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Equity Investments in Ground Leases (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2024
Dec. 31, 2021
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 31, 2025
Jul. 31, 2025
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]     $ 272,890   $ 272,890       $ 250,034          
Earnings (losses) from equity method investments     4,654 $ 4,739 14,558 $ 18,120                
Ground Lease acquisition purchase price         103,303 137,490                
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     139,197   139,197       137,348          
Earnings (losses) from equity method investments     $ 907 654 $ 2,679 2,389                
Ownership percentage     54.80%   54.80%                  
32 Old Slip                            
Schedule of Equity Method Investments [Line Items]                            
Carrying value     $ 66,864   $ 66,864       57,574          
Earnings (losses) from equity method investments     993 1,401 3,747 4,243                
Ownership percentage                           29.20%
Ground Lease Plus Fund                            
Schedule of Equity Method Investments [Line Items]                            
Carrying value     30,826   30,826       30,103          
Earnings (losses) from equity method investments     487 497 1,301 1,839                
Basis difference in equity investment to be amortized     19,700   19,700                  
Amortization of basis difference in equity investments     $ (100) (100) $ (200) 100                
Weighted average remaining term         104 years 9 months 18 days                  
Ownership percentage     53.20%   53.20%                  
Leasehold Loan Fund                            
Schedule of Equity Method Investments [Line Items]                            
Carrying value     $ 36,003   $ 36,003       $ 25,009          
Earnings (losses) from equity method investments     2,267 2,187 6,831 9,649                
Basis difference in equity investment to be amortized     4,100   4,100                  
Amortization of basis difference in equity investments     $ 1,000 $ 800 $ 2,400 $ 4,000                
Weighted average remaining term         8 months 12 days                  
Ownership percentage     53.20%   53.20%                  
Leasehold Loan Fund | Life science property                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to Ground lessee                       $ 130,000    
Loan commitment, reduced amount             $ 30,000              
Loan commitment to Ground lessee that has been funded     $ 15,500   $ 15,500                  
Leasehold Loan Fund | Mixed-use property                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to Ground lessee                     $ 105,000      
Loan commitment, reduced amount               $ 55,500            
Loan commitment to Ground lessee that has been funded     44,000   44,000                  
Leasehold Loan Fund | Student housing project                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to Ground lessee                   $ 31,500        
Loan commitment to Ground lessee that has been funded     $ 15,800   $ 15,800                  
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).