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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 08, 2024
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]      
Outstanding borrowings   $ 90,000 $ 145,000
Total principal   2,336,550  
Deferred financing costs, net   (18,295) (18,617)
Revolving Credit Facility      
Debt Instrument [Line Items]      
Basis spread on variable rate (as percent) 0.10%    
Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Total   621,400  
Mortgages, Senior Notes, and Unsecured Term Loan Facilities, not Including Unsecured Revolving Credit Facility      
Debt Instrument [Line Items]      
Total principal   2,336,550 2,389,011
Deferred financing costs, net   (12,070) (11,878)
Unamortized debt discount   (5,207) (5,402)
Total   2,319,273 2,371,731
1542 Third Avenue | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 30,000 30,000
Stated rate (as percent)   4.29%  
Effective Rate (as percent)   4.53%  
1010 Third Avenue and 77 West 55th Street | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 32,860 33,102
Stated rate (as percent)   4.01%  
Effective Rate (as percent)   4.21%  
250 West 57th Street | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 180,000 180,000
Stated rate (as percent)   2.83%  
Effective Rate (as percent)   3.21%  
1333 Broadway | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 160,000 160,000
Stated rate (as percent)   4.21%  
Effective Rate (as percent)   4.29%  
10 Union Square East | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 53,500 50,000
Stated rate (as percent)   5.33%  
Effective Rate (as percent)   5.59%  
Interest rate, excluding derivative (as percent)   5.59%  
345 East 94th Street - Series A | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 43,600 43,600
Variable rate (as percent)   70.00%  
Basis spread on variable rate (as percent)   0.95%  
Effective Rate (as percent)   3.56%  
345 East 94th Street - Series B | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 5,496 5,704
Basis spread on variable rate (as percent)   2.24%  
Effective Rate (as percent)   3.56%  
561 10th Avenue - Series A | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 114,500 114,500
Variable rate (as percent)   70.00%  
Basis spread on variable rate (as percent)   1.07%  
Effective Rate (as percent)   3.85%  
561 10th Avenue - Series B | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 11,594 12,105
Basis spread on variable rate (as percent)   2.45%  
Effective Rate (as percent)   3.85%  
Total mortgage debt | Fixed rate mortgage debt:      
Debt Instrument [Line Items]      
Fixed rate mortgage debt:   $ 631,550 629,011
Series B | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   4.09%  
Effective Rate (as percent)   4.12%  
Total   $ 125,000 125,000
Series C | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   4.18%  
Effective Rate (as percent)   4.21%  
Total   $ 125,000 125,000
Series D | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   4.08%  
Effective Rate (as percent)   4.11%  
Total   $ 115,000 115,000
Series E | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   4.26%  
Effective Rate (as percent)   4.27%  
Total   $ 160,000 160,000
Series F | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   4.44%  
Effective Rate (as percent)   4.45%  
Total   $ 175,000 175,000
Series G | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   3.61%  
Effective Rate (as percent)   4.89%  
Total   $ 100,000 100,000
Series H | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   3.73%  
Effective Rate (as percent)   5.00%  
Total   $ 75,000 75,000
Series I | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   7.20%  
Effective Rate (as percent)   7.39%  
Total   $ 155,000 155,000
Series J | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   7.32%  
Effective Rate (as percent)   7.46%  
Total   $ 45,000 45,000
Series K | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   7.41%  
Effective Rate (as percent)   7.52%  
Total   $ 25,000 25,000
Series L | Senior unsecured notes      
Debt Instrument [Line Items]      
Stated rate (as percent)   5.47%  
Effective Rate (as percent)   5.70%  
Total   $ 175,000 175,000
Unsecured term loan facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Stated rate (as percent)   1.60%  
Effective Rate (as percent)   4.56%  
Outstanding borrowings   $ 245,000 245,000
Unsecured term loan facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Stated rate (as percent)   1.60%  
Basis spread on variable rate (as percent) 1.50%    
Effective Rate (as percent)   5.26%  
Outstanding borrowings   $ 95,000 95,000
Unsecured revolving credit facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Stated rate (as percent)   1.40%  
Effective Rate (as percent)   5.01%  
Outstanding borrowings   $ 90,000 $ 145,000