Mortgages and Other Loans Payable - Schedule of Mortgages and Other Loans Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,387,386	$ 3,165,814
Total floating rate debt	110,000	70,148
Total mortgages and other loans payable	1,497,386	3,235,962
Deferred financing costs, net of amortization	(6,067)	(8,399)
Total mortgages and other loans payable, net	1,491,319	3,227,563
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	277,238	283,064
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt	370,000	370,000
7 Dey/185 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	190,148	200,000
Total floating rate debt	0	10,148
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt	100,000	100,000
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	450,000	450,000
719 Seventh Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	50,000
Total floating rate debt	50,000	0
245 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	1,712,750
690 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt	$ 60,000	$ 60,000
Weighted Average | 420 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.99%
Weighted Average | 100 Church Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.89%
Weighted Average | 7 Dey/185 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.65%
Weighted Average | Landmark Square
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.90%
Weighted Average | 485 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.25%
Weighted Average | 719 Seventh Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.31%
Weighted Average | 690 Madison Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	0.50%