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Related Party Transactions and Investments in Non-Consolidated Entities (Details 3) (USD $)			9 Months Ended		12 Months Ended	9 Months Ended	1 Months Ended			9 Months Ended				3 Months Ended	9 Months Ended		4 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Acquisition Loan Y	Sep. 30, 2011 Acquisition Loan FSP Union Centre Corp Loan	Dec. 31, 2010 Acquisition Loan FSP Monument Circle Corp. Loan	Sep. 30, 2011 Sponsored REIT Revolver Entity	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.	Sep. 30, 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.	Sep. 30, 2011 Sponsored REIT Revolver FSP Satellite Place Corp.	Jan. 02, 2011 Sponsored REIT Revolver FSP Satellite Place Corp.	Jun. 30, 2011 Sponsored REIT Revolver FSP 1441 Main Street Corp.	Sep. 30, 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.	Sep. 30, 2011 Sponsored REIT Revolver FSP 505 Waterford Corp.	Jan. 02, 2011 Sponsored REIT Revolver FSP 505 Waterford Corp.	Mar. 31, 2011 Sponsored REIT Revolver FSP Phoenix Tower Corp	Sep. 30, 2011 Sponsored REIT Revolver FSP Phoenix Tower Corp	Jan. 02, 2011 Sponsored REIT Revolver FSP Phoenix Tower Corp	Sep. 30, 2011 Construction loan Entity	Mar. 31, 2009 Construction loan FSP 385 Interlocken Development Corp.	Mar. 31, 2011 Construction loan FSP 385 Interlocken Development Corp.	Sep. 30, 2011 Construction loan FSP 385 Interlocken Development Corp.	Jan. 02, 2011 Construction loan FSP 385 Interlocken Development Corp.	Sep. 30, 2011 Sponsored REITs (no non-controlling preferred stock investment) Y	Sep. 30, 2010 Sponsored REITs (no non-controlling preferred stock investment)
Sponsored REITs
Term of loan (in years)			2
Number of loans outstanding				1	1
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
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										$ 5,500,000					$ 5,500,000			$ 10,800,000			$ 7,000,000			$ 15,000,000					$ 42,000,000		$ 85,800,000
Amount Drawn	61,916,000	57,684,000								1,125,000					5,500,000			7,300,000			1,150,000			9,300,000					37,541,000		61,916,000
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%
Draw Fee (as a percent)										0.50%					0.50%			0.50%			0.50%			0.50%							0.50%
Interest rate (as a percent)										4.62%					4.62%			4.62%			4.62%			4.62%					4.62%
Commitment fee paid by borrower at loan origination																											210,000
Interest income and fees from the Acquisition Loan and Sponsored REIT Loans																															$ 2,280,000	$ 1,122,000

X

- Definition

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

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

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

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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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Number of loans provided under the mortgage loan facility.

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

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

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Commitment 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)

-Number 210

-Section 04

-Paragraph 1

-Article 9



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-Section S99

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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

-Topic 850

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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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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.

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