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Disposition of Properties and Assets Held for Sale (Details) |  |  |  |  | 3 Months Ended |
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Jun. 06, 2025 USD ($) | Apr. 07, 2025 USD ($) | Oct. 23, 2024 USD ($) | Jan. 26, 2024 USD ($) property | Sep. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($)
Disposition of Properties and Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |
Real estate assets |  |  |  |  | $ 799,622,000 |  |  |  |  |  | $ 834,908,000
Variable interest entities ("VIEs") |  |  |  |  |  |  |  |  |  |  |
Disposition of Properties and Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |
Real estate assets |  |  |  |  | 0 |  |  |  |  |  | $ 19,013,000
Disposal group disposed of by sale | Property in Atlanta, Georgia |  |  |  |  |  |  |  |  |  |  |
Disposition of Properties and Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |
Increase in expected loss |  |  | $ 400,000 |  |  |  | $ 6,600,000 |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  | 27,200,000 |  |  |  |
Sale price |  |  |  |  |  |  | $ 34,000,000 |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  | $ 20,500,000 |
Loss on sale of property |  |  |  |  |  |  |  |  |  | 20,500,000 |
Expected sales price |  |  |  |  |  |  |  |  |  | 40,000,000 |
Asset held for sale |  |  |  |  |  |  |  |  |  | $ 39,000,000 |
Disposal group disposed of by sale | Property in Indianapolis | FSP Monument Circle LLC | Variable interest entities ("VIEs") |  |  |  |  |  |  |  |  |  |  |
Disposition of Properties and Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |
Sale price |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
Loss on sale of property | $ 12,900,000 |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  | $ 13,300,000 |  |  |  |  |
Impairment loss after sale adjustment |  |  |  |  | $ 400,000 |  |  |  |  |  |
Asset held for sale |  |  |  |  |  | 5,700,000 |  |  |  |  |
Real estate assets |  |  |  |  |  | $ 18,900,000 |  |  |  |  |
Disposal group disposed of by sale | Properties In Richardson, Texas |  |  |  |  |  |  |  |  |  |  |
Disposition of Properties and Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  | 1 |  |  |  |  |  |  |
Sale price |  |  |  | $ 35,000,000 |  |  |  |  |  |  |
Loss on sale of property |  |  |  | $ 2,100,000 |  |  |  |  |  |  |
Additional costs related to sale |  |  |  |  |  |  |  |  | $ 5,000 |  |
Asset held for sale | Property in Glen Allen, Virginia |  |  |  |  |  |  |  |  |  |  |
Disposition of Properties and Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  |  | $ 31,000,000 |  |  |
Impairment charge |  |  |  |  |  |  |  | 13,200,000 |  |  |
Asset held for sale |  |  |  |  |  |  |  | 28,600,000 |  |  |
Real estate assets |  |  |  |  |  |  |  | 38,000,000 |  |  |
Straight line rents receivable |  |  |  |  |  |  |  | 1,400,000 |  |  |
Deferred leasing commissions |  |  |  |  |  |  |  | $ 2,400,000 |  |  |

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- Definition Amount classified as real estate investment property, net, attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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- Definition Amount of increase (decrease) in expected gain (loss) on sale of property. Amount of increase (decrease) in expected gain (loss) on sale of property. Amount of increase (decrease) in expected gain (loss) on sale of property. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 942 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480095/942-10-S50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 942 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480035/942-10-S99-6 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-4 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-15 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A + Details
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- Definition The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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