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Equity Investments in Ground Leases (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 agreement | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2022 USD ($) | Feb. 28, 2022 USD ($) | Jan. 31, 2022 lease | Nov. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | [1] |  |  |  | $ 243,302 |  | $ 243,302 |  |  | $ 310,320 |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  |  | 6,469 | $ 6,807 | 13,381 | $ 9,069 |  |  |  |  |  |  |
Ground lease acquisition purchase price |  |  |  |  |  |  | 110,206 | 97,948 |  |  |  |  |  |  |
Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasehold improvement allowance, funded amount |  | $ 36,500 |  |  | 49,300 |  | 49,300 |  |  |  |  |  |  |  |
Ground Lease Plus Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ground lease acquisition purchase price |  | $ 38,300 |  |  |  |  |  |  |  |  |  |  |  |  |
iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of land acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,300 |
Number of agreements entered into to acquire land and related Ground Lease | agreement |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
iStar Inc. | Multi-family project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to provide loan to Ground lessee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000
iStar Inc. | Ground Lease Plus Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of Ground Lease |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Number of Ground Leases sold | lease |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
425 Park Avenue | Equity Method Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  | 136,447 |  | 136,447 |  |  | 135,288 |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  |  | $ 856 | 872 | $ 1,735 | 1,708 |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 54.80% |  | 54.80% |  |  |  |  |  |  |  |
32 Old Slip |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  | $ 55,003 |  | $ 55,003 |  |  | 52,425 |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  |  | 1,417 | 1,420 | 2,842 | 2,846 |  |  |  |  |  |  |
Ownership percentage |  |  |  | 29.20% |  |  |  |  |  |  |  |  |  |  |
Ground Lease Plus Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  | 29,901 |  | 29,901 |  |  | 73,428 |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  |  | 453 | 1,688 | 1,342 | 1,688 |  |  |  |  |  |  |
Basis difference in equity investment to be amortized |  |  |  |  | 19,300 |  | 19,300 |  |  |  |  |  |  |  |
Amortization of basis difference in equity investments |  |  |  |  | $ (100) | 800 | $ 100 | 800 |  |  |  |  |  |  |
Weighted average remaining term |  |  |  |  |  |  | 106 years 1 month 6 days |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 53.20% |  | 53.20% |  |  |  |  |  |  |  |
Leasehold Loan Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  | $ 21,951 |  | $ 21,951 |  |  | $ 49,179 |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  |  | 3,743 | 2,827 | 7,462 | 2,827 |  |  |  |  |  |  |
Basis difference in equity investment to be amortized |  |  |  |  | 8,100 |  | 8,100 |  |  |  |  |  |  |  |
Amortization of basis difference in equity investments |  |  |  |  | $ 2,200 | $ 1,000 | $ 3,200 | $ 1,000 |  |  |  |  |  |  |
Weighted average remaining term |  |  |  |  |  |  | 2 years 8 months 12 days |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 53.20% |  | 53.20% |  |  |  |  |  |  |  |
Leasehold Loan Fund | Life science property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to provide loan to Ground lessee |  |  |  |  |  |  |  |  |  |  |  | $ 130,000 |  |  |
Leasehold Loan Fund | Mixed-use property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to provide loan to Ground lessee |  |  |  |  |  |  |  |  |  |  | $ 105,000 |  |  |  |
Loan commitment to Ground lessee that has been funded |  |  |  |  | $ 40,800 |  | $ 40,800 |  |  |  |  |  |  |  |
Leasehold Loan Fund | Multi-family project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan commitment to Ground lessee that has been funded |  |  |  |  |  |  |  |  | $ 69,400 |  |  |  |  |  |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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