Related Party Transactions - Excluded Properties and Businesses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) property office_property interest	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 28, 2023 property
Related Party Transaction [Line Items]
Revenues \| $	$ 768,270	$ 767,923	$ 739,572
Affiliated Entity \| Supervisory fee revenue
Related Party Transaction [Line Items]
Revenues \| $	1,200	800	900
Affiliated Entity \| Property management fee revenue
Related Party Transaction [Line Items]
Revenues \| $	$ 200	$ 300	$ 300
Multi-family Property \| Greenwich, Connecticut \| Malkin Group
Related Party Transaction [Line Items]
Number of properties	7
Retail Site \| Greenwich, Connecticut \| Malkin Group
Related Party Transaction [Line Items]
Number of properties	3
Retail Site \| Manhattan \| Malkin Group
Related Party Transaction [Line Items]
Number of properties	2
Retail Site \| Westport, Connecticut \| Malkin Group \| 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
Office Building
Related Party Transaction [Line Items]
Number of properties \| office_property	10
Office Building \| Manhattan \| Malkin Group
Related Party Transaction [Line Items]
Number of properties	1
Property Managers \| Malkin Group
Related Party Transaction [Line Items]
Number of properties	3
Number of interests owned \| interest	3