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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 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	$ 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

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Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing.

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