Investments in Partially Owned Entities (Fifth Avenue and Times Square JV) (Details) $ in Thousands			12 Months Ended
	Apr. 14, 2025 USD ($)	Jan. 08, 2025 USD ($) ft²	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of real estate			$ 37,374	$ 31,605	$ 24,484
Total revenues			1,810,425	1,787,686	1,811,163
Fee and other income
Schedule of Equity Method Investments [Line Items]
Total revenues			252,184	218,880	203,677
JV | Fee and other income | Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Total revenues			$ 4,567	4,624	4,499
JV | 1535 Broadway
Schedule of Equity Method Investments [Line Items]
Stated rate (as a percent)	6.90%
Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage			51.50%
Fifth Avenue and Times Square JV | 666 Fifth Avenue | Residential Building
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of real estate		$ 342,000
Fifth Avenue and Times Square JV | 1535 Broadway
Schedule of Equity Method Investments [Line Items]
Proceeds from financing	$ 407,000
Fifth Avenue and Times Square JV | JV
Schedule of Equity Method Investments [Line Items]
Aggregate of preferred equity interests			$ 1,079,000	1,828,000
Real estate basis difference, carrying amount			$ 709,414
Property management fee agreement percentage of income (as a percent)			2.00%
Development fee (as a percent)			5.00%
Supervisory fee (as a percent)			1.50%
Fifth Avenue and Times Square JV | JV | Fee and other income
Schedule of Equity Method Investments [Line Items]
Property management fee income			$ 3,538	$ 4,276	$ 4,587
Fifth Avenue and Times Square JV | JV | 666 Fifth Avenue
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of real estate		$ 350,000
Square footage of real estate property (in sqft) | ft²		23,832
Net gain on sale of land		$ 76,162
Fifth Avenue and Times Square JV | JV | 666 Fifth Avenue, At Grade
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (in sqft) | ft²		7,416
Fifth Avenue and Times Square JV | JV | 1535 Broadway
Schedule of Equity Method Investments [Line Items]
Proceeds from financing	$ 450,000
Fifth Avenue and Times Square JV | JV | Percentage Through April 2029
Schedule of Equity Method Investments [Line Items]
Stated rate (as a percent)			4.75%
Fifth Avenue and Times Square JV | JV | Investors
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage			48.50%
Equity method effective ownership percentage			47.20%
Fifth Avenue and Times Square JV | JV | Vornado Realty Trust
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage			51.50%
Equity method effective ownership percentage			51.00%