Prepared and filed by St Ives Financial

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Filed by Brandywine Operating Partnership pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 Under the Securities Exchange Act of 1934 Subject Company: Prentiss Properties Trust Commission File No.:1-14516

This filing relates to a proposed acquisition (the “Acquisition”) by Brandywine Realty Trust (“Brandywine”) of Prentiss Properties Trust (“Prentiss”) pursuant to the terms of an Agreement and Plan of Merger, dated as of October 3, 2005 (the “Merger Agreement”), by and among Brandywine and Prentiss. The Merger Agreement is on file with the Securities and Exchange Commission (the “Commission”) as an exhibit to the Current Report on Form 8-K filed by Brandywine on October 3, 2005. The Merger Agreement is incorporated by reference into this filing.

The following is a analysis presented as additional information by Brandywine on October 28, 2005 regarding the Acquisition and related matters.


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    Prentiss Acquisition  
    Benefits Comparison Analysis 
             
PLAN/PROGRAM   PRENTISS   BRANDYWINE   TRANSITION INFORMATION
             
WELFARE PLANS            
Eligibility   1st of month after 30 days
Full time = 30 hours
  1st of month after 30 days
Full time = 40 hours
  Eligibility for medical, dental and vision the same Life, LTD: Brandywine eligibility 1st of the month after 60 days
             
            No break in coverage after transition
             
    Prentiss years of service will be treated as Brandywine years of service for benefits eligibility     Prentiss plans will continue until the 2nd Quarter of 2006, when a new plan design will be rolled out to all employees.
         
            No pre-existing conditions limitations 
             
            2006 deductibles paid will count towards new plan
             
            Goal is to maintain physician coverage as close as possible to what both
             
            Brandywine and Prentiss have now
             
            For future update: PT eligiblilty
             
Medical            
   Carrier/Model   CIGNA: PPO and POS Plans   Blue Cross: PPO and POS Plans   Both plans have PPO and POS models
             
   Pay Philosophy   Contribution varies by pay level - lower paid employees pay less   All employees pay the same rates   Both plans have pre-tax contributions
             
   Coverage Level   Similar premiums for POS; much lower for PPO; Higher office co-pays, deductibles, Rx   Higher premiums for PPO; lower co-pays, deductibles, Rx   For future update: new combined plan design
             
    Prescriptions included (mail order discount)   Prescriptions included (mail order POS only)   Both plans have prescription coverage
             
   Funding   Self funded up to $125,000/claim   Fully insured    
             
Dental            
   Carrier/Model   CIGNA: PPO plan   Fortis: PPO plan   Similar plan model with higher in-network reimbursement
             
   Pay Philosophy   Employer 70%; Employee 30%   Employer 70%; Employee 30%   Similar employee cost sharing
             
   Coverage Level   Preventive, Basic, Major, Orthodontia   Preventive, Basic, Major, Orthodontia   Similar coverage
             
   Funding   Self-funded   Self-funded    
             
Vision   VSP Plan   Opti-Choice Plan   Brandywine coverage slightly less, lower co-pays



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    Prentiss Acquisition    
    Benefits Comparison Analysis    
             

PLAN/PROGRAM

  PRENTISS   BRANDYWINE   TRANSITION INFORMATION







WELFARE PLANS (Cont.)             
             
Group Life Insurance             
             
   Carrier/Model    Prudential Insurance    Hartford Insurance    Benefit is fully paid by the company for both plans. 
   Pay Philosophy    100% Employer Paid    100% Employer Paid     
             
   Coverage Level    1 x base salary    $50,000    For future update: Resolution of coverage differences 







Supplemental Group Life             
             
   Carrier/Model    Prudential Insurance
Supplemental Life available at cost
  Hartford Insurance
Supplemental Life available at cost
  A supplemental plan will be available in the new plan design. 







  Long Term Disability           Employees on LTD will continue to be covered 
             
   Carrier/Model    CIGNA    Hartford    BDN employees do not pay for LTD; however, the benefit is taxable when received.
    Benefit commences 91st day       Benefit commences 91st day     
   Pay Philosophy    100% Employee Paid       100% Employer Paid     
   Coverage Level    60% of base salary to $5,000/mo maximum       60% of base salary to $6,000/mo. maximum     
            For future update: Brandywine will review addition of supplemental plan at employee cost
    Supplemental plan for higher paid    No plan available     







Short Term Disability             
             
   Carrier/Model    CIGNA - self insured    Company administered - self insured    Brandywine currently administers STD in house. 
   Pay Philosophy    100% Employer Paid    100% Employer Paid    Benefit is company paid and covers 12 weeks of disability 
   Coverage Level    60% - 100%, depending on length of service     60% - 100%, depending on length of service    Brandywine 60% 1st year (after 60 days) 
            80% 2- 4 years 
            100% 5 years 







Sick Days             
             
   Coverage Level    5 days, plus carryover, if available, for qualifying disability       6 days, plus carryover, if available    Brandywine allows carryover of up to 4 days; maximum accumulation 10 days







Flex Plan    Dependent Care $5,000       Dependent Care $5,000    Dependent Care Spending Account same 
             
Pre-Tax Spending Accounts    Health Care $5,000       Health Care $2,000    Brandywine Health Care Spending cap is different. For future update. 


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        Prentiss Acquisition     
        Benefits Comparison Analysis     
             
                         PLAN/PROGRAM                                     PRENTISS                                               BRANDYWINE    TRANSITION INFORMATION 







Payroll    Semi-Monthly, 15th & last day of month Pay is current, Overtime in following pay Direct Deposit ADP    Semi-Monthly, 15th & last day of month Pay is current, Overtime in following pay Direct Deposit ADP    We both pay semi-monthly and current to pay date,  except overtime, part-time 
                        
            Both companies have direct deposit Same pay system   







Vacations    Anniversary Date Accrual    Calendar Year Accrual    Prentiss service will count towards vacation earned under Brandywine's policy 
             
         less than 1 year   = 1 week   On payroll January 1:    If Prentiss employee has vacation scheduled for 2006, can take it 
           1 - 5 years             = 2 weeks         up to 5th anniversary = 2 weeks     
           5 - 9 years             = 3 weeks          5 - 9 years  = 3 weeks     
           10 - 25 years       = 4 weeks         10 + years  = 4 weeks     
           25+ years           = 5 weeks         
    No rollover year to year    No rollover year to year    For future update: Vacations will convert to calendar year accrual. You can take vacation starting on January 1, although you earn it monthly throughout the year     







Holidays    8 days plus 2 floating days               8 days plus 2 personal days    Similar holiday schedules 







             
Employee Assistance Plan    Available 24/7 for confidential assistance/counseling    Available 24/7 for confidential assistance/counseling    Brandywine offers the same type of confidential benefit to you and your dependents 
Other Benefits to be discussed in future bulletin:             
             
*Education Reimbursement             
*Prepaid Legal Plan             
*529 Plan             
*Nissan/Infinity Vehicle Purchase Plan             
*Brandywine Scholarship Program             
*Matching of charitable gifts             


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Prentiss Acquisition
Benefits Comparison Analysis
             
                       PLAN/PROGRAM                                         PRENTISS                                               BRANDYWINE    TRANSITION INFORMATION 

 
 
 
RETIREMENT PLANS             
             
   Carrier    Merrill Lynch    John Hancock/ManuLife    Will look at merged plan in 2006 
             
   Available Funds    14 with lifestyle funds    81 with lifestyle funds    For future update: timing of transition 
             
     Eligibility    1st of Quarter after 1 year    1st of Quarter after 60 days    For future update: timing of entry per ERISA rules 
             
     Match    25% up to 6% of salary    30% up to 10% of salary    For future update: timing of match per ERISA rules 
             
     Profit Sharing    Plan allows; no recent contributions    Profit sharing 2 - 3% over past few years    Although this is discretionary, this Brandywine  benefit is in addition to the match 
           
             
     Vesting    immediate, upon entry    graduated over 3 years    Prentiss employees will be fully vested in Prentiss  carryover account 
           
             
            Past service will count for vesting in Brandywine  plan 
         
             
     Loans    Available for any reason; subject to legal  restrictions    Available for hardship (per IRS) rules only;  subject to legal restrictions    For Prentiss employees moving to Brandywine: loans  outstanding will transition to Brandywine plan with similar  repayment schedules 
 
         
             
            For future update : Brandywine will review loan  eligibility rules. 

 
 
 
             

 
 
 


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Additional Information about the Merger and Where to Find It

This presentation does not constitute an offer of any securities for sale. In connection with the proposed transaction, Brandywine and Prentiss Properties filed a joint proxy statement/prospectus as part of a registration statement on Form S-4 and other documents regarding the proposed merger with the Securities and Exchange Commission. Investors and security holders are urged to read the join proxy statement/prospectus when it becomes available because it will contain important information about Brandywine and Prentiss Properties and the proposed merger. A definitive proxy statement/prospectus will be sent to shareholders of Brandywine and Prentiss Properties seeking their approval of the transaction. Investors and security holders may obtain a free copy of the definitive proxy statement/prospectus (when available) and other documents filed by Brandywine and Prentiss Properties with the SEC at the SEC’s website at www.sec.gov. The definitive joint proxy stat ement/prospectus and other relevant documents may also be obtained, when available, free of cost by directing a request to Brandywine Realty Trust, 401 Plymouth Road, Suite 500, Plymouth Meeting, PA 19462, Attention Investor Relations, (telephone 610-325-5600) or Prentiss Properties Trust, 3890 W. Northwest Highway, Suite 400, Dallas, Texas 75220, Attention: Investor Relations (telephone 214-654-0886). Investors and security holders are urged to read the proxy statement, prospectus and other relevant material when they become available before making any voting or investment decisions with respect to the merger.

Brandywine and Prentiss Properties and their respective trustees and executive officers may be deemed to be participants in the solicitation of proxies from the shareholders of Brandywine and Prentiss Properties in connection with the merger. Information about Brandywine and its trustees and executive officers, and their ownership of Brandywine securities, is set forth in the proxy statement for Brandywine’s 2005 Annual Meeting of Shareholders, which was filed with the SEC on April 1, 2005. Information about Prentiss Properties and its trustees and executive officers, and their ownership of Prentiss Properties securities, is set forth in the proxy statement for the 2005 Annual Meeting of Shareholders of Prentiss Properties, which was filed with the SEC on April 5, 2005. Additional information regarding the interests of those persons may be obtained by reading the proxy statement/prospectus when it becomes available.

This communication shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.