Exhibit 32.2


                CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the annual report on Form 10-K of Franklin Street Properties
Corp. (the "Company") for the period ended December 31, 2005 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), the
undersigned, John G. Demeritt, Chief Financial Officer of the Company, hereby
certifies, pursuant to 18 U.S.C. Section 1350, that:

            (1)   the Report fully complies with the requirements of Section
                  13(a) or 15(d) of the Securities Exchange Act of 1934; and

            (2)   the information contained in the Report fairly presents, in
                  all material respects, the financial condition and results of
                  operation of the Company.


Date: February 24, 2006                /s/ John G. Demeritt
                                       -----------------------
                                       John G. Demeritt
                                       Chief Financial Officer