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Related Party Transactions - Star Holdings (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 30 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2025 | Mar. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2025 | 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 |  |  | $ 2.7 | $ 3.7 | $ 9.0 | $ 13.6 |  |  | $ 45.2 |
Star Holdings | Safehold Inc. |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 18.80% |  | 18.80% |  |  |  | 18.80% |
Star Holdings | SpinCo Manager | Affiliated entity |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Management fees |  |  |  |  |  |  | $ 15.0 | $ 25.0 |  |
Annual management fee - Year 3 | $ 10.0 |  |  |  |  |  |  |  |  |
Annual management fee - Year 4 | $ 7.5 | $ 5.0 |  |  |  |  |  |  |  |
Annual management fee percent of gross book value, year five and thereafter | 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 | $ 55.0 | $ 50.0 |  |  |  |  |  |  |  |
Termination fee due to liquidation of consolidated assets after third anniversary of agreement |  | 0.0 |  |  |  |  |  |  |  |
Termination fee due to reduction in consolidated assets - Year 3 |  | $ 5.0 |  |  |  |  |  |  |  |

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