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Related Party Transactions - Excluded Properties and Businesses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) office_property interest property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Revenues | $	$ 739,572	$ 727,041	$ 624,094
Office Building
Related Party Transaction [Line Items]
Number of properties | office_property	11
Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties | office_property	9
Malkin Group | Mezzanine and Senior Equity Funds
Related Party Transaction [Line Items]
Number of interests owned | interest	1
Malkin Group | Residential Property Manager
Related Party Transaction [Line Items]
Number of properties	3
Number of interests owned | interest	3
Malkin Group | Multi-family Property | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	7
Malkin Group | Retail Site | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	5
Malkin Group | Retail Site | Manhattan
Related Party Transaction [Line Items]
Number of properties	2
Malkin Group | Retail Site | Westport, Connecticut | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street, Westport, Connecticut
Related Party Transaction [Line Items]
Number of properties	2
Malkin Group | Former Post Office | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	1
Malkin Group | Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties	1
Affiliated Entity | Supervisory fee revenue
Related Party Transaction [Line Items]
Revenues | $	$ 900	1,000	1,000
Affiliated Entity | Property management fee revenue
Related Party Transaction [Line Items]
Revenues | $	$ 300	$ 300	$ 200

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