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Related Party Transactions (Details) $ / shares in Units, ft² in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) shares | Aug. 10, 2022 USD ($) shares | Jan. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jul. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) director | Apr. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) property director lease | Feb. 28, 2022 USD ($) director shares | Jan. 31, 2022 director | Nov. 30, 2021 USD ($) director | Jun. 30, 2021 USD ($) ft² agreement | Dec. 31, 2023 USD ($) employee $ / shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee paid with common stock, period of restriction from selling stock |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Management fee, transaction share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.00 |  |
Management fee, percent, threshold one |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Management fee, percent, threshold two |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |
Management fee, percent, threshold three |  |  |  |  |  |  |  |  |  |  |  |  | 1.375% |  |
Management fee, percent, threshold four |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |
Management fee expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,199,000 | $ 20,252,000 | $ 14,865,000
Termination fee, percent of prior years management fee |  |  |  |  |  |  |  |  |  |  |  |  | 300.00% |  |
Ground lease acquisition purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,840,000 |  |
Future funding obligation, amount |  |  |  |  |  |  |  |  |  |  |  |  | 283,100,000 |  |
Number of new Ground Leases entered into | lease |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire land |  |  |  |  |  |  |  | $ 28,500,000 |  |  |  |  |  |  |
Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasehold improvement allowance, funded amount |  |  |  |  |  |  |  |  |  |  |  |  | 23,700,000 |  |
Ground Lease Plus Fund | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ground lease acquisition purchase price |  |  | $ 38,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Manager | General and Administrative Expense | Management Fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  |  |  |  |  | 5,200,000 | 20,300,000 | 14,900,000
Manager | General and Administrative Expense | Incentive Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Office space development property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of square feet | ft² |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |
Proceeds from sale of acquisition right under purchase option agreement |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price of property under purchase option agreement |  |  |  |  |  |  |  |  |  |  |  | $ 215,000,000.0 |  |  |
Office space development property | Other expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale of acquisition right under purchase option agreement |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Mixed-use property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ground lease, additional construction, funding commitment |  |  |  |  |  | $ 35,000,000.0 |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee, shareholders' equity, incremental threshold amount two |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000,000 |  |
Management fee, shareholders' equity, incremental threshold amount three |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000.0 |  |
Management fee, shareholders' equity, incremental threshold amount four |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000,000.0 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee, shareholders' equity, incremental threshold amount one |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000,000 |  |
Management fee, shareholders' equity, incremental threshold amount two |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000.0 |  |
Management fee, shareholders' equity, incremental threshold amount three |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000,000.0 |  |
Caret Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units sold | shares |  |  |  |  |  |  |  |  | 108,571 |  |  |  |  |  |
Proceeds from stock transaction |  |  |  |  |  |  |  |  | $ 19,000,000.0 |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  |  |  |  |  |  |  |  | 28,571 |  |  |  |  |  |
Expected proceeds from sale of shares under purchase commitment |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Period in which the entity is obligated to provide a public market listing |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Caret Units | MSD Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units sold | shares | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock transaction | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from sale of shares under purchase commitment |  | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Existing third-party Caret unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units sold | shares | 22,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock transaction | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors affiliated with shareholder having indirect ownership in venture | director |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  |
Number of independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction | director |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ground lease acquisition purchase price |  |  |  |  | $ 36,400,000 |  | $ 9,000,000.0 |  |  |  |  |  |  |  |
Payments to acquire land |  |  |  |  |  |  |  | $ 122,000,000.0 |  |  |  |  |  |  |
Number of land properties acquired | property |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Payment to terminate a real estate purchase option |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |
iStar Inc. | Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements entered into to acquire land and related Ground Lease | agreement |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Purchase price per agreement for acquisition of land and related Ground Lease, subject to certain conditions being met |  |  |  |  |  |  |  |  |  |  | $ 33,300,000 | $ 42,000,000.0 |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 12.00% | 9.00% |  |  |
Future funding obligation, amount |  |  |  |  |  |  |  |  |  |  | $ 51,800,000 |  |  |  |
Number of directors affiliated with shareholder having indirect ownership in venture | director |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction | director |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
iStar Inc. | Office space development property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire purchase option agreement |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |
iStar Inc. | Maximum | Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate, leasehold improvement allowance |  |  |  |  |  |  |  |  |  |  |  | $ 83,000,000.0 |  |  |
iStar Affiliate | Life Science Office Property Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration paid |  |  |  |  |  |  |  |  | $ 9,000,000.0 |  |  |  |  |  |
Leasehold Loan Fund | Mixed-use property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan commitment received to fund a recapitalization project |  |  |  |  |  | $ 105,000,000.0 |  |  |  |  |  |  |  |  |
Additional consideration paid |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |
iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements entered into to acquire land and related Ground Lease | agreement |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
iStar Inc. | General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 | $ 12,500,000 | $ 7,500,000
iStar Inc. | MSD Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units sold | shares | 5,405,406 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  | 5,405,406 |  |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from sale of shares under purchase commitment |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
iStar Inc. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years as active real estate investor |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Ground Lease tenant | iStar Affiliate | Life Science Office Property Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan commitment received to fund a recapitalization project |  |  |  |  |  |  |  |  | $ 130,000,000.0 |  |  |  |  |  |
Safehold, Inc. (Old SAFE) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Safehold, Inc. (Old SAFE) | Caret Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Period in which the entity is obligated to provide a public market listing |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Venture in which iStar and an affiliate of an existing shareholder own noncontrolling interest | iStar Affiliate | Mixed-use property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan commitment received to fund a recapitalization project |  |  |  |  |  |  |  |  | $ 130,000,000.0 |  |  |  |  |  |

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