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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Sponsored REITs (no non-controlling preferred stock investment)
Jun. 30, 2011
Sponsored REITs (no non-controlling preferred stock investment)
Jun. 30, 2012
Acquisition Loan
Y
Dec. 31, 2011
Acquisition Loan
FSP Union Centre Corp
loan
Jun. 30, 2012
Secured revolving lines of credit
note
Y
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.
Jun. 30, 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.
Jun. 30, 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.
Jun. 30, 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.
Jun. 30, 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.
Jun. 30, 2012
Secured revolving lines of credit
FSP Phoenix Tower Corp.
Mar. 30, 2011
Secured revolving lines of credit
FSP Phoenix Tower Corp.
Jan. 02, 2011
Secured revolving lines of credit
FSP Phoenix Tower Corp.
Jun. 30, 2012
Secured revolving lines of credit
FSP Gallieria North Corp.
Mar. 30, 2011
Secured revolving lines of credit
FSP 385 Interlocken Development Corp.
Jun. 30, 2012
Secured construction loan
note
Mar. 31, 2009
Secured construction loan
FSP 385 Interlocken Development Corp.
Mar. 30, 2011
Secured construction loan
FSP 385 Interlocken Development Corp.
Jun. 30, 2012
Secured construction loan
FSP 385 Interlocken Development Corp.
Jan. 02, 2011
Secured construction loan
FSP 385 Interlocken Development Corp.
Mar. 31, 2012
Mortgage loan secured by property
FSP 50 South Tenth Street Corp.
Dec. 31, 2011
Mortgage loan secured by property
FSP 50 South Tenth Street Corp.
Jun. 30, 2012
Mortgage loan secured by property
FSP 50 South Tenth Street Corp.
Sponsored REITs                                                                        
Number of sponsored REITs to which loans have been provided             6                                                          
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                                                            
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 207,000,000                   5,500,000       5,500,000     10,800,000     7,000,000     15,000,000     15,000,000         42,000,000       106,200,000
Amount Drawn 177,536,000 140,516,000                 1,125,000       5,500,000     7,500,000     2,350,000     15,000,000     2,320,000         37,541,000       106,200,000
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        
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% 4.40% 3.00% 3.00% 5.00% 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)                     4.64%       4.64%     4.64%     4.64%     4.64%     5.24%         4.64%       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  
Payment of loan fee related to fixed mortgage component                                                                   300,000    
Amount drawn from revolving line of credit component                                                                   30,000,000    
Repayment fee (as a percent)                                                                   0.49% 0.49%  
Interest income and fees from the Sponsored REIT Loans     $ 5,102,000 $ 1,494,000