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

|                                                            |                                                  | For the three months        ended March 31,  |   |   | For the years ended December 31, |   |
|-----------------------------------------------------------------|-------------------------------------------------------|---------------------------------------------------|--------|--------|----------------------------------|--------|
|                                                            |                                                  |                                                   |   |   |                                  |   |
|                                                            |                                                  |                                              | 2005   |   |                             |   | 2004 |   |   |   | 2004 |   |   |   | 2003 |   |   |   | 2002 |   |   |   | 2001 |   |   |   | 2000 |   |
|                                                            |                                                  |                                                   |        |   |                             |        |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |
|                                                            |                                                  |                                              |   |   |                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Earnings before fixed charges:**                              |                                                  |                                              |   |   |                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Add:**                                                        |                                                  |                                              |   |   |                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                            | Income from continuing operations (a)                 | $                                                 | 9,691  |   |                             | $      | 13,516 |   |   | $ | 60,281 |   |   | $ | 85,126 |   |   | $ | 57,018 |   |   | $ | 27,222 |   |   | $ | 47,753 |   |
|                                                            | Fixed charges – per below                        |                                              | 20,221 |   |                             |   | 13,581 |   |   |   | 61,062 |   |   |   | 62,407 |   |   |   | 69,881 |   |   |   | 76,558 |   |   |   | 77,535 |   |
| **Less:**                                                       |                                                  |                                              |   |   |                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                            | Income from equity method investments not distributed |                                              | — |   |                             |   | — |   |   |   | — |   |   |   | — |   |   |   | — |   |   |   | — |   |   |   | (518 | ) |
|                                                            | Capitalized interest                                  |                                              | (1,772 | )      |                             |   | (396 | ) |   |   | (3,030 | ) |   |   | (1,503 | ) |   |   | (2,949 | ) |   |   | (5,178 | ) |   |   | (8,182 | ) |
|                                                            |                                                  |                                                   |        |   |                             |        |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |
| Earnings before fixed charges                                   | $                                                     | 28,140                                            |   |   | $                                | 26,701 |   |   | $ | 118,313 |   |   | $ | 146,030 |   |   | $ | 123,950 |   |   | $ | 98,602 |   |   | $ | 116,588 |   |
|                                                            |                                                  |                                                   |        |   |                             |        |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |
| **Fixed charges:**                                              |                                                  |                                              |   |   |                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest expense (including amortization)                       | $                                                     | 17,797                                            |   |   | $                                | 12,104 |   |   | $ | 55,061 |   |   | $ | 57,835 |   |   | $ | 63,522 |   |   | $ | 67,496 |   |   | $ | 64,746 |   |
| Capitalized interest                                            |                                                  | 1,772                                             |   |   |                             | 396    |   |   |   | 3,030 |   |   |   | 1,503 |   |   |   | 2,949 |   |   |   | 5,178 |   |   |   | 8,182 |   |
| Proportionate share of interest for unconsolidated subsidiaries |                                                  | 652                                               |   |   |                             | 1,081  |   |   |   | 2,971 |   |   |   | 3,069 |   |   |   | 3,410 |   |   |   | 3,884 |   |   |   | 4,607 |   |
|                                                            |                                                  |                                                   |        |   |                             |        |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |
|                                                            | Total Fixed Charges                                   | $                                                 | 20,221 |   |                             | $      | 13,581 |   |   | $ | 61,062 |   |   | $ | 62,407 |   |   | $ | 69,881 |   |   | $ | 76,558 |   |   | $ | 77,535 |   |
|                                                            |                                                  |                                                   |        |   |                             |        |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |
| Ratio of earnings to fixed charges                              |                                                  | 1.39                                              |   |   |                             | 1.97   |   |   |   | 1.94 |   |   |   | 2.34 |   |   |   | 1.77 |   |   |   | 1.29 |   |   |   | 1.50 |   |
|                                                            |                                                  |                                                   |        |   |                             |        |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |

| (a) | Amounts for the three    months ended March 31, 2005 and 2004 and for the years ended December 31,    2004, 2003, 2002, 2001 and 2000 have been reclassified to present properties    identified as held for sale consistent with the presentation for the period    ended December 31, 2004. As a result, operations have been reclassified to    discontinued operations from continuing operations for all periods presented. |
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