Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2023
Document and Entity Information [Abstract]
Document Type	DEF 14A
Entity Registrant Name	Sunstone Hotel Investors, Inc.
Entity Central Index Key	0001295810
Amendment Flag	false

Pay vs Performance Disclosure

12 Months Ended

Dec. 31, 2023

USD ($)

$ / shares

Dec. 31, 2022

USD ($)

$ / shares

Dec. 31, 2021

USD ($)

$ / shares

Dec. 31, 2020

USD ($)

$ / shares

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table


	Summary Compensation						Average	Average	Value of Initial Fixed
	Table Total (1)			Compensation Actually Paid (2)			Summary	Compensation	$100 Investment
	PEO 1	PEO 2	PEO 3	PEO 1	PEO 2	PEO 3	Compensation	Actually	Based On:
	John V.	Douglas M.	Bryan A.	John V.	Douglas M.	Bryan A.	Table Total	Paid		Peer	Net Income	AFFO
	Arabia	Pasquale	Giglia	Arabia	Pasquale	Giglia	Non-PEO NEOs	Non-PEO NEOs	Company	Group	(Loss)	Per Share
Year	($)	($)	($)	($)	($)	($)	($) (3)	($) (3) (4)	TSR ($)	TSR ($) (5)	($ thousands)	($) (6)
2023	—	—	4,065,496	—	—	4,271,146	2,186,607	2,288,186	80.68	94.79	206,708	0.95
2022	—	3,056,142	5,360,331	—	2,976,426	4,470,301	2,698,018	2,264,209	70.53	76.49	90,766	0.87
2021	8,161,442	2,913,754	—	8,457,333	2,891,832	—	1,933,105	2,304,828	84.75	90.32	32,995	0.09
2020	4,472,998	—	—	3,437,021	—	—	1,810,688	1,492,792	81.86	76.40	(410,506)	(0.68)

(1)	Amounts represent the compensation reported in the “Total” column for the applicable PEO in the SCT.

(2)	Amounts reported under Compensation Actually Paid (“CAP”) represent the amount of CAP to the applicable PEO, as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual amount of compensation earned by or paid to the applicable PEO during each year.

Mr. Arabia separated from employment with the Company effective as of September 2, 2021 and Mr. Pasquale ceased to serve as Interim CEO upon the appointment of Mr. Giglia as CEO on March 7, 2022.

In accordance with the requirements of Item 402(v) of Regulation S-K, the adjustments in the table below were made to the 2023 PEO’s total compensation presented to determine the CAP:


		2023
Name		Bryan A. Giglia
SCT Total Compensation	$	4,065,496
Minus SCT "Stock Awards"		(2,365,543)
Plus Fair Value at Fiscal Year ("FY") End of Outstanding and Unvested Stock Awards Granted in FY		2,330,541
Plus Change in Fair Value of Outstanding and Unvested Stock Awards Granted in Prior FYs		88,427
Plus Change in Fair Value as of Vesting Date of Stock Awards Granted in Prior FYs		152,225
CAP to PEO	$	4,271,146

Fair value or change in fair value, as applicable, of equity awards in the CAP columns was determined by (i) for time-based RSAs, the closing stock price on the applicable year-end date(s) or, in the case of awards vesting during the applicable year, the closing stock price on the applicable vesting date(s); and (ii) for performance-based RSUs, the same valuation methodology as the Performance RSUs in the SCT above, the fair value was calculated using a Monte Carlo simulation valuation model as of the applicable year-end date and including assumptions expected for volatility of our stock price, dividend yield, and risk-free rate.

(3)	The Non-PEO NEO’s include the individuals indicated in the table below for each fiscal year.


Year		Non-PEO NEOs
2023		Robert C. Springer, Aaron R. Reyes, Christopher G. Ostapovicz, and David M. Klein
2022		Robert C. Springer, Aaron R. Reyes, Christopher G. Ostapovicz, and David M. Klein
2021		Bryan A. Giglia, Robert C. Springer, David M. Klein, Christopher G. Ostapovicz, and Marc A. Hoffman
2020		Bryan A. Giglia, Marc A. Hoffman, Robert C. Springer, and David M. Klein

(4)

Amounts reported under “Average Compensation Actually Paid” represent the amount of average CAP to the Average Non-PEO NEOs, as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual average amount of compensation earned by or paid to the Non-PEO NEOs during each year. In accordance with the requirements of Item 402(v) of Regulation S-K, the adjustments in the table below were made to the average Non-PEO NEOs total compensation for 2023 to determine the CAP:


		2023
Name		Average Non-PEO NEOs
SCT Total Compensation	$	2,186,607
Minus SCT "Stock Awards"		(1,105,688)
Plus Fair Value at Fiscal Year ("FY") End of Outstanding and Unvested Stock Awards Granted in FY		1,089,328
Plus Change in Fair Value of Outstanding and Unvested Stock Awards Granted in Prior FYs		41,737
Plus Change in Fair Value as of Vesting Date of Stock Awards Granted in Prior FYs		76,202
CAP to Average Non-PEO NEOs	$	2,288,186

Fair value or change in fair value, as applicable, of equity awards in the average CAP column was determined by (i) for time-based RSAs, the closing stock price on the applicable year-end date(s) or, in the case of awards vesting during the applicable year, the closing stock price on the applicable vesting date(s); and (ii) for performance-based RSUs, the same valuation methodology as the Performance RSUs in the SCT above, the fair value was calculated using a Monte Carlo simulation valuation model as of the applicable year-end date and including assumptions expected for volatility of our stock price, dividend yield, and risk-free rate.

(5)	For each applicable fiscal year, the cumulative Peer Group TSR (the “Peer Group TSR”) represents the FTSE Nareit Equity Lodging/Resorts Index.

(6)

AFFO per share is a non-GAAP measure. We compute the AFFO per share component by adjusting FFO, which we calculate in accordance with standards established by Nareit, for certain noncash or nonrecurring items. AFFO is then divided by our weighted average number of common shares outstanding, adjusted for the assumed issuance of all potentially dilutive shares, for each applicable year. For more information, see our “Non-GAAP Financial Measures” in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations of our Annual Report on Form 10-K for the year ended December 31, 2023. Amortization of deferred stock compensation has been added to the Company adjustments to AFFO per share for 2020 and 2021 to conform to the current presentation.

Company Selected Measure Name

AFFO per share

Named Executive Officers, Footnote

(3)	The Non-PEO NEO’s include the individuals indicated in the table below for each fiscal year.


Year		Non-PEO NEOs
2023		Robert C. Springer, Aaron R. Reyes, Christopher G. Ostapovicz, and David M. Klein
2022		Robert C. Springer, Aaron R. Reyes, Christopher G. Ostapovicz, and David M. Klein
2021		Bryan A. Giglia, Robert C. Springer, David M. Klein, Christopher G. Ostapovicz, and Marc A. Hoffman
2020		Bryan A. Giglia, Marc A. Hoffman, Robert C. Springer, and David M. Klein

Peer Group Issuers, Footnote

(5)	For each applicable fiscal year, the cumulative Peer Group TSR (the “Peer Group TSR”) represents the FTSE Nareit Equity Lodging/Resorts Index.

PEO Total Compensation Amount

$ 4,065,496

PEO Actually Paid Compensation Amount

$ 4,271,146

Adjustment To PEO Compensation, Footnote

(2)	Amounts reported under Compensation Actually Paid (“CAP”) represent the amount of CAP to the applicable PEO, as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual amount of compensation earned by or paid to the applicable PEO during each year.

Mr. Arabia separated from employment with the Company effective as of September 2, 2021 and Mr. Pasquale ceased to serve as Interim CEO upon the appointment of Mr. Giglia as CEO on March 7, 2022.

In accordance with the requirements of Item 402(v) of Regulation S-K, the adjustments in the table below were made to the 2023 PEO’s total compensation presented to determine the CAP:


		2023
Name		Bryan A. Giglia
SCT Total Compensation	$	4,065,496
Minus SCT "Stock Awards"		(2,365,543)
Plus Fair Value at Fiscal Year ("FY") End of Outstanding and Unvested Stock Awards Granted in FY		2,330,541
Plus Change in Fair Value of Outstanding and Unvested Stock Awards Granted in Prior FYs		88,427
Plus Change in Fair Value as of Vesting Date of Stock Awards Granted in Prior FYs		152,225
CAP to PEO	$	4,271,146

Non-PEO NEO Average Total Compensation Amount

$ 2,186,607

$ 2,698,018

$ 1,933,105

$ 1,810,688

Non-PEO NEO Average Compensation Actually Paid Amount

$ 2,288,186

2,264,209

2,304,828

1,492,792

Adjustment to Non-PEO NEO Compensation Footnote

(4)


		2023
Name		Average Non-PEO NEOs
SCT Total Compensation	$	2,186,607
Minus SCT "Stock Awards"		(1,105,688)
Plus Fair Value at Fiscal Year ("FY") End of Outstanding and Unvested Stock Awards Granted in FY		1,089,328
Plus Change in Fair Value of Outstanding and Unvested Stock Awards Granted in Prior FYs		41,737
Plus Change in Fair Value as of Vesting Date of Stock Awards Granted in Prior FYs		76,202
CAP to Average Non-PEO NEOs	$	2,288,186

Compensation Actually Paid vs. Total Shareholder Return

Compensation Actually Paid vs. Net Income

(1)	The Company does not currently utilize Net Income (Loss) as a metric in its compensation program.

Compensation Actually Paid vs. Company Selected Measure

Tabular List, Table

The following list includes the most important performance measures used to link NEO compensation to our Company performance in 2023. See “Compensation Discussion and Analysis—2023 Compensation Decisions (Annual Cash Incentive Bonuses and Annual Equity Incentive Awards)” for a detailed description of the performance measures.

Most Important Performance Measures

Relative Total Stockholder Return

Adjusted Funds from Operations per Share

Capital Recycling

Total Shareholder Return Amount

$ 80.68

70.53

84.75

81.86

Peer Group Total Shareholder Return Amount

94.79

76.49