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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