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Related Party Transactions - Excluded Properties and Businesses (Details) $ in Thousands | 12 Months Ended
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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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