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Debt - Schedule of Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Unsecured revolving credit facility | $ 0 | $ 0
Total principal | 2,256,998,000 |
Deferred financing costs, net | (12,365,000) | (16,720,000)
Mortgages, senior notes, and unsecured term loan facilities, not including unsecured revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total principal | 2,256,998,000 | 2,265,630,000
Deferred financing costs, net | (9,488,000) | (11,748,000)
Unamortized debt discount | (6,964,000) | (7,745,000)
Total | 2,240,546,000 | 2,246,137,000
Metro Center | Fixed rate mortgage debt |  |
Debt Instrument [Line Items] |  |
Fixed rate debt | $ 80,070,000 | 82,596,000
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 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 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 debt | $ 175,860,000 | 178,823,000
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 | $ 164,000,000.0 |
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 debt | $ 34,958,000 | 35,831,000
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 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 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 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 debt | $ 7,209,000 | 7,865,000
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 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 debt | $ 15,801,000 | 17,415,000
Effective rate (as a percent) | 3.85% |
Total fixed rate mortgage debt | Fixed rate mortgage debt |  |
Debt Instrument [Line Items] |  |
Fixed rate debt | $ 891,998,000 | 900,630,000
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 revolving credit facility | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Unsecured revolving credit facility | $ 0 | 0
Effective rate (as a percent) | 0.00% |
Unsecured revolving credit facility | Revolving Credit Facility | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.30% |
Unsecured term loan facility | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Unsecured revolving credit facility | $ 215,000,000 | 215,000,000
Effective rate (as a percent) | 4.22% |
Unsecured term loan facility | Revolving Credit Facility | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.20% |
Unsecured term loan facilities | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Unsecured revolving credit facility | $ 175,000,000 | $ 175,000,000
Effective rate (as a percent) | 4.51% |
Unsecured term loan facilities | Revolving Credit Facility | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.50% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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- Definition Line items represent financial concepts included in a table. 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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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