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v2.4.1.9

Commitments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments |  |  |
Rent expense | $ 407,000 us-gaap_OperatingLeasesRentExpenseNet | $ 412,000 us-gaap_OperatingLeasesRentExpenseNet | $ 403,000 us-gaap_OperatingLeasesRentExpenseNet
Maximum amount of loan | 111,300,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan |  |
Amount drawn and outstanding | 93,641,000 us-gaap_LoansAndLeasesReceivableRelatedParties | 99,746,000 us-gaap_LoansAndLeasesReceivableRelatedParties |
Office buildings and industrial properties |  |  |
Future minimum rental income: |  |  |
2015 | 173,180,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
2016 | 166,043,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
2017 | 145,095,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
2018 | 128,369,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
2019 | 98,342,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
Thereafter (2020-2026) | 182,131,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
Total | 893,160,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable / us-gaap_MajorPropertyClassAxis = fsp_OfficeBuildingsAndIndustrialPropertiesMember |  |
Office buildings and industrial properties | Minimum |  |  |
Commitments |  |  |
Lease term | 1 year |  |
Corporate office space |  |  |
Commitments |  |  |
Lease term | 7 years |  |
Extension period | 5 years |  |
Future minimum lease payments: |  |  |
2015 | 424,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_MajorPropertyClassAxis = fsp_CorporateOfficeSpaceMember |  |
2016 | 428,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_MajorPropertyClassAxis = fsp_CorporateOfficeSpaceMember |  |
2017 | 324,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_MajorPropertyClassAxis = fsp_CorporateOfficeSpaceMember |  |
Total | $ 1,176,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_MajorPropertyClassAxis = fsp_CorporateOfficeSpaceMember |  |

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- Definition Reflects the maximum amount of loan due from related parties at the balance sheet date. + References No definition available. + Details
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Future minimum rental payments in aggregate as of the balance sheet date under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within one year of the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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