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Related Party Transactions - Star Holdings (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Sep. 30, 2024 | Apr. 30, 2023
Selling stockholder sales agreement | Maximum |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Aggregate number of shares |  |  |  |  |  |  |  |  | 1,000,000
Star Holdings | Affiliated entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Management fees recorded |  | $ 3.7 | $ 6.0 |  | $ 13.6 | $ 13.2 |  | $ 33.0 |
Star Holdings | Safehold Inc. |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 18.90% |  |  | 18.90% |  |  | 18.90% |
Star Holdings | Spinco Manager | Affiliated entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Annual management fee paid in Year 1 |  |  |  |  |  |  | $ 25.0 |  |
Annual management fee - Year 2 | $ 15.0 |  |  | $ 15.0 |  |  |  |  |
Annual management fee - Year 3 | 10.0 |  |  | 10.0 |  |  |  |  |
Annual management fee - Year 4 | $ 5.0 |  |  | $ 5.0 |  |  |  |  |
Annual management fee percent of gross book value, year five and thereafter | 2.00% |  |  | 2.00% |  |  |  |  |
Management agreement initial term | 1 year |  |  |  |  |  |  |  |
Management agreement renewal term | 1 year |  |  |  |  |  |  |  |
Notice required to terminate management agreement without cause | 180 days |  |  |  |  |  |  |  |
Percentage approval of independent directors to terminate management agreement without cause | 66.70% |  |  |  |  |  |  |  |
Notice required to terminate management agreement with cause | 30 days |  |  |  |  |  |  |  |
Termination fee, termination without cause | $ 50.0 |  |  | $ 50.0 |  |  |  |  |
Termination fee due to liquidation of consolidated assets after third anniversary of agreement | 0.0 |  |  | 0.0 |  |  |  |  |
Termination fee due to reduction in consolidated assets - Year 1 | 30.0 |  |  | 30.0 |  |  |  |  |
Termination fee due to reduction in consolidated assets - Year 2 | 15.0 |  |  | 15.0 |  |  |  |  |
Termination fee due to reduction in consolidated assets - Year 3 | $ 5.0 |  |  | $ 5.0 |  |  |  |  |

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