WAKEFIELD, MA -- (Marketwire) -- 07/08/10 -- Franklin Street Properties Corp. ("FSP" or "its") (NYSE Amex: FSP), an investment firm specializing in real estate, is providing the following updated information on the percentage of leased space in its directly-owned portfolio of 33 properties as of June 30, 2010.

                         FRANKLIN STREET PROPERTIES
                         Percentage of Leased Space

                                              %     First      %     Second
                                           Leased  Quarter  Leased  Quarter
                                            as of   Average as of    Average
                                   Square  3/31/10    %     6/30/10    %
   Property Name  Location          Feet      *    Leased**    *    Leased**
-- -------------- -------------- --------- ------- -------- ------- --------

-- -------------- -------------- --------- ------- -------- ------- --------
 1 PARK SENECA    Charlotte, NC   109,550   85.1%    85.2%   84.4%    84.8%
-- -------------- -------------- --------- ------- -------- ------- --------
   HILLVIEW
 2 CENTER         Milpitas, CA     36,288   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
 3 SOUTHFIELD     Southfield, MI  214,697   55.7%    55.6%   56.4%    55.9%
-- -------------- -------------- --------- ------- -------- ------- --------
 4 BOLLMAN PLACE  Savage, MD       98,745   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
 5 FOREST PARK    Charlotte, NC    62,212   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
                  Colorado
 6 CENTENNIAL     Springs, CO     110,730   78.5%    78.5%   78.5%    78.5%
-- -------------- -------------- --------- ------- -------- ------- --------
 7 MEADOW POINT   Chantilly, VA   138,538   51.5%    50.7%   80.6%    70.9%
-- -------------- -------------- --------- ------- -------- ------- --------
                  Chesterfield,
 8 TIMBERLAKE     MO              232,766   99.0%    99.0%   99.0%    99.0%
-- -------------- -------------- --------- ------- -------- ------- --------
                  Federal Way,
 9 FEDERAL WAY    WA              117,010   26.1%    26.1%   28.3%    26.9%
-- -------------- -------------- --------- ------- -------- ------- --------
   NORTHWEST      Elk Grove
10 POINT          Village, IL     176,848   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
   TIMBERLAKE     Chesterfield,
11 EAST           MO              116,197   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
12 PARK TEN       Houston, TX     155,715   66.0%    63.4%   49.8%    54.8%
-- -------------- -------------- --------- ------- -------- ------- --------
13 MONTAGUE       San Jose, CA    145,951   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
14 ADDISON        Addison, TX     293,787   61.3%    61.3%   92.7%    71.8%
-- -------------- -------------- --------- ------- -------- ------- --------
   COLLINS
15 CROSSING       Richardson, TX  298,766   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
   GREENWOOD
16 PLAZA          Englewood, CO   199,077   100.0%  100.0%   30.6%    53.7%
-- -------------- -------------- --------- ------- -------- ------- --------
                  Indianapolis,
17 RIVER CROSSING IN              205,059   94.7%    94.7%   94.7%    94.7%
-- -------------- -------------- --------- ------- -------- ------- --------
18 LIBERTY PLAZA  Addison, TX     218,934   77.8%    74.4%   78.0%    77.7%
-- -------------- -------------- --------- ------- -------- ------- --------
19 INNSBROOK      Glen Allen, VA  303,745   34.7%    25.4%   31.3%    31.3%
-- -------------- -------------- --------- ------- -------- ------- --------
   380
20 INTERLOCKEN    Broomfield, CO  240,184   87.0%    87.0%   89.7%    88.8%
-- -------------- -------------- --------- ------- -------- ------- --------
21 BLUE LAGOON    Miami, FLA      212,619   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
22 ELDRIDGE GREEN Houston, TX     248,399   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
23 WILLOW BEND    Plano, TX       116,622   49.8%    49.8%   49.8%    49.8%
-- -------------- -------------- --------- ------- -------- ------- --------
   ONE OVERTON
24 PARK           Atlanta, GA     387,267   90.3%    90.3%   91.5%    91.0%
-- -------------- -------------- --------- ------- -------- ------- --------
   390
25 INTERLOCKEN    Broomfield, CO  241,516   98.5%    98.5%   98.3%    98.3%
-- -------------- -------------- --------- ------- -------- ------- --------
26 EAST BALTIMORE Baltimore, MD   325,445   94.4%    94.7%   95.3%    95.3%
-- -------------- -------------- --------- ------- -------- ------- --------
   PARK TEN PHASE
27 II             Houston, TX     156,746   97.8%    97.8%   97.8%    97.8%
-- -------------- -------------- --------- ------- -------- ------- --------
   LAKESIDE       Maryland
28 CROSSING I     Heights, MO     127,778   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
29 LOUDOUN TECH   Dulles, VA      135,888   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
   4807
30 STONECROFT     Chantilly, VA   111,469   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
                  Eden Prairie,
31 EDEN BLUFF     MN              153,028   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
   3150 FAIRVIEW  Falls Church,
32 PARK DRIVE     VA              252,613   100.0%  100.0%   100.0%  100.0%
-- -------------- -------------- --------- ------- -------- ------- --------
   121 SOUTH
   EIGHTH STREET
    (Acq          Minneapolis,
33 06/29/10)      MN              474,646    n/a      n/a    89.8%    89.8%
-- -------------- -------------- --------- ------- -------- ------- --------
   TOTAL WEIGHTED
   AVERAGE                       6,418,835  85.4%    84.7%   85.3%    84.6%
-- -------------- -------------- --------- ------- -------- ------- --------

   * % Leased as of month's end includes all leases that expire on the last
   day of the quarter.
   ** Average quarterly percentage is the average of the end of the month
   leased percentage for each of the 3 months during the quarter.

FSP plans to give an update on current leasing activity at select properties as part of its second quarter earnings conference call anticipated to occur during the week ending August 6, 2010.

About Franklin Street Properties Corp.

Franklin Street Properties Corp., based in Wakefield, Massachusetts, is focused on achieving current income and long-term growth through investments in commercial properties. FSP operates in two business segments: real estate operations and investment banking/investment services. The majority of FSP's property portfolio is suburban office buildings, with select investments in certain central business district properties. FSP's subsidiary, FSP Investments LLC (member, FINRA and SIPC), is a real estate investment banking firm and a registered broker/dealer. FSP is a Maryland corporation that operates in a manner intended to qualify as a real estate investment trust (REIT) for federal income tax purposes. To learn more about FSP please visit our website at www.franklinstreetproperties.com.