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Related Party Transactions - Excluded Properties and Businesses (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) property interest	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Feb. 28, 2023 property
Retail | Manhattan
Related Party Transaction [Line Items]
Number of properties	4
Retail | Westport, Connecticut
Related Party Transaction [Line Items]
Number of properties	2
Office Building
Related Party Transaction [Line Items]
Number of properties	12
Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties	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 | interest	5
Number of interests owned | interest	4
Malkin Group | Multi-family Property | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	8
Malkin Group | Retail | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	5
Malkin Group | Retail | Manhattan
Related Party Transaction [Line Items]
Number of properties	2
Malkin Group | Retail | Westport, Connecticut | Forecast | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street
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 | Third party management and other fees
Related Party Transaction [Line Items]
Revenue from related parties | $	$ 1.0	$ 1.0	$ 0.9
Affiliated Entity | Property management fee revenue | Third party management and other fees
Related Party Transaction [Line Items]
Revenue from related parties | $	$ 0.3	$ 0.2	$ 0.3

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