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Debt - Long-Term Debt (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 08, 2024
Mar. 31, 2024
Jun. 30, 2024
Apr. 10, 2024
Dec. 31, 2023
Debt Instrument [Line Items]          
Outstanding borrowings   $ 120,000,000     $ 0
Total principal   2,255,529,000      
Deferred financing costs, net   (20,072,000)     (12,365,000)
Revolving Credit Facility | SOFR          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 0.10%        
Senior unsecured notes | Subsequent Event          
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   2,255,529,000     2,256,998,000
Deferred financing costs, net   (9,834,000)     (9,488,000)
Unamortized debt discount   (6,769,000)     (6,964,000)
Total   2,238,926,000     2,240,546,000
Metro Center | Fixed rate mortgage debt          
Debt Instrument [Line Items]          
Fixed rate mortgage debt   $ 79,425,000     80,070,000
Stated rate (as a percent)   3.59%      
Effective Rate (as a percent)   3.67%      
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%      
First Stamford Place | Fixed rate mortgage debt          
Debt Instrument [Line Items]          
Fixed rate mortgage debt   $ 175,860,000     175,860,000
Stated rate (as a percent)   4.28%      
Effective Rate (as a percent)   4.73%      
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      
1010 Third Avenue and 77 West 55th Street | Fixed rate mortgage debt          
Debt Instrument [Line Items]          
Fixed rate mortgage debt   $ 34,734,000     34,958,000
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   $ 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 | SOFR          
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 | SOFR          
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   $ 7,035,000     7,209,000
Effective Rate (as a percent)   3.56%      
561 10th Avenue - Series A | Revolving Credit Facility | SOFR          
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 | SOFR          
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   $ 15,375,000     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   $ 890,529,000     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%      
Unsecured term loan facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Outstanding borrowings   $ 175,000,000     175,000,000
Effective Rate (as a percent)   4.51%      
Unsecured term loan facility | Revolving Credit Facility | SOFR          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent)   1.50%      
Unsecured term loan facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Outstanding borrowings   $ 95,000,000     215,000,000
Effective Rate (as a percent)   4.47%      
Unsecured term loan facility | Revolving Credit Facility | SOFR          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 1.50% 1.50%      
Unsecured revolving credit facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Outstanding borrowings   $ 120,000,000     $ 0
Effective Rate (as a percent)   4.03%      
Unsecured revolving credit facility | Revolving Credit Facility | SOFR          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent)   1.30%      
Series I Green Guaranteed Senior Notes due June 17, 2029 | Senior unsecured notes | Subsequent Event          
Debt Instrument [Line Items]          
Stated rate (as a percent)       7.20%  
Face amount       $ 155,000,000  
Maturing in July 2027 | Subsequent Event          
Debt Instrument [Line Items]          
Debt expected to eliminate     $ 175,900,000