XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Dispositions of Property (Details) |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 23, 2024 USD ($) | Jan. 26, 2024 USD ($) | Dec. 06, 2023 USD ($) | Oct. 26, 2023 USD ($) | Aug. 09, 2023 USD ($) property | Mar. 10, 2023 USD ($) property | Dec. 28, 2022 USD ($) | Aug. 31, 2022 USD ($) property | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) ft² | Sep. 30, 2023 USD ($) ft² | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 29, 2021 USD ($)
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset held for sale |  |  |  |  |  |  |  |  |  |  |  | $ 73,318,000 |  |  |  | $ 73,318,000 |  |
Real estate assets |  |  |  |  |  |  |  |  |  |  |  | 890,824,000 |  |  | $ 834,908,000 | 890,824,000 |  |
Straight-line rent receivable |  |  |  |  |  |  |  |  |  |  |  | 40,397,000 |  |  | 37,727,000 | 40,397,000 |  |
Deferred leasing commissions, net of accumulated amortization of $14,195 and $16,008, respectively |  |  |  |  |  |  |  |  |  |  |  | 23,664,000 |  |  | 22,941,000 | 23,664,000 |  |
Operating results for discontinued operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,319,000 | 29,837,000 | $ 45,762,000 |
Rental operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,988,000) | (9,773,000) | (14,684,000) |
Real estate taxes and insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (324,000) | (4,316,000) | (10,449,000) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (832,000) | (8,599,000) | (16,114,000) |
Income from dispositions and assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,175,000 | 7,149,000 | $ 4,515,000 |
FSP Monument Circle LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional loan amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Disposal group disposed of by sale | FSP Monument Circle LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional cost on sale of properties |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |
Disposal group disposed of by sale | Office properties in Broomfield, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  |  | $ 102,500,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  | $ 24,100,000 |  |  |  |  |  |  |  |  |  |
Disposal group disposed of by sale | Office Property in Evanston, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  | $ 27,800,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |
Disposal group disposed of by sale | Office Property in Elk Grove Village, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  | $ 29,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Disposal group disposed of by sale | Office property in Charlotte, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  | $ 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  | $ (800,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group disposed of by sale | Property in Addison, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,000 |  |  |  |  |
Area of property (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 7,826 | 7,826 |  |  |  |
Disposal group disposed of by sale | Property in Miami, Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  | $ 68,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  | $ (18,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group disposed of by sale | Property in Atlanta, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  |  |  | $ 34,000,000 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  | 27,200,000 |  |  |  |  |  |  |  |  |
Increase in expected loss | $ 400,000 |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |  |  |  |
Asset held for sale |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 | $ 40,000,000 | $ 40,000,000 |  | 39,000,000 |  |
Real estate assets |  |  |  |  |  |  |  |  |  |  |  | 52,200,000 |  |  |  | 52,200,000 |  |
Straight-line rent receivable |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  | 4,400,000 |  |
Deferred leasing commissions, net of accumulated amortization of $14,195 and $16,008, respectively |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  | 2,900,000 |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,500,000 |  |  |  |
Disposal group disposed of by sale | Properties in Miami, Florida and Atlanta, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset held for sale |  |  |  |  |  |  |  |  |  |  |  |  | 96,400,000 | 96,400,000 |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | 39,700,000 |  |  |  |  |
Disposal group disposed of by sale | Property in Plano, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  | $ 48,000,000 |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ 10,600,000 |  |  |  |  |  |  |  |  | 10,600,000 |  |  |  |  |
Asset held for sale |  |  |  |  |  |  |  |  |  |  |  |  | 36,200,000 | $ 36,200,000 |  |  |  |
Disposal group disposed of by sale | Properties In Richardson, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |
Asset held for sale |  |  |  |  |  |  |  |  |  |  |  | 34,400,000 |  |  |  | 34,400,000 |  |
Real estate assets |  |  |  |  |  |  |  |  |  |  |  | 31,100,000 |  |  |  | 31,100,000 |  |
Straight-line rent receivable |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 |  |  |  | 3,400,000 |  |
Deferred leasing commissions, net of accumulated amortization of $14,195 and $16,008, respectively |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  | $ 2,000,000 |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |
Disposal group disposed of by sale | Property in Glen Allen, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  |  |  |  | $ 31,000,000 |  |  |  |  |  |  |  |
Additional cost on sale of properties |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  | $ 13,200,000 |  |  |  |  |  |  |  |

X
- Definition Amount of additional cost incurred from the sale of property. + References No definition available. + Details
Name: | fsp_AdditionalCostFromSaleOfProperty
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of real estate taxes and insurance attributable to disposal group, but not limited to, discontinued operation. + References No definition available. + Details
Name: | fsp_DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | fsp_IncreaseDecreaseInExpectedGainLossOnSaleOfProperty
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the additional amount of loan due from related parties at the balance sheet date. + References No definition available. + Details
Name: | fsp_LoansAndLeasesReceivableRelatedPartiesAdditionalLoanAmount
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of office properties sold. + References No definition available. + Details
Name: | fsp_NumberOfPropertiesSold
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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://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
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 15 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482309/360-10-15-4 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481178/840-20-25-16 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 35 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481123/840-20-35-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479341/842-30-25-10 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481178/840-20-25-17 + Details
Name: | us-gaap_DeferredCostsLeasingNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of excess of rental income recognized over rental payment required by lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 35 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481123/840-20-35-2 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481178/840-20-25-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479341/842-30-25-11 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481178/840-20-25-2 + Details
Name: | us-gaap_DeferredRentReceivablesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147483475/205-20-45-3A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5C -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483475/205-20-45-3 + Details
Name: | us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_GainLossOnSaleOfProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 4: 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 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(14)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 3 -SubTopic 360 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477875/944-360-45-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 4 -SubTopic 360 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477875/944-360-45-4 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 360 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478586/944-360-50-1 + Details
Name: | us-gaap_GainsLossesOnSalesOfInvestmentRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ProceedsFromSaleOfPropertyHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_RealEstateInvestmentPropertyNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fsp_FspMonumentCircleLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_OfficePropertiesInBroomfieldColoradoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_OfficePropertyInEvanstonIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_OfficePropertyInElkGroveVillageIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_OfficePropertyInCharlotteNorthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_PropertyInAddisonTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_PropertyInMiamiFloridaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_OfficePropertiesInAtlantaGeorgiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_PropertiesInMiamiFloridaAndAtlantaGeorgiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_OfficePropertyInPlanoTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_PropertiesInRichardsonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=fsp_PropertyInGlenAllenVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |