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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) - USD ($)
15 Months Ended
Mar. 31, 2024
Oct. 29, 2021
Oct. 28, 2021
Sponsored REITs      
Interest income and fees from the Sponsored REIT Loans $ 0    
Related party mortgage loan receivable   $ 24,000,000 $ 21,000,000
FSP Monument Circle LLC      
Sponsored REITs      
Additional loan amount   $ 3,000,000.0