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Related Party Transactions - Excluded Properties and Businesses (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
property
office_property
interest
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 28, 2023
property
Related Party Transaction [Line Items]        
Revenues | $ $ 767,923 $ 739,572 $ 727,041  
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      
Affiliated Entity | Supervisory fee revenue        
Related Party Transaction [Line Items]        
Revenues | $ $ 800 900 1,000  
Affiliated Entity | Property management fee revenue        
Related Party Transaction [Line Items]        
Revenues | $ $ 300 $ 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 4      
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
Former Post Office | Greenwich, Connecticut | Malkin Group        
Related Party Transaction [Line Items]        
Number of properties 1      
Office Building        
Related Party Transaction [Line Items]        
Number of properties | office_property 10      
Office Building | Manhattan        
Related Party Transaction [Line Items]        
Number of properties | office_property 9      
Office Building | Manhattan | Malkin Group        
Related Party Transaction [Line Items]        
Number of properties 1