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Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Variable interest entity
Gain on consolidation of Sponsored REIT		$ 394,000
Cash, cash equivalents and restricted cash		127,880,000	$ 42,683,000			$ 6,632,000	$ 40,751,000
VIE at Consolidation
Real estate assets		890,824,000	834,908,000
Acquired real estate leases		6,694,000	4,205,000
FSP Monument Circle LLC
Variable interest entity
Cash, cash equivalents and restricted cash		2,167,000	1,314,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable interest entity
Gain on consolidation of Sponsored REIT	$ 400,000
Cash, cash equivalents and restricted cash		2,167,000	1,314,000
VIE at Consolidation
Real estate assets		19,354,000	19,013,000	$ 19,695,000
Acquired real estate leases		$ 305,000	67,000	305,000
Total				$ 20,000,000
Variable Interest Entity, Primary Beneficiary [Member] | FSP Monument Circle LLC
Variable interest entity
Cash, cash equivalents and restricted cash			$ 3,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Level 3
VIE at Consolidation
Related party mortgage loan receivable					$ 20,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 | Exit Cap Rate | Maximum
VIE at Consolidation
Measurement input					0.075
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 | Exit Cap Rate | Minimum
VIE at Consolidation
Measurement input					0.075
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 | Exit Cap Rate | Weighted Average
VIE at Consolidation
Measurement input					0.075
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 | Discount Rate | Maximum
VIE at Consolidation
Measurement input					0.095
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 | Discount Rate | Minimum
VIE at Consolidation
Measurement input					0.095
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 | Discount Rate | Weighted Average
VIE at Consolidation
Measurement input					0.095
VIE, Not Primary Beneficiary
Variable interest entity
Maximum exposure to losses associated with VIE						22,100,000
VIE, Not Primary Beneficiary | Prepaid expenses and other assets
Variable interest entity
Accrued interest and exit fee receivables						$ 2,300,000

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