Investments in Unconsolidated Joint Ventures - Schedule of Investments in Unconsolidated Joint Ventures Sold (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			9 Months Ended
	May 31, 2024	Jan. 31, 2024	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Loss on Sale			$ 371		$ 0	$ 19,006	$ (79)
Employee-related liabilities			7,800			7,800
Carrying Value			293,924			293,924		$ 346,745
Depreciable real estate reserves and impairment			0		$ 389	(65,839)	$ (305,527)
Preferred Equity (4)
Schedule of Equity Method Investments [Line Items]
Carrying Value			134,474			134,474
625 Madison Avenue | Preferred Equity (4)
Schedule of Equity Method Investments [Line Items]
Carrying Value			209,900			209,900
625 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Depreciable real estate reserves and impairment				$ 5,900
625 Madison Avenue | Preferred Equity (4)
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in leasehold interest			$ 235,400			$ 235,400
Average yield (as a percent)						8.91%
717 Fifth Avenue | Joint venture | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold		10.92%
Gross Asset Valuation		$ 963,000
Loss on Sale		$ 24,900
625 Madison Avenue | Joint venture | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold	90.43%
Gross Asset Valuation	$ 634,600
Loss on Sale	$ (7,600)