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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards - Variable Interest Entities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jan. 01, 2023 USD ($) | Dec. 31, 2022 USD ($)
Variable interest entity |  |  |  |  |  |
Gain on consolidation of Sponsored REIT |  | $ 394 |  |  |  |
Cash, cash equivalents and restricted cash |  | $ 6,697 | $ 31,495 | $ 127,880 |  | $ 6,632
VIE at Consolidation |  |  |  |  |  |
Real estate assets |  |  | 840,756 | 890,824 |  |
Value of acquired real estate leases |  |  | 5,306 | 6,694 |  |
Variable interest entities ("VIEs") |  |  |  |  |  |
Variable interest entity |  |  |  |  |  |
Gain on consolidation of Sponsored REIT | $ 400 |  |  |  |  |
Cash, cash equivalents and restricted cash |  |  | 1,745 | 2,167 |  |
VIE at Consolidation |  |  |  |  |  |
Real estate assets |  |  | 19,184 | 19,354 | $ 19,695 |
Value of acquired real estate leases |  |  | $ 67 | $ 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 | Minimum |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |
Measurement input |  |  |  |  | 7.50 |
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 | Weighted Average |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |
Measurement input |  |  |  |  | 7.50 |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Minimum |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |
Measurement input |  |  |  |  | 9.50 |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Maximum |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |
Measurement input |  |  |  |  | 9.50 |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Weighted Average |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |
Measurement input |  |  |  |  | 9.50 |

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