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Equity Investments in Ground Leases (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Jan. 31, 2022 USD ($) lease | Dec. 31, 2021 USD ($) | Jun. 30, 2021 agreement | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) | Feb. 28, 2022 USD ($) | Nov. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value | [1] |  |  |  |  | $ 310,320 | $ 180,388 |  |  |  |
Earnings from equity method investments |  |  |  |  |  | 24,229 | 9,055 | $ 6,279 |  |  |
Ground lease acquisition purchase price |  |  |  |  |  | 225,840 |  |  |  |  |
Ground Lease Plus Fund | Subsequent Events |  |  |  |  |  |  |  |  |  |  |
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
Gain (loss) from sale of Ground Lease |  |  |  | $ 0 |  |  |  |  |  |  |
Number of agreements entered into to acquire land and related Ground Lease | agreement |  |  |  |  | 2 |  |  |  |  |  |
iStar Inc. | Ground Lease Plus Fund |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of Ground Lease |  |  | $ 500 |  |  |  |  |  |  |  |
Number of Ground Leases sold | lease |  |  | 2 |  |  |  |  |  |  |  |
425 Park Avenue |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | 135,288 | 133,118 |  |  |  |
Earnings from equity method investments |  |  |  |  |  | $ 3,536 | 3,403 | 3,348 |  |  |
Ownership percentage |  |  |  |  |  | 54.80% |  |  |  |  |
32 Old Slip |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 52,425 | 47,270 |  |  |  |
Earnings from equity method investments |  |  |  |  |  | 5,670 | $ 5,652 | $ 2,931 |  |  |
Ownership percentage |  |  |  |  | 29.20% |  |  |  |  |  |
Ground Lease Plus Fund |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | 73,428 |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  | 5,415 |  |  |  |  |
Basis difference in equity investment to be amortized |  |  |  |  |  | 19,400 |  |  |  |  |
Amortization of basis difference in equity investments |  |  |  |  |  | $ 2,400 |  |  |  |  |
Weighted average remaining term |  |  |  |  |  | 105 years |  |  |  |  |
Ownership percentage |  |  |  |  |  | 53.00% |  |  |  |  |
Leasehold Loan Fund |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 49,179 |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  | 9,608 |  |  |  |  |
Basis difference in equity investment to be amortized |  |  |  |  |  | 11,200 |  |  |  |  |
Amortization of basis difference in equity investments |  |  |  |  |  | $ 3,000 |  |  |  |  |
Weighted average remaining term |  |  |  |  |  | 3 years 1 month 6 days |  |  |  |  |
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 |  |  |  |  |  | $ 40,300 |  |  |  |  |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities ("VIEs").

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