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Debt (Narrative) (Details) ft² in Thousands, $ in Thousands									6 Months Ended
	Jun. 01, 2026 USD ($)	Mar. 10, 2026 USD ($)	Feb. 09, 2026 USD ($) ft²	Feb. 08, 2026 USD ($)	Feb. 04, 2026 USD ($)	Jan. 14, 2026 USD ($)	Jan. 07, 2026 USD ($) credit_facility	Jan. 06, 2026 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 10, 2025 USD ($)
Debt Instrument
Number of revolving credit facilities | credit_facility							2
Repayments of long-term debt									$ 1,415,569	$ 1,278,232
Long term debt									$ 2,599,970		$ 2,264,959
Mortgages payable
Debt Instrument
Weighted average interest rate									5.14%
Mortgages payable | 350 Park Avenue | Kenneth C. Griffin (KG)
Debt Instrument
Debt amount		$ 400,000
Revolving Credit Facility, 2031
Debt Instrument
Debt amount							$ 1,105,000
Maximum borrowing capacity					$ 1,130,000
Basis spread on variable rate					1.01%
Facility fee (as a percent)					0.24%
Unsecured Revolving Credit Facility, Maturing December 2027
Debt Instrument
Maximum borrowing capacity					$ 1,250,000
Revolving Credit Facility Maturing April 2029
Debt Instrument
Maximum borrowing capacity							$ 1,000,000	$ 915,000
Basis spread on variable rate							1.16%
Facility fee (as a percent)							0.24%
Unsecured term loan
Debt Instrument
Debt amount							$ 850,000	$ 800,000
Basis spread on variable rate							1.15%	1.25%
Senior Unsecured Notes Due 2033 | Unsecured term loan
Debt Instrument
Debt amount						$ 500,000
Stated rate (in percent)						5.75%
Face amount, percent						99.824%
Weighted average interest rate						5.78%
Proceeds from debt						$ 494,000
Repayments of long-term debt						$ 400,000
One Park Avenue mortgage loan | Mortgages payable
Debt Instrument
Basis spread on variable rate			1.78%
One Park Avenue Mortgage Loan due March 2026 | Mortgages payable
Debt Instrument
Basis spread on variable rate				1.22%
350 Park Avenue | Kenneth C. Griffin (KG)
Debt Instrument
Long term debt		$ 400,000
Senior Unsecured Notes Due 2026 | Unsecured term loan
Debt Instrument
Stated rate (in percent)	2.15%
Repaid of loan	$ 400,000
One Park Avenue
Debt Instrument
Loan balance			$ 525,000	$ 525,000
Square footage of real estate property (in sqft) | ft²			945
350 Park Avenue | Kenneth C. Griffin (KG)
Debt Instrument
Basis spread on variable rate		4.00%
Net rent per annum		$ 16,000
Office | 888 Seventh Avenue
Debt Instrument
Debt amount												$ 244,543
Office | One Park Avenue
Debt Instrument
Debt term			5 years

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