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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real estate investments, at cost:
Balance, beginning of year	$ 1,790,590us-gaap_RealEstateGrossAtCarryingValue	$ 1,323,384us-gaap_RealEstateGrossAtCarryingValue	$ 1,158,808us-gaap_RealEstateGrossAtCarryingValue
Acquisitions		454,445us-gaap_RealEstateOtherAcquisitions	167,812us-gaap_RealEstateOtherAcquisitions
Improvements	16,589us-gaap_RealEstateImprovements	20,768us-gaap_RealEstateImprovements	16,784us-gaap_RealEstateImprovements
Assets held for sale			(8,007)fsp_SECScheduleIIIRealEstateGrossAtCarryingValueReductionDueToAssetsHeldForSale
Dispositions	(16,588)us-gaap_RealEstateCostOfRealEstateSold	(8,007)us-gaap_RealEstateCostOfRealEstateSold	(20,020)us-gaap_RealEstateCostOfRealEstateSold
Balance-Real Estate	1,790,591us-gaap_RealEstateInvestments	1,790,590us-gaap_RealEstateInvestments	1,315,377us-gaap_RealEstateInvestments
Assets held for sale			8,007us-gaap_RealEstateHeldforsale
Balance, end of year	1,790,591us-gaap_RealEstateGrossAtCarryingValue	1,790,590us-gaap_RealEstateGrossAtCarryingValue	1,323,384us-gaap_RealEstateGrossAtCarryingValue
Accumulated depreciation:
Balance, beginning of year	222,252us-gaap_RealEstateAccumulatedDepreciation	180,756us-gaap_RealEstateAccumulatedDepreciation	152,587us-gaap_RealEstateAccumulatedDepreciation
Depreciation	48,982us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	41,763us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	33,563us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Assets held for sale			(167)fsp_SECScheduleIIIRealEstateAccumulatedDepreciationReductionDueToAssetsHeldForSale
Dispositions	(4,950)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold	(267)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold	(5,394)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Balance- Accumulated Depreciation	266,284fsp_SECScheduleIIIRealEstateInvestmentAccumulatedDepreciationOtherThanRealEstateHeldForSale	222,252fsp_SECScheduleIIIRealEstateInvestmentAccumulatedDepreciationOtherThanRealEstateHeldForSale	180,589fsp_SECScheduleIIIRealEstateInvestmentAccumulatedDepreciationOtherThanRealEstateHeldForSale
Assets held for sale			167fsp_SECScheduleIIIRealEstateAccumulatedDepreciationAssetsHeldForSale
Balance, end of year	$ 266,284us-gaap_RealEstateAccumulatedDepreciation	$ 222,252us-gaap_RealEstateAccumulatedDepreciation	$ 180,756us-gaap_RealEstateAccumulatedDepreciation

X

- Definition

Represents the amount of accumulated depreciation pertaining to real estate property that is held for sale.

+ References

No definition available.

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Represents reduction in real estate accumulated depreciation due to assets held for sale.

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Represents the reduction in real estate, gross, at carrying value due to assets held for sale.

+ References

No definition available.

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The amount as of the balance sheet date of accumulated depreciation pertaining to real estate properties other than real estate held for sale.

+ References

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Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of real estate investments, 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; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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