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Debt - Schedule of Debt (Details) - USD ($)
 9 Months Ended
Mar. 08, 2024
Sep. 30, 2024
Jul. 31, 2024
Apr. 30, 2024
Apr. 10, 2024
Dec. 31, 2023
Debt Instrument [Line Items]            
Outstanding borrowings   $ 120,000,000       $ 0
Total principal   2,295,624,000        
Deferred financing costs, net   (20,061,000)       (12,365,000)
Revolving Credit Facility            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent) 0.10%          
Senior Unsecured Notes            
Debt Instrument [Line Items]            
Face amount         $ 225,000,000  
Mortgages, Senior Notes, and Unsecured Term Loan Facilities, not Including Unsecured Revolving Credit Facility            
Debt Instrument [Line Items]            
Total principal   2,295,624,000       2,256,998,000
Deferred financing costs, net   (10,691,000)       (9,488,000)
Unamortized debt discount   (6,378,000)       (6,964,000)
Total   2,278,555,000       2,240,546,000
First Stamford Place | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 0       175,860,000
Stated rate (as a percent)   0.00%        
Effective Rate (as a percent)   0.00%        
First Stamford Place - First Lien | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Stated rate (as a percent)       4.09%    
Face amount       $ 164,000,000    
First Stamford Place - Second Lien | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Stated rate (as a percent)       6.25%    
Face amount       $ 11,900,000    
10 Union Square | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 50,000,000       50,000,000
Stated rate (as a percent)   3.70%        
Effective Rate (as a percent)   3.97%        
1542 Third Avenue | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 30,000,000       30,000,000
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:   $ 34,278,000       34,958,000
Stated rate (as a percent)   4.01%        
Effective Rate (as a percent)   4.21%        
Metro Center | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 72,078,000       80,070,000
Stated rate (as a percent)   3.59% 3.59%      
Effective Rate (as a percent)   3.67%        
Face amount     $ 71,600,000      
250 West 57th Street | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 180,000,000       180,000,000
Stated rate (as a percent)   2.83%        
Effective Rate (as a percent)   3.21%        
1333 Broadway | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 160,000,000       160,000,000
Stated rate (as a percent)   4.21%        
Effective Rate (as a percent)   4.29%        
345 East 94th Street - Series A | Revolving Credit Facility            
Debt Instrument [Line Items]            
Variable rate, effective percentage (as a percent)   70.00%        
Basis spread on variable rate (as a percent)   0.95%        
345 East 94th Street - Series A | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 43,600,000       43,600,000
Effective Rate (as a percent)   3.56%        
345 East 94th Street - Series B | Revolving Credit Facility            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)   2.24%        
345 East 94th Street - Series B | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 6,676,000       7,209,000
Effective Rate (as a percent)   3.56%        
561 10th Avenue - Series A | Revolving Credit Facility            
Debt Instrument [Line Items]            
Variable rate, effective percentage (as a percent)   70.00%        
Basis spread on variable rate (as a percent)   1.07%        
561 10th Avenue - Series A | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 114,500,000       114,500,000
Effective Rate (as a percent)   3.85%        
561 10th Avenue - Series B | Revolving Credit Facility            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)   2.45%        
561 10th Avenue - Series B | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 14,492,000       15,801,000
Effective Rate (as a percent)   3.85%        
Total mortgage debt | Fixed rate mortgage debt:            
Debt Instrument [Line Items]            
Fixed rate mortgage debt:   $ 705,624,000       891,998,000
Series A | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 100,000,000       100,000,000
Stated rate (as a percent)   3.93%        
Effective Rate (as a percent)   3.96%        
Series B | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 125,000,000       125,000,000
Stated rate (as a percent)   4.09%        
Effective Rate (as a percent)   4.12%        
Series C | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 125,000,000       125,000,000
Stated rate (as a percent)   4.18%        
Effective Rate (as a percent)   4.21%        
Series D | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 115,000,000       115,000,000
Stated rate (as a percent)   4.08%        
Effective Rate (as a percent)   4.11%        
Series E | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 160,000,000       160,000,000
Stated rate (as a percent)   4.26%        
Effective Rate (as a percent)   4.27%        
Series F | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 175,000,000       175,000,000
Stated rate (as a percent)   4.44%        
Effective Rate (as a percent)   4.45%        
Series G | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 100,000,000       100,000,000
Stated rate (as a percent)   3.61%        
Effective Rate (as a percent)   4.89%        
Series H | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 75,000,000       75,000,000
Stated rate (as a percent)   3.73%        
Effective Rate (as a percent)   5.00%        
Series I | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 155,000,000       0
Stated rate (as a percent)   7.20%     7.20%  
Effective Rate (as a percent)   7.39%        
Face amount         $ 155,000,000  
Series J | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 45,000,000       0
Stated rate (as a percent)   7.32%     7.32%  
Effective Rate (as a percent)   7.46%        
Face amount         $ 45,000,000  
Series K | Senior Unsecured Notes            
Debt Instrument [Line Items]            
Total   $ 25,000,000       0
Stated rate (as a percent)   7.41%     7.41%  
Effective Rate (as a percent)   7.52%        
Face amount         $ 25,000,000  
Unsecured Term Loan Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Outstanding borrowings   $ 175,000,000       175,000,000
Basis spread on variable rate (as a percent)   1.50%        
Effective Rate (as a percent)   4.61%        
Unsecured Term Loan Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Outstanding borrowings   $ 95,000,000       215,000,000
Basis spread on variable rate (as a percent) 1.50% 1.50%        
Effective Rate (as a percent)   4.48%        
Unsecured revolving credit facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Outstanding borrowings   $ 120,000,000       $ 0
Basis spread on variable rate (as a percent)   1.30%        
Effective Rate (as a percent)   4.04%