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Disposition of Properties and Assets Held for Sale (Details)					3 Months Ended
	Jun. 06, 2025 USD ($)	Apr. 07, 2025 USD ($)	Oct. 23, 2024 USD ($)	Jan. 26, 2024 USD ($) property	Jun. 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					$ 803,412,000						$ 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

X

- Definition

The amount of final sales adjustments increased (decreased) to the selling price of the asset held for sale.

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Amount classified as deferred leasing costs net of accumulated amortization, attributable to disposal group held for sale or disposed of.

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Amount classified as real estate investment property, net, attributable to disposal group held for sale or disposed of.

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Amount classified as straight line rents receivable, attributable to disposal group held for sale or disposed of.

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- Definition

Expected sales price of a property.

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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.

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Represents the number of office properties sold.

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The cash outflow for the costs related to the sale of property held for sale.

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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.

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Amount of assets held-for-sale that are not part of a disposal group.

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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.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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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.

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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.

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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.

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