Exhibit
12.1

Brandywine Operating Partnership, L.P.Computation of Ratio of Earnings to Fixed Charges
(in thousands)

|                                                                    |                                      | For the six months |   |      |       
|------------------------------------------------------------------- | ------------------------------------ | ------------------ | - | ---- | ------
|ended June 30,                                                      | For
    the years ended December 31,
|                                                                    |                                     
|                                                                    | 2005                                 |                    |   | 2004 |       
|                                                                    |                                      |                    |   |      |       
|Earnings
    before fixed charges:                                  |                                      |                    |   |      |       
|Add:                                                                |                                      |                    |   |      |       
|Income from continuing operations (a)                               | $                                    | 18,876             |   | $    | 32,428
|Fixed
       charges — per below                                    |                                      | 40,782             |   |      | 26,702
|Less:                                                               |                                      |                    |   |      |       
|Income
    from equity method investments not distributed           |                                      | —                  |   |      | —     
|Capitalized interest                                                |                                      | (3,870             | ) |      | (991  
|                                                                    |                                      |                    |   |      |       
|Earnings before fixed charges                                       | $                                    | 55,788             |   | $    | 58,139
|                                                                    |                                      |                    |   |      |       
|Fixed
    charges:                                                  |                                      |                    |   |      |       
|Interest expense (including amortization)                           | $                                    | 35,604             |   | $    | 24,052
|Capitalized interest                                                |                                      | 3,870              |   |      | 991   
|Proportionate
    share of interest for unconsolidated subsidiaries |                                      | 1,308              |   |      | 1,659 
|                                                                    |                                      |                    |   |      |       
|                                                                    |                                      |                    |   |      |       
|Total Fixed Charges                                                 | $                                    | 40,782             |   | $    | 26,702
|                                                                    |                                      |                    |   |      |       
|Ratio of earnings to fixed charges                                  |                                      | 1.37               |   |      | 2.18  
|                                                                    |                                      |                    |   |      |       

|   
|---
|   
|(a)
|   

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