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Equity Investments in Ground Leases (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2024
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
agreement
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jul. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jan. 31, 2022
lease
Nov. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]                              
Carrying value [1]       $ 246,310,000   $ 246,310,000       $ 310,320,000          
Earnings (losses) from equity method investments       4,739,000 $ 7,451,000 18,120,000 $ 16,520,000                
Ground Lease acquisition purchase price           137,490,000 170,194,000                
Land and Related Ground Lease                              
Schedule of Equity Method Investments [Line Items]                              
Leasehold improvement allowance, funded amount       51,800,000   51,800,000                  
Ground Lease Plus Fund                              
Schedule of Equity Method Investments [Line Items]                              
Ground Lease acquisition purchase price $ 38,300,000                            
iStar Inc.                              
Schedule of Equity Method Investments [Line Items]                              
Value of land acquired                           $ 33,300,000  
Number of agreements entered into to acquire land and related Ground Lease | agreement     2                        
iStar Inc. | Multi-family project                              
Schedule of Equity Method Investments [Line Items]                              
Commitment to provide loan to Ground lessee                             $ 75,000,000.0
iStar Inc. | Ground Lease Plus Fund                              
Schedule of Equity Method Investments [Line Items]                              
Gain (loss) from sale of Ground Lease   $ 0                          
Number of Ground Leases sold | lease                         2    
425 Park Avenue | Equity Method Venture                              
Schedule of Equity Method Investments [Line Items]                              
Carrying value       136,806,000   136,806,000       135,288,000          
Earnings (losses) from equity method investments       $ 654,000 938,000 $ 2,389,000 2,645,000                
Ownership percentage       54.80%   54.80%                  
32 Old Slip                              
Schedule of Equity Method Investments [Line Items]                              
Carrying value       $ 56,293,000   $ 56,293,000       52,425,000          
Earnings (losses) from equity method investments       1,401,000 1,406,000 4,243,000 4,253,000                
Ownership percentage     29.20%                        
Ground Lease Plus Fund                              
Schedule of Equity Method Investments [Line Items]                              
Carrying value       30,030,000   30,030,000       73,428,000          
Earnings (losses) from equity method investments       497,000 1,825,000 1,839,000 3,513,000                
Basis difference in equity investment to be amortized       19,300,000   19,300,000                  
Amortization of basis difference in equity investments       $ (100,000) 800,000 $ 100,000 1,600,000                
Weighted average remaining term           105 years 9 months 18 days                  
Ownership percentage       53.20%   53.20%                  
Leasehold Loan Fund                              
Schedule of Equity Method Investments [Line Items]                              
Carrying value       $ 23,181,000   $ 23,181,000       $ 49,179,000          
Earnings (losses) from equity method investments       2,187,000 3,282,000 9,649,000 6,109,000                
Basis difference in equity investment to be amortized       7,200,000   7,200,000                  
Amortization of basis difference in equity investments       $ 800,000 $ 1,000,000.0 $ 4,000,000.0 $ 2,000,000.0                
Weighted average remaining term           2 years 6 months                  
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                       $ 130,000,000.0      
Leasehold Loan Fund | Mixed-use property                              
Schedule of Equity Method Investments [Line Items]                              
Commitment to provide loan to Ground lessee                     $ 105,000,000.0        
Loan commitment to Ground lessee that has been funded       $ 40,800,000   $ 40,800,000                  
Leasehold Loan Fund | Multi-family project                              
Schedule of Equity Method Investments [Line Items]                              
Loan commitment to Ground lessee that has been funded                 $ 69,400,000            
Leasehold Loan Fund | Student housing project                              
Schedule of Equity Method Investments [Line Items]                              
Commitment to provide loan to Ground lessee               $ 31,500,000              
Loan commitment to Ground lessee that has been funded       $ 0   $ 0                  
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).