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Mortgages and Other Loans Payable - Schedule of Mortgages and Other Loans Payable (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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% |

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