##### 



Exhibit 12.1
 Brandywine Realty Trust
Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Share Distributions
(in thousands)
 For the nine months ended September 30,
    
    
    For the years ended December 31,2007
    
    
    2006
    
    
    2006
    
    
    2005
    
    
    2004
    
    
    2003
    
    
    2002Earnings before fixed charges:Add:Income (loss) from continuing operations (a)
    
    $
    (4,206
    )
    
    $
    (25,996
    )
    
    $
    (18,423
    )
    
    $
    33,065
    
    
    $
    49,784
    
    
    $
    65,588
    
    
    $
    35,977Minority interest attributable to continuing operations
    
    
    (353
    )
    
    
    (2,046
    )
    
    
    (1,493
    )
    
    
    1,059
    
    
    
    2,183
    
    
    
    8,827
    
    
    
    8,813Fixed charges  per below
    
    
    142,962
    
    
    
    140,478
    
    
    
    191,614
    
    
    
    86,191
    
    
    
    61,443
    
    
    
    69,476
    
    
    
    76,950Less:Capitalized interest
    
    
    (12,757
    )
    
    
    (7,210
    )
    
    
    (9,537
    )
    
    
    (9,603
    )
    
    
    (3,030
    )
    
    
    (1,503
    )
    
    
    (2,949
    )Preferred Distributions of consolidated subsidiaries
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    (832
    )
    
    
    (7,069
    )
    
    
    (7,069
    )Earnings before fixed charges
    
    $
    125,646
    
    
    $
    105,226
    
    
    $
    162,161
    
    
    $
    110,712
    
    
    $
    109,548
    
    
    $
    135,319
    
    
    $
    111,722Fixed charges and Preferred Distributions:Interest expense (including amortization)
    
    $
    125,410
    
    
    $
    128,540
    
    
    $
    175,784
    
    
    $
    73,918
    
    
    $
    54,610
    
    
    $
    57,835
    
    
    $
    63,522Capitalized interest
    
    
    12,757
    
    
    
    7,210
    
    
    
    9,537
    
    
    
    9,603
    
    
    
    3,030
    
    
    
    1,503
    
    
    
    2,949Proportionate share of interest for unconsolidated real estate ventures
    
    
    4,795
    
    
    
    4,728
    
    
    
    6,293
    
    
    
    2,670
    
    
    
    2,971
    
    
    
    3,069
    
    
    
    3,410Distributions to preferred unitholders in Operating Partnership
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    832
    
    
    
    7,069
    
    
    
    7,069Total Fixed Charges
    
    
    142,962
    
    
    
    140,478
    
    
    
    191,614
    
    
    
    86,191
    
    
    
    61,443
    
    
    
    69,476
    
    
    
    76,950Income allocated to preferred shareholders
    
    
    5,994
    
    
    
    5,994
    
    
    
    7,992
    
    
    
    7,992
    
    
    
    9,720
    
    
    
    11,906
    
    
    
    11,906Total Preferred Distributions
    
    
    5,994
    
    
    
    5,994
    
    
    
    7,992
    
    
    
    7,992
    
    
    
    9,720
    
    
    
    11,906
    
    
    
    11,906Total combined fixed charges and preferred distributions
    
    $
    148,956
    
    
    $
    146,472
    
    
    $
    199,606
    
    
    $
    94,183
    
    
    $
    71,163
    
    
    $
    81,382
    
    
    $
    88,856Ratio of earnings to combined fixed charges and preferred distributions
    
    
    (b
    )
    
    
    (b
    )
    
    
    (b
    )
    
    
    1.18
    
    
    
    1.54
    
    
    
    1.66
    
    
    
    1.26
 
 (a)
    
    Amounts for the nine-months ended September 30, 2007 and 2006 and for the years ended December
31, 2006, 2005, 2004, 2003 and 2002 have been reclassified to present properties sold consistent
with the presentation for the period ended September 30, 2007. As a result, operations have been
reclassified to discontinued operations from continuing operations for all periods presented.(b)
    
    Due to the registrants loss in the period, the coverage ratio was less than 1:1. The
registrant must generate additional earnings of $23,310 and $41,246 for the nine-months ended
September 30, 2007 and 2006, respectively and $37,445 for the year ended December 31, 2006 to
achieve a coverage ratio of 1:1.