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Equity Investments in Ground Leases (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 31, 2024
Dec. 31, 2021
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Jul. 31, 2024
Jun. 30, 2022
Feb. 28, 2022
Nov. 30, 2021
Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]                    
Carrying value [1]     $ 245,958   $ 250,034          
Earnings (losses) from equity method investments     4,992 $ 6,912            
Ground Lease acquisition purchase price     13,972 32,158            
Land and Related Ground Lease                    
Schedule of Equity Method Investments [Line Items]                    
Leasehold improvement allowance, funded amount     51,800              
Ground Lease Plus Fund                    
Schedule of Equity Method Investments [Line Items]                    
Ground Lease acquisition purchase price $ 38,300                  
iStar Inc.                    
Schedule of Equity Method Investments [Line Items]                    
Value of land acquired                 $ 33,300  
iStar Inc. | Ground Lease Plus Fund                    
Schedule of Equity Method Investments [Line Items]                    
Gain (loss) from sale of Ground Lease   $ 0                
425 Park Avenue | Equity Method Venture                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value     137,958   137,348          
Earnings (losses) from equity method investments     $ 886 879            
Ownership percentage     54.80%              
32 Old Slip                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value     $ 58,879   57,574          
Earnings (losses) from equity method investments     1,430 1,425            
Ownership percentage                   29.20%
Ground Lease Plus Fund                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value     30,258   30,103          
Earnings (losses) from equity method investments     484 889            
Basis difference in equity investment to be amortized     19,500              
Amortization of basis difference in equity investments     $ (100) 200            
Weighted average remaining term     105 years 3 months 18 days              
Ownership percentage     53.20%              
Leasehold Loan Fund                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value     $ 18,863   $ 25,009          
Earnings (losses) from equity method investments     2,192 3,719            
Basis difference in equity investment to be amortized     5,800              
Amortization of basis difference in equity investments     $ 700 $ 1,000            
Weighted average remaining term     2 years              
Ownership percentage     53.20%              
Leasehold Loan Fund | Life science property                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to Ground lessee               $ 130,000    
Leasehold improvement allowance, funded amount     $ 4,700              
Leasehold Loan Fund | Mixed-use property                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to Ground lessee             $ 105,000      
Loan commitment to Ground lessee that has been funded     42,400              
Leasehold Loan Fund | Student housing project                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to Ground lessee           $ 31,500        
Leasehold improvement allowance, funded amount     $ 1,400              
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).