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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards- Management fees and interest income from loans (Details) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Oct. 29, 2021
Oct. 28, 2021
Sponsored REITs        
Asset management fees, low end of range (as a percent) 1.00%      
Asset management fees, high end of range (as a percent) 5.00%      
Notice period for cancellation of applicable contracts 30 days      
Type of revenue us-gaap:AssetManagement1Member us-gaap:AssetManagement1Member    
Interest income and fees from the Sponsored REIT Loans $ 0 $ 0    
Related party mortgage loan receivable     $ 24,000,000 $ 21,000,000
Related party | FSP Monument Circle LLC        
Sponsored REITs        
Additional loan amount     $ 3,000,000