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Related Party Transactions and Investments in Non-Consolidated Entities (Details) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 entity | Sep. 22, 2006 | Sep. 30, 2006 | Sep. 30, 2013 | Jan. 04, 2013 | Dec. 31, 2013 entity | Dec. 31, 2012 entity | Dec. 20, 2012
Related Party Transactions and Investments in Non-Consolidated Entities |  |  |  |  |  |  |  |
Sponsored REITs (in entities) | 10 fsp_NumberOfSponsoredREITs |  |  |  |  | 14 fsp_NumberOfSponsoredREITs | 15 fsp_NumberOfSponsoredREITs |
Number of REITs in which the entity holds non-controlling preferred stock interest | 2 fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest |  |  |  |  |  |  |
Sponsored REIT |  |  |  |  |  |  |  |
Number of sponsored REITs having properties which were sold | 4 fsp_NumberOfSponsoredREITsHavingPropertiesWhichWereSold |  |  |  |  |  |  |
Number of entities holding mortgage loans | 2 fsp_NumberOfEntitiesHoldingMortgageLoans |  |  |  |  |  |  |
FSP 505 Waterford Corp. |  |  |  |  |  |  |  |
Sponsored REIT |  |  |  |  |  |  |  |
Principal amount of loan |  |  |  |  |  | 2,350,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSP505WaterfordCorpMember |  |
Phoenix Tower |  |  |  |  |  |  |  |
Sponsored REIT |  |  |  |  |  |  |  |
Preferred shares purchased |  | 48 fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember | 48 fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember |  |  |  |  |
Percentage of outstanding preferred shares purchased |  | 4.60%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember | 4.60%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember |  |  |  |  |
Beneficial interest | 18,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember |  |  |  |  |  |  | 4,866,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember
Phoenix Tower | Preferred shares ownership |  |  |  |  |  |  |  |
Sponsored REIT |  |  |  |  |  |  |  |
Amount received |  |  |  | 96,000 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember | 4,752,000 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember |  |  |
FSP Galleria North Corp. |  |  |  |  |  |  |  |
Sponsored REIT |  |  |  |  |  |  |  |
Repayment of principal | 13,880,000 us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPGalleriaNorthCorpMember |  |  |  |  |  |  |
FSP Highland Place I Corp. |  |  |  |  |  |  |  |
Sponsored REIT |  |  |  |  |  |  |  |
Repayment of principal | 3,395,000 us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPHighLandPlaceICorpMember |  |  |  |  |  |  |

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