v3.26.1
Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
 6 Months Ended
May 28, 2025
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]        
Outstanding borrowings   $ 175,000   $ 145,000
Total principal   2,240,571    
Deferred financing costs, net   (15,379)   (18,617)
Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 0.10%      
Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Total   443,100    
Mortgages, Senior Notes, and Unsecured Term Loan Facilities, not Including Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Total principal   2,240,571   2,389,011
Deferred financing costs, net   (9,183)   (11,878)
Unamortized debt discount   (5,012)   (5,402)
Total   2,226,376   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 a percent)   4.29%    
Effective rate (as a percent)   4.53%    
1010 Third Avenue and 77 West 55th Street | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 32,615   33,102
Stated Rate (as a percent)   4.01%    
Effective rate (as a percent)   4.21%    
250 West 57th Street | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 0   180,000
Stated Rate (as a percent)   0.00%    
Effective rate (as a percent)   0.00%    
1333 Broadway | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 160,000   160,000
Stated Rate (as a percent)   4.21%    
Effective rate (as a percent)   4.29%    
10 Union Square East | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 53,500 $ 53,500 50,000
Stated Rate (as a percent)   5.33% 5.33%  
Effective rate (as a percent)   5.59%    
Debt instrument, interest rate, stated percentage, 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, effective percentage (as a percent)   70.00%    
Basis spread on variable rate (as a percent)   0.95%    
Effective rate (as a percent)   3.56%    
345 East 94th Street - Series B | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 5,284   5,704
Basis spread on variable rate (as a percent)   2.24%    
Effective rate (as a 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, effective percentage (as a percent)   70.00%    
Basis spread on variable rate (as a percent)   1.07%    
Effective rate (as a percent)   3.85%    
561 10th Avenue - Series B | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 11,072   12,105
Basis spread on variable rate (as a percent)   2.45%    
Effective rate (as a percent)   3.85%    
Total mortgage debt | Fixed rate mortgage debt:        
Debt Instrument [Line Items]        
Fixed rate mortgage debt:   $ 450,571   629,011
Senior unsecured notes due 2027 (Series B) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 125,000   125,000
Stated Rate (as a percent)   4.09%    
Effective rate (as a percent)   4.12%    
Senior unsecured notes due 2028 (Series D) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 115,000   115,000
Stated Rate (as a percent)   4.08%    
Effective rate (as a percent)   4.11%    
Senior unsecured notes due 2029 (Series I) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 155,000   155,000
Stated Rate (as a percent)   7.20%    
Effective rate (as a percent)   7.39%    
Senior unsecured notes due 2030 (Series E) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 160,000   160,000
Stated Rate (as a percent)   4.26%    
Effective rate (as a percent)   4.27%    
Senior unsecured notes due 2030 (Series C) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 125,000   125,000
Stated Rate (as a percent)   4.18%    
Effective rate (as a percent)   4.21%    
Senior unsecured notes due 2031 (Series L) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 175,000   175,000
Stated Rate (as a percent)   5.47%    
Effective rate (as a percent)   5.70%    
Senior unsecured notes due 2031 (Series J) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 45,000   45,000
Stated Rate (as a percent)   7.32%    
Effective rate (as a percent)   7.46%    
Senior unsecured notes due 2032 (Series G) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 100,000   100,000
Stated Rate (as a percent)   3.61%    
Effective rate (as a percent)   4.89%    
Senior unsecured notes due 2033 (Series F) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 175,000   175,000
Stated Rate (as a percent)   4.44%    
Effective rate (as a percent)   4.45%    
Senior unsecured notes due 2034 (Series K) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 25,000   25,000
Stated Rate (as a percent)   7.41%    
Effective rate (as a percent)   7.52%    
Senior unsecured notes due 2035 (Series H) | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Total   $ 75,000   75,000
Stated Rate (as a percent)   3.73%    
Effective rate (as a percent)   5.00%    
Unsecured term loan facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 245,000   245,000
Basis spread on variable rate (as a percent)   1.60%    
Effective rate (as a percent)   4.56%    
Unsecured Term Loan Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 95,000   95,000
Basis spread on variable rate (as a percent) 1.50% 1.60%    
Effective rate (as a percent)   5.26%    
Unsecured revolving credit facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Outstanding borrowings   $ 175,000   $ 145,000
Basis spread on variable rate (as a percent) 1.30% 1.40%    
Effective rate (as a percent)   5.07%