Debt - Long-Term Debt (Details) - USD ($)	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding borrowings	$ 0	$ 0
Total principal	2,263,489,000
Deferred financing costs, net	(15,631,000)	(16,720,000)
Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	898,489,000	900,630,000
Mortgages, senior notes, and unsecured term loan facilities, not including unsecured revolving credit facility
Debt Instrument [Line Items]
Total principal	2,263,489,000	2,265,630,000
Deferred financing costs, net	(11,182,000)	(11,748,000)
Unamortized debt discount	(7,550,000)	(7,745,000)
Total	2,244,757,000	2,246,137,000
Metro Center \| Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 81,973,000	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 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	$ 178,068,000	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
First Stamford Place - Second Lien \| Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated Rate (as a percent)	6.25%
Face amount	$ 14,100,000
1010 Third Avenue and 77 West 55th Street \| Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 35,616,000	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 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 \| LIBOR
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 \| LIBOR
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	$ 7,707,000	7,865,000
Effective Rate (as a percent)	3.56%
561 10th Avenue - Series A \| Revolving credit facility \| LIBOR
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 \| LIBOR
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	$ 17,025,000	17,415,000
Effective Rate (as a percent)	3.85%
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 facilities \| Revolving credit facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 215,000,000	215,000,000
Effective Rate (as a percent)	4.22%
Unsecured term loan facilities \| Revolving credit facility \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.20%
Unsecured revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 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 facilities \| 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 facilities \| Revolving credit facility \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.50%

Debt Instrument, Variable Rate, Effective Percentage

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount (premium).

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

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