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Related Party Transactions and Investments in Non-Consolidated Entities (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 12 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Sponsored REITs
Dec. 31, 2012
Acquisition Loan
Dec. 31, 2011
Acquisition Loan
FSP Union Centre Corp
item
Mar. 31, 2011
Secured revolving lines of credit
FSP High Land Place I Corp.
Feb. 28, 2011
Secured revolving lines of credit
FSP High Land Place I Corp.
Jan. 31, 2011
Secured revolving lines of credit
FSP High Land Place I Corp.
Dec. 31, 2012
Secured revolving lines of credit
FSP High Land Place I Corp.
Mar. 02, 2011
Secured revolving lines of credit
FSP High Land Place I Corp.
Feb. 02, 2011
Secured revolving lines of credit
FSP High Land Place I Corp.
Jan. 02, 2011
Secured revolving lines of credit
FSP High Land Place I Corp.
Mar. 31, 2011
Secured revolving lines of credit
FSP Satellite Place Corp.
Dec. 31, 2012
Secured revolving lines of credit
FSP Satellite Place Corp.
Mar. 30, 2011
Secured revolving lines of credit
FSP Satellite Place Corp.
Jan. 02, 2011
Secured revolving lines of credit
FSP Satellite Place Corp.
Mar. 31, 2011
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Dec. 31, 2012
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Mar. 30, 2011
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Jan. 02, 2011
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Mar. 31, 2011
Secured revolving lines of credit
FSP 505 Waterford Corp.
Dec. 31, 2012
Secured revolving lines of credit
FSP 505 Waterford Corp.
Mar. 30, 2011
Secured revolving lines of credit
FSP 505 Waterford Corp.
Jan. 02, 2011
Secured revolving lines of credit
FSP 505 Waterford Corp.
Dec. 31, 2012
Secured revolving lines of credit
FSP Galleria North Corp.
Mar. 31, 2011
Secured construction loan
FSP 385 Interlocken Development Corp.
Dec. 31, 2009
Secured construction loan
FSP 385 Interlocken Development Corp.
Dec. 31, 2012
Secured construction loan
FSP 385 Interlocken Development Corp.
Mar. 30, 2011
Secured construction loan
FSP 385 Interlocken Development Corp.
Jan. 02, 2011
Secured construction loan
FSP 385 Interlocken Development Corp.
Jul. 31, 2012
Mortgage loan secured by property
Mar. 31, 2012
Mortgage loan secured by property
Dec. 31, 2012
Mortgage loan secured by property
Dec. 31, 2011
Mortgage loan secured by property
Dec. 31, 2012
Mortgage loan secured by property
FSP Energy Tower Corp.
Jul. 05, 2012
Mortgage loan secured by property
FSP Energy Tower Corp.
Sponsored REITs                                                                          
Commitment fee paid by borrower at loan origination                                                       $ 210,000                  
Term of loan         2 years                                                                
Number of loans outstanding           1                                                              
Term of sponsored REIT loan secured by mortgage, minimum       2 years                                                                  
Term of sponsored REIT loan secured by mortgage, maximum       3 years                                                                  
Maximum amount of loan 118,800,000                 5,500,000         5,500,000       10,800,000       7,000,000     15,000,000     42,000,000             33,000,000  
Amount Drawn 93,896,000 140,516,000               1,125,000         5,500,000       8,500,000       2,350,000     5,880,000     37,541,000       30,000,000     33,000,000  
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                
Sponsored REIT loans, base rate margin (as a percent)                   4.40% 4.40% 3.00% 3.00%   4.40% 3.00% 3.00%   4.40% 3.00% 3.00%   4.40% 3.00% 3.00% 5.00%     4.40% 3.00% 3.00%            
Fixed rate of interest (as a percent)                                                                       6.41%  
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%     5.22%     4.62%             6.41%  
Loan fee related to fixed mortgage component                                                               301,000 300,000   762,000    
Exit fees (as a percent)                                                                       0.982%  
Payment of loan fee related to fixed mortgage component                                                                         300,630
Payment of loan fee related to fixed mortgage component                                                               520,000          
Amount drawn from revolving line of credit component                                                                 30,000,000        
Repayment fee (as a percent)                                                               0.49%   0.98%      
Interest income and fees from the Sponsored REIT Loans $ 9,798,000 $ 3,087,000 $ 1,609,000