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Related Party Transactions (Details) $ / shares in Units, $ in Thousands, ft² in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 10, 2022 USD ($) shares | Jun. 30, 2024 agreement | Jan. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Feb. 28, 2022 USD ($) director shares | Jan. 31, 2022 director | Nov. 30, 2021 USD ($) director | Jun. 30, 2021 USD ($) ft² agreement | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,199
Ground Lease acquisition purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 137,490 | 170,194
Interest income from sales-type leases |  |  |  |  |  |  |  |  | $ 67,120 | $ 59,130 |  | 195,573 | 174,350
Future funding obligation, amount |  |  |  |  |  |  |  |  | 150,300 |  |  | 150,300 |
Redemption of redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  | 18,435 |
Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Leasehold improvement allowance, funded amount |  |  |  |  |  |  |  |  | 51,800 |  |  | 51,800 |
Ground Lease Plus Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ground Lease acquisition purchase price |  |  | $ 38,300 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Purchase price of property under purchase option agreement |  |  |  |  |  |  |  | $ 215,000 |  |  |  |  |
Office space development property | Other expense |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale of acquisition right under purchase option agreement |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease |  |  |  |  |  |  |  |  |  |  |  | 9,000 |
Caret Units |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units sold | shares |  |  |  |  | 108,571 |  |  |  |  |  |  |  |
Proceeds from stock transaction |  |  |  |  | $ 19,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 shares to be sold under purchase commitment related to merger | shares | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from sale of shares under purchase commitment | $ 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Existing third-party Caret unit |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  |  |  |  |  |  |  |  |  |  | 22,500 |  |
Expected proceeds from sale of shares under purchase commitment |  |  |  |  |  |  |  |  |  |  | $ 4,500 |  |
Affiliated entity | iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee paid with common stock, period of restriction from selling stock |  |  |  |  |  |  |  |  |  |  | 2 years |  |
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% |  |
Termination fee, percent of prior years management fee |  |  |  |  |  |  |  |  |  |  | 3.00% |  |
Incentive fee |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Payment to acquire purchase option agreement |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |
Affiliated entity | iStar Inc. | General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee expense |  |  |  |  |  |  |  |  |  |  |  |  | 5,200
Reimbursed operating and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 3,100
Affiliated entity | 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 |  |  |  |  |
Number of agreements entered into to acquire land and related Ground Lease that expired | agreement |  | 1 |  |  |  |  |  |  |  |  |  |  |
Purchase price per agreement for acquisition of land and related Ground Lease, subject to certain conditions being met |  |  |  |  |  |  | $ 33,300 | $ 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 |  |  |  |  |  |  | 12.00% | 9.00% |  |  |  |  |
Future funding obligation, amount |  |  |  |  |  |  | $ 51,800 |  |  |  |  |  |
Affiliated entity | Minimum | iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee, shareholders' equity, incremental threshold amount two |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |
Management fee, shareholders' equity, incremental threshold amount three |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Management fee, shareholders' equity, incremental threshold amount four |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Affiliated entity | Maximum | iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee, shareholders' equity, incremental threshold amount one |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |
Management fee, shareholders' equity, incremental threshold amount two |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Management fee, shareholders' equity, incremental threshold amount three |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Affiliated entity | Maximum | iStar Inc. | Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate, leasehold improvement allowance |  |  |  |  |  |  |  | $ 83,000 |  |  |  |  |
Affiliated entity | IPO | iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 20.00 |  |
iStar Inc. | Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction | director |  |  |  |  |  | 1 | 1 |  |  |  |  |  |
Washington, DC | Land and Related Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income from sales-type leases |  |  |  |  |  |  |  |  | 1,700 |  |  | 2,700 |
Ground Lease Receivables |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income from sales-type leases |  |  |  |  |  |  |  |  | 23,585 | $ 19,339 |  | 66,971 | $ 55,934
Deferred expenses and other assets |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Funded amount of discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease |  |  |  |  |  |  |  |  | $ 1,500 |  |  | $ 1,500 |
iStar Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years as active real estate investor |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Number of agreements entered into to acquire land and related Ground Lease | agreement |  |  |  |  |  |  |  | 2 |  |  |  |  |
iStar Inc. | MSD Partners |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares | 5,405,406 |  |  |  |  |  |  |  |  |  | 5,405,406 |  |
Expected proceeds from sale of shares under purchase commitment | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
MSD Partners | Caret Units |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |

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