Exhibit 31.2

|CERTIFICATION
    PURSUANT TO                              
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|RULES
         13a-14(a) AND 15d-14(a) UNDER THE SECURITIES
|EXCHANGE
    ACT OF 1934, AS AMENDED                       
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|I, Christopher P. Marr, certify that:                      

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|1. | I have reviewed this quarterly report on Form 10-Q of Brandywine Operating Partnership, L.P.:                                                                                                                                                                                                                                            
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|2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered in this report;                               
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|3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;                                                  
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|4. | The registrants other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15(d)-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
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|   | a.                                                                                                                                                                                                                                                                                                                                       
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|   | b.                                                                                                                                                                                                                                                                                                                                       
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|   | c.                                                                                                                                                                                                                                                                                                                                       
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|   | d.                                                                                                                                                                                                                                                                                                                                       
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|5. | The
      registrants other certifying officer(s) and I have disclosed, based
      on our most recent evaluation of internal control over financial reporting,
      to the registrants auditors and the audit committee of the registrants
    board of directors (or persons performing the equivalent functions):                 

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| | a. | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrants ability to record, process, summarize and report financial information; and
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| | b. | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial reporting.                                                                                               

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|                          | /s/ Christopher P. Marr                          
|                          |                                                  
|                          | Christopher P. Marr                              
|                          | Senior Vice President and Chief Financial Officer
|Date: August
    12, 2005 |                                                  

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