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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards - Variable Interest Entities (Details) $ in Thousands | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Variable interest entity |  |  |  |  |
Gain on consolidation of Sponsored REIT | $ 394 |  |  |  |
Cash, cash equivalents and restricted cash | 13,043 |  | $ 6,632 | $ 8,717 | $ 40,751
VIE at Consolidation |  |  |  |  |
Real estate assets | 921,581 |  | 1,103,248 |  |
Acquired real estate leases | 7,447 |  | 10,186 |  |
Related party mortgage loan receivable |  |  | $ 19,763 |  |
Debt Securities, Available-for-Sale, Valuation Technique [Extensible Enumeration] |  |  | us-gaap:ValuationTechniqueDiscountedCashFlowMember |  |
Level 3 |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Related party mortgage loan receivable |  |  | $ 19,763 |  |
Level 3 | Exit Cap Rate | Maximum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  |  | 7.50 |  |
Level 3 | Exit Cap Rate | Minimum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  |  | 7.50 |  |
Level 3 | Exit Cap Rate | Weighted Average |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  |  | 7.50 |  |
Level 3 | Discount Rate | Maximum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  |  | 9.50 |  |
Level 3 | Discount Rate | Minimum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  |  | 9.50 |  |
Level 3 | Discount Rate | Weighted Average |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  |  | 9.50 |  |
Variable interest entities ("VIEs") |  |  |  |  |
Variable interest entity |  |  |  |  |
Gain on consolidation of Sponsored REIT | 400 |  |  |  |
Cash, cash equivalents and restricted cash | 2,445 |  | $ 0 |  |
VIE at Consolidation |  |  |  |  |
Real estate assets | 19,439 | $ 19,695 | 0 |  |
Acquired real estate leases | 305 | 305 | 305 |  |
Total |  | 20,000 |  |  |
Variable interest entities ("VIEs") | FSP Monument Circle LLC |  |  |  |  |
Variable interest entity |  |  |  |  |
Cash, cash equivalents and restricted cash | $ 3,000 |  |  |  |
Variable interest entities ("VIEs") | Level 3 |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Related party mortgage loan receivable |  | $ 20,000 |  |  |
Debt Securities, Available-for-Sale, Valuation Technique [Extensible Enumeration] |  | us-gaap:ValuationTechniqueDiscountedCashFlowMember |  |  |
Variable interest entities ("VIEs") | Level 3 | Exit Cap Rate | Maximum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  | 7.50 |  |  |
Variable interest entities ("VIEs") | Level 3 | Exit Cap Rate | Minimum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  | 7.50 |  |  |
Variable interest entities ("VIEs") | Level 3 | Exit Cap Rate | Weighted Average |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  | 7.50 |  |  |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Maximum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  | 9.50 |  |  |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Minimum |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  | 9.50 |  |  |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Weighted Average |  |  |  |  |
VIE at Consolidation |  |  |  |  |
Measurement input |  | 9.50 |  |  |
VIE, Not Primary Beneficiary |  |  |  |  |
Variable interest entity |  |  |  |  |
Maximum exposure to losses associated with VIE |  |  | 22,100 |  |
VIE, Not Primary Beneficiary | Prepaid expenses and other assets |  |  |  |  |
Variable interest entity |  |  |  |  |
Accrued interest and exit fee receivables |  |  | $ 2,300 |  |

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