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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