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Related Party Transactions (Details 4) (USD $)			12 Months Ended								1 Months Ended			12 Months Ended				3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Sponsored REITs (no non-controlling preferred stock investment)	Dec. 31, 2010 Sponsored REITs (no non-controlling preferred stock investment)	Dec. 31, 2009 Sponsored REITs (no non-controlling preferred stock investment)	Dec. 31, 2011 Acquisition Loan Y	Dec. 31, 2011 Acquisition Loan FSP Union Centre Corp loan	Dec. 31, 2010 Acquisition Loan FSP Monument Circle Corp. loan	Dec. 31, 2009 Acquisition Loan FSP Centre Point V Corp. loan	Dec. 31, 2011 Sponsored REIT Revolver note Y	Mar. 31, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Feb. 28, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Jan. 31, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Dec. 31, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Mar. 02, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Feb. 02, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Jan. 02, 2011 Sponsored REIT Revolver FSP High Land Place I Corp.	Mar. 31, 2011 Sponsored REIT Revolver FSP Satellite Place Corp.	Dec. 31, 2011 Sponsored REIT Revolver FSP Satellite Place Corp.	Jan. 02, 2011 Sponsored REIT Revolver FSP Satellite Place Corp.	Mar. 31, 2011 Sponsored REIT Revolver FSP 1441 Main Street Corp.	Dec. 31, 2011 Sponsored REIT Revolver FSP 1441 Main Street Corp.	Jan. 02, 2011 Sponsored REIT Revolver FSP 1441 Main Street Corp.	Mar. 31, 2011 Sponsored REIT Revolver FSP 505 Waterford Corp.	Dec. 31, 2011 Sponsored REIT Revolver FSP 505 Waterford Corp.	Jan. 02, 2011 Sponsored REIT Revolver FSP 505 Waterford Corp.	Mar. 31, 2011 Sponsored REIT Revolver Phoenix Tower	Dec. 31, 2011 Sponsored REIT Revolver Phoenix Tower	Jan. 02, 2011 Sponsored REIT Revolver Phoenix Tower	Dec. 31, 2011 Construction loan note	Mar. 31, 2009 Construction loan FSP 385 Interlocken Development Corp.	Mar. 30, 2011 Construction loan FSP 385 Interlocken Development Corp.	Dec. 31, 2011 Construction loan FSP 385 Interlocken Development Corp.	Jan. 02, 2011 Construction loan FSP 385 Interlocken Development Corp.	Dec. 31, 2011 Mortgage loan FSP 50 South Tenth Street Corp.
Sponsored REITs
Number of sponsored REITs to which loans have been provided										5
Number of wholly-owned subsidiaries of the sponsored REITs to whom loan has been provided																														1
Commitment fee paid by borrower at loan origination																															$ 210,000
Term of loan (in years)						2
Number of loans outstanding							1	1	1
Term of sponsored REIT loan secured by mortgage, minimum (in years)										2
Term of sponsored REIT loan secured by mortgage, maximum (in years)										3
Maximum amount of loan	192,000,000													5,500,000					5,500,000			10,800,000			7,000,000			15,000,000					42,000,000		106,200,000
Amount Drawn	140,516,000	57,684,000												1,125,000					5,500,000			7,500,000			1,650,000			11,000,000					37,541,000		76,200,000
Sponsored REIT loans, base rate			30-day LIBOR								30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR				30-day LIBOR	30-day LIBOR		30-day LIBOR	30-day LIBOR		30-day LIBOR	30-day LIBOR		30-day LIBOR	30-day LIBOR				30-day LIBOR	30-day LIBOR
Sponsored REIT loans, base rate margin (as a percent)														4.40%	4.40%	3.00%	3.00%		4.40%	3.00%		4.40%	3.00%		4.40%	3.00%		4.40%	3.00%				4.40%	3.00%
Fixed rate of interest (as a percent)																																			6.51%
Draw Fee (as a percent)			0.50%										0.50%	0.50%					0.50%			0.50%			0.50%			0.50%							1.00%
Interest rate (as a percent)														4.67%					4.67%			4.67%			4.67%			4.67%					4.67%		6.51%
Fixed mortgage amount																																			76,200,000
Revolving line of credit component																																			30,000,000
Loan fee related to fixed mortgage component																																			762,000
Repayment fee (as a percent)																																			0.49%
Interest income and fees from the Sponsored REIT Loans			$ 3,087,000	$ 1,609,000	$ 838,000

X

- Definition

Reflects the maximum amount of fixed mortgage loan due from related parties at the balance sheet date.

+ References

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- Definition

Reflects the maximum amount of loan due from related parties at the balance sheet date.

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- Definition

Reflects the maximum amount of revolving line of credit component of loan due from related parties at the balance sheet date.

+ References

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- Definition

Represents the percentage of draw fee of each new advance given.

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No definition available.

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- Definition

Represents the percentage of fixed rate of interest on the loans receivable.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of fee charged on all amounts repaid under the loan.

+ References

No definition available.

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X

- Definition

Stated maximum period for maturity of the mortgage loan receivable on real estate.

+ References

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- Definition

Stated minimum period for maturity of the mortgage loan receivable on real estate.

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Term of mortgage loan represented in number of years.

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- Definition

Number of loans provided under the mortgage loan facility.

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- Definition

Represents the number of sponsored REITs of the entity to which loans have been provided.

+ References

No definition available.

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- Definition

Represents the number of wholly-owned subsidiaries of the sponsored REITs of the entity to whom loan has been provided.

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No definition available.

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The interest rate of the mortgage loan receivable at the end of the period.

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No definition available.

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Commitment fees received on mortgage loans during the reporting period.

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Loan fees received on mortgage loans during the reporting period.

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- Definition

Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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-Section 04

-Paragraph 1

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Article 9

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- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

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The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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