| **Brandywine Operating Partnership, L.P.**                                        |   |   |
|-----------------------------------------------------------------------------------|--------|--------|
| **Computation of Ratio of Earnings to Fixed Charges**                             |   |   |
|                                                                              |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                              |   |   |   |   |   |   |   | **For the nine months ended September 30,** |   |   | **For the years ended December 31,** |   |   |
|                                                                              |   |   |   |   |   |   |  |  |   |   |  |   |   |
|                                                                              |   |   |   |   |   |   |   | **2005** |   |   | **2004** |   |   | **2004** |   |   | **2003** |   |   | **2002** |   |   | **2001** |   |   | **2000** |   |   |
|                                                                              |   |   |   |   |   |   |  |  |   |   |  |   |   |  |   |   |  |   |   |  |   |   |  |   |   |  |   |   |
| **Earnings before fixed charges:**                                                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Add:**                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                              |   |   | Income from continuing operations (a) | $ | 33,331 |   | $ | 51,836 |   | $ | 60,281 |   | $ | 85,126 |   | $ | 57,018 |   | $ | 27,222 |   | $ | 47,753 |   |   |
|                                                                              |   |   | Fixed charges – per below |   | 62,236 |   |   | 39,974 |   |   | 61,062 |   |   | 62,407 |   |   | 69,881 |   |   | 76,558 |   |   | 77,535 |   |   |
| **Less:**                                                                         |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                              |   |   | Income from equity method investments not   distributed |   | — |   |   | — |   |   | — |   |   | — |   |   | — |   |   | — |   |   | (518 | ) |   |
|                                                                              |   |   | Capitalized interest |   | (6,902 | ) |   | (1,785 | ) |   | (3,030 | ) |   | (1,503 | ) |   | (2,949 | ) |   | (5,178 | ) |   | (8,182 | ) |   |
|                                                                              |   |   |   |   |   |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |   |
| Earnings before fixed charges                                                     | $      | 88,665 |   | $ | 90,025 |   | $ | 118,313 |   | $ | 146,030 |   | $ | 123,950 |   | $ | 98,602 |   | $ | 116,588 |   |   |
|                                                                              |   |   |   |   |   |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |   |
| **Fixed charges:**                                                                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest expense (including amortization)                                         | $      | 53,366 |   | $ | 35,526 |   | $ | 55,061 |   | $ | 57,835 |   | $ | 63,522 |   | $ | 67,496 |   | $ | 64,746 |   |   |
| Capitalized interest                                                              |   | 6,902  |   |   | 1,785 |   |   | 3,030 |   |   | 1,503 |   |   | 2,949 |   |   | 5,178 |   |   | 8,182 |   |   |
| Proportionate share of interest for unconsolidated    subsidiaries |   | 1,968  |   |   | 2,663 |   |   | 2,971 |   |   | 3,069 |   |   | 3,410 |   |   | 3,884 |   |   | 4,607 |   |   |
|                                                                              |   |   |   |   |   |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |   |
|                                                                              |   |   | Total Fixed Charges | $ | 62,236 |   | $ | 39,974 |   | $ | 61,062 |   | $ | 62,407 |   | $ | 69,881 |   | $ | 76,558 |   | $ | 77,535 |   |   |
|                                                                              |   |   |   |   |   |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |   |
| Ratio of earnings to fixed charges                                                |   | 1.42   |   |   | 2.25 |   |   | 1.94 |   |   | 2.34 |   |   | 1.77 |   |   | 1.29 |   |   | 1.50 |   |   |
|                                                                              |   |   |   |   |   |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |  |  |   |   |
|                                                                              |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                              |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| (a)                                                                               |   |   | Amounts for the nine    months ended September 30, 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    September 30, 2005. As a result, operations have been reclassified to discontinued operations    from continuing operations for all periods presented. |   |   |

 

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