributions. Except as noted below, holders of the Preferred Shares do not have voting rights. In the event of a cumulative arrearage equal to six quarterly dividends, holders of all outstanding series of preferred shares (voting as a single class without regard to series) will have the right to elect two additional members to serve on our Board of Trustees (our “Board”) until the arrearage has been cured. At December 31, 2020, there were no dividends in arrears. The affirmative vote of at least 66.67% of the outstanding shares of a series of Preferred Shares is required for any material and adverse amendment to the terms of such series. The affirmative vote of at least 66.67% of the outstanding shares of all of our Preferred Shares, voting as a single class, is required to issue shares ranking senior to our Preferred Shares.

Except under certain conditions relating to the Company’s qualification as a REIT, the Preferred Shares are not redeemable prior to the dates indicated on the table above. On or after the respective dates, each of the series of Preferred Shares is redeemable at our option, in whole or in part, at $25.00 per depositary share, plus accrued and unpaid dividends. Holders of the Preferred Shares cannot require us to redeem such shares.

Upon issuance of our Preferred Shares, we classify the liquidation value as preferred equity on our balance sheet with any issuance costs recorded as a reduction to Paid-in capital.

In 2020, we redeemed our Series V, Series W and Series X Preferred Shares, at par, for a total of $1.22 billion in cash, before payment of accrued dividends.

On December 14, 2020, we called for redemption of, and on January 20, 2021, we redeemed our 5.40% Series B Preferred Shares, at par. The liquidation value (at par) of $300.0 million was reclassified as a liability at December 31, 2020. We recorded a $9.9 million allocation of income from our common shareholders to the holders of our Preferred Shares in 2020 in connection with this redemption.

In 2020, we issued an aggregate 49.9 million depositary shares, each representing 0.001 of a share of our Series L, Series M, Series N and Series O Preferred Shares, at an issuance price of $25.00 per depositary share, for a total of $1.25 billion in gross proceeds, and we incurred $39.3 million in issuance costs.

In 2019, we redeemed our Series U, Series Y, Series Z and Series A Preferred Shares, at par, for a total of $1.05 billion in cash, before payment of accrued dividends.

In 2019, we issued an aggregate 43.6 million depositary shares, each representing 0.001 of a share of our Series H, Series I, Series J and Series K Preferred Shares, at an issuance price of $25.00 per depositary share, for a total of $1.09 billion in gross proceeds, and we incurred $30.8 million in issuance costs.

In 2020 and 2019, we recorded $48.3 million and $32.7 million, respectively, in EITF D-42 allocations of income from our common shareholders to the holders of our Preferred Shares in connection with redemptions of Preferred Shares, including the redemption of our Series B Preferred Shares as noted above.

Common Shares

During 2020, 2019 and 2018, activity with respect to the issuance of our common shares was as follows (dollar amounts in thousands):

2020

2019

2018

Shares

Amount

Shares

Amount

Shares

Amount

Employee stock-based compensation and

exercise of stock options (Note 10)

163,127 

$

12,664 

287,734 

$

33,564 

277,511 

$

12,525 

Our Board previously authorized the repurchase from time to time of up to 35.0 million of our common shares on the open market or in privately negotiated transactions. Through December 31, 2020, we repurchased approximately 23.7 million shares pursuant to this authorization; none of which were repurchased during the three years ended December 31, 2020.

At December 31, 2020 and 2019, we had 3,513,955 and 2,958,817, respectively, of common shares reserved in connection with our share-based incentive plans (see Note 10), and 231,978 shares reserved for the conversion of partnership units owned by Noncontrolling Interests.

The unaudited characterization of dividends for U.S. federal corporate income tax purposes is made based upon earnings and profits of the Company, as defined by the Code. Common share dividends including amounts paid to our restricted share unitholders totaled $1.399 billion ($8.00 per share), $1.399 billion ($8.00 per share) and $1.396 billion ($8.00 per share) for the years ended December 31, 2020, 2019 and 2018, respectively. Preferred share dividends totaled $207.1 million, $210.2 million and $216.3 million for the years ended December 31, 2020, 2019 and 2018, respectively.

For the tax year ended December 31, 2020, distributions for the common shares and all the various series of preferred shares were classified as follows:

2020 (unaudited)

1st Quarter

2nd Quarter

3rd Quarter

4th Quarter

Ordinary Income

100.00

%

100.00

%

100.00

%

100.00

%

Long-Term Capital Gain

0.00

%

0.00

%

0.00

%

0.00

%

Total

100.00

%

100.00

%

100.00

%

100.00

%

The ordinary income dividends distributed for the tax year ended December 31, 2020 are not qualified dividends under the Internal Revenue Code, however, they are subject to the 20% deduction under IRS Section 199A.
v3.20.4
Related Party Transactions
12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Related Party Transactions 9.Related Party Transactions

B. Wayne Hughes, our former Chairman and his family, including his daughter Tamara Hughes Gustavson, a current member of the Board, and his son B. Wayne Hughes, Jr., a former member of the Board who retired effective December 31, 2020, collectively own approximately 13.0% of our common shares outstanding at December 31, 2020.

At December 31, 2020, Tamara Hughes Gustavson and her adult children owned and controlled 64 self-storage facilities in Canada.  Ms. Gustavson’s direct ownership in these properties is less than 1.0%. These facilities operate under the “Public Storage” tradename, which we license to the owners of these facilities for use in Canada on a royalty-free, non-exclusive basis. We have no ownership interest in these facilities and we do not own or operate any facilities in Canada.  If we chose to acquire or develop our own facilities in Canada, we would have to share the use of the “Public Storage” name in Canada. We have a right of first refusal, subject to limitations, to acquire the stock or assets of the corporation engaged in the operation of these facilities if their owners agree to sell them. Our subsidiaries reinsure risks relating to loss of goods stored by customers in these facilities, and have received approximately $1.6 million, $1.5 million and $1.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Our right to continue receiving these premiums may be qualified.  
v3.20.4
Share-Based Compensation
12 Months Ended
Dec. 31, 2020
Share-Based Compensation [Abstract]  
Share-Based Compensation 10.Share-Based Compensation

Under various share-based compensation plans and under terms established or modified by our Board or a committee thereof, we grant non-qualified options to purchase the Company’s common shares, as well as restricted share units (“RSUs”), to trustees, officers, and key employees.

Stock options and RSUs are considered “granted” and “outstanding” as the terms are used herein, when (i) the Company and the recipient reach a mutual understanding of the key terms of the award, (ii) the award has been authorized, and (iii) the recipient is affected by changes in the market price of our stock.

We amortize the grant-date fair value of awards, including grants to nonemployee service providers, as compensation expense over the service period, which begins on the grant date and ends on the expected vesting date. For awards that are earned solely upon the passage of time and continued service, the entire cost of the award is amortized on a straight-line basis over the service period. For awards with performance conditions, the individual cost of each vesting is amortized separately over each individual service period (the “accelerated attribution” method).

Modifications to the terms of awards that were probable of vesting before the modification (“Type I Modifications”) are recorded prospectively, with remaining unamortized grant-date fair value at the time of modification amortized over the remaining service period. Modifications of awards which were considered improbable of vesting before the modification (“Type III Modifications”) are accounted for as a cancellation of the original award and a new grant under the revised terms.

In July 2020, our share-based compensation plans were modified to allow immediate vesting upon retirement (“Retirement Acceleration”), and to extend the exercisability of outstanding stock options up to a year after retirement, for currently outstanding and future grants. Prior to the modification, unvested awards were forfeited, and outstanding vested stock options were cancelled, upon retirement. Employees are eligible for Retirement Acceleration if they meet certain conditions including length of service, age, notice of intent to retire, and facilitation of succession for their role.

This modification results in accelerating amortization of compensation expense for each grant by changing the end of the service period from the original vesting date to the date an employee is expected to be eligible for Retirement Acceleration, if earlier. As a result, the Company recorded $5.7 million in accelerated compensation expense during 2020, with such amounts included in the amounts disclosed below under “Stock Options” and “Restricted Share Units.”

The Codification previously stipulated that grants to nonemployee service providers (other than to trustees, where equity method treatment was permitted) were accounted for on the liability method, with expenses adjusted each period based upon changes in fair value. Recent changes in the Codification allows such grants to be accounted for on the equity award method, with compensation expense based upon grant date fair value. While we have no such grants to any such individuals for any periods presented, we will account for any future grants to nonemployee service providers based upon the equity award method.

In amortizing share-based compensation expense, we do not estimate future forfeitures in advance. Instead, we reverse previously amortized share-based compensation expense with respect to grants that are forfeited in the period the employee terminates employment.

In February 2018, we announced that our Chief Executive Officer and Chief Financial Officer at the time were retiring from their executive roles at the end of 2018 and would then serve only as Trustees of the Company. Pursuant to our share-based compensation plans, their unvested grants will continue to vest over the original vesting periods during their service as Trustees. For financial reporting, the end of the service periods for previous stock option and RSU grants for these executives changed from (i) the various vesting dates to (ii) December 31, 2018 when they retired. Accordingly, all remaining share-based compensation expense for these two executives was amortized in the year ended December 31, 2018.

See also “net income per common share” in Note 2 for further discussion regarding the impact of RSUs and stock options on our net income per common share and income allocated to common shareholders.

Stock Options

Stock options vest over 3 to 5 years, expire 10 years after the grant date, and the exercise price is equal to the closing trading price of our common shares on the grant date. Employees cannot require the Company to settle their award in cash. We use the Black-Scholes option valuation model to estimate the fair value of our stock options.

Outstanding stock option grants are included on a one-for-one basis in our diluted weighted average shares, to the extent dilutive, after applying the treasury stock method (based upon the average common share price during the period) to assumed exercise proceeds and measured but unrecognized compensation.

During 2020, 770,000 stock options were granted where vesting is dependent upon meeting certain performance targets with respect to 2020, 2021, and 2022. As of December 31, 2020, these targets are expected to be met at 100% achievement. These options are included in the grants during 2020 and in options outstanding at December 31, 2020, and $3.0 million in related compensation expense was recorded during 2020.

The stock options outstanding at December 31, 2020 have an aggregate intrinsic value (the excess, if any, of each option’s market value over the exercise price) of approximately $63.2 million and remaining average contractual lives of approximately six years. The aggregate intrinsic value of exercisable stock options at December 31, 2020 amounted to approximately $52.3 million. Approximately 1,240,000 of the stock options outstanding at December 31, 2020, have an exercise price of more than $225. Included in our stock options exercisable at December 31, 2020, are 16,667 stock options which expire through June 30, 2021, with an average exercise price per share of $115.96.

Additional information with respect to stock options during 2020, 2019 and 2018 is as follows:

2020

2019

2018

Weighted

Weighted

Weighted

Average

Average

Average

Number

Exercise

Number

Exercise

Number

Exercise

of

Price

of

Price

of

Price

Options

per Share

Options

per Share

Options

per Share

Options outstanding January 1,

2,339,667 

$

204.53 

2,420,922 

$

201.31 

2,408,917 

$

192.12 

Granted

840,000 

226.58 

120,000 

221.12 

200,000 

194.29 

Exercised

(71,500)

175.16 

(191,255)

174.55 

(179,995)

69.53 

Cancelled

(147,000)

222.67 

(10,000)

197.90 

(8,000)

223.50 

Options outstanding December 31,

2,961,167 

$

210.59 

2,339,667 

$

204.53 

2,420,922 

$

201.31 

Options exercisable at December 31,

1,585,091 

$

199.54 

1,501,667 

$

196.37 

1,147,122 

$

178.31 

2020

2019

2018

Stock option expense for the year (in 000's) (a)

$

7,613 

$

4,950 

$

17,162 

Aggregate exercise date intrinsic value of options exercised during the year (in 000's)

$

3,433 

$

11,848 

$

25,117 

Average assumptions used in valuing options with the Black-Scholes method:

Expected life of options in years, based upon historical experience

5 

5 

5 

Risk-free interest rate

0.43%

2.3%

2.7%

Expected volatility, based upon historical volatility

21.6%

8.9%

12.5%

Expected dividend yield

3.8%

3.6%

4.1%

Average estimated value of options granted during the year

$

17.79 

$

9.61 

$

13.09 

(a) Amounts for 2020 include $0.3 million in connection with the Retirement Acceleration. Amounts for 2018 include $8.1 million, in connection with the acceleration of amortization on grants discussed above. Of the total expense recorded, $2.8 million, $2.2 million and $2.1 million for 2020, 2019 and 2018,

respectively, was allocated to cost of operations, with the remainder allocated to general and administrative expense.

Restricted Share Units

RSUs generally vest over 5 to 8 years from the grant date. The grantee receives dividends for each outstanding RSU equal to the per-share dividends received by our common shareholders. We expense any dividends previously paid upon forfeiture of the related RSU. Upon vesting, the grantee receives common shares equal to the number of vested RSUs, less common shares withheld in exchange for tax deposits made by the Company to satisfy the grantee’s statutory tax liabilities arising from the vesting.

The fair value of our RSUs is determined based upon the applicable closing trading price of our common shares.

The fair value of our RSUs outstanding at December 31, 2020 was approximately $127.7 million. Remaining compensation expense related to RSUs outstanding at December 31, 2020 totals approximately $76.9 million and is expected to be recognized as compensation expense over the next 4 years on average. The following tables set forth relevant information with respect to restricted shares (dollar amounts in thousands):

2020

2019

2018

Number of

Grant Date

Number of

Grant Date

Number of

Grant Date

Restricted

Aggregate

Restricted

Aggregate

Restricted

Aggregate

Share Units

Fair Value

Share Units

Fair Value

Share Units

Fair Value

Restricted share units outstanding January 1,

619,150 

$

132,058 

717,696 

$

151,212 

799,129 

$

166,144 

Granted

110,755 

24,617 

97,140 

21,113 

138,567 

27,733 

Vested

(140,089)

(28,141)

(160,329)

(32,714)

(164,104)

(30,717)

Forfeited

(37,028)

(7,964)

(35,357)

(7,553)

(55,896)

(11,948)

Restricted share units outstanding December 31,

552,788 

$

120,570 

619,150 

$

132,058 

717,696 

$

151,212 

2020

2019

2018

Amounts for the year (in 000's, except number of shares):

Fair value of vested shares on vesting date

$

31,076 

$

33,769 

$

32,317 

Cash paid for taxes upon vesting in lieu of issuing common shares

$

10,518 

$

12,162 

$

12,347 

Common shares issued upon vesting

91,627 

96,479 

97,516 

Restricted share unit expense (a)

$

26,359 

$

21,662 

$

53,869 

(a)Amounts for 2020, 2019 and 2018 include approximately $1.3 million, $1.2 million and $1.1 million, respectively, in employer taxes incurred upon vesting. Amounts for 2020 include $5.4 million, in connection with the Retirement Acceleration as discussed above. Amounts for 2018 include $22.6 million, in connection with the acceleration of amortization on grants to our CEO and CFO as discussed above. Of the total expense recorded, $12.1 million, $9.9 million and $14.3 million for 2020, 2019 and 2018, respectively, was allocated to cost of operations, with the remainder allocated to general and administrative expense.
v3.20.4
Segment Information
12 Months Ended
Dec. 31, 2020
Segment Information [Abstract]  
Segment Information 11.Segment Information

Our reportable segments reflect the significant components of our operations where discrete financial information is evaluated separately by our chief operating decision maker (“CODM”). We organize our segments

based primarily upon the nature of the underlying products and services, as well as the drivers of profitability growth. The net income for each reportable segment included in the table below are in conformity with GAAP and our significant accounting policies as denoted in Note 2. The amounts not attributable to reportable segments are aggregated under “other items not allocated to segments.”

Following is a description of and basis for presentation for each of our reportable segments.

Self-Storage Operations

The Self-Storage Operations segment reflects the rental operations from all self-storage facilities we own. Our CODM reviews the net operating income (“NOI”) of this segment, which represents the related revenues less cost of operations (prior to depreciation expense), in assessing performance and making resource allocation decisions. The presentation in the tables below sets forth the NOI of this segment, as well as the depreciation expense for this segment, which while reviewed by our CODM and included in net income, is not considered by the CODM in assessing performance and decision making. For all periods presented, substantially all of our real estate facilities, goodwill and other intangible assets, other assets, and accrued and other liabilities are associated with the Self-Storage Operations segment.

Ancillary Operations

The Ancillary Operations segment reflects the operations of our tenant reinsurance, merchandise sales and third party management activities.

Investment in PSB

This segment represents our approximate 42% equity interest in PSB, a publicly-traded REIT that owns, operates, acquires and develops commercial properties, primarily multi-tenant flex, office, and industrial space. PSB has a separate management team and board of directors that makes its financing, capital allocation, and other significant decisions. In making resource allocation decisions with respect to our investment in PSB, the CODM reviews PSB’s net income, which is detailed in PSB’s periodic filings with the SEC. The segment presentation in the tables below includes our equity earnings from PSB.

Investment in Shurgard

This segment represents our approximate 35% equity interest in Shurgard, a publicly held company which owns and operates self-storage facilities located in seven countries in Western Europe. Shurgard has a separate management team and board of trustees that makes its financing, capital allocation, and other significant decisions. In making resource allocation decisions with respect to our investment in Shurgard, the CODM reviews Shurgard’s net income. The segment presentation below includes our equity earnings from Shurgard.

Presentation of Segment Information

The following tables reconcile NOI (as applicable) and net income of each segment to our consolidated net income (amounts in thousands):

For the Years Ended December 31,

2020

2019

2018

Self-Storage Segment

Revenue

$

2,721,630 

$

2,684,552 

$

2,597,607 

Cost of operations

(807,543)

(762,416)

(709,739)

Net operating income

1,914,087 

1,922,136 

1,887,868 

Depreciation and amortization

(553,257)

(512,918)

(483,646)

Net income

1,360,830 

1,409,218 

1,404,222 

Ancillary Segment

Revenue

193,438 

170,556 

161,916 

Cost of operations

(59,919)

(50,736)

(47,344)

Net operating income

133,519 

119,820 

114,572 

Investment in PSB Segment (a) - Equity in earnings of unconsolidated entities

64,835 

54,090 

89,362 

Investment in Shurgard Segment (a) - Equity in earnings of unconsolidated entities

15,662 

15,457 

14,133 

Gain due to Shurgard public offering

-

-

151,616 

Net income from Investment in Shurgard Segment

15,662 

15,457 

165,749 

Total net income allocated to segments

1,574,846 

1,598,585 

1,773,905 

Other items not allocated to segments:

General and administrative

(83,199)

(62,146)

(104,712)

Interest and other income

22,323 

26,683 

24,552 

Interest expense

(56,283)

(45,641)

(32,542)

Foreign currency exchange (loss) gain

(97,953)

7,829 

18,117 

Gain on sale of real estate

1,493 

341 

37,903 

Net income

$

1,361,227 

$

1,525,651 

$

1,717,223 

(a)See Note 4 for a reconciliation of these amounts to our total Equity in Earnings of Unconsolidated Real Estate Entities on our income statements.
v3.20.4
Recent Accounting Pronouncements And Guidance
12 Months Ended
Dec. 31, 2020
Recent Accounting Pronouncements And Guidance [Abstract]  
Recent Accounting Pronouncements And Guidance 12.Recent Accounting Pronouncements and Guidance

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. The new standard requires a modified-retrospective approach to adoption and became effective for interim and annual periods beginning on January 1, 2019. In July 2018, the FASB further amended this standard to allow for a new transition method that offers the option to use the effective date as the date of initial application and not adjust the comparative-period financial information. We adopted the new standard effective January 1, 2019, using the new transition method, recording a total of $38.7 million in right of use assets, reflected in other assets, and substantially the same amount in lease liabilities, reflected in accrued and other liabilities, for leases where we are the lessee (principally ground leases and office leases). We also reclassified related intangible assets totaling $5.6 million to other assets. The lease liabilities are recognized

based on the present value of the remaining lease payments for each operating lease using each respective remaining lease term and a corresponding estimated incremental borrowing rate. We estimated the incremental borrowing rate primarily by reference to average yield spread on debt issuances by companies of a similar credit rating as us, and the treasury yields as of January 1, 2019. We had no material amount of leases covered by the standard where we are the lessor (principally our storage leases) because substantially all of such leases are month to month. For leases where we are the lessee or the lessor, we applied (i) the package of practical expedients to not reassess prior conclusions related to contracts that are or that contain leases, lease classification and initial direct costs, (ii) the hindsight practical expedient to determine the lease term and in assessing impairment of the right of use assets, and (iii) the easement practical expedient to not assess whether existing or expired land easements that were not previously accounted for as leases under ASC 840 are or contain a lease under this new standard. In addition, for leases where we are the lessee, we also elected to (a) not apply the new standard to our leases with an original term of 12 months or less, and (b) not separate lease and associated non-lease components.
v3.20.4
Commitments And Contingencies
12 Months Ended
Dec. 31, 2020
Commitments And Contingencies [Abstract]  
Commitments And Contingencies 13.Commitments and Contingencies

Contingent Losses

We are a party to various legal proceedings and subject to various claims and complaints; however, we believe that the likelihood of these contingencies resulting in a material loss to the Company, either individually or in the aggregate, is remote.

Insurance and Loss Exposure

We carry property, earthquake, general liability, employee medical insurance and workers compensation coverage through internationally recognized insurance carriers, subject to deductibles. Our deductible for general liability is $2.0 million per occurrence. Our annual deductible for property loss is $25.0 million per occurrence. This deductible decreases to $5.0 million once we reach $35.0 million in aggregate losses for occurrences that exceed $5.0 million. Insurance carriers’ aggregate limits on these policies of $75.0 million for property losses and $102.0 million for general liability losses are higher than estimates of maximum probable losses that could occur from individual catastrophic events determined in recent engineering and actuarial studies; however, in case of multiple catastrophic events, these limits could be exceeded.

We reinsure a program that provides insurance to our customers from an independent third-party insurer. This program covers customer claims for losses to goods stored at our facilities as a result of specific named perils (earthquakes are not covered by this program), up to a maximum limit of $5,000 per storage unit. We reinsure all risks in this program, but purchase insurance to cover this exposure for a limit of $15.0 million for losses in excess of $5.0 million per occurrence. We are subject to licensing requirements and regulations in several states. Customers participate in the program at their option. At December 31, 2020, there were approximately 990,000 certificates held by our self-storage customers, representing aggregate coverage of approximately $3.9 billion.


Construction Commitments

We have construction commitments representing future expected payments for construction under contract totaling $105.0 million at December 31, 2020. We expect to pay approximately $95.2 million in 2021 and $9.8 million in 2022 for these construction commitments.
v3.20.4
Subsequent Events
12 Months Ended
Dec. 31, 2020
Subsequent Events [Abstract]  
Subsequent Events 14.Subsequent Events

Subsequent to December 31, 2020, we acquired or were under contract to acquire 40 self-storage facilities across 18 states with 3.5 million net rentable square feet, for $580.1 million.

On January 19, 2021, we completed a public offering of $500 million aggregate principal amount of senior notes bearing interest at an annual rate of 0.875% and maturing on February 15, 2026. Interest on the senior notes is payable semi-annually, commencing August 15, 2021. In connection with the offering, we incurred a total of $3.8 million in costs.

On January 20, 2021, we redeemed our 5.4% Series B Preferred Shares, at par, for a total of $300 million in cash before payment of accrued dividends.

v3.20.4
Schedule III - Real Estate And Accumulated Depreciation
12 Months Ended
Dec. 31, 2020
Schedule III - Real Estate And Accumulated Depreciation [Abstract]  
Schedule III - Real Estate And Accumulated Depreciation

Self-storage facilities by market:

Los Angeles

225 

16,265 

455 

519,547 

942,206 

372,709

517,161 

1,317,301 

1,834,462 

798,302 

Houston

128 

10,665 

-

186,526 

469,132 

237,738

185,847 

707,549 

893,396 

315,349 

San Francisco

138 

8,980 

-

241,791 

527,127 

223,936

254,541 

738,313 

992,854 

488,482 

Dallas/Ft. Worth

124 

8,969 

-

176,962 

437,884 

132,768

178,562 

569,052 

747,614 

306,815 

Chicago

134 

8,581 

-

141,683 

408,749 

132,059

144,520 

537,971 

682,491 

382,269 

New York

96 

7,011 

-

277,121 

586,592 

205,542

283,458 

785,797 

1,069,255 

455,571 

Atlanta

106 

7,138 

1,713 

135,099 

361,503 

90,812

135,461 

451,953 

587,414 

279,284 

Seattle/Tacoma

97 

6,790 

-

198,063 

531,742 

110,562

198,710 

641,657 

840,367 

349,944 

Miami

96 

7,126 

-

243,988 

522,557 

139,116

245,881 

659,780 

905,661 

335,520 

Washington DC

91 

5,645 

-

233,905 

406,769 

121,226

239,059 

522,841 

761,900 

327,341 

Orlando/Daytona

72 

4,551 

11,589 

140,411 

253,375 

59,516

145,892 

307,410 

453,302 

166,849 

Denver

64 

4,740 

8,925 

99,547 

247,641 

98,240

100,268 

345,160 

445,428 

156,803 

Charlotte

56 

4,360 

-

80,253 

205,370 

79,349

88,116 

276,856 

364,972 

131,456 

Minneapolis/St. Paul

61 

4,721 

2,174 

115,112 

266,840 

93,719

115,277 

360,394 

475,671 

131,684 

Tampa

57 

3,878 

-

93,022 

204,543 

49,349

95,784 

251,130 

346,914 

132,562 

Philadelphia

61 

4,004 

-

56,991 

224,104 

58,839

56,012 

283,922 

339,934 

167,192 

West Palm Beach

46 

3,545 

-

156,788 

221,479 

67,459

157,496 

288,230 

445,726 

133,996 

Detroit

47 

3,350 

-

66,861 

213,857 

39,152

67,711 

252,159 

319,870 

120,220 

Phoenix

42 

2,871 

-

68,515 

213,718 

28,224

68,506 

241,951 

310,457 

112,212 

Austin

35 

2,762 

-

65,542 

149,481 

44,821

67,564 

192,280 

259,844 

91,292 

Portland

45 

2,426 

-

54,370 

150,634 

28,158

55,028 

178,134 

233,162 

107,422 

Sacramento

34 

1,959 

-

25,141 

69,409 

31,275

25,625 

100,200 

125,825 

80,386 

Raleigh

28 

1,975 

-

50,348 

99,583 

38,677

51,337 

137,271 

188,608 

66,430 

San Diego

22 

2,037 

-

73,713 

137,796 

42,682

76,223 

177,968 

254,191 

93,801 

San Antonio

28 

1,791 

-

27,566 

76,028 

27,655

27,524 

103,725 

131,249 

70,033 

Norfolk

36 

2,215 

-

47,728 

128,986 

25,014

46,843 

154,885 

201,728 

70,288 

Boston

28 

1,964 

-

80,843 

209,495 

29,287

81,409 

238,216 

319,625 

101,407 

Columbus

27 

2,015 

-

44,983 

92,001 

28,437

45,090 

120,331 

165,421 

48,804 

Oklahoma City

23 

1,645 

-

38,265 

73,968 

13,775

38,265 

87,743 

126,008 

27,343 

Baltimore

24 

1,588 

-

28,396 

92,861 

20,559

28,520 

113,296 

141,816 

75,042 

Indianapolis

26 

1,697 

-

31,636 

74,206 

17,657

32,636 

90,863 

123,499 

48,772 

St. Louis

28 

1,786 

-

22,463 

79,356 

38,025

23,106 

116,738 

139,844 

66,546 

Kansas City

25 

1,647 

-

14,567 

56,147 

35,619

14,767 

91,566 

106,333 

62,368 

Columbia

23 

1,345 

-

20,169 

57,131 

22,005

20,928 

78,377 

99,305 

38,966 

Las Vegas

21 

1,355 

-

25,038 

68,513 

11,362

24,287 

80,626 

104,913 

50,563 

Milwaukee

15 

964 

374 

13,189 

32,071 

10,281

13,158 

42,383 

55,541 

34,617 

Cincinnati

18 

1,051 

-

17,135 

46,739 

23,150

17,053 

69,971 

87,024 

32,167 

Louisville

15 

916 

-

23,563 

46,108 

7,935

23,562 

54,044 

77,606 

16,253 

Jacksonville

14 

841 

-

11,252 

27,714 

12,056

11,301 

39,721 

51,022 

33,917 

Nashville/Bowling Green

17 

1,108 

-

18,787 

35,425 

30,785

18,785 

66,212 

84,997 

31,221 

Honolulu

11 

807 

-

54,184 

106,299 

14,098

55,101 

119,480 

174,581 

68,300 

Greensboro

14 

845 

-

13,413 

35,326 

13,992

15,502 

47,229 

62,731 

27,695 

Colorado Springs

14 

992 

-

10,588 

38,237 

22,564

10,585 

60,804 

71,389 

30,357 

Chattanooga

10 

697 

-

6,569 

26,045 

7,651

6,371 

33,894 

40,265 

16,037 

Hartford/New Haven

11 

693 

-

6,778 

19,959 

22,327

8,443 

40,621 

49,064 

33,355 

Savannah

12 

700 

-

33,094 

42,465 

4,118

31,766 

47,911 

79,677 

18,038 

Charleston

14 

950 

-

16,947 

56,793 

17,984

17,923 

73,801 

91,724 

26,832 

Fort Myers/Naples

11 

861 

-

23,298 

56,012 

5,537

23,533 

61,314 

84,847 

19,964 

New Orleans

9 

627 

-

9,205 

30,832 

6,667

9,373 

37,331 

46,704 

26,365 

Greensville/Spartanburg/Asheville

11 

622 

-

9,036 

20,767 

10,334

9,965 

30,172 

40,137 

21,772 

Reno

7 

559 

-

5,487 

18,704 

4,163

5,487 

22,867 

28,354 

12,925 

Birmingham

15 

606 

-

6,316 

25,567 

13,578

6,204 

39,257 

45,461 

28,113 

Salt Lake City

9 

566 

-

10,316 

19,515 

4,977

9,965 

24,843 

34,808 

15,204 

Memphis

11 

645 

-

19,581 

29,852 

9,551

20,934 

38,050 

58,984 

21,854 

Buffalo/Rochester

9 

462 

-

6,785 

17,954 

3,980

6,783 

21,936 

28,719 

14,492 

Richmond

13 

650 

-

18,092 

40,160 

5,948

17,897 

46,303 

64,200 

20,124 

Tucson

7 

439 

-

9,403 

25,491 

5,868

9,884 

30,878 

40,762 

20,371 

Cleveland/Akron

7 

434 

-

4,070 

16,139 

5,538

4,463 

21,284 

25,747 

12,947 

Wichita

7 

433 

-

2,017 

6,691 

7,350

2,130 

13,928 

16,058 

12,067 

Mobile

11 

529 

-

8,915 

25,223 

5,077

8,742 

30,473 

39,215 

14,061 

Omaha

5 

430 

-

8,261 

23,709 

3,456

8,261 

27,165 

35,426 

4,505 

Monterey/Salinas

7 

329 

-

8,465 

24,151 

4,307

8,455 

28,468 

36,923 

22,179 

Palm Springs

3 

242 

-

8,309 

18,065 

1,387

8,309 

19,452 

27,761 

11,193 

Evansville

5 

326 

-

2,340 

14,316 

1,333

2,312 

15,677 

17,989 

4,248 

Dayton

5 

284 

-

1,074 

8,975 

4,850

1,073 

13,826 

14,899 

7,522 

Augusta

7 

392 

-

6,213 

15,979 

4,081

6,213 

20,060 

26,273 

6,765 

Fort Wayne

3 

168 

-

349 

3,594 

3,194

349 

6,788 

7,137 

5,882 

Providence

3 

155 

-

995 

11,206 

3,008

995 

14,214 

15,209 

6,866 

Huntsville/Decatur

5 

298 

-

9,161 

13,481 

3,051

9,108 

16,585 

25,693 

6,089 

Shreveport

2 

150 

-

817 

3,030 

2,301

741 

5,407 

6,148 

4,851 

Springfield/Holyoke

2 

144 

-

1,428 

3,380 

1,910

1,427 

5,291 

6,718 

4,913 

Rochester

2 

99 

-

1,047 

2,246 

2,107

980 

4,420 

5,400 

4,098 

Santa Barbara

2 

98 

-

5,733 

9,106 

468

5,733 

9,574 

15,307 

5,797 

Topeka

2 

94 

-

225 

1,419 

2,090

225 

3,509 

3,734 

3,081 

Lansing

2 

88 

-

556 

2,882 

936

556 

3,818 

4,374 

2,428 

Roanoke

3 

159 

-

2,147 

13,801 

908

2,147 

14,709 

16,856 

3,141 

Flint

1 

56 

-

543 

3,068 

260

542 

3,329 

3,871 

1,967 

Joplin

1 

56 

-

264 

904 

1,014

264 

1,918 

2,182 

1,626 

Syracuse

1 

55 

-

545 

1,279 

846

545 

2,125 

2,670 

2,032 

Modesto/Fresno/Stockton

1 

33 

-

44 

206 

983

193 

1,040 

1,233 

862 

Commercial and non-operating

real estate

-

13,796 

21,761 

42,591

14,836 

63,312 

78,148 

41,728 

2,548 

175,050 

$25,230

$4,313,285

$9,903,429

$3,155,913

$4,375,588

$12,997,039

$17,372,627

$7,152,135

Note: Buildings and improvements are depreciated on a straight-line basis over estimated useful lives ranging generally

between 5 to 25 years. In addition, disclosures of the number and square footage of our facilities are unaudited.

v3.20.4
Summary Of Significant Accounting Policies (Policy)
12 Months Ended
Dec. 31, 2020
Summary Of Significant Accounting Policies [Abstract]  
Basis of Presentation Basis of Presentation

The financial statements are presented on an accrual basis in accordance with U.S. generally accepted accounting principles (“GAAP”) as defined in the Financial Accounting Standards Board Accounting Standards Codification (the “Codification”).

Certain amounts previously reported in our December 31, 2019 and 2018 financial statements have been reclassified to conform to the December 31, 2020 presentation, including revenues from our third party management activities of $8.3 million and $5.2 million for the years ended December 31, 2019 and 2018, respectively, previously reported within interest and other income; and cost of operations from our third party management activities of $6.5 million and $3.4 million for the years ended December 31, 2019 and 2018, respectively, previously reported within interest and other income. This reclassification had no impact on the our balance sheet, statements of comprehensive income, statements of equity, or cash flows as of and for the year ended December 31, 2019 and for the year ended 2018.

Additionally, we revised our prior period financial statements to correct the presentation of share-based compensation expense between general and administrative expense and self-storage cost of operations. As a result, we revised our statements of income for the years ended December 31, 2019 and 2018 with an increase in self-storage cost of operations of $9.8 million and $14.0 million, respectively, and a corresponding decrease to general and administrative expenses. This immaterial correction had no impact on our total expenses or net income. The correction also had no impact on our balance sheet, statements of comprehensive income, statements of equity, or cash flows as of and for the year ended December 31, 2019 and for the year ended 2018.

Consolidation and Equity Method of Accounting Consolidation and Equity Method of Accounting

We consider entities to be Variable Interest Entities (“VIEs”) when they have insufficient equity to finance their activities without additional subordinated financial support provided by other parties, or the equity holders as a group do not have a controlling financial interest. We consolidate VIEs when we have (i) the power to direct the activities most significantly impacting economic performance, and (ii) either the obligation to absorb losses or the right to receive benefits from the VIE. We have no involvement with any material VIEs. We consolidate all other entities when we control them through voting shares or contractual rights. The entities we consolidate, for the period in which the reference applies, are referred to collectively as the “Subsidiaries,” and we eliminate intercompany transactions and balances.

We account for our investments in entities that we do not consolidate but have significant influence over using the equity method of accounting. These entities, for the periods in which the reference applies, are referred to collectively as the “Unconsolidated Real Estate Entities,” eliminating intra-entity profits and losses and amortizing any differences between the cost of our investment and the underlying equity in net assets against equity in earnings as if the Unconsolidated Real Estate Entity were a consolidated subsidiary.

Equity in earnings of unconsolidated real estate entities presented on our income statements represents our pro-rata share of the earnings of the Unconsolidated Real Estate Entities. The dividends we receive from the Unconsolidated Real Estate Entities are reflected on our statements of cash flows as “distributions from cumulative equity in earnings of unconsolidated real estate entities” to the extent of our cumulative equity in earnings, with any excess classified as “distributions in excess of cumulative equity in earnings from unconsolidated real estate entities.”

When we begin consolidating an entity, we reflect our preexisting equity interest at book value. All changes in consolidation status are reflected prospectively.

Collectively, at December 31, 2020, the Company and the Subsidiaries own 2,548 self-storage facilities and four commercial facilities in the U.S. At December 31, 2020, the Unconsolidated Real Estate Entities are comprised of PSB and Shurgard.

Use of Estimates Use of Estimates

The financial statements and accompanying notes reflect our estimates and assumptions. Actual results could differ from those estimates and assumptions.

Income Taxes Income Taxes

We have elected to be treated as a REIT, as defined in the Internal Revenue Code of 1986, as amended (the “Code”). For each taxable year in which we qualify for taxation as a REIT, we will not be subject to U.S. federal corporate income tax on our “REIT taxable income” (generally, taxable income subject to specified adjustments, including a deduction for dividends paid and excluding our net capital gain) that is distributed to our shareholders. We believe we have met these REIT requirements for all periods presented herein. Accordingly, we have recorded no U.S. federal corporate income tax expense related to our REIT taxable income.

Our tenant reinsurance, merchandise and third party management operations are subject to corporate income tax and such taxes are included in ancillary cost of operations. We also incur income and other taxes in certain states, which are included in general and administrative expense.

We recognize tax benefits of uncertain income tax positions that are subject to audit only if we believe it is more likely than not that the position would ultimately be sustained assuming the relevant taxing authorities

had full knowledge of the relevant facts and circumstances of our positions. As of December 31, 2020, we had no tax benefits that were not recognized.

Real Estate Facilities Real Estate Facilities

Real estate facilities are recorded at cost. We capitalize all costs incurred to acquire, develop, construct, renovate and improve facilities, including interest and property taxes incurred during the construction period. We allocate the net acquisition cost of acquired real estate facilities to the underlying land, buildings, and identified intangible assets based upon their respective individual estimated fair values.

Costs associated with dispositions of real estate, as well as repairs and maintenance costs, are expensed as incurred. We depreciate buildings and improvements on a straight-line basis over estimated useful lives ranging generally between 5 to 25 years.

When we sell a full or partial interest in a real estate facility without retaining a controlling interest following sale, we recognize a gain or loss on sale as if 100% of the property was sold at fair value. If we retain a controlling interest following the sale, we record a noncontrolling interest for the book value of the partial interest sold, and recognize additional paid-in capital for the difference between the consideration received and the partial interest at book value.

Other Assets Other Assets

Other assets primarily consist of rents receivable from our tenants (net of an allowance for uncollectible amounts), prepaid expenses, restricted cash and right-to-use assets. At December 31, 2019, other assets included notes receivable which were amortized on the effective interest method with book value of $4.4 million at the time they were repaid during 2020, at their respective $7.5 million contractual note balance. The $3.1 million excess proceeds were recorded as interest and other income in 2020.

Accrued and Other Liabilities Accrued and Other Liabilities

Accrued and other liabilities consist primarily of rents prepaid by our tenants, trade payables, property tax accruals, accrued payroll, accrued tenant reinsurance losses, lease liabilities, and contingent loss accruals when probable and estimable. We believe the fair value of our accrued and other liabilities approximates book value, due primarily to the short period until repayment. We disclose the nature of significant unaccrued losses that are reasonably possible of occurring and, if estimable, a range of exposure.

Cash Equivalents, Restricted Cash, Marketable Securities and Other Financial Instruments Cash Equivalents, Restricted Cash, Marketable Securities and Other Financial Instruments

Cash equivalents represent highly liquid financial instruments such as money market funds with daily liquidity or short-term commercial paper or treasury securities maturing within three months of acquisition. Cash and equivalents which are restricted from general corporate use are included in other assets. We believe that the book value of all such financial instruments for all periods presented approximates fair value, due to the short period to maturity.

Fair Value Fair Value

As used herein, the term “fair value” is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Because our estimates of fair value involve considerable judgment, including determination of the factors that market participants would consider in negotiating exchange values, such estimates may be limited in their ability to reflect what would actually be realized in an actual market exchange.

We estimate the fair value of our cash and equivalents, marketable securities, other assets, debt, and other liabilities by discounting the related future cash flows at a rate based upon quoted interest rates for securities that have similar characteristics such as credit quality and time to maturity. Such quoted interest rates are referred to generally as “Level 2” inputs.

We use significant judgment to estimate fair values of investments in real estate, goodwill, and other intangible assets. In estimating their values, we consider significant unobservable inputs such as market prices of land, market capitalization rates, expected returns, earnings multiples, projected levels of earnings, costs of construction, and functional depreciation. These inputs are referred to generally as “Level 3” inputs.

Currency and Credit Risk Currency and Credit Risk

Financial instruments that are exposed to credit risk consist primarily of cash and equivalents, certain portions of other assets including rents receivable from our tenants (net of an allowance for uncollectible receivables based upon expected losses in the portfolio) and restricted cash. Cash equivalents we invest in are either money market funds with a rating of at least AAA by Standard & Poor’s, commercial paper that is rated A1 by Standard & Poor’s or deposits with highly rated commercial banks.

At December 31, 2020, due primarily to our investment in Shurgard (Note 4) and our notes payable denominated in Euros (Note 6), our operating results and financial position are affected by fluctuations in currency exchange rates between the Euro, and to a lesser extent, other European currencies, against the U.S. Dollar.

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

Intangible assets are comprised of goodwill, the “Shurgard” trade name, and finite-lived assets.

Goodwill totaled $174.6 million at December 31, 2020 and 2019. The “Shurgard” trade name, which is used by Shurgard pursuant to a fee-based licensing agreement, has a book value of $18.8 million at December 31, 2020 and 2019. Goodwill and the “Shurgard” trade name have indefinite lives and are not amortized.

Our finite-lived assets are comprised primarily of (i) acquired customers in place amortized relative to the benefit of the customers in place, with such amortization reflected as depreciation and amortization expense on our income statement and (ii) property tax abatements amortized relative to the reduction in property tax paid, with such amortization reflected as self-storage cost of operations on our income statement. At December 31, 2020, these intangibles had a net book value of $11.3 million ($12.5 million at December 31, 2019). Accumulated amortization totaled $27.3 million at December 31, 2020 ($27.5 million at December 31, 2019), and amortization expense of $16.1 million, $16.8 million and $16.6 million was recorded in 2020, 2019 and 2018, respectively.

The estimated future amortization expense for our finite-lived intangible assets at December 31, 2020 is approximately $11.9 million in 2021, $2.6 million in 2022 and $5.6 million thereafter. During 2020, 2019 and 2018, intangibles increased $14.9 million, $18.5 million and $11.6 million, respectively, in connection with the acquisition of self-storage facilities (Note 3).

Evaluation of Asset Impairment Evaluation of Asset Impairment

We evaluate our real estate and finite-lived intangible assets for impairment each quarter. If there are indicators of impairment and we determine that the asset is not recoverable from future undiscounted cash flows to be received through the asset’s remaining life (or, if earlier, the expected disposal date), we record an impairment charge to the extent the carrying amount exceeds the asset’s estimated fair value or net proceeds from expected disposal.

We evaluate our investments in unconsolidated real estate entities for impairment on a quarterly basis. We record an impairment charge to the extent the carrying amount exceeds estimated fair value, when we believe any such shortfall is other than temporary.

We evaluate goodwill for impairment annually and whenever relevant events, circumstances and other related factors indicate that fair value of the related reporting unit may be less than the carrying amount. If we determine that the fair value of the reporting unit exceeds the aggregate carrying amount, no impairment charge is recorded. Otherwise, we record an impairment charge to the extent the carrying amount of the goodwill exceeds the amount that would be allocated to goodwill if the reporting unit were acquired for estimated fair value.

We evaluate other indefinite-lived intangible assets, such as the “Shurgard” trade name for impairment at least annually and whenever relevant events, circumstances and other related factors indicate that the fair value is less than the carrying amount. When we conclude that it is likely that the asset is not impaired, we do not record an impairment charge and no further analysis is performed. Otherwise, we record an impairment charge to the extent the carrying amount exceeds the asset’s estimated fair value.

No impairments were recorded in any of our evaluations for any period presented herein.

Revenue and Expense Recognition Revenue and Expense Recognition

Revenues from self-storage facilities, which are primarily composed of rental income earned pursuant to month-to-month leases, as well as associated late charges and administrative fees, are recognized as earned. Promotional discounts reduce rental income over the promotional period, which is generally one month. Ancillary revenues and interest and other income are recognized when earned.

We accrue for property tax expense based upon actual amounts billed and, in some circumstances, estimates when bills or assessments have not been received from the taxing authorities. If these estimates are incorrect, the timing and amount of expense recognition could be incorrect. Cost of operations (including advertising expenditures), general and administrative expense, and interest expense are expensed as incurred.

Foreign Currency Exchange Translation Foreign Currency Exchange Translation

The local currency (primarily the Euro) is the functional currency for our interests in foreign operations. The related balance sheet amounts are translated into U.S. Dollars at the exchange rates at the respective financial statement date, while amounts on our statements of income are translated at the average exchange rates during the respective period. When financial instruments denominated in a currency other than the U.S. Dollar are expected to be settled in cash in the foreseeable future, the impact of changes in the U.S. Dollar equivalent are reflected in current earnings. The Euro was translated at exchange rates of approximately 1.226 U.S. Dollars per Euro at December 31, 2020 (1.122 at December 31, 2019), and average exchange rates of 1.141, 1.120 and 1.181 for the years ended December 31, 2020, 2019 and 2018, respectively. Cumulative translation adjustments, to the extent not included in cumulative net income, are included in equity as a component of accumulated other comprehensive income (loss).

Comprehensive Income Comprehensive Income

Total comprehensive income represents net income, adjusted for changes in other comprehensive income (loss) for the applicable period, which are comprised primarily of foreign currency exchange gains and losses on our investment in Shurgard.

Recent Accounting Pronouncements And Guidance Recent Accounting Pronouncements and Guidance

In November 2018, the FASB issued ASU 2018- 19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses," which clarified that credit losses with respect to receivables arising from operating leases are to be evaluated within the scope of the leasing standard (ASU 2016-02), rather than within the scope of ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” We adopted this new standard on its effective date for us of January 1, 2020, which did not have a material impact on our consolidated financial statements.

Net Income Per Common Share Net Income per Common Share

Net income is allocated to (i) noncontrolling interests based upon their share of the net income of the Subsidiaries and (ii) preferred shareholders, to the extent redemption cost exceeds the related original net issuance proceeds (an “EITF D-42 allocation”), with the remaining net income allocated to each of our equity securities based upon the dividends declared or accumulated during the period, combined with participation rights in undistributed earnings.

Basic and diluted net income per common share are each calculated based upon net income allocable to common shareholders presented on the face of our income statement, divided by (i) in the case of basic net income per common share, weighted average common shares, and (ii) in the case of diluted income per share, weighted average common shares adjusted for the impact, if dilutive, of stock options outstanding (Note 10). The following table reconciles from basic to diluted common shares outstanding (amounts in thousands):

For the Years Ended

December 31,

2020

2019

2018

Weighted average common shares and equivalents

outstanding:

Basic weighted average common

shares outstanding

174,494

174,287

173,969

Net effect of dilutive stock options -

based on treasury stock method

148

243

328

Diluted weighted average common

shares outstanding

174,642

174,530

174,297

v3.20.4
Summary Of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Summary Of Significant Accounting Policies [Abstract]  
Net Income Per Common Share

For the Years Ended

December 31,

2020

2019

2018

Weighted average common shares and equivalents

outstanding:

Basic weighted average common

shares outstanding

174,494

174,287

173,969

Net effect of dilutive stock options -

based on treasury stock method

148

243

328

Diluted weighted average common

shares outstanding

174,642

174,530

174,297

v3.20.4
Real Estate Facilities (Tables)
12 Months Ended
Dec. 31, 2020
Real Estate Facilities [Abstract]  
Schedule Of Real Estate Activities

For the Years Ended

2020

2019

2018

(Amounts in thousands)

Operating facilities, at cost:

Beginning balance

$

16,289,146

$

15,296,844

$

14,665,989

Capital expenditures to maintain real estate facilities

163,834

192,539

139,397

Acquisitions

781,219

421,097

169,436

Dispositions

(303)

(426)

(25,633)

Developed or expanded facilities opened for operation

138,731

379,092

348,270

Impact of foreign exchange rate changes

-

-

(615)

Ending balance

17,372,627

16,289,146

15,296,844

Accumulated depreciation:

Beginning balance

(6,623,475)

(6,140,072)

(5,700,331)

Depreciation expense

(528,660)

(483,408)

(457,029)

Dispositions

-

5

16,876

Impact of foreign exchange rate changes

-

-

412

Ending balance

(7,152,135)

(6,623,475)

(6,140,072)

Construction in process:

Beginning balance

141,934

285,339

264,441

Costs incurred to develop and expand real estate facilities

188,102

235,687

362,397

Write-off of cancelled projects

(3,226)

-

-

Developed or expanded facilities opened for operation

(138,731)

(379,092)

(348,270)

Dispositions

-

-

(2,698)

Transfer from other assets

-

-

9,469

Ending balance

188,079

141,934

285,339

Total real estate facilities at December 31,

$

10,408,571

$

9,807,605

$

9,442,111

v3.20.4
Investments In Unconsolidated Real Estate Entities (Tables)
12 Months Ended
Dec. 31, 2020
Investments In Unconsolidated Real Estate Entities [Abstract]  
Schedule Of Investments In Real Estate Entities And Equity In Earnings Of Real Estate Entities

Investments in Unconsolidated Real Estate

Equity in Earnings of Unconsolidated Real Estate

Entities at December 31,

Entities for the Year Ended December 31,

2020

2019

2020

2019

2018

PSB

$

431,963

$

427,875

$

64,835

$

54,090

$

89,362

Shurgard

341,083

339,941

15,662

15,457

14,133

Total

$

773,046

$

767,816

$

80,497

$

69,547

$

103,495

v3.20.4
Notes Payable (Tables)
12 Months Ended
Dec. 31, 2020
Notes Payable [Abstract]  
Notes Payable

Amounts at December 31, 2020

Coupon

Effective

Unamortized

Book

Fair

Rate

Rate

Principal

Costs

Value

Value

($ amounts in thousands)

U.S. Dollar Denominated Unsecured Debt

Notes due September 15, 2022

2.370%

2.483%

$

500,000 

$

(891)

$

499,109 

$

517,419 

Notes due September 15, 2027

3.094%

3.218%

500,000 

(3,548)

496,452 

560,833 

Notes due May 1, 2029

3.385%

3.459%

500,000 

(2,567)

497,433 

574,833 

1,500,000 

(7,006)

1,492,994 

1,653,085 

Euro Denominated Unsecured Debt

Notes due April 12, 2024

1.540%

1.540%

122,646 

-

122,646 

129,192 

Notes due November 3, 2025

2.175%

2.175%

296,821 

-

296,821 

323,552 

Notes due January 24, 2032

0.875%

0.978%

613,232 

(5,931)

607,301 

634,389 

1,032,699 

(5,931)

1,026,768 

1,087,133 

Mortgage Debt, secured by 27

real estate facilities with a net

book value of $102.1 million

3.962%

3.947%

25,230 

-

25,230 

26,958 

$

2,557,929 

$

(12,937)

$

2,544,992 

$

2,767,176 

Amounts at

December 31, 2019

Book

Fair

Value

Value

($ amounts in thousands)

U.S. Dollar Denominated Unsecured Debt

Notes due September 15, 2022

$

498,581 

$

505,639 

Notes due September 15, 2027

495,924 

520,694 

Notes due May 1, 2029

497,124 

531,911 

1,491,629 

1,558,244 

Euro Denominated Unsecured Debt

Notes due April 12, 2024

112,156 

115,932 

Notes due November 3, 2025

271,433 

298,398 

Notes due January 24, 2032

-

-

383,589 

414,330 

Mortgage Debt

27,275 

28,506 

$

1,902,493 

$

2,001,080 

Maturities Of Notes Payable

Unsecured

Mortgage

Debt

Debt

Total

2021

$

-

$

1,851

$

1,851

2022

500,000

2,574

502,574

2023

-

19,219

19,219

2024

122,646

124

122,770

2025

296,821

131

296,952

Thereafter

1,613,232

1,331

1,614,563

$

2,532,699

$

25,230

$

2,557,929

Weighted average effective rate

2.4%

3.9%

2.4%

v3.20.4
Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Shareholders’ Equity [Abstract]  
Preferred Shares Outstanding

At December 31, 2020

At December 31, 2019

Series

Earliest Redemption Date

Dividend Rate

Shares Outstanding

Liquidation Preference

Shares Outstanding

Liquidation Preference

(Dollar amounts in thousands)

Series V

9/20/2017

5.375%

-

$

-

19,800

$

495,000

Series W

1/16/2018

5.200%

-

-

20,000

500,000

Series X

3/13/2018

5.200%

-

-

9,000

225,000

Series B

1/20/2021

5.400%

-

-

12,000

300,000

Series C

5/17/2021

5.125%

8,000

200,000

8,000

200,000

Series D

7/20/2021

4.950%

13,000

325,000

13,000

325,000

Series E

10/14/2021

4.900%

14,000

350,000

14,000

350,000

Series F

6/2/2022

5.150%

11,200

280,000

11,200

280,000

Series G

8/9/2022

5.050%

12,000

300,000

12,000

300,000

Series H

3/11/2024

5.600%

11,400

285,000

11,400

285,000

Series I

9/12/2024

4.875%

12,650

316,250

12,650

316,250

Series J

11/15/2024

4.700%

10,350

258,750

10,350

258,750

Series K

12/20/2024

4.750%

9,200

230,000

9,200

230,000

Series L

6/17/2025

4.625%

22,600

565,000

-

-

Series M

8/14/2025

4.125%

9,200

230,000

-

-

Series N

10/6/2025

3.875%

11,300

282,500

-

-

Series O

11/17/2025

3.900%

6,800

170,000

-

-

Total Preferred Shares

151,700

$

3,792,500

162,600

$

4,065,000

Schedule Of Issuance And Repurchases Of Common Shares

2020

2019

2018

Shares

Amount

Shares

Amount

Shares

Amount

Employee stock-based compensation and

exercise of stock options (Note 10)

163,127 

$

12,664 

287,734 

$

33,564 

277,511 

$

12,525 

Schedule Of Distribution Classification

2020 (unaudited)

1st Quarter

2nd Quarter

3rd Quarter

4th Quarter

Ordinary Income

100.00

%

100.00

%

100.00

%

100.00

%

Long-Term Capital Gain

0.00

%

0.00

%

0.00

%

0.00

%

Total

100.00

%

100.00

%

100.00

%

100.00

%

v3.20.4
Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-Based Compensation [Abstract]  
Share-Based Compensation Options Outstanding Rollforward

2020

2019

2018

Weighted

Weighted

Weighted

Average

Average

Average

Number

Exercise

Number

Exercise

Number

Exercise

of

Price

of

Price

of

Price

Options

per Share

Options

per Share

Options

per Share

Options outstanding January 1,

2,339,667 

$

204.53 

2,420,922 

$

201.31 

2,408,917 

$

192.12 

Granted

840,000 

226.58 

120,000 

221.12 

200,000 

194.29 

Exercised

(71,500)

175.16 

(191,255)

174.55 

(179,995)

69.53 

Cancelled

(147,000)

222.67 

(10,000)

197.90 

(8,000)

223.50 

Options outstanding December 31,

2,961,167 

$

210.59 

2,339,667 

$

204.53 

2,420,922 

$

201.31 

Options exercisable at December 31,

1,585,091 

$

199.54 

1,501,667 

$

196.37 

1,147,122 

$

178.31 

Share-Based Compensation Valuation Assumptions

2020

2019

2018

Stock option expense for the year (in 000's) (a)

$

7,613 

$

4,950 

$

17,162 

Aggregate exercise date intrinsic value of options exercised during the year (in 000's)

$

3,433 

$

11,848 

$

25,117 

Average assumptions used in valuing options with the Black-Scholes method:

Expected life of options in years, based upon historical experience

5 

5 

5 

Risk-free interest rate

0.43%

2.3%

2.7%

Expected volatility, based upon historical volatility

21.6%

8.9%

12.5%

Expected dividend yield

3.8%

3.6%

4.1%

Average estimated value of options granted during the year

$

17.79 

$

9.61 

$

13.09 

(a) Amounts for 2020 include $0.3 million in connection with the Retirement Acceleration. Amounts for 2018 include $8.1 million, in connection with the acceleration of amortization on grants discussed above. Of the total expense recorded, $2.8 million, $2.2 million and $2.1 million for 2020, 2019 and 2018,

respectively, was allocated to cost of operations, with the remainder allocated to general and administrative expense.

Share-Based Compensation Restricted Units Outstanding And Vesting

2020

2019

2018

Number of

Grant Date

Number of

Grant Date

Number of

Grant Date

Restricted

Aggregate

Restricted

Aggregate

Restricted

Aggregate

Share Units

Fair Value

Share Units

Fair Value

Share Units

Fair Value

Restricted share units outstanding January 1,

619,150 

$

132,058 

717,696 

$

151,212 

799,129 

$

166,144 

Granted

110,755 

24,617 

97,140 

21,113 

138,567 

27,733 

Vested

(140,089)

(28,141)

(160,329)

(32,714)

(164,104)

(30,717)

Forfeited

(37,028)

(7,964)

(35,357)

(7,553)

(55,896)

(11,948)

Restricted share units outstanding December 31,

552,788 

$

120,570 

619,150 

$

132,058 

717,696 

$

151,212 

Share-Based Compensation Shares Vesting During Year

2020

2019

2018

Amounts for the year (in 000's, except number of shares):

Fair value of vested shares on vesting date

$

31,076 

$

33,769 

$

32,317 

Cash paid for taxes upon vesting in lieu of issuing common shares

$

10,518 

$

12,162 

$

12,347 

Common shares issued upon vesting

91,627 

96,479 

97,516 

Restricted share unit expense (a)

$

26,359 

$

21,662 

$

53,869 

(a)Amounts for 2020, 2019 and 2018 include approximately $1.3 million, $1.2 million and $1.1 million, respectively, in employer taxes incurred upon vesting. Amounts for 2020 include $5.4 million, in connection with the Retirement Acceleration as discussed above. Amounts for 2018 include $22.6 million, in connection with the acceleration of amortization on grants to our CEO and CFO as discussed above. Of the total expense recorded, $12.1 million, $9.9 million and $14.3 million for 2020, 2019 and 2018, respectively, was allocated to cost of operations, with the remainder allocated to general and administrative expense.

v3.20.4
Segment Information (Tables)
12 Months Ended
Dec. 31, 2020
Segment Information [Abstract]  
Summary Of Segment Information

For the Years Ended December 31,

2020

2019

2018

Self-Storage Segment

Revenue

$

2,721,630 

$

2,684,552 

$

2,597,607 

Cost of operations

(807,543)

(762,416)

(709,739)

Net operating income

1,914,087 

1,922,136 

1,887,868 

Depreciation and amortization

(553,257)

(512,918)

(483,646)

Net income

1,360,830 

1,409,218 

1,404,222 

Ancillary Segment

Revenue

193,438 

170,556 

161,916 

Cost of operations

(59,919)

(50,736)

(47,344)

Net operating income

133,519 

119,820 

114,572 

Investment in PSB Segment (a) - Equity in earnings of unconsolidated entities

64,835 

54,090 

89,362 

Investment in Shurgard Segment (a) - Equity in earnings of unconsolidated entities

15,662 

15,457 

14,133 

Gain due to Shurgard public offering

-

-

151,616 

Net income from Investment in Shurgard Segment

15,662 

15,457 

165,749 

Total net income allocated to segments

1,574,846 

1,598,585 

1,773,905 

Other items not allocated to segments:

General and administrative

(83,199)

(62,146)

(104,712)

Interest and other income

22,323 

26,683 

24,552 

Interest expense

(56,283)

(45,641)

(32,542)

Foreign currency exchange (loss) gain

(97,953)

7,829 

18,117 

Gain on sale of real estate

1,493 

341 

37,903 

Net income

$

1,361,227 

$

1,525,651 

$

1,717,223 

(a)See Note 4 for a reconciliation of these amounts to our total Equity in Earnings of Unconsolidated Real Estate Entities on our income statements.

v3.20.4
Description Of The Business (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
ft²
country
item
state
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Oct. 15, 2018
Nature Of Business [Line Items]        
Net rentable area (in square feet) 175,050      
Public Storage [Member]        
Nature Of Business [Line Items]        
PSA self-storage facilities | item 2,548      
Net rentable area (in square feet) 175,100,000      
Number of states with facilities | state 38      
Public Storage [Member] | Commercial and Retail Space [Member]        
Nature Of Business [Line Items]        
Net rentable area (in square feet) 900,000      
Shurgard [Member]        
Nature Of Business [Line Items]        
Net rentable area (in square feet) 13,000,000      
Shares owned | shares 31,268,459 31,268,459 31,268,459  
Ownership interest, percentage 35.00%     35.00%
Number of facilities owned by Shurgard | item 241      
Number of countries in which entity operates | country 7      
PSB [Member]        
Nature Of Business [Line Items]        
Net rentable area (in square feet) 27,700,000      
Number of states with facilities | state 6      
Ownership interest, percentage 42.00%      
v3.20.4
Summary Of Significant Accounting Policies (Basis Of Presentation) (Narrative) (Details) - Reclassification Adjustment [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]    
Increased self storage revenue and decrease interest and other income $ 8.3 $ 5.2
Increased self storage cost of operations and increased interest and other income 6.5 3.4
Increased self storage cost of operations and decrease general and administrative expense $ 9.8 $ 14.0
v3.20.4
Summary Of Significant Accounting Policies (Consolidation And Equity Method Of Accounting) (Narrative) (Details) - U.S. [Member]
Dec. 31, 2020
item
Summary Of Significant Accounting Policies [Line Items]  
Number of self-storage facilities owned 2,548
Commercial facilities in U.S. 4
v3.20.4
Summary Of Significant Accounting Policies (Income Taxes) (Narrative) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Abstract]  
Unrecognized tax benefits $ 0
v3.20.4
Summary Of Significant Accounting Policies (Real Estate Facilities) (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
Percentage of interest in real estate sold at fair value 100.00%
Maximum [Member]  
Estimated useful lives of buildings and improvements 25 years
Minimum [Member]  
Estimated useful lives of buildings and improvements 5 years
v3.20.4
Summary Of Significant Accounting Policies (Other Assets) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]    
Note receivable, book value   $ 4,400
Note receivable, contractual balance   $ 7,500
Repayment of note receivable $ 7,509  
Interest and other income $ 3,100  
v3.20.4
Summary Of Significant Accounting Policies (Goodwill And Other Intangible Assets) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]      
Goodwill balance $ 174.6 $ 174.6  
Shurgard trade name, book value 18.8 18.8  
In-place and leasehold interests in land, net book value 11.3 12.5  
In-place and leasehold interests in land, accumulated amortization 27.3 27.5  
In-place and leasehold interests in land, amortization expense 16.1 16.8 $ 16.6
Estimated future amortization expense, 2021 11.9    
Estimated future amortization expense, 2022 2.6    
Estimated future amortization expense, thereafter 5.6    
Increase in in-place and leasehold interests in land $ 14.9 $ 18.5 $ 11.6
v3.20.4
Summary Of Significant Accounting Policies (Evaluation Of Asset Impairment) (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Abstract]  
Impairments $ 0.0
v3.20.4
Summary Of Significant Accounting Policies (Foreign Currency Exchange Translation) (Narrative) (Details) - $ / €
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trading Activity, Gains and Losses, Net [Line Items]      
Exchange rate translation 1.226 1.122  
Weighted Average [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Exchange rate translation 1.141 1.120 1.181
v3.20.4
Summary Of Significant Accounting Policies (Net Income Per Common Share) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]      
Basic weighted average common shares outstanding 174,494 174,287 173,969
Net effect of dilutive stock options - based on treasury stock method 148 243 328
Diluted weighted average common shares outstanding 174,642 174,530 174,297
v3.20.4
Real Estate Facilities (Narrative) (Details)
$ in Thousands
12 Months Ended
Oct. 25, 2018
USD ($)
Oct. 18, 2018
USD ($)
Dec. 31, 2020
USD ($)
ft²
item
Dec. 31, 2019
USD ($)
ft²
item
Dec. 31, 2018
USD ($)
ft²
item
Schedule Of Real Estate Facilities [Line Items]          
Net rentable square feet | ft²     175,050    
Cash to acquire self-storage facilities     $ 792,266 $ 437,758 $ 181,020
Write-off of cancelled projects     3,226    
Gain on real estate sales     1,493 341 37,903
Increase (decrease) in accrued unpaid construction costs     (1,300) (49,000) 22,400
Increase (decrease) in accrued capital expenditures to maintain real estate facilities     (6,200) $ 5,200 (1,600)
Real estate facilities for federal tax purposes     $ 11,200,000    
Transfer from other assets         9,469
Disposal of Real Estate Facilities [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Cash proceeds from sale of real estate facilities         3,400
Gain on real estate sales         1,800
Disposal of Commercial Facility [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Cash proceeds from sale of real estate facilities $ 8,700        
Gain on real estate sales $ 4,600        
West London [Member] | Disposal of Real Estate [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Cash proceeds from sale of real estate facilities   $ 42,100      
Gain on real estate sales   31,500      
Cumulative other comprehensive loss, foreign currency translation   $ (4,800)      
Development and Redevelopment [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Aggregate costs to develop and expand         $ 348,300
Addtional net rentable square feet | ft²         3,000,000.0
Acquisition Of Self-Storage Facilities Other Investments [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Number of operating self-storage facilities | item     62 44 25
Net rentable square feet | ft²     5,100,000 3,100,000 1,600,000
Total cost of acquisition     $ 792,300 $ 439,600  
Liability assumed     3,800    
Allocated to intangible assets     14,900 18,500 $ 11,600
Cash to acquire self-storage facilities       437,800 $ 181,000
Mortgage debt assumed       $ 1,800  
Acquisition Of Commercial Facility [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Number of operating self-storage facilities | item       1  
Net rentable square feet | ft²       46,000  
Newly Developed and Expansion Projects [Member] | Completed Developed and Expansion Project [Member]          
Schedule Of Real Estate Facilities [Line Items]          
Aggregate costs to develop and expand     $ 138,700 $ 379,100  
Addtional net rentable square feet | ft²     1,100,000 3,700,000  
v3.20.4
Real Estate Facilities (Schedule Of Real Estate Activities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Real Estate Facilities [Abstract]      
Beginning balance (Operating facilities, at cost) $ 16,289,146 $ 15,296,844 $ 14,665,989
Capital expenditures to maintain real estate facilities 163,834 192,539 139,397
Acquisitions 781,219 421,097 169,436
Dispositions (303) (426) (25,633)
Developed or expanded facilities opened for operation 138,731 379,092 348,270
Impact of foreign exchange rate changes     (615)
Ending balance (Operating facilities, at cost) 17,372,627 16,289,146 15,296,844
Beginning balance (Accumulated depreciation) (6,623,475) (6,140,072) (5,700,331)
Depreciation expense (528,660) (483,408) (457,029)
Dispositions   5 16,876
Impact of foreign exchange rate changes     412
Ending balance (Accumulated depreciation) (7,152,135) (6,623,475) (6,140,072)
Beginning balance (Construction in process) 141,934 285,339 264,441
Costs incurred to develop and expand real estate facilities 188,102 235,687 362,397
Write-off of cancelled projects (3,226)    
Developed or expanded facilities opened for operation (138,731) (379,092) (348,270)
Dispositions     (2,698)
Transfer from other assets     9,469
Ending balance (Construction in process) 188,079 141,934 285,339
Total real estate facilities at December 31 $ 10,408,571 $ 9,807,605 $ 9,442,111
v3.20.4
Investments In Unconsolidated Real Estate Entities (Investment in PSB) (Narrative) (Details) - PSB [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common stock owned of PSB 7,158,354 7,158,354 7,158,354
Limited partnership units in PSB 7,305,355 7,305,355 7,305,355
Ownership interest, percentage 42.00%    
Limited partnership units option to convert to common stock, conversion basis. 1    
Closing price per share $ 132.87    
Market value $ 1,900.0    
Cash distribution received 60.7 $ 60.7 $ 55.0
Basis differential 3.4 4.2  
Amortization of basis differential $ 0.8 $ 3.2 $ 1.8
v3.20.4
Investments In Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
$ / €
shares
Dec. 31, 2020
USD ($)
€ / shares
$ / €
shares
Dec. 31, 2019
USD ($)
$ / €
shares
Dec. 31, 2019
€ / shares
$ / €
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2020
€ / shares
Oct. 15, 2018
€ / shares
shares
Schedule of Equity Method Investments [Line Items]              
Gain due to Shurgard Europe public offering         $ 151,616    
Exchange rate translation | $ / € 1.226 1.226 1.122 1.122      
Shurgard [Member]              
Schedule of Equity Method Investments [Line Items]              
Shares owned | shares 31,268,459 31,268,459 31,268,459 31,268,459 31,268,459    
Ownership interest, percentage 35.00% 35.00%         35.00%
Gain due to Shurgard Europe public offering         $ 151,600    
Increase in investment         174,000    
Reduction to other comprehensive loss, foreign currency translation         (22,400)    
Closing price per share | € / shares           € 35.50  
Exchange rate translation | $ / € 1.226 1.226          
Market value $ 1,400,000 $ 1,400,000          
Cash distribution received 34,900   $ 23,100   145,400    
Change in investment from foreign currency exchange rates 21,500   (800)   16,000    
Common stock dividends paid per share | € / shares   $ 0.99   € 0.67      
Shurgard [Member]              
Schedule of Equity Method Investments [Line Items]              
Shares issued | shares             25,000,000.0
Price per share | € / shares             € 23
Trademark License [Member] | Shurgard [Member]              
Schedule of Equity Method Investments [Line Items]              
Cash distribution received $ 1,100   $ 1,000   $ 1,300    
v3.20.4
Investments In Unconsolidated Real Estate Entities (Schedule Of Investments In Real Estate Entities And Equity In Earnings Of Real Estate Entities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Investments in Unconsolidated Real Estate Entities $ 773,046 $ 767,816  
Equity in Earnings of Unconsolidated Real Estate Entities 80,497 69,547 $ 103,495
PSB [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in Unconsolidated Real Estate Entities 431,963 427,875  
Equity in Earnings of Unconsolidated Real Estate Entities 64,835 54,090 89,362
Shurgard [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in Unconsolidated Real Estate Entities 341,083 339,941  
Equity in Earnings of Unconsolidated Real Estate Entities $ 15,662 $ 15,457 $ 14,133
v3.20.4
Credit Facility (Narrative) (Details) - Credit Facility [Member] - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Feb. 24, 2021
Schedule Of Debt [Line Items]      
Credit Facility borrowing capacity $ 500,000,000    
Expiration of Credit Facility Apr. 19, 2024    
Interest rate spread (LIBOR) 0.70%    
Frequency of commitment fee quarterly    
Commitment fee percentage 0.07%    
Outstanding borrowings $ 0    
Reduction in borrowing capacity to amount of letters of credit $ 24,300,000 $ 15,900,000  
Minimum [Member]      
Schedule Of Debt [Line Items]      
Interest rate spread (LIBOR) 0.70%    
Commitment fee percentage 0.07%    
Maximum [Member]      
Schedule Of Debt [Line Items]      
Interest rate spread (LIBOR) 1.35%    
Commitment fee percentage 0.25%    
Subsequent Event [Member]      
Schedule Of Debt [Line Items]      
Outstanding borrowings     $ 0
v3.20.4
Notes Payable (Narrative) (Details)
12 Months Ended
Jan. 24, 2020
USD ($)
Apr. 12, 2016
USD ($)
Nov. 03, 2015
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 24, 2020
EUR (€)
Apr. 12, 2019
USD ($)
Apr. 12, 2016
EUR (€)
Nov. 03, 2015
EUR (€)
Debt Instrument [Line Items]                    
Proceeds from Issuance of Debt       $ 545,151,000 $ 496,900,000          
Foreign currency exchange (loss) gain       (97,953,000) 7,829,000 $ 18,117,000        
Cash paid for interest expense       52,700,000 48,300,000 36,300,000        
Interest capitalized as real estate       $ 3,400,000 $ 3,900,000 $ 4,800,000        
Mortgage Notes [Member]                    
Debt Instrument [Line Items]                    
Interest rate         3.90%          
Mortgage debt assumed         $ 1,800,000          
Mortgage Notes [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Interest rate       3.20%            
Maturity date       Jan. 01, 2022            
Mortgage Notes [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Interest rate       7.10%            
Maturity date       Jul. 01, 2030            
U.S. Dollar Denominated Unsecured Debt [Member]                    
Debt Instrument [Line Items]                    
Debt to Total Assets ratio       8.00%            
Adjusted EBTIDA to interest Expense ratio       38            
U.S. Dollar Denominated Unsecured Debt [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Adjusted EBTIDA to interest Expense ratio       1.5            
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due May 1, 2029 [Member]                    
Debt Instrument [Line Items]                    
Issuance date       Apr. 12, 2019            
Debt issuance amount               $ 500,000,000    
Debt issuance costs               $ 3,100,000    
Interest rate       3.385%       3.385%    
Maturity date       May 01, 2029 May 01, 2029          
U.S. Dollar Denominated Unsecured Debt [Member] | Maximum Covenant [Member]                    
Debt Instrument [Line Items]                    
Debt to Total Assets ratio       65.00%            
Euro Denominated Unsecured Debt [Member]                    
Debt Instrument [Line Items]                    
Number of tranches | item       3            
Euro Denominated Unsecured Debt [Member] | Notes Due November 3, 2025 [Member]                    
Debt Instrument [Line Items]                    
Issuance date       Nov. 03, 2015            
Debt issuance amount | €                   € 242,000,000.0
Interest rate       2.175%            
Maturity date       Nov. 03, 2025 Nov. 03, 2025          
Proceeds from Issuance of Debt     $ 264,300,000              
Euro Denominated Unsecured Debt [Member] | Notes Due April 12, 2024 [Member]                    
Debt Instrument [Line Items]                    
Issuance date       Apr. 12, 2016            
Debt issuance amount | €                 € 100,000,000.0  
Interest rate       1.54%            
Maturity date       Apr. 12, 2024 Apr. 12, 2024          
Proceeds from Issuance of Debt   $ 113,600,000                
Euro Denominated Unsecured Debt [Member] | Notes Due January 24, 2032 [Member]                    
Debt Instrument [Line Items]                    
Debt issuance amount | €             € 500,000,000.0      
Interest rate       0.875%            
Maturity date       Jan. 24, 2032            
Proceeds from Issuance of Debt $ 545,200,000                  
v3.20.4
Notes Payable (Notes Payable) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Apr. 12, 2019
Principal $ 2,557,929    
Unamortized Costs (12,937)    
Book Value 2,544,992 $ 1,902,493  
Fair Value 2,767,176 2,001,080  
U.S. Dollar Denominated Unsecured Debt [Member]      
Principal 1,500,000    
Unamortized Costs (7,006)    
Book Value 1,492,994 1,491,629  
Fair Value $ 1,653,085 1,558,244  
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due September 15, 2022 [Member]      
Coupon Rate 2.37%    
Effective Rate 2.483%    
Principal $ 500,000    
Unamortized Costs (891)    
Book Value 499,109 498,581  
Fair Value $ 517,419 $ 505,639  
Maturity date Sep. 15, 2022 Sep. 15, 2022  
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due September 15, 2027 [Member]      
Coupon Rate 3.094%    
Effective Rate 3.218%    
Principal $ 500,000    
Unamortized Costs (3,548)    
Book Value 496,452 $ 495,924  
Fair Value $ 560,833 $ 520,694  
Maturity date Sep. 15, 2027 Sep. 15, 2027  
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due May 1, 2029 [Member]      
Coupon Rate 3.385%   3.385%
Effective Rate 3.459%    
Principal $ 500,000    
Unamortized Costs (2,567)    
Book Value 497,433 $ 497,124  
Fair Value $ 574,833 $ 531,911  
Maturity date May 01, 2029 May 01, 2029  
Euro Denominated Unsecured Debt [Member]      
Principal $ 1,032,699    
Unamortized Costs (5,931)    
Book Value 1,026,768 $ 383,589  
Fair Value $ 1,087,133 414,330  
Euro Denominated Unsecured Debt [Member] | Notes Due April 12, 2024 [Member]      
Coupon Rate 1.54%    
Effective Rate 1.54%    
Principal $ 122,646    
Book Value 122,646 112,156  
Fair Value $ 129,192 $ 115,932  
Maturity date Apr. 12, 2024 Apr. 12, 2024  
Euro Denominated Unsecured Debt [Member] | Notes Due November 3, 2025 [Member]      
Coupon Rate 2.175%    
Effective Rate 2.175%    
Principal $ 296,821    
Book Value 296,821 $ 271,433  
Fair Value $ 323,552 $ 298,398  
Maturity date Nov. 03, 2025 Nov. 03, 2025  
Euro Denominated Unsecured Debt [Member] | Notes Due January 24, 2032 [Member]      
Coupon Rate 0.875%    
Effective Rate 0.978%    
Principal $ 613,232    
Unamortized Costs (5,931)    
Book Value 607,301  
Fair Value $ 634,389  
Maturity date Jan. 24, 2032    
Mortgage Debt [Member]      
Coupon Rate 3.962%    
Effective Rate 3.947%    
Principal $ 25,230    
Book Value 25,230 27,275  
Fair Value $ 26,958 $ 28,506  
Mortgage Debt [Member] | Secured By Real Estate Facilities [Member]      
Real estate facilities securing debt | item 27    
Net book value of real estate facilities securing notes payable $ 102,100    
v3.20.4
Notes Payable (Maturities Of Notes Payable) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Total debt $ 2,557,929
Unsecured Debt [Member]  
Debt Instrument [Line Items]  
2022 500,000
2024 122,646
2025 296,821
Thereafter 1,613,232
Total debt $ 2,532,699
Weighted average effective rate 2.40%
Mortgage Debt [Member]  
Debt Instrument [Line Items]  
2021 $ 1,851
2022 2,574
2023 19,219
2024 124
2025 131
Thereafter 1,331
Total debt $ 25,230
Weighted average effective rate 3.90%
Total [Member]  
Debt Instrument [Line Items]  
2021 $ 1,851
2022 502,574
2023 19,219
2024 122,770
2025 296,952
Thereafter 1,614,563
Total debt $ 2,557,929
Weighted average effective rate 2.40%
v3.20.4
Noncontrolling Interests (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
item
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Noncontrolling Interest [Line Items]      
Distributions paid $ 5,366 $ 6,672 $ 7,022
Acquisition of noncontrolling interests 33 35,000  
Contributions by noncontrolling interests $ 2,629 4,148 1,720
Noncontrolling Interests [Member]      
Noncontrolling Interest [Line Items]      
Permanent noncontrolling interest in subsidiaries, number of self-storage facilities | item 21    
Permanent noncontrolling interest in subsidiaries, number of self-storage facilities under construction | item 5    
Convertible partnership units | shares 231,978    
Income allocated to other permanent noncontrolling interest in subsidiaries $ 4,000 5,100 6,200
Distributions paid 5,366 6,672 7,022
Acquisition of noncontrolling interests 1 11,087  
Contributions by noncontrolling interests 2,629 4,148 $ 1,720
Paid-In Capital [Member]      
Noncontrolling Interest [Line Items]      
Acquisition of noncontrolling interests $ 32 $ 23,913  
v3.20.4
Shareholders' Equity (Preferred Shares) (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 14, 2020
USD ($)
Dec. 31, 2020
USD ($)
item
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Class of Stock [Line Items]        
Number of quarterly dividends in arrearage before preferred shareholders can elect additional board members | item   6    
Number of additional board members the preferred shareholders can elect in the case of an excess arrearage of quarterly dividends | item   2    
Affirmative vote of outstanding shares of a series of Preferred Shares required for any material and adverse amendment to the terms of series, percent   66.67%    
Affirmative vote of outstanding shares of all Preferred Shares, voting as a single class, required to issue shares ranking senior to Preferred Shares, percent   66.67%    
Redemption price per share | $ / shares   $ 25.00    
Gross proceeds from issuance of preferred stock   $ 1,208,206 $ 1,059,156  
EITF D-42 allocations   48,265 32,693
Liquidation value (at par)   3,792,500 4,065,000  
Series V, Series W and Series X Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, redemption amount   $ 1,220,000    
Series B Preferred Stock [Member]        
Class of Stock [Line Items]        
Dividend rate percentage 5.40% 5.40%    
EITF D-42 allocations $ 9,900      
Liquidation value (at par) $ 300,000   300,000  
Series L, Series M, Series N and Series O Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued | shares   49,900,000    
Preferred shares per depositary share | shares   0.001    
Shares issued, price per share | $ / shares   $ 25.00    
Gross proceeds from issuance of preferred stock   $ 1,250,000    
Original issuance costs on preferred shares redeemed during the period   $ 39,300    
Series U, Series Y, Series Z and Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, redemption amount     $ 1,050,000  
Series H, Series I, Series J and Series K Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued | shares     43,600,000  
Preferred shares per depositary share | shares     0.001  
Shares issued, price per share | $ / shares     $ 25.00  
Gross proceeds from issuance of preferred stock     $ 1,090,000  
Original issuance costs on preferred shares redeemed during the period     $ 30,800,000  
v3.20.4
Shareholders' Equity (Common Shares) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shareholders’ Equity [Abstract]      
Number of shares authorized for repurchase 35,000,000.0    
Aggregate amount of shares repurchased pursuant to authorization 23,700,000    
Shares repurchased pursuant to authorization 0 0 0
Common shares reserved in connection with share-based incentive plan 3,513,955 2,958,817  
Common shares reserved for conversion of Convertable Partnership Units 231,978 231,978  
Common shares and restricted shares, dividends $ 1,399,361 $ 1,398,570 $ 1,396,364
Common shares and restricted shares, dividends per share $ 8.00 $ 8.00 $ 8.00
Preferred shares, dividends $ 207,068 $ 210,179 $ 216,316
v3.20.4
Shareholders' Equity (Preferred Shares Outstanding) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 14, 2020
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Preferred stock, shares outstanding   151,700 162,600
Liquidation Preference   $ 3,792,500 $ 4,065,000
Series V Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Sep. 20, 2017  
Dividend Rate %   5.375%  
Preferred stock, shares outstanding     19,800
Liquidation Preference     $ 495,000
Series W Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Jan. 16, 2018  
Dividend Rate %   5.20%  
Preferred stock, shares outstanding     20,000
Liquidation Preference     $ 500,000
Series X Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Mar. 13, 2018  
Dividend Rate %   5.20%  
Preferred stock, shares outstanding     9,000
Liquidation Preference     $ 225,000
Series B Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Jan. 20, 2021  
Dividend Rate % 5.40% 5.40%  
Preferred stock, shares outstanding     12,000
Liquidation Preference $ 300,000   $ 300,000
Series C Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   May 17, 2021  
Dividend Rate %   5.125%  
Preferred stock, shares outstanding   8,000 8,000
Liquidation Preference   $ 200,000 $ 200,000
Series D Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Jul. 20, 2021  
Dividend Rate %   4.95%  
Preferred stock, shares outstanding   13,000 13,000
Liquidation Preference   $ 325,000 $ 325,000
Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Oct. 14, 2021  
Dividend Rate %   4.90%  
Preferred stock, shares outstanding   14,000 14,000
Liquidation Preference   $ 350,000 $ 350,000
Series F Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Jun. 02, 2022  
Dividend Rate %   5.15%  
Preferred stock, shares outstanding   11,200 11,200
Liquidation Preference   $ 280,000 $ 280,000
Series G Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Aug. 09, 2022  
Dividend Rate %   5.05%  
Preferred stock, shares outstanding   12,000 12,000
Liquidation Preference   $ 300,000 $ 300,000
Series H Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Mar. 11, 2024  
Dividend Rate %   5.60%  
Preferred stock, shares outstanding   11,400 11,400
Liquidation Preference   $ 285,000 $ 285,000
Series I Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Sep. 12, 2024  
Dividend Rate %   4.875%  
Preferred stock, shares outstanding   12,650 12,650
Liquidation Preference   $ 316,250 $ 316,250
Series J Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Nov. 15, 2024  
Dividend Rate %   4.70%  
Preferred stock, shares outstanding   10,350 10,350
Liquidation Preference   $ 258,750 $ 258,750
Series K Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Dec. 20, 2024  
Dividend Rate %   4.75%  
Preferred stock, shares outstanding   9,200 9,200
Liquidation Preference   $ 230,000 $ 230,000
Series L Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Jun. 17, 2025  
Dividend Rate %   4.625%  
Preferred stock, shares outstanding   22,600  
Liquidation Preference   $ 565,000  
Series M Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Aug. 14, 2025  
Dividend Rate %   4.125%  
Preferred stock, shares outstanding   9,200  
Liquidation Preference   $ 230,000  
Series N Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Oct. 06, 2025  
Dividend Rate %   3.875%  
Preferred stock, shares outstanding   11,300  
Liquidation Preference   $ 282,500  
Series O Preferred Stock [Member]      
Class of Stock [Line Items]      
Earliest Redemption Date   Nov. 17, 2025  
Dividend Rate %   3.90%  
Preferred stock, shares outstanding   6,800  
Liquidation Preference   $ 170,000  
v3.20.4
Shareholders' Equity (Schedule Of Issuance And Repurchases Of Common Shares) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee stock-based compensation and exercise of stock options (Note 10), Shares 163,127 287,734 277,511
Employee stock-based compensation and exercise of stock options (Note 10), Amount $ 12,664 $ 33,564 $ 12,525
Common Shares [Member]      
Employee stock-based compensation and exercise of stock options (Note 10), Amount 16 29 28
Paid-In Capital [Member]      
Employee stock-based compensation and exercise of stock options (Note 10), Amount 12,648 33,535 12,497
Total Public Storage Shareholders' Equity [Member]      
Employee stock-based compensation and exercise of stock options (Note 10), Amount $ 12,664 $ 33,564 $ 12,525
v3.20.4
Shareholders' Equity (Schedule Of Distribution Classification) (Details)
3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Shareholders’ Equity [Abstract]        
Ordinary Income 100.00% 100.00% 100.00% 100.00%
Long-Term Capital Gain 0.00% 0.00% 0.00% 0.00%
Total 100.00% 100.00% 100.00% 100.00%
v3.20.4
Related Party Transactions (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]      
Tenants reinsurance premiums earned by subsidiaries | $ $ 1.6 $ 1.5 $ 1.3
Hughes Family [Member]      
Related Party Transaction [Line Items]      
Percentage ownership of common shares outstanding 13.00%    
Canada [Member] | Hughes Family [Member]      
Related Party Transaction [Line Items]      
Number of self-storage facilities | item 64    
Ownership interest 0.00%    
Maximum [Member] | Canada [Member] | Hughes Family [Member]      
Related Party Transaction [Line Items]      
Percentage ownership of common shares outstanding 1.00%    
v3.20.4
Share-Based Compensation (Stock Options) (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
employee
$ / shares
shares
Dec. 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated compensation expense | $ $ 5.7      
Granted, Number of Options 840,000 120,000 200,000  
Stock options outstanding 2,961,167 2,339,667 2,420,922 2,408,917
Stock options exercisable 1,585,091 1,501,667 1,147,122  
Exercisable, average exercise price per share | $ / shares $ 199.54 $ 196.37 $ 178.31  
Chief Executive Officer and Chief Financial Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of executives retiring | employee     2  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period, number of years 10 years      
Compensation expense | $ $ 2.8 $ 2.2 $ 2.1  
Stock options outstanding, aggregate intrinsic value | $ $ 63.2      
Average remaining contractual lives 6 years      
Aggregate intrinsic value for stock options exercisable | $ $ 52.3      
Stock options exercisable 16,667      
Expiration date Jun. 30, 2021      
Exercisable, average exercise price per share | $ / shares $ 115.96      
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense | $ $ 3.0      
Granted, Number of Options 770,000      
Performance target 100.00%      
Minimum [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, number of years 3 years      
Maximum [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, number of years 5 years      
Exercise Price Above $225 [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding 1,240,000      
Range of exercise prices, upper | $ / shares $ 225      
v3.20.4
Share-Based Compensation (Restricted Share Units) (Narrative) (Details) - Restricted Share Units [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 12.1 $ 9.9 $ 14.3
Taxes incurred upon vesting of restricted share units 1.3 $ 1.2 $ 1.1
Fair value of restricted stock units outstanding 127.7    
Restricted stock, compensation expense not yet recognized $ 76.9    
Compensation recognition period 4 years    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, number of years 5 years    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, number of years 8 years    
v3.20.4
Share-Based Compensation (Share-Based Compensation Options Outstanding Rollforward) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-Based Compensation [Abstract]      
Options outstanding January 1, Number of Options 2,339,667 2,420,922 2,408,917
Granted, Number of Options 840,000 120,000 200,000
Exercised, Number of Options (71,500) (191,255) (179,995)
Cancelled, Number of Options (147,000) (10,000) (8,000)
Options outstanding December 31, Number of Options 2,961,167 2,339,667 2,420,922
Options exercisable at December 31, Number of Options 1,585,091 1,501,667 1,147,122
Options outstanding January 1, Weighted Average Exercise Price Per Share $ 204.53 $ 201.31 $ 192.12
Granted, Weighted Average Exercise Price Per Share 226.58 221.12 194.29
Exercised. Weighted Average Exercise Price Per Share 175.16 174.55 69.53
Cancelled, Weighted Average Exercise Price Per Share 222.67 197.90 223.50
Options outstanding December 31, Weighted Average Exercise Price Per Share 210.59 204.53 201.31
Options exercisable at December 31, Weighted Average Exercise Price Per Share $ 199.54 $ 196.37 $ 178.31
v3.20.4
Share-Based Compensation (Share-Based Compensation Valuation Assumptions) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option expense for the year $ 7,613 $ 4,950 $ 17,162
Aggregate exercise date intrinsic value of options exercised during the year $ 3,433 $ 11,848 $ 25,117
Expected life of options in years, based upon historical experience 5 years 5 years 5 years
Risk-free interest rate 0.43% 2.30% 2.70%
Expected volatility, based upon historical volatility 21.60% 8.90% 12.50%
Expected dividend yield 3.80% 3.60% 4.10%
Average estimated value of options granted during the year $ 17.79 $ 9.61 $ 13.09
Acceleration of amortization on grants $ 300   $ 8,100
v3.20.4
Share-Based Compensation (Share-Based Compensation Restricted Units) (Details) - Restricted Share Units [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units outstanding January 1, Number Of Restricted Share Units 619,150 717,696 799,129
Granted, Number Of Restricted Share Units 110,755 97,140 138,567
Vested, Number Of Restricted Share Units (140,089) (160,329) (164,104)
Forfeited, Number Of Restricted Share Units (37,028) (35,357) (55,896)
Restricted share units outstanding December 31, Number Of Restricted Share Units 552,788 619,150 717,696
Restricted share units outstanding January 1, Grant Date Aggregate Fair Value $ 132,058 $ 151,212 $ 166,144
Granted, Grant Date Aggregate Fair Value 24,617 21,113 27,733
Vested, Grant Date Aggregate Fair Value (28,141) (32,714) (30,717)
Forfeited, Grant Date Aggregate Fair Value (7,964) (7,553) (11,948)
Restricted share units outstanding December 31, Grant Date Aggregate Fair Value $ 120,570 $ 132,058 $ 151,212
v3.20.4
Share-Based Compensation (Share-Based CompensationShares Vesting During Year) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of vested shares on vesting date $ 31,076 $ 33,769 $ 32,317
Cash paid for taxes upon vesting in lieu of issuing common shares $ 10,518 $ 12,162 $ 12,347
Common shares issued upon vesting 91,627 96,479 97,516
Restricted share unit expense $ 26,359 $ 21,662 $ 53,869
Restricted Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Taxes incurred upon vesting of restricted share units 1,300 $ 1,200 1,100
Chief Executive Officer and Chief Financial Officer [Member] | Restricted Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Acceleration of amortization on grants $ 5,400   $ 22,600
v3.20.4
Segment Information (Narrative) (Details) - country
Dec. 31, 2020
Oct. 15, 2018
PSB [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership interest, percentage 42.00%  
Shurgard [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership interest, percentage 35.00% 35.00%
Number of countries in which entity operates 7  
v3.20.4
Segment Information (Summary Of Segment Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenue $ 2,915,068 $ 2,855,108 $ 2,759,523
Cost of operations (807,543) (762,416) (709,739)
Cost of operations (59,919) (50,736) (47,344)
Depreciation and amortization (553,257) (512,918) (483,646)
Equity in earnings of unconsolidated real estate entities 80,497 69,547 103,495
Gain due to Shurgard public offering     151,616
General and administrative (83,199) (62,146) (104,712)
Interest and other income 22,323 26,683 24,552
Interest expense (56,283) (45,641) (32,542)
Foreign currency exchange (loss) gain (97,953) 7,829 18,117
Gain on sale of real estate 1,493 341 37,903
Net income 1,361,227 1,525,651 1,717,223
Self-Storage Operations [Member]      
Segment Reporting Information [Line Items]      
Revenue 2,721,630 2,684,552 2,597,607
Cost of operations (807,543) (762,416) (709,739)
Net operating income 1,914,087 1,922,136 1,887,868
Depreciation and amortization (553,257) (512,918) (483,646)
Net income 1,360,830 1,409,218 1,404,222
Ancillary Operations [Member]      
Segment Reporting Information [Line Items]      
Revenue 193,438 170,556 161,916
Cost of operations (59,919) (50,736) (47,344)
Net operating income 133,519 119,820 114,572
Invesment in PSB [Member]      
Segment Reporting Information [Line Items]      
Equity in earnings of unconsolidated real estate entities 64,835 54,090 89,362
Investment In Shurgard [Member]      
Segment Reporting Information [Line Items]      
Equity in earnings of unconsolidated real estate entities 15,662 15,457 14,133
Gain due to Shurgard public offering     151,616
Net income 15,662 15,457 165,749
Allocated to Segments [Member]      
Segment Reporting Information [Line Items]      
Net income 1,574,846 1,598,585 1,773,905
Other Items Not Allocated To Segments [Member]      
Segment Reporting Information [Line Items]      
General and administrative (83,199) (62,146) (104,712)
Interest and other income 22,323 26,683 24,552
Interest expense (56,283) (45,641) (32,542)
Foreign currency exchange (loss) gain (97,953) 7,829 18,117
Gain on sale of real estate $ 1,493 $ 341 $ 37,903
v3.20.4
Recent Accounting Pronouncements And Guidance (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Right of use assets   $ 38,700  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   Other assets  
Lease liabilities   $ 38,700  
Operating Lease, Liability, Statement of Financial Position [Extensible List]   Accrued Liabilities Current And Noncurrent  
Other assets $ 172,715 $ 174,344  
Accounting Standards Update 2016-02 [Member]      
Other assets     $ 5,600
v3.20.4
Commitments And Contingencies (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
item
Commitments And Contingencies [Abstract]  
Deductible for general liability $ 2,000,000.0
Deductible for property 25,000,000.0
Reduced deductible for property 5,000,000.0
Aggregate maximum losses for property 35,000,000.0
Aggregate per occurance property coverage 5,000,000.0
Aggregate limit for property coverage 75,000,000.0
Aggregate limit for general liability coverage 102,000,000.0
Tenant insurance program against claims, maximum amount 5,000
Third-party insurance coverage for claims paid exceeding amount for individual event 15,000,000.0
Third-party limit for insurance coverage claims paid for individual event $ 5,000,000.0
Tenant certificate holders participating in insurance program, approximate | item 990,000
Aggregate coverage of tenants participating in insurance program $ 3,900,000,000
Construction commitments 105,000,000.0
Construction commitments 2021 95,200,000
Construction commitments 2022 $ 9,800,000
v3.20.4
Subsequent Events (Narrative) (Details)
2 Months Ended 12 Months Ended
Jan. 20, 2021
USD ($)
Jan. 19, 2021
USD ($)
Dec. 14, 2020
Feb. 24, 2021
USD ($)
ft²
item
state
Dec. 31, 2020
ft²
Subsequent Event [Line Items]          
Net rentable area (in square feet) | ft²         175,050
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Number of self-storage facilities acquired or under contract to be acquired | item       40  
Number of states self-storage facilities acquired or under contracts to be acquired | state       18  
Net rentable area (in square feet) | ft²       3,500,000  
Total cost of acquisition       $ 580,100,000  
Series B Preferred Stock [Member]          
Subsequent Event [Line Items]          
Dividend rate percentage     5.40%   5.40%
Series B Preferred Stock [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Dividend rate percentage 5.40%        
Preferred stock, redemption amount $ 300,000,000        
Senior Notes [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Debt issuance amount   $ 500,000,000      
Interest rate   0.875%      
Maturity date   Feb. 15, 2026      
Debt issuance costs   $ 3,800,000      
v3.20.4
Schedule III - Real Estate And Accumulated Depreciation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
ft²
item
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2,548
Net Rentable Area | ft² 175,050
2020 Encumbrances $ 25,230
Initial Cost, Land 4,313,285
Initial Cost, Buildings & Improvements 9,903,429
Costs Subsequent to Acquisition 3,155,913
Gross Carrying Amount, Land 4,375,588
Gross Carrying Amount, Buildings 12,997,039
Gross Carrying Amount, Total 17,372,627
Accumulated Depreciation 7,152,135
Commercial and Non-Operating Real Estate [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Initial Cost, Land 13,796
Initial Cost, Buildings & Improvements 21,761
Costs Subsequent to Acquisition 42,591
Gross Carrying Amount, Land 14,836
Gross Carrying Amount, Buildings 63,312
Gross Carrying Amount, Total 78,148
Accumulated Depreciation $ 41,728
Minimum [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable life of buildings (years) 5 years
Maximum [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable life of buildings (years) 25 years
Los Angeles [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 225
Net Rentable Area | ft² 16,265
2020 Encumbrances $ 455
Initial Cost, Land 519,547
Initial Cost, Buildings & Improvements 942,206
Costs Subsequent to Acquisition 372,709
Gross Carrying Amount, Land 517,161
Gross Carrying Amount, Buildings 1,317,301
Gross Carrying Amount, Total 1,834,462
Accumulated Depreciation $ 798,302
Houston [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 128
Net Rentable Area | ft² 10,665
Initial Cost, Land $ 186,526
Initial Cost, Buildings & Improvements 469,132
Costs Subsequent to Acquisition 237,738
Gross Carrying Amount, Land 185,847
Gross Carrying Amount, Buildings 707,549
Gross Carrying Amount, Total 893,396
Accumulated Depreciation $ 315,349
San Francisco [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 138
Net Rentable Area | ft² 8,980
Initial Cost, Land $ 241,791
Initial Cost, Buildings & Improvements 527,127
Costs Subsequent to Acquisition 223,936
Gross Carrying Amount, Land 254,541
Gross Carrying Amount, Buildings 738,313
Gross Carrying Amount, Total 992,854
Accumulated Depreciation $ 488,482
Dallas/Ft. Worth [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 124
Net Rentable Area | ft² 8,969
Initial Cost, Land $ 176,962
Initial Cost, Buildings & Improvements 437,884
Costs Subsequent to Acquisition 132,768
Gross Carrying Amount, Land 178,562
Gross Carrying Amount, Buildings 569,052
Gross Carrying Amount, Total 747,614
Accumulated Depreciation $ 306,815
Chicago [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 134
Net Rentable Area | ft² 8,581
Initial Cost, Land $ 141,683
Initial Cost, Buildings & Improvements 408,749
Costs Subsequent to Acquisition 132,059
Gross Carrying Amount, Land 144,520
Gross Carrying Amount, Buildings 537,971
Gross Carrying Amount, Total 682,491
Accumulated Depreciation $ 382,269
New York [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 96
Net Rentable Area | ft² 7,011
Initial Cost, Land $ 277,121
Initial Cost, Buildings & Improvements 586,592
Costs Subsequent to Acquisition 205,542
Gross Carrying Amount, Land 283,458
Gross Carrying Amount, Buildings 785,797
Gross Carrying Amount, Total 1,069,255
Accumulated Depreciation $ 455,571
Atlanta [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 106
Net Rentable Area | ft² 7,138
2020 Encumbrances $ 1,713
Initial Cost, Land 135,099
Initial Cost, Buildings & Improvements 361,503
Costs Subsequent to Acquisition 90,812
Gross Carrying Amount, Land 135,461
Gross Carrying Amount, Buildings 451,953
Gross Carrying Amount, Total 587,414
Accumulated Depreciation $ 279,284
Seattle/Tacoma [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 97
Net Rentable Area | ft² 6,790
Initial Cost, Land $ 198,063
Initial Cost, Buildings & Improvements 531,742
Costs Subsequent to Acquisition 110,562
Gross Carrying Amount, Land 198,710
Gross Carrying Amount, Buildings 641,657
Gross Carrying Amount, Total 840,367
Accumulated Depreciation $ 349,944
Miami [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 96
Net Rentable Area | ft² 7,126
Initial Cost, Land $ 243,988
Initial Cost, Buildings & Improvements 522,557
Costs Subsequent to Acquisition 139,116
Gross Carrying Amount, Land 245,881
Gross Carrying Amount, Buildings 659,780
Gross Carrying Amount, Total 905,661
Accumulated Depreciation $ 335,520
Washington DC [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 91
Net Rentable Area | ft² 5,645
Initial Cost, Land $ 233,905
Initial Cost, Buildings & Improvements 406,769
Costs Subsequent to Acquisition 121,226
Gross Carrying Amount, Land 239,059
Gross Carrying Amount, Buildings 522,841
Gross Carrying Amount, Total 761,900
Accumulated Depreciation $ 327,341
Orlando/Daytona [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 72
Net Rentable Area | ft² 4,551
2020 Encumbrances $ 11,589
Initial Cost, Land 140,411
Initial Cost, Buildings & Improvements 253,375
Costs Subsequent to Acquisition 59,516
Gross Carrying Amount, Land 145,892
Gross Carrying Amount, Buildings 307,410
Gross Carrying Amount, Total 453,302
Accumulated Depreciation $ 166,849
Denver [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 64
Net Rentable Area | ft² 4,740
2020 Encumbrances $ 8,925
Initial Cost, Land 99,547
Initial Cost, Buildings & Improvements 247,641
Costs Subsequent to Acquisition 98,240
Gross Carrying Amount, Land 100,268
Gross Carrying Amount, Buildings 345,160
Gross Carrying Amount, Total 445,428
Accumulated Depreciation $ 156,803
Charlotte [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 56
Net Rentable Area | ft² 4,360
Initial Cost, Land $ 80,253
Initial Cost, Buildings & Improvements 205,370
Costs Subsequent to Acquisition 79,349
Gross Carrying Amount, Land 88,116
Gross Carrying Amount, Buildings 276,856
Gross Carrying Amount, Total 364,972
Accumulated Depreciation $ 131,456
Minneapolis/St. Paul [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 61
Net Rentable Area | ft² 4,721
2020 Encumbrances $ 2,174
Initial Cost, Land 115,112
Initial Cost, Buildings & Improvements 266,840
Costs Subsequent to Acquisition 93,719
Gross Carrying Amount, Land 115,277
Gross Carrying Amount, Buildings 360,394
Gross Carrying Amount, Total 475,671
Accumulated Depreciation $ 131,684
Tampa [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 57
Net Rentable Area | ft² 3,878
Initial Cost, Land $ 93,022
Initial Cost, Buildings & Improvements 204,543
Costs Subsequent to Acquisition 49,349
Gross Carrying Amount, Land 95,784
Gross Carrying Amount, Buildings 251,130
Gross Carrying Amount, Total 346,914
Accumulated Depreciation $ 132,562
Philadelphia [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 61
Net Rentable Area | ft² 4,004
Initial Cost, Land $ 56,991
Initial Cost, Buildings & Improvements 224,104
Costs Subsequent to Acquisition 58,839
Gross Carrying Amount, Land 56,012
Gross Carrying Amount, Buildings 283,922
Gross Carrying Amount, Total 339,934
Accumulated Depreciation $ 167,192
West Palm Beach [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 46
Net Rentable Area | ft² 3,545
Initial Cost, Land $ 156,788
Initial Cost, Buildings & Improvements 221,479
Costs Subsequent to Acquisition 67,459
Gross Carrying Amount, Land 157,496
Gross Carrying Amount, Buildings 288,230
Gross Carrying Amount, Total 445,726
Accumulated Depreciation $ 133,996
Detroit [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 47
Net Rentable Area | ft² 3,350
Initial Cost, Land $ 66,861
Initial Cost, Buildings & Improvements 213,857
Costs Subsequent to Acquisition 39,152
Gross Carrying Amount, Land 67,711
Gross Carrying Amount, Buildings 252,159
Gross Carrying Amount, Total 319,870
Accumulated Depreciation $ 120,220
Phoenix [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 42
Net Rentable Area | ft² 2,871
Initial Cost, Land $ 68,515
Initial Cost, Buildings & Improvements 213,718
Costs Subsequent to Acquisition 28,224
Gross Carrying Amount, Land 68,506
Gross Carrying Amount, Buildings 241,951
Gross Carrying Amount, Total 310,457
Accumulated Depreciation $ 112,212
Austin [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 35
Net Rentable Area | ft² 2,762
Initial Cost, Land $ 65,542
Initial Cost, Buildings & Improvements 149,481
Costs Subsequent to Acquisition 44,821
Gross Carrying Amount, Land 67,564
Gross Carrying Amount, Buildings 192,280
Gross Carrying Amount, Total 259,844
Accumulated Depreciation $ 91,292
Portland [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 45
Net Rentable Area | ft² 2,426
Initial Cost, Land $ 54,370
Initial Cost, Buildings & Improvements 150,634
Costs Subsequent to Acquisition 28,158
Gross Carrying Amount, Land 55,028
Gross Carrying Amount, Buildings 178,134
Gross Carrying Amount, Total 233,162
Accumulated Depreciation $ 107,422
Sacramento [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 34
Net Rentable Area | ft² 1,959
Initial Cost, Land $ 25,141
Initial Cost, Buildings & Improvements 69,409
Costs Subsequent to Acquisition 31,275
Gross Carrying Amount, Land 25,625
Gross Carrying Amount, Buildings 100,200
Gross Carrying Amount, Total 125,825
Accumulated Depreciation $ 80,386
Raleigh [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 28
Net Rentable Area | ft² 1,975
Initial Cost, Land $ 50,348
Initial Cost, Buildings & Improvements 99,583
Costs Subsequent to Acquisition 38,677
Gross Carrying Amount, Land 51,337
Gross Carrying Amount, Buildings 137,271
Gross Carrying Amount, Total 188,608
Accumulated Depreciation $ 66,430
San Diego [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 22
Net Rentable Area | ft² 2,037
Initial Cost, Land $ 73,713
Initial Cost, Buildings & Improvements 137,796
Costs Subsequent to Acquisition 42,682
Gross Carrying Amount, Land 76,223
Gross Carrying Amount, Buildings 177,968
Gross Carrying Amount, Total 254,191
Accumulated Depreciation $ 93,801
San Antonio [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 28
Net Rentable Area | ft² 1,791
Initial Cost, Land $ 27,566
Initial Cost, Buildings & Improvements 76,028
Costs Subsequent to Acquisition 27,655
Gross Carrying Amount, Land 27,524
Gross Carrying Amount, Buildings 103,725
Gross Carrying Amount, Total 131,249
Accumulated Depreciation $ 70,033
Norfolk [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 36
Net Rentable Area | ft² 2,215
Initial Cost, Land $ 47,728
Initial Cost, Buildings & Improvements 128,986
Costs Subsequent to Acquisition 25,014
Gross Carrying Amount, Land 46,843
Gross Carrying Amount, Buildings 154,885
Gross Carrying Amount, Total 201,728
Accumulated Depreciation $ 70,288
Boston [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 28
Net Rentable Area | ft² 1,964
Initial Cost, Land $ 80,843
Initial Cost, Buildings & Improvements 209,495
Costs Subsequent to Acquisition 29,287
Gross Carrying Amount, Land 81,409
Gross Carrying Amount, Buildings 238,216
Gross Carrying Amount, Total 319,625
Accumulated Depreciation $ 101,407
Columbus [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 27
Net Rentable Area | ft² 2,015
Initial Cost, Land $ 44,983
Initial Cost, Buildings & Improvements 92,001
Costs Subsequent to Acquisition 28,437
Gross Carrying Amount, Land 45,090
Gross Carrying Amount, Buildings 120,331
Gross Carrying Amount, Total 165,421
Accumulated Depreciation $ 48,804
Oklahoma City [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 23
Net Rentable Area | ft² 1,645
Initial Cost, Land $ 38,265
Initial Cost, Buildings & Improvements 73,968
Costs Subsequent to Acquisition 13,775
Gross Carrying Amount, Land 38,265
Gross Carrying Amount, Buildings 87,743
Gross Carrying Amount, Total 126,008
Accumulated Depreciation $ 27,343
Baltimore [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 24
Net Rentable Area | ft² 1,588
Initial Cost, Land $ 28,396
Initial Cost, Buildings & Improvements 92,861
Costs Subsequent to Acquisition 20,559
Gross Carrying Amount, Land 28,520
Gross Carrying Amount, Buildings 113,296
Gross Carrying Amount, Total 141,816
Accumulated Depreciation $ 75,042
Indianapolis [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 26
Net Rentable Area | ft² 1,697
Initial Cost, Land $ 31,636
Initial Cost, Buildings & Improvements 74,206
Costs Subsequent to Acquisition 17,657
Gross Carrying Amount, Land 32,636
Gross Carrying Amount, Buildings 90,863
Gross Carrying Amount, Total 123,499
Accumulated Depreciation $ 48,772
St. Louis [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 28
Net Rentable Area | ft² 1,786
Initial Cost, Land $ 22,463
Initial Cost, Buildings & Improvements 79,356
Costs Subsequent to Acquisition 38,025
Gross Carrying Amount, Land 23,106
Gross Carrying Amount, Buildings 116,738
Gross Carrying Amount, Total 139,844
Accumulated Depreciation $ 66,546
Kansas City [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 25
Net Rentable Area | ft² 1,647
Initial Cost, Land $ 14,567
Initial Cost, Buildings & Improvements 56,147
Costs Subsequent to Acquisition 35,619
Gross Carrying Amount, Land 14,767
Gross Carrying Amount, Buildings 91,566
Gross Carrying Amount, Total 106,333
Accumulated Depreciation $ 62,368
Columbia [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 23
Net Rentable Area | ft² 1,345
Initial Cost, Land $ 20,169
Initial Cost, Buildings & Improvements 57,131
Costs Subsequent to Acquisition 22,005
Gross Carrying Amount, Land 20,928
Gross Carrying Amount, Buildings 78,377
Gross Carrying Amount, Total 99,305
Accumulated Depreciation $ 38,966
Las Vegas [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 21
Net Rentable Area | ft² 1,355
Initial Cost, Land $ 25,038
Initial Cost, Buildings & Improvements 68,513
Costs Subsequent to Acquisition 11,362
Gross Carrying Amount, Land 24,287
Gross Carrying Amount, Buildings 80,626
Gross Carrying Amount, Total 104,913
Accumulated Depreciation $ 50,563
Milwaukee [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 15
Net Rentable Area | ft² 964
2020 Encumbrances $ 374
Initial Cost, Land 13,189
Initial Cost, Buildings & Improvements 32,071
Costs Subsequent to Acquisition 10,281
Gross Carrying Amount, Land 13,158
Gross Carrying Amount, Buildings 42,383
Gross Carrying Amount, Total 55,541
Accumulated Depreciation $ 34,617
Cincinnati [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 18
Net Rentable Area | ft² 1,051
Initial Cost, Land $ 17,135
Initial Cost, Buildings & Improvements 46,739
Costs Subsequent to Acquisition 23,150
Gross Carrying Amount, Land 17,053
Gross Carrying Amount, Buildings 69,971
Gross Carrying Amount, Total 87,024
Accumulated Depreciation $ 32,167
Louisville [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 15
Net Rentable Area | ft² 916
Initial Cost, Land $ 23,563
Initial Cost, Buildings & Improvements 46,108
Costs Subsequent to Acquisition 7,935
Gross Carrying Amount, Land 23,562
Gross Carrying Amount, Buildings 54,044
Gross Carrying Amount, Total 77,606
Accumulated Depreciation $ 16,253
Jacksonville [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 14
Net Rentable Area | ft² 841
Initial Cost, Land $ 11,252
Initial Cost, Buildings & Improvements 27,714
Costs Subsequent to Acquisition 12,056
Gross Carrying Amount, Land 11,301
Gross Carrying Amount, Buildings 39,721
Gross Carrying Amount, Total 51,022
Accumulated Depreciation $ 33,917
Nashville/Bowling Green [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 17
Net Rentable Area | ft² 1,108
Initial Cost, Land $ 18,787
Initial Cost, Buildings & Improvements 35,425
Costs Subsequent to Acquisition 30,785
Gross Carrying Amount, Land 18,785
Gross Carrying Amount, Buildings 66,212
Gross Carrying Amount, Total 84,997
Accumulated Depreciation $ 31,221
Honolulu [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 11
Net Rentable Area | ft² 807
Initial Cost, Land $ 54,184
Initial Cost, Buildings & Improvements 106,299
Costs Subsequent to Acquisition 14,098
Gross Carrying Amount, Land 55,101
Gross Carrying Amount, Buildings 119,480
Gross Carrying Amount, Total 174,581
Accumulated Depreciation $ 68,300
Greensboro [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 14
Net Rentable Area | ft² 845
Initial Cost, Land $ 13,413
Initial Cost, Buildings & Improvements 35,326
Costs Subsequent to Acquisition 13,992
Gross Carrying Amount, Land 15,502
Gross Carrying Amount, Buildings 47,229
Gross Carrying Amount, Total 62,731
Accumulated Depreciation $ 27,695
Colorado Springs [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 14
Net Rentable Area | ft² 992
Initial Cost, Land $ 10,588
Initial Cost, Buildings & Improvements 38,237
Costs Subsequent to Acquisition 22,564
Gross Carrying Amount, Land 10,585
Gross Carrying Amount, Buildings 60,804
Gross Carrying Amount, Total 71,389
Accumulated Depreciation $ 30,357
Chattanooga [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 10
Net Rentable Area | ft² 697
Initial Cost, Land $ 6,569
Initial Cost, Buildings & Improvements 26,045
Costs Subsequent to Acquisition 7,651
Gross Carrying Amount, Land 6,371
Gross Carrying Amount, Buildings 33,894
Gross Carrying Amount, Total 40,265
Accumulated Depreciation $ 16,037
Hartford/New Haven [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 11
Net Rentable Area | ft² 693
Initial Cost, Land $ 6,778
Initial Cost, Buildings & Improvements 19,959
Costs Subsequent to Acquisition 22,327
Gross Carrying Amount, Land 8,443
Gross Carrying Amount, Buildings 40,621
Gross Carrying Amount, Total 49,064
Accumulated Depreciation $ 33,355
Savannah [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 12
Net Rentable Area | ft² 700
Initial Cost, Land $ 33,094
Initial Cost, Buildings & Improvements 42,465
Costs Subsequent to Acquisition 4,118
Gross Carrying Amount, Land 31,766
Gross Carrying Amount, Buildings 47,911
Gross Carrying Amount, Total 79,677
Accumulated Depreciation $ 18,038
Charleston [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 14
Net Rentable Area | ft² 950
Initial Cost, Land $ 16,947
Initial Cost, Buildings & Improvements 56,793
Costs Subsequent to Acquisition 17,984
Gross Carrying Amount, Land 17,923
Gross Carrying Amount, Buildings 73,801
Gross Carrying Amount, Total 91,724
Accumulated Depreciation $ 26,832
Fort Myers/Naples [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 11
Net Rentable Area | ft² 861
Initial Cost, Land $ 23,298
Initial Cost, Buildings & Improvements 56,012
Costs Subsequent to Acquisition 5,537
Gross Carrying Amount, Land 23,533
Gross Carrying Amount, Buildings 61,314
Gross Carrying Amount, Total 84,847
Accumulated Depreciation $ 19,964
New Orleans [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 9
Net Rentable Area | ft² 627
Initial Cost, Land $ 9,205
Initial Cost, Buildings & Improvements 30,832
Costs Subsequent to Acquisition 6,667
Gross Carrying Amount, Land 9,373
Gross Carrying Amount, Buildings 37,331
Gross Carrying Amount, Total 46,704
Accumulated Depreciation $ 26,365
Greensville/Spartanburg/Asheville [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 11
Net Rentable Area | ft² 622
Initial Cost, Land $ 9,036
Initial Cost, Buildings & Improvements 20,767
Costs Subsequent to Acquisition 10,334
Gross Carrying Amount, Land 9,965
Gross Carrying Amount, Buildings 30,172
Gross Carrying Amount, Total 40,137
Accumulated Depreciation $ 21,772
Reno [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 7
Net Rentable Area | ft² 559
Initial Cost, Land $ 5,487
Initial Cost, Buildings & Improvements 18,704
Costs Subsequent to Acquisition 4,163
Gross Carrying Amount, Land 5,487
Gross Carrying Amount, Buildings 22,867
Gross Carrying Amount, Total 28,354
Accumulated Depreciation $ 12,925
Birmingham [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 15
Net Rentable Area | ft² 606
Initial Cost, Land $ 6,316
Initial Cost, Buildings & Improvements 25,567
Costs Subsequent to Acquisition 13,578
Gross Carrying Amount, Land 6,204
Gross Carrying Amount, Buildings 39,257
Gross Carrying Amount, Total 45,461
Accumulated Depreciation $ 28,113
Salt Lake City [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 9
Net Rentable Area | ft² 566
Initial Cost, Land $ 10,316
Initial Cost, Buildings & Improvements 19,515
Costs Subsequent to Acquisition 4,977
Gross Carrying Amount, Land 9,965
Gross Carrying Amount, Buildings 24,843
Gross Carrying Amount, Total 34,808
Accumulated Depreciation $ 15,204
Memphis [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 11
Net Rentable Area | ft² 645
Initial Cost, Land $ 19,581
Initial Cost, Buildings & Improvements 29,852
Costs Subsequent to Acquisition 9,551
Gross Carrying Amount, Land 20,934
Gross Carrying Amount, Buildings 38,050
Gross Carrying Amount, Total 58,984
Accumulated Depreciation $ 21,854
Buffalo/Rochester [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 9
Net Rentable Area | ft² 462
Initial Cost, Land $ 6,785
Initial Cost, Buildings & Improvements 17,954
Costs Subsequent to Acquisition 3,980
Gross Carrying Amount, Land 6,783
Gross Carrying Amount, Buildings 21,936
Gross Carrying Amount, Total 28,719
Accumulated Depreciation $ 14,492
Richmond [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 13
Net Rentable Area | ft² 650
Initial Cost, Land $ 18,092
Initial Cost, Buildings & Improvements 40,160
Costs Subsequent to Acquisition 5,948
Gross Carrying Amount, Land 17,897
Gross Carrying Amount, Buildings 46,303
Gross Carrying Amount, Total 64,200
Accumulated Depreciation $ 20,124
Tucson [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 7
Net Rentable Area | ft² 439
Initial Cost, Land $ 9,403
Initial Cost, Buildings & Improvements 25,491
Costs Subsequent to Acquisition 5,868
Gross Carrying Amount, Land 9,884
Gross Carrying Amount, Buildings 30,878
Gross Carrying Amount, Total 40,762
Accumulated Depreciation $ 20,371
Cleveland/Akron [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 7
Net Rentable Area | ft² 434
Initial Cost, Land $ 4,070
Initial Cost, Buildings & Improvements 16,139
Costs Subsequent to Acquisition 5,538
Gross Carrying Amount, Land 4,463
Gross Carrying Amount, Buildings 21,284
Gross Carrying Amount, Total 25,747
Accumulated Depreciation $ 12,947
Wichita [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 7
Net Rentable Area | ft² 433
Initial Cost, Land $ 2,017
Initial Cost, Buildings & Improvements 6,691
Costs Subsequent to Acquisition 7,350
Gross Carrying Amount, Land 2,130
Gross Carrying Amount, Buildings 13,928
Gross Carrying Amount, Total 16,058
Accumulated Depreciation $ 12,067
Mobile [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 11
Net Rentable Area | ft² 529
Initial Cost, Land $ 8,915
Initial Cost, Buildings & Improvements 25,223
Costs Subsequent to Acquisition 5,077
Gross Carrying Amount, Land 8,742
Gross Carrying Amount, Buildings 30,473
Gross Carrying Amount, Total 39,215
Accumulated Depreciation $ 14,061
Omaha [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 5
Net Rentable Area | ft² 430
Initial Cost, Land $ 8,261
Initial Cost, Buildings & Improvements 23,709
Costs Subsequent to Acquisition 3,456
Gross Carrying Amount, Land 8,261
Gross Carrying Amount, Buildings 27,165
Gross Carrying Amount, Total 35,426
Accumulated Depreciation $ 4,505
Monterey/Salinas [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 7
Net Rentable Area | ft² 329
Initial Cost, Land $ 8,465
Initial Cost, Buildings & Improvements 24,151
Costs Subsequent to Acquisition 4,307
Gross Carrying Amount, Land 8,455
Gross Carrying Amount, Buildings 28,468
Gross Carrying Amount, Total 36,923
Accumulated Depreciation $ 22,179
Palm Springs [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 3
Net Rentable Area | ft² 242
Initial Cost, Land $ 8,309
Initial Cost, Buildings & Improvements 18,065
Costs Subsequent to Acquisition 1,387
Gross Carrying Amount, Land 8,309
Gross Carrying Amount, Buildings 19,452
Gross Carrying Amount, Total 27,761
Accumulated Depreciation $ 11,193
Evansville [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 5
Net Rentable Area | ft² 326
Initial Cost, Land $ 2,340
Initial Cost, Buildings & Improvements 14,316
Costs Subsequent to Acquisition 1,333
Gross Carrying Amount, Land 2,312
Gross Carrying Amount, Buildings 15,677
Gross Carrying Amount, Total 17,989
Accumulated Depreciation $ 4,248
Dayton [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 5
Net Rentable Area | ft² 284
Initial Cost, Land $ 1,074
Initial Cost, Buildings & Improvements 8,975
Costs Subsequent to Acquisition 4,850
Gross Carrying Amount, Land 1,073
Gross Carrying Amount, Buildings 13,826
Gross Carrying Amount, Total 14,899
Accumulated Depreciation $ 7,522
Augusta [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 7
Net Rentable Area | ft² 392
Initial Cost, Land $ 6,213
Initial Cost, Buildings & Improvements 15,979
Costs Subsequent to Acquisition 4,081
Gross Carrying Amount, Land 6,213
Gross Carrying Amount, Buildings 20,060
Gross Carrying Amount, Total 26,273
Accumulated Depreciation $ 6,765
Fort Wayne [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 3
Net Rentable Area | ft² 168
Initial Cost, Land $ 349
Initial Cost, Buildings & Improvements 3,594
Costs Subsequent to Acquisition 3,194
Gross Carrying Amount, Land 349
Gross Carrying Amount, Buildings 6,788
Gross Carrying Amount, Total 7,137
Accumulated Depreciation $ 5,882
Providence [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 3
Net Rentable Area | ft² 155
Initial Cost, Land $ 995
Initial Cost, Buildings & Improvements 11,206
Costs Subsequent to Acquisition 3,008
Gross Carrying Amount, Land 995
Gross Carrying Amount, Buildings 14,214
Gross Carrying Amount, Total 15,209
Accumulated Depreciation $ 6,866
Huntsville/Decatur [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 5
Net Rentable Area | ft² 298
Initial Cost, Land $ 9,161
Initial Cost, Buildings & Improvements 13,481
Costs Subsequent to Acquisition 3,051
Gross Carrying Amount, Land 9,108
Gross Carrying Amount, Buildings 16,585
Gross Carrying Amount, Total 25,693
Accumulated Depreciation $ 6,089
Shreveport [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2
Net Rentable Area | ft² 150
Initial Cost, Land $ 817
Initial Cost, Buildings & Improvements 3,030
Costs Subsequent to Acquisition 2,301
Gross Carrying Amount, Land 741
Gross Carrying Amount, Buildings 5,407
Gross Carrying Amount, Total 6,148
Accumulated Depreciation $ 4,851
Springfield/Holyoke [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2
Net Rentable Area | ft² 144
Initial Cost, Land $ 1,428
Initial Cost, Buildings & Improvements 3,380
Costs Subsequent to Acquisition 1,910
Gross Carrying Amount, Land 1,427
Gross Carrying Amount, Buildings 5,291
Gross Carrying Amount, Total 6,718
Accumulated Depreciation $ 4,913
Rochester [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2
Net Rentable Area | ft² 99
Initial Cost, Land $ 1,047
Initial Cost, Buildings & Improvements 2,246
Costs Subsequent to Acquisition 2,107
Gross Carrying Amount, Land 980
Gross Carrying Amount, Buildings 4,420
Gross Carrying Amount, Total 5,400
Accumulated Depreciation $ 4,098
Santa Barbara [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2
Net Rentable Area | ft² 98
Initial Cost, Land $ 5,733
Initial Cost, Buildings & Improvements 9,106
Costs Subsequent to Acquisition 468
Gross Carrying Amount, Land 5,733
Gross Carrying Amount, Buildings 9,574
Gross Carrying Amount, Total 15,307
Accumulated Depreciation $ 5,797
Topeka [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2
Net Rentable Area | ft² 94
Initial Cost, Land $ 225
Initial Cost, Buildings & Improvements 1,419
Costs Subsequent to Acquisition 2,090
Gross Carrying Amount, Land 225
Gross Carrying Amount, Buildings 3,509
Gross Carrying Amount, Total 3,734
Accumulated Depreciation $ 3,081
Lansing [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 2
Net Rentable Area | ft² 88
Initial Cost, Land $ 556
Initial Cost, Buildings & Improvements 2,882
Costs Subsequent to Acquisition 936
Gross Carrying Amount, Land 556
Gross Carrying Amount, Buildings 3,818
Gross Carrying Amount, Total 4,374
Accumulated Depreciation $ 2,428
Roanoke [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 3
Net Rentable Area | ft² 159
Initial Cost, Land $ 2,147
Initial Cost, Buildings & Improvements 13,801
Costs Subsequent to Acquisition 908
Gross Carrying Amount, Land 2,147
Gross Carrying Amount, Buildings 14,709
Gross Carrying Amount, Total 16,856
Accumulated Depreciation $ 3,141
Flint [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 1
Net Rentable Area | ft² 56
Initial Cost, Land $ 543
Initial Cost, Buildings & Improvements 3,068
Costs Subsequent to Acquisition 260
Gross Carrying Amount, Land 542
Gross Carrying Amount, Buildings 3,329
Gross Carrying Amount, Total 3,871
Accumulated Depreciation $ 1,967
Joplin [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 1
Net Rentable Area | ft² 56
Initial Cost, Land $ 264
Initial Cost, Buildings & Improvements 904
Costs Subsequent to Acquisition 1,014
Gross Carrying Amount, Land 264
Gross Carrying Amount, Buildings 1,918
Gross Carrying Amount, Total 2,182
Accumulated Depreciation $ 1,626
Syracuse [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 1
Net Rentable Area | ft² 55
Initial Cost, Land $ 545
Initial Cost, Buildings & Improvements 1,279
Costs Subsequent to Acquisition 846
Gross Carrying Amount, Land 545
Gross Carrying Amount, Buildings 2,125
Gross Carrying Amount, Total 2,670
Accumulated Depreciation $ 2,032
Modesto/Fresno/Stockton [Member] | Self-Storage Facilities [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | item 1
Net Rentable Area | ft² 33
Initial Cost, Land $ 44
Initial Cost, Buildings & Improvements 206
Costs Subsequent to Acquisition 983
Gross Carrying Amount, Land 193
Gross Carrying Amount, Buildings 1,040
Gross Carrying Amount, Total 1,233
Accumulated Depreciation $ 862