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Related Party Transactions (Narrative) (Details)
$ / shares in Units, $ in Thousands, ft² in Millions
 1 Months Ended 3 Months Ended
Aug. 10, 2022
USD ($)
shares
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
director
Apr. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
lease
property
director
Feb. 28, 2022
USD ($)
director
shares
Nov. 30, 2021
USD ($)
director
Jun. 30, 2021
USD ($)
ft²
director
agreement
Mar. 31, 2023
USD ($)
employee
$ / shares
shares
Mar. 31, 2022
USD ($)
lease
property
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%  
Management fee expense                 $ 5,199 $ 4,457
Termination fee, percent of prior years management fee                 3.00%  
Ground lease acquisition                 $ 50,803 $ 216,765
Future funding obligation, amount                 319,600  
Number of new Ground Leases entered into | lease         3         3
General and Administrative Expense                    
Related Party Transaction [Line Items]                    
Management fee expense                 5,200 $ 4,500
Land                    
Related Party Transaction [Line Items]                    
Payments to acquire land         $ 28,500          
Manager | General and Administrative Expense | Incentive Fee                    
Related Party Transaction [Line Items]                    
Expenses from transactions with related party                 0  
Office space development property                    
Related Party Transaction [Line Items]                    
Number of square feet | ft²               1.1    
Purchase price of property under purchase option agreement               $ 215,000    
Mixed-use property                    
Related Party Transaction [Line Items]                    
Ground lease, additional construction, funding commitment     $ 35,000              
Minimum                    
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  
Maximum                    
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  
IPO                    
Related Party Transaction [Line Items]                    
Share price (in dollars per share) | $ / shares                 $ 20.00  
Caret Units                    
Related Party Transaction [Line Items]                    
Number of units sold | shares           108,571        
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, L.P. [Member]                    
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  
iStar Inc.                    
Related Party Transaction [Line Items]                    
Ground lease acquisition   $ 36,400   $ 9,000            
Payment to acquire purchase option agreement               $ 1,200    
Payments to acquire land         $ 122,000          
Number of land properties acquired | property         3         3
Payment to terminate a real estate purchase option         $ 300          
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 $ 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      
Number of independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction | director             1 1    
iStar Inc. | Maximum | Land and Related Ground Lease                    
Related Party Transaction [Line Items]                    
Real estate, leasehold improvement allowance               $ 83,000    
Director                    
Related Party Transaction [Line Items]                    
Number of directors with indirect ownership in Ground lease tenant. | director         1          
iStar Affiliate                    
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        
iStar Affiliate | Life Science Office Property Development                    
Related Party Transaction [Line Items]                    
Additional consideration paid           $ 9,000        
iStar Affiliate | Mixed-use property                    
Related Party Transaction [Line Items]                    
Additional consideration paid     $ 5,000              
iStar Shareholder Affiliate | Mixed-use property                    
Related Party Transaction [Line Items]                    
Number of directors affiliated with shareholder having indirect ownership in venture | director     1              
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. | General and Administrative Expense                    
Related Party Transaction [Line Items]                    
Expenses from transactions with related party                 $ 3,100 $ 3,100
iStar Inc. | MSD Partners, L.P. [Member]                    
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                  
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        
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        
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     $ 105,000              
MSD Partners, L.P. [Member] | 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