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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards - Variable Interest Entities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Variable interest entity |  |  |  |  |
Cash, cash equivalents and restricted cash (amounts related to variable interest entities ("VIEs") |  | $ 31,575 | $ 42,683 | $ 42,375 | $ 127,880
Variable interest entities ("VIEs") |  |  |  |  |
Variable interest entity |  |  |  |  |
Gain on consolidation of Sponsored REIT | $ 400 |  |  |  |
Cash, cash equivalents and restricted cash (amounts related to variable interest entities ("VIEs") |  | $ 239 | $ 1,314 |  |
Variable interest entities ("VIEs") | FSP Monument Circle LLC |  |  |  |  |
Variable interest entity |  |  |  |  |
Cash, cash equivalents and restricted cash (amounts related to variable interest entities ("VIEs") | $ 3,000 |  |  |  |

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- Definition Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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