Real Estate Investments - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 property
Finite-Lived Intangible Assets [Line Items]
(Gain)/loss on dispositions of real estate			$ (276)	$ 0	$ 0
Number of properties with recorded impairment | property				2		2
Impairment of real estate investments			112,541	$ 66,565	0
Gain (loss) on sale of real estate investments			(276)	0	0
Depreciation and Amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles			2,553	4,041	5,740
In-place leases | Depreciation and Amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles			2,146	3,333	5,032
421. W. 54th Street - Hit Factory
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of real estate, net				4,500
Impairment of real estate investments					$ 0
1140 Avenues of the Americas
Finite-Lived Intangible Assets [Line Items]
Impairment of real estate investments			25,800	$ 66,100
1140 Avenues of the Americas | Measurement Input, Discount Rate
Finite-Lived Intangible Assets [Line Items]
Measurement input						0.08
1140 Avenues of the Americas | Terminal Capitalization Rate
Finite-Lived Intangible Assets [Line Items]
Measurement input						0.06
9 Times Square
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of real estate, net			63,500
(Gain)/loss on dispositions of real estate			300
Impairment of real estate investments	$ 1,900	$ 84,700	86,600
Aggregate purchase price of real estate			63,500
Repayments of mortgage			49,500
Gain (loss) on sale of real estate investments			300
400 E. 67th Street - Laurel Condominiums (7)
Finite-Lived Intangible Assets [Line Items]
Impairment of real estate investments			$ 25,800