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Related Party Transactions - Acquisitions and Commitments (Details)
$ in Thousands, ft² in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
shares
Aug. 10, 2022
USD ($)
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 ($)
ft²
agreement
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]                        
Interest income from sales-type leases [1]                   $ 264,250 $ 235,503 $ 202,258
Ground Lease acquisition purchase price                   183,630    
Future funding obligation, amount                   150,300    
Maximum                        
Related Party Transaction [Line Items]                        
Discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease                   9,000    
Land and Related Ground Lease                        
Related Party Transaction [Line Items]                        
Leasehold improvement allowance, funded amount                   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]                        
Purchase price of property under purchase option agreement                 $ 215,000      
Number of square feet | ft²                 1.1      
Proceeds from sale of acquisition right under purchase option agreement         $ 300              
Office space development property | Other expense                        
Related Party Transaction [Line Items]                        
Loss on sale of acquisition right under purchase option agreement         $ 1,900              
Caret Units                        
Related Party Transaction [Line Items]                        
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director           1            
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            
Period in which the entity is obligated to provide a public market listing           2 years            
Proceeds from stock transaction           $ 19,000            
Caret Units | MSD Partners                        
Related Party Transaction [Line Items]                        
Number of units sold | shares 100,000                      
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                    
Proceeds from stock transaction $ 20,000                      
Existing third-party Caret unit                        
Related Party Transaction [Line Items]                        
Number of units sold | shares 22,500                      
Proceeds from stock transaction $ 4,500                      
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 that expired | agreement     1                  
iStar Inc. | Land and Related Ground Lease                        
Related Party Transaction [Line Items]                        
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          
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 agreements entered into to acquire land and related Ground Lease | agreement                 2      
iStar Inc. | Land and Related Ground Lease | Maximum                        
Related Party Transaction [Line Items]                        
Real Estate, Leasehold Improvement Allowance                 $ 83,000      
iStar Inc. | Office space development property                        
Related Party Transaction [Line Items]                        
Payment to acquire purchase option agreement                 $ 1,200      
Washington, DC | Land and Related Ground Lease                        
Related Party Transaction [Line Items]                        
Interest income from sales-type leases                   6,700    
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    
iStar Inc.                        
Related Party Transaction [Line Items]                        
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 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                    
Safehold, Inc. (Old SAFE) | Caret Units                        
Related Party Transaction [Line Items]                        
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director           1            
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            
Period in which the entity is obligated to provide a public market listing           2 years            
[1] For the year ended December 31, 2022, the Company recorded $2.1 million of “Interest income from sales-type leases” in its consolidated statements of operations from Ground Leases with iStar Inc. (“iStar”).