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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% |  |  |  |

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