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Related Party Transactions - Acquisitions and Commitments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | Jan. 31, 2024 USD ($) lease | Feb. 28, 2022 USD ($) director shares | Sep. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) director | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Write-off of investment in preferred equity |  |  |  |  |  |  | $ 1,945 |  |
Interest income from sales-type leases |  |  |  | $ 72,429 |  | $ 67,120 | 212,735 | $ 195,573 |
Ground Lease acquisition purchase price |  |  |  |  |  |  | 103,303 | $ 137,490 |
Future funding obligation, amount |  |  |  | 35,000 |  |  | 35,000 |  |
Land and Related Ground Lease |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Future funding obligation, amount |  |  |  | 51,800 |  |  | 51,800 |  |
Leasehold improvement allowance, funded amount |  |  |  | 51,800 |  |  | 51,800 |  |
Ground Lease Plus Fund |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of Ground Leases acquired | lease |  | 1 |  |  |  |  |  |  |
Ground Lease acquisition purchase price |  | $ 38,300 |  |  |  |  |  |  |
Caret Units |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of former independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director |  |  | 1 |  |  |  |  |  |
Number of units sold | shares |  |  | 108,571 |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  |  | 28,571 |  |  |  |  |  |
Expected proceeds from sale of shares under purchase commitment |  |  | $ 5,000 |  |  |  |  |  |
Period in which the entity is obligated to provide a public market listing |  |  | 2 years |  |  |  |  |  |
Proceeds from stock transaction |  |  | $ 19,000 |  |  |  |  |  |
Related party | Ground Lease Plus Fund | Land and Related Ground Lease |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Purchase price per agreement for acquisition of land and related Ground Lease, subject to certain conditions being met |  |  |  | $ 42,000 |  |  | $ 42,000 |  |
Multiple required by seller that may trigger payment of additional consideration |  |  |  | 1.25 |  |  | 1.25 |  |
Percentage of required seller return on investment that may trigger payment of additional consideration |  |  |  |  |  |  | 9.00% |  |
Related party | Ground Lease Plus Fund | Land and Related Ground Lease | Maximum |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Real Estate, Leasehold Improvement Allowance |  |  |  | $ 83,000 |  |  | $ 83,000 |  |
iStar Inc. | Land and Related Ground Lease |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of former independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction | director |  |  |  |  |  |  | 1 |  |
Preferred equity investment |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Funded amount of discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease |  |  |  |  | $ 1,500 |  |  |  |
Costs incurred to create entity formed to own leasehold interest in Ground Lease | $ 400 |  |  |  |  |  |  |  |
Preferred equity investment | Maximum |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease | $ 9,000 |  |  |  |  |  |  |  |
Preferred equity investment | Other expense |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Write-off of investment in preferred equity |  |  |  |  | $ 1,900 |  |  |  |
Preferred equity investment | Land and Related Ground Lease |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest income from sales-type leases |  |  |  |  |  |  | $ 5,200 |  |
Deferred expenses and other assets | Preferred equity investment |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Preferred equity investment |  |  |  |  |  |  |  |  | $ 1,900
Safehold, Inc. (Old SAFE) | Caret Units |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of former independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director |  |  | 1 |  |  |  |  |  |
Number of units sold | shares |  |  | 108,571 |  |  |  |  |  |
Percentage of authorized shares sold |  |  | 1.08% |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  |  | 28,571 |  |  |  |  |  |
Percentage of authorized shares under commitment to be purchased |  |  | 0.29% |  |  |  |  |  |
Expected proceeds from sale of shares under purchase commitment |  |  | $ 5,000 |  |  |  |  |  |
Period in which the entity is obligated to provide a public market listing |  |  | 2 years |  |  |  |  |  |

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