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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) - USD ($)
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Oct. 29, 2021
Oct. 28, 2021
Sponsored REITs        
Amount Drawn     $ 24,000,000 $ 21,000,000
Related party mortgage loan receivable     24,000,000 $ 21,000,000
Sponsored REITs        
Sponsored REITs        
Interest income and fees from the Sponsored REIT Loans $ 0 $ 906,000    
FSP Monument Circle LLC        
Sponsored REITs        
Additional loan amount     $ 3,000,000.0