<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C. 20549


                                  FORM 10-Q/A
   
                                AMENDMENT NO. 1    
                                        



                 Quarterly Report under Section 13 or 15(d) of
                      the Securities Exchange Act of 1934



For the Quarter Ended March 31, 1998             Commission File Number  1-14516


                           PRENTISS PROPERTIES TRUST
            (Exact Name of Registrant as Specified in its Charter)

                                        

           MARYLAND                                          75-2661588
(State or Other Jurisdiction of                           (I.R.S. Employer
Incorporation or Organization)                          Identification No.)

                                        


         3890 West Northwest Highway, Suite 400, Dallas, Texas  75220
             (Address of Registrant's Principal Executive Office)


                                (214) 654-0886
             (Registrant's Telephone Number, Including Area Code)



     Indicate by check mark whether the Registrant (i) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such report), and (ii) has been subject to such
filing requirements for the past 90 days.

                         Yes  X              No 
                             ---                ---

The number of Common Shares of Beneficial Interest, $0.01 par value, outstanding
as of December 16, 1998, was 38,926,488 and the number of outstanding
Participating Cumulative Redeemable Preferred Shares of Beneficial Interest,
Series A, was 3,773,585.
<PAGE>
 
                           PRENTISS PROPERIES TRUST
                                        
                                        
                                     INDEX
                                     -----
 
PART I:   FINANCIAL INFORMATION                                      PAGE NUMBER
                                                                     -----------

          Item 1.   Financial Statements
 
                    Consolidated Balance Sheets of Prentiss 
                    Properties Trust at March 31, 1998 
                    (unaudited) and December 31, 1997                      4

 
                    Consolidated Statements of Income of 
                    Prentiss Properties Trust for the three 
                    month periods ended March 31, 1998 
                    and 1997 (unaudited)                                   5
 
                    Consolidated Statements of Cash Flows 
                    of Prentiss Properties Trust for the 
                    three month periods ended March 31, 1998 
                    and 1997 (unaudited)                                   6
 
                    Notes to Consolidated Financial Statements          7-13
 
          Item 2.   Management's Discussion and Analysis of 
                    Financial Condition and Results of Operations      14-18
 
          Item 3.   Quantitative and Qualitative Disclosures 
                    about Market Risk                                     18
                    
PART II:  OTHER INFORMATION
 
          Item 1.   Legal Proceedings                                     19
          Item 2.   Changes in Securities                                 19
          Item 3.   Defaults Upon Mortgages and Notes Payable             19
          Item 4.   Submission of Matters to a Vote of Security Holders   19
          Item 5.   Other Information                                     19
          Item 6.   Exhibits and Reports on Form 8-K                   19-20
 
SIGNATURE                                                                 21

                                       2
<PAGE>
   
   This Amendment No. 1 to Form 10-Q amends and supplements the quarterly report
on Form 10-Q for the three month period ended March 31, 1998, filed with the 
Securities and Exchange Commission on May 13, 1998 (the "Form 10-Q"), of 
Prentiss Properties Trust (the "Company"). Capitalized terms used herein have 
the meanings ascribed to such terms in the Form 10-Q unless otherwise defined
herein. The Form 10-Q is hereby amended and supplemented as follows by adding a
discussion to Part I, Item 2, Management's Discussion and Analysis of Financial
Condition and Results of Operations regarding a common share purchase agreement
and related forward stock contract with UBS Limited and Union Bank of
Switzerland, London Branch:    

                                       3
<PAGE>
 
                           PRENTISS PROPERTIES TRUST
                          CONSOLIDATED BALANCE SHEETS

                   (dollars in thousands, except share data)

<TABLE> 
<CAPTION> 
                                                                     MARCH 31,    DECEMBER 31,
                                                                       1998           1997
                                                                    ----------    ------------
                                                                    (UNAUDITED)   
<S>                                                                 <C>           <C>
                             ASSETS                                               
                                                                                  
Real estate.....................................................    $1,349,356     $1,170,992
   Less: accumulated depreciation...............................       (42,702)       (36,143)
                                                                    ----------     ----------
                                                                     1,306,654      1,134,849
                                                                                  
Deferred charges and other assets, net..........................        27,118         24,636
Mortgage note receivable........................................        35,986         36,331
Receivables, net................................................        14,388         10,865
Cash and cash equivalents.......................................        10,361          7,075
Escrowed cash...................................................         5,299          4,524
Other receivables (affiliates)..................................           218          1,928
Investments in joint venture and unconsolidated subsidiary......        14,008         19,638
                                                                    ----------     ----------
  Total assets..................................................    $1,414,032     $1,239,846
                                                                    ==========     ==========
                                                                                  
                 LIABILITIES AND SHAREHOLDERS' EQUITY                                              
                                                                                  
Liabilities:                                                                      
  Debt on real estate...........................................    $  460,009     $  420,030
  Accounts payable and other liabilities........................        33,111         35,795
  Distributions payable.........................................        17,650         14,782
                                                                    ----------     ----------
     Total liabilities..........................................       510,770        470,607
                                                                    ----------     ----------
                                                                                  
Minority interest in operating partnership......................        29,418         71,547
                                                                    ----------     ----------
Minority interest in real estate partnerships...................         1,091          1,060
                                                                    ----------     ----------
Commitments and contingencies                                                     
                                                                                  
Shareholders' equity:                                                             
  Preferred shares $.01 par value, 20,000,000 shares                           
   authorized, 3,773,585 and 2,830,189 shares issued and                           
   outstanding at March 31, 1998 and December 31, 1997,                            
   respectively.................................................       100,000         75,000                   
  Common shares $.01 par value, 100,000,000 shares              
   authorized, 39,861,270 and 33,191,483 shares issued                          
   and outstanding at March 31, 1998 and                                        
   December 31, 1997, respectively..............................           399            332            
  Additional paid-in capital....................................       786,339        628,086 
  Distributions in excess of accumulated earnings...............       (13,985)        (6,786) 
                                                                    ----------     ----------
     Total shareholders' equity.................................       872,753        696,632
                                                                    ----------     ----------
     Total liabilities and shareholders' equity.................    $1,414,032     $1,239,846
                                                                    ==========     ==========
</TABLE>


   The accompanying notes are an integral part of these financial statements.

                                       4
<PAGE>
 
                           PRENTISS PROPERTIES TRUST
                       CONSOLIDATED STATEMENTS OF INCOME
                                  (UNAUDITED)
                       (in thousands, except share data)

<TABLE>
<CAPTION>
 
                                                                                          THREE MONTHS             THREE MONTHS
                                                                                             ENDED                     ENDED
                                                                                         MARCH 31, 1998           MARCH 31, 1997
                                                                                         --------------           --------------
<S>                                                                                      <C>                      <C>
Revenues:
  Rental income.........................................................                    $49,965                   $21,975
  Mortgage interest.....................................................                        960                 
  Management fees.......................................................                        262                       247
  Development, leasing, sale and other fees.............................                        186                       432
                                                                                            -------                   -------
   Total revenues.......................................................                     51,373                    22,654
                                                                                            -------                   -------
Expenses:                                                                                                           
 Property operating and maintenance.....................................                     11,496                     5,313
 Real estate taxes......................................................                      5,275                     2,457
 General and administrative.............................................                        784                       554
 Personnel costs, net...................................................                      1,088                       709
 Interest expense.......................................................                      8,146                     2,653
 Amortization of deferred financing costs...............................                        196                       173
 Depreciation and amortization..........................................                      8,515                     3,835
                                                                                            -------                   -------
   Total expenses.......................................................                     35,500                    15,694
                                                                                            -------                   -------
                                                                                                                    
Equity in income of joint venture and unconsolidated subsidiaries.......                      1,246                     1,419
                                                                                            -------                   -------
                                                                                                                    
Income before gain on sale, minority interest, and extraordinary item...                     17,119                     8,379
Gain on sale............................................................                      2,555                          
Minority interest.......................................................                     (1,270)                   (1,188)
                                                                                            -------                   ------- 
                                                                                                                    
Income before extraordinary item........................................                     18,404                     7,191
Extraordinary item......................................................                     (8,908)                     (111)
                                                                                            -------                   -------

Net income..............................................................                    $ 9,496                   $ 7,080
Preferred dividends.....................................................                     (1,136)                
                                                                                            -------                   
Net income applicable to common shareholders............................                    $ 8,360                   $ 7,080
                                                                                            =======                   ======= 

Net income per Common Share before extraordinary item  basic............                    $  0.47                   $  0.35
Extraordinary item......................................................                      (0.24)                
                                                                                            -------                   -------
                                                                                                            
Net income per Common Share  basic......................................                    $  0.23                   $  0.35
                                                                                            -------                   -------
                                                                                                                    
Weighted average number of Common Shares outstanding  basic.............                     36,716                    20,280
                                                                                            =======                   =======
                                                                                                                    
Net income per Common Share before                                                                                  
    extraordinary item  diluted.........................................                    $  0.47                   $  0.34
Extraordinary item......................................................                      (0.24)                
                                                                                            -------                   -------
Net income per Common Share  diluted....................................                    $  0.23                   $  0.34
                                                                                            =======                   =======
Weighted average number of Common Shares and                                                                        
 Common Share equivalents outstanding  diluted..........................                     37,105                    20,652
                                                                                            =======                   ======= 
</TABLE>
                                                                                

   The accompanying notes are an integral part of these financial statements.

                                       5
<PAGE>
 
                           PRENTISS PROPERTIES TRUST
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  (UNAUDITED)
                             (dollars in thousands)

<TABLE>
<CAPTION>
 
                                                                                THREE MONTHS         THREE MONTHS
                                                                                    ENDED               ENDED
                                                                               MARCH 31, 1998       MARCH 31, 1997
                                                                               --------------       --------------
<S>                                                                            <C>                  <C>
CASH FLOWS FROM OPERATING ACTIVITIES:                                                               
   Net income.............................................................        $   9,496           $   7,080
                                                                                                      
   Adjustments to reconcile net income to net cash provided by operating                              
    activities:                                                                                       
       Minority interest..................................................            1,270               1,188
       Extraordinary item.................................................            8,908                 111
       Gain on sale.......................................................           (2,555)          
       Depreciation and amortization......................................            8,515               3,835
       Amortization of deferred financing costs...........................              196                 173
       Equity in income of joint venture and unconsolidated subsidiaries..           (1,246)             (1,419)
       Non-cash compensation..............................................               13           
  Changes in assets and liabilities, net of non-cash effect of                                        
   acquisitions:                                                                  
   Provision for doubtful accounts........................................              495                  40
   Receivables............................................................           (4,018)             (1,395)
   Deferred charges and other assets......................................             (155)             (3,074)
   Escrowed cash..........................................................             (775)               (765)
   Accounts payable and other liabilities.................................           (4,782)               (980)
   Amounts due to/from affiliates.........................................            1,710                 (82)
                                                                                  ---------           ---------                     

   Net cash provided by operating activities..............................           17,072               4,712
                                                                                  ---------           ---------
CASH FLOWS FROM INVESTING ACTIVITIES:                                                                 
   Purchase of real estate................................................         (149,877)            (47,227)
   Investment in real estate..............................................          (26,003)                  
   Investment in mortgage note receivable.................................              345                   -
   Proceeds from sale of real estate......................................            8,092                   -
   Distributions received from joint venture and unconsolidated
    subsidiaries..........................................................              362               1,889
                                                                                  ---------           ---------
   Net cash used in investing activities..................................         (167,081)            (45,338)
                                                                                  ---------           ---------
CASH FLOWS FROM FINANCING ACTIVITIES:                                                                 
   Net proceeds from sale of Common Shares................................          106,995                   -
   Net proceeds from sale of Preferred Shares.............................           25,000                   -
   Distributions paid to limited partners.................................           (1,480)             (1,022)
   Distributions paid to common shareholders..............................          (13,277)             (6,287)
   Distributions paid to preferred shareholders...........................              (25)                  -
   Proceeds from debt on real estate......................................          207,091             200,776
   Repayments of debt on real estate......................................         (171,009)           (128,200)
                                                                                  ---------           ---------
   Net cash provided by financing activities..............................          153,295              65,267
                                                                                  ---------           ---------
                                                                                                      
   Net increase in cash and cash equivalents..............................            3,286              24,641
   Cash and cash equivalents, beginning of period.........................            7,075               7,226
                                                                                  ---------           ---------
   Cash and cash equivalents, end of period...............................        $  10,361           $  31,867
                                                                                  =========           =========
SUPPLEMENTAL CASH FLOW INFORMATION:                                                                   
   Cash paid for interest.................................................        $   8,227           $   2,086
                                                                                  =========           =========
</TABLE>



   The accompanying notes are an integral part of these financial statements.

                                       6
<PAGE>
 
1.   THE ORGANIZATION

     The Company is a self-administered and self-managed Real Estate Investment
Trust ("REIT") that acquires, owns, manages, leases, develops and builds office
and industrial properties throughout the United States.  The Company operates
principally through Prentiss Properties Acquisition Partners, L.P. and its
subsidiaries (the "Operating Partnership") and Prentiss Properties Limited, Inc.
(the "Manager") (collectively referred to herein as the "Company").  As of March
31, 1998, the Company owned interests in a diversified portfolio of 229
primarily suburban Class "A" office and suburban industrial properties (the
"Properties") containing approximately 19.8 million net rentable square feet.
The Properties are located in 19 major U.S. markets and consist of 98 office
buildings (the "Office Properties") containing approximately 10.4 million net
rentable square feet and 131 industrial buildings (the "Industrial Properties")
containing approximately 9.4 million net rentable square feet.  The Properties
include seven office and three industrial development projects, including one
expansion of an existing Property, totaling approximately 1.3 million square
feet.  Exclusive of the development projects, as of March 31, 1998, the Office
Properties were approximately 96% leased to approximately 850 tenants and the
Industrial Properties were approximately 96% leased to approximately 400
tenants.  In addition to the 229 Properties owned, the Company manages
approximately 29.2 million net rentable square feet in 256 office and industrial
properties, in 19 U.S. markets, that are owned by third-parties.

     At December 31, 1997, the Company owned a total of 170 Properties.  During
the three month period ended March 31, 1998, the Company acquired 59 Properties
comprising 1.8 million square feet, sold one office property containing 118,000
square feet and began development of one office project totaling 97,000 square
feet.  The Company also brought one industrial development project comprising
136,200 square feet on-line during the quarter.
    
     The Direct Placement Offerings, UBS Forward Agreement, Unit Conversion and 
     Preferred Shares     

     The operating partnership and the Company entered into a Purchase
Agreement, dated February 2, 1998, with UBS Limited and Union Bank of
Switzerland, London Branch, acting through its agent UBS Securities LLC (all as
succeeded by UBS, AG, London Branch, acting through its agent Warburg Dillon
Read LLC, "UBS-LB") involving the sale of 1,100,000 Common Shares (the "UBS
Purchase Agreement"). The operating partnership and the Company also entered
into a related forward stock contract, dated February 2, 1998, with UBS-LB (the
"UBS Forward Agreement"), which provides for certain purchase price adjustments.
The maturity date of the UBS Forward Agreement is February 2, 1999, subject to
acceleration as described more fully below.

     The UBS Forward Agreement generally provides that if the market price of a
Common Share on the maturity date is less than a certain amount (the "Forward
Price"), the Company must pay UBS-LB the difference multiplied by 1,100,000.
Similarly, if the market price of a Common Share is above the Forward Price, 
UBS-LB must pay the Company the difference in Common Shares. If the Company 
chooses not to, or if the Company cannot, settle in freely tradable Common
Shares, the Company must repurchase the 1,100,000 shares at the Forward Price in
cash. Over the life of the UBS Forward Agreement, the Forward Price will be
adjusted by LIBOR plus 135 basis points, minus any dividends received on the
Common Shares.
    
     To secure the Company's obligations under the UBS Forward Agreement, the
UBS Forward Agreement provides for quarterly payments of collateral equal to
1,100,000 times 105% of the amount by which the market price of a Common Share
is below the Forward Price. The collateral may be in the form of cash, letters
of credit or freely tradable Common Shares. As of the last recalculation date of
the Forward Price, which was April 30, 1998, the Forward Price was $27.055 per
share. Based on the then current share price of $25.313, this resulted in a
collateral requirement of approximately $1.9 million.  The Company has secured
this requirement entirely with cash and letters of credit.     
    
     Although maturity date of the UBS Forward Agreement is February 2, 1999; if
the closing price of the Common Shares falls below $16.40 for a period of three
consecutive trading days, or if the market value of Common Shares, excluding
operating partnership units, declines to or below $600 million, UBS-LB has the
right to force a complete settlement under the UBS Forward Agreement, if the
closing price of the Common Shares falls below $18.50 for a period of three
consecutive trading days, UBS-LB has the right to force a settlement with
respect to 67% of the Transaction. UBS-LB also has the right to force a complete
settlement under the UBS Forward Agreement if the Company:     

 . is in default with respect to certain financial covenants under the UBS
  Forward Agreement,
 . is in default under its credit facility with a syndicate of lenders or any
  other unsecured lending agreement, or
 . fails to post sufficient cash collateral.

     On February 18, 1998, the Company closed two direct placements totaling
1,816,006 Common Shares resulting in gross proceeds of approximately $49.5
million or $27.25 per share.  The Common Shares were underwritten in two
separate transactions by Prudential Securities Incorporated ("Prudential") and
Smith Barney Inc. ("Smith Barney").  Prudential underwrote 922,676 Common Shares
and Smith Barney underwrote 893,330 Common Shares.  The net proceeds from the
sales to Prudential and Smith Barney were contributed to the Operating
Partnership in exchange for Units.

     On February 23, 1998, the Company closed a direct placement of 1,198,157
Common Shares resulting in gross proceeds of approximately $32.5 million or
$27.125 per share.  The Common Shares were underwritten by A.G. Edwards & Sons,
Inc. ("AG Edwards") The net proceeds from the sale to AG Edwards were
contributed to the Operating Partnership in exchange for Units.

     In connection with the Company's initial public offering ("IPO"), certain
entities affiliated with the Company (the "Merged Entities") received Units in
exchange for certain assets they contributed to the Operating Partnership.  In
February 1998, (i) the Merged Entities distributed 113,500 Units to certain
employees of the Merged Entities (the "Merged Entity Employees"), (ii) the
Company issued 2,432,541 Common Shares in exchange for all of the capital stock
of the Merged Entities to the owners of the Merged Entities (the "Merged Entity
Owners"), and (iii) the Merged Entity Employees redeemed their 113,500 Units in
exchange for an equal number of Common Shares.  These transactions were approved
by a quorum of the independent members of the Company's Board of Trustees.

     On March 31, 1998, pursuant to an agreement entered into between the
Company and Security Capital Preferred Growth Incorporated ("SCPG"), the Company
issued 943,396 Series "A" Cumulative Convertible Redeemable Preferred Shares
("Series A Convertible Preferred Shares") for $26.50 per share.  The Company
contributed the net proceeds from the sale of the Series A Convertible Preferred
Shares to the Operating Partnership 

                                       7
<PAGE>
 
in exchange for preferred Units. The 943,396 Series A Convertible Preferred
Shares are convertible into an equal number of Common Shares and have rights to
a dividend equal to the dividend paid on Common Shares.

     The Properties

     During the three months ended March 31, 1998, the Company acquired 59
Properties containing approximately 1.8 million square feet (collectively the
"Acquired Properties"), sold one office property containing 118,000 square feet
and began development of one office project totaling 97,000 square feet. The
Company also brought one industrial development project comprising 136,200
square feet on-line during the quarter.

     The Acquired Properties consist of 8 Class "A" suburban Office Properties
(the "Acquired Office Properties") totaling 558,000 square feet and 51 suburban
Industrial Properties (the "Acquired Industrial Properties") totaling 1.2
million square feet.

2.   BASIS OF PRESENTATION

     The consolidated financial statements of the Company include all the
accounts of the Company, its majority-owned Operating Partnership and
subsidiaries.  The financial statements for the three months ended March 31,
1998, include (i) the results of operations of 154 operating Properties and 8
development projects for the entire period presented, (ii) the results of
operations of the 59 Acquired Properties and 1 development project for the
portion of the period subsequent to acquisition or commencement of development
by the Company, (iii) the results of operations of the 5307 East Mockingbird
property for the portion of the period before the Company sold the property in
March 1998, (iv) a 50% equity interest in the 7 Broadmoor Austin Properties, and
(v) results of operations of the Prentiss Properties Service Business conducted
primarily by the Manager in the period presented.  The financial statements for
the three months ended March 31, 1997, include (i) the results of operations of
88 operating Properties (inclusive of the 5307 East Mockingbird property) and 3
development projects for the entire period presented, (ii) the results of
operations of 7 Properties acquired during the period for the portion of the
period subsequent to acquisition by the Company, (iii) an approximate 50% equity
interest in the 7 Broadmoor Austin Properties, and (iv) results of operations of
the Prentiss Properties Service Business conducted primarily by the Manager in
the period presented.  All significant intercompany balances and transactions
have been eliminated.

     The accompanying financial statements are unaudited; however, the financial
statements of the Company have been prepared in accordance with generally
accepted accounting principles ("GAAP") for interim financial information and
the rules and regulations of the Securities and Exchange Commission ("SEC").
Accordingly, they do not include all of the disclosures required by GAAP for
complete financial statements.  In the opinion of management, all adjustments
(consisting solely of normal recurring matters) necessary for a fair
presentation of the financial statements for these interim periods have been
included.  The results for the three  months ended March 31, 1998 are not
necessarily indicative of the results to be obtained for the full fiscal year.
These financial statements should be read in conjunction with the December 31,
1997 audited financial statements and notes thereto of the Company, included in
its annual report on Form 10-K for the fiscal year ended December 31, 1997.

3.   REAL ESTATE

     A brief description of the Properties acquired and other significant
transactions occurring during the three months ended March 31, 1998 follows:

     On January 9, 1998, the Company acquired three Class "A" Office Properties
containing 141,139 square feet located in the suburban Philadelphia,
Pennsylvania, area.  The purchase price of the Properties, excluding closing
costs, totaled approximately $13.8 million.

     On January 13, 1998, the Company acquired six Industrial Properties
containing 382,234 square feet located in the San Jose, California, area.  The
purchase price of the Properties, excluding closing costs, totaled approximately
$26.6 million.

     On January 30, 1998, the Company acquired a single Class "A" Office
Property containing 234,222 square feet located in the Denver, Colorado, area.
The purchase price of the Property, excluding closing costs, totaled
approximately $31.0 million.

                                       8
<PAGE>
 
     On February 5, 1998, the Company acquired four Class "A" Office Properties
and 45 Industrial Properties containing 1.0 million square feet located in the
San Diego, California, and Tucson, Arizona, areas.  The purchase price of the
Properties, excluding estimated closing costs, totaled approximately $80.4
million.

     On March 31, 1998, the Company disposed of the 5307 East Mockingbird
property for total sale proceeds of approximately $8.2 million resulting in a
gain on sale of approximately $2.6 million.

4.   DEBT ON REAL ESTATE

     At December 31, 1997, the Company had debt on real estate of $420.0
million, excluding the Company's proportionate share of the debt on the
Broadmoor Austin Properties.  The Company owns a 50% equity interest in the
Broadmoor Austin Properties and accounts for its interest using the equity
method of accounting.

     On March 11, 1998, the Company closed a $35.0 million non-recourse mortgage
with CIGNA collateralized by the Walnut Glen Tower Property.  The new loan has a
6.92% interest rate and a seven-year term with an option to extend for one year.
The existing $10.0 million loan, which had a rate of 7.50%, was repaid with the
proceeds.

     The Company is obligated under three loans (the "Construction Loans") to
fund the construction and development of four Properties.  The Construction
Loans provide for total funding of $44.5 million, of which $11.7 million was
drawn during the period, resulting in an outstanding balance of $21.7 million at
March 31, 1998.  The Construction Loans bear interest at varying rates, from
LIBOR plus 165 basis points to LIBOR plus 175 basis points, and mature at dates
from September 2000 to December 2000.

     In connection with the acquisition of one of the Acquired Properties, the
Company assumed debt totaling $3.9 million.  Such debt is a fixed rate,
amortizing loan with an interest rate of 8.30% and a 20-year amortization
period.  The loan is collateralized by the Property and matures on September 19,
2006.

     During the three months ended March 31, 1998, the Company repaid, to First
Union National Bank, $5.5 million of borrowings under a construction loan which
was assumed by the Company in connection with the acquisition of certain
Properties in October 1997.  The loan which was repaid with proceeds from
borrowings under the Company's Line of Credit (as defined below) had a maturity
of April 10, 1998 and bore interest at LIBOR plus 250 basis points.

     On December 31, 1997, the Company replaced the existing line of credit with
a new $300 million unsecured line of credit with a group of 12 banks (the "Line
of Credit").  The Line of Credit reduced the interest rate on borrowings from
LIBOR plus 175 basis points to LIBOR plus 137.5 basis points.  The Line of
Credit is unsecured and has a term of three years.  Additionally, the Company is
required to pay an average daily unused commitment fee of 20 basis points per
annum if the daily unused portion of the Line of Credit is greater than the
related daily balance outstanding.  The fee is reduced to 15 basis points per
annum if the daily unused portion is less than the daily balance outstanding.
At December 31, 1997, the Company had no borrowings outstanding under the Line
of Credit.  During the three months ended March 31, 1998, the Company had net
borrowings under the Line of Credit of $5.0 million.

     At December 31, 1997, the Company had outstanding borrowings of $120
million under the short-term variable rate acquisition loan (the "Acquisition
Loan").  The Acquisition Loan has an interest rate of LIBOR plus 125 basis
points and will mature in August 1998.  The Company anticipates converting the
Acquisition Loan to a multi-year facility.

                                       9
<PAGE>
 
     Future scheduled principal repayments of debt on real estate are as
follows:

                                                           (in thousands)
          1998.........................................       $120,000
          1999.........................................    
          2000.........................................         32,742
          2001.........................................    
          2002.........................................          3,050
          Thereafter...................................        304,217
                                                              --------
                                                              $460,009/(A)/
                                                              ========
                                                                                
          /(A)/  The amount shown excludes the Company's 50% share of the
                 mortgage indebtedness which is collateralized by the Broadmoor
                 Austin Properties.

5.   DISTRIBUTION

     On March 18, 1998, the Company declared a cash distribution for the first
quarter of 1998 in the amount of $.40 per share, payable on April 17, 1998 to
common shareholders of record on March 31, 1998. In addition, it was determined
that a distribution of $.40 per Unit would be made to the partners of the
Operating Partnership and the holders of the Company's Series A Convertible
Preferred Shares. The total distributions were paid on April 17, 1998, totaling
approximately $17.6 million.

6.   INVESTMENT IN JOINT VENTURE AND UNCONSOLIDATED SUBSIDIARIES

     Included in investments in joint venture and unconsolidated subsidiaries
are the Company's investment in the Broadmoor Austin Associates Joint Venture
("Broadmoor Austin") and the Company's investment in the Manager. The Company
accounts for its 50% investment in Broadmoor Austin and its 95% investment in
the Manager using the equity method of accounting, and thus reports its share of
income and losses based on its ownership interest in the respective entities. At
March 31, 1998, the carrying value of the Company's interest in Broadmoor Austin
and the Manager totaled $8.1 million and $5.9 million, respectively. The
difference between the carrying value of the Company's interest in Broadmoor
Austin and the book value of the underlying equity is being amortized over 40
years.

     The following is summarized financial information for 100% of Broadmoor
Austin at March 31, 1998 and December 31, 1997 and for the three months ended
March 31, 1998 and 1997:

<TABLE> 
<CAPTION> 
BALANCE SHEET:                              MARCH 31, 1998        DECEMBER 31, 1997
-------------                               --------------        -----------------
                                        (DOLLARS IN THOUSANDS) (DOLLARS IN THOUSANDS)
<S>                                     <C>                    <C>
Real estate and deferred charges, net...        $111,203               $111,524
Total assets............................        $123,549               $126,341
Mortgage note payable...................        $154,000               $140,000
Venturers' deficit......................        $(30,500)              $(17,134)

<CAPTION>
                                             THREE MONTHS           THREE MONTHS
                                                 ENDED                 ENDED
                                            MARCH 31, 1998         MARCH 31, 1997
INCOME STATEMENT:                           --------------         --------------
----------------                        (DOLLARS IN THOUSANDS) (DOLLARS IN THOUSANDS)
                                        
Rental income...........................        $  4,879                $4,870
Interest expense........................        $  3,358                $3,366
Depreciation and amortization...........        $  1,064                $1,083
Extraordinary item......................        $ 12,900                
Net income..............................        $(12,642)               $  275
</TABLE>


     On March 31, 1998 the Company closed a $154.0 million refinancing of its
Broadmoor Austin Properties. Broadmoor Austin is a joint venture between the
Operating Partnership and IBM who leases 100% of the Properties.  The
refinancing, which was funded by an affiliate of Lehman Brothers Inc., is a 13-
year non-recourse term loan at a 

                                      10
<PAGE>
 
fixed rate of 7.04%. The Company repaid the existing $140.0 million mortgage
which had an interest rate of 9.75%. In connection with the repayment of the
existing loan, Broadmoor Austin paid $12.7 million in prepayment penalties and
wrote off unamortized financing costs of approximately $200,000, both of which
the joint venture recorded as extraordinary charges during the period.
Concurrent with this refinancing, IBM extended the lease on 70% of its space
from 2006 to 2011.

     The following is summarized financial information for 100% of the Manager
at March 31, 1998 and December 31, 1997 and for the three months ended March 31,
1998 and 1997:

<TABLE>
<CAPTION>
BALANCE SHEET:                           MARCH 31, 1998            DECEMBER 31, 1997
-------------                            --------------            -----------------
                                     (DOLLARS IN THOUSANDS)      (DOLLARS IN THOUSANDS)
<S>                                  <C>                         <C>
Total assets.......................          $18,583                     $21,668
Total liabilities..................          $12,498                     $16,700
Owners' equity.....................          $ 6,085                     $ 4,968
                                
<CAPTION>                       
                                          THREE MONTHS                Three Months
                                             ENDED                       ENDED
INCOME STATEMENT:                        MARCH 31, 1998              MARCH 31, 1997
----------------                         --------------              --------------           
                                     (DOLLARS IN THOUSANDS)      (DOLLARS IN THOUSANDS)
Fee income.........................           $7,448                      $5,346
Personnel costs, net...............           $5,229                      $2,950
General office and administrative..           $1,527                      $  967
Net income.........................           $1,117                      $1,290
</TABLE>

7.   SUPPLEMENTAL DISCLOSURE OF NON-CASH FINANCING ACTIVITIES

     During the three months ended March 31, 1998, the Company declared cash
distributions totaling $17.6 million.  The distributions were paid April 17,
1998.

     On February 6, 1998, the owners of the Merged Entity (as earlier defined)
paid deferred compensation to certain Merged Entity Employees in the form of
113,500 Units.  The transaction resulted in a non-cash charge to the Company of
$2.9 million (net of the minority interest holders share of the charge of
approximately $193,000).

     In addition, during the three months ended March 31, 1998, the Company
assumed $3.9  million of mortgage debt and $1.2  million of net liabilities in
connection with the acquisition of Properties during the period.

8.   IMPACT OF THE YEAR 2000 ISSUE

     The Year 2000 issue is the result of computer programs being written using
two digits rather than four to define the applicable year.  Any computer program
that has date-sensitive software may recognize a date using "00" as the year
1900 rather than the year 2000.  This could result in a system failure or
miscalculations causing disruption of operations, including, among other things,
a temporary inability to process transactions, send invoices, or engage in
similar normal business activities.

     The Company has recently assessed its internal computer systems and
believes that the current systems used will properly utilize dates beyond
December 31, 1999.  Upon the completion of various management studies, which are
expected in late 1998, the Company will determine the extent to which the
Company is vulnerable to third-parties' possible failure to remediate their own
Year 2000 issues and the potential costs associated with resolving this issue.

9.   RECENTLY ISSUED ACCOUNTING STANDARDS

     In June 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 131, "Disclosures about Segments
of an Enterprise and Related Information" ("FAS No. 131").

                                       11
<PAGE>
 
     FAS No. 131 requires disclosure of segment data in an entity's annual
financial statements and selected segment information in their quarterly report
to shareholders.  FAS No. 131 also requires entity-wide disclosures about the
products and services an entity provides, the material countries in which it
holds assets and reports revenues, and its major customers.  FAS No. 131
supersedes FAS No. 14, "Financial Reporting for Segments of a Business
Enterprise," and is effective for fiscal years beginning after December 15,
1997.  FAS No. 131 is not required for interim reporting in the first year of
application.  Thus, FAS No. 131 will be implemented by the Company for its year-
end December 31, 1998 reporting. The Company believes that upon implementation,
FAS No. 131 will not have a material impact on the financial statements of the
Company.

     In February 1998, the FASB issued Statement of Financial Accounting
Standards No. 132, "Employers' Disclosures about Pensions and Other
Postretirement Benefits" ("FAS No. 132").

     FAS No. 132 provides additional information to facilitate financial
analysis and eliminates certain disclosures which are no longer useful.  To the
extent practicable, the Statement also standardizes disclosures for retiree
benefits.  FAS No. 132 is effective for financial statements issued for periods
ending after December 15, 1997.  The Company believes that FAS No. 132 will not
have a material impact on the financial statements of the Company.

10.  PRO FORMA FINANCIAL INFORMATION

     Due to the Company's significant acquisition activity between January 1,
1997 and March 31, 1998, the historical results of operations for the periods
presented may not be indicative of future results of operations.  The following
Pro Forma Condensed Statements of Income for the three months ended March 31,
1998 and 1997 are presented as if the acquisitions and related transactions
occurred on January 1, 1997.  The pro forma information is based upon historical
information and does not purport to present what actual results would have been
had such transactions, in fact, occurred January 1, 1997, or to project results
for any future period.

                    PRO FORMA CONDENSED STATEMENTS OF INCOME

<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED     THREE MONTHS ENDED
                                                                  MARCH 31, 1998         MARCH 31, 1997
                                                                ------------------     ------------------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                             <C>                    <C>
Total revenues.......................................                  57,509                  55,050
Property operating and maintenance...................                  13,157                  12,798
Real estate taxes....................................                   5,742                   5,197
General and administrative...........................                     784                     554
Personnel costs, net.................................                   1,088                     709
Interest expense.....................................                  10,342                  10,342
Amortization of deferred financing costs.............                     196                     196
Depreciation and amortization........................                   9,461                   9,461
Equity in income of joint venture and unconsolidated                                   
 subsidiaries........................................                   1,246                   1,419
                                                                      -------                 -------
Net income before minority interest..................                  17,985                  17,212
Minority interest....................................                    (690)                   (655)
                                                                      -------                 -------
Net income before preferred dividends................                  17,295                  16,557
Preferred dividends..................................                  (1,509)                 (1,509)
                                                                      -------                 -------
Net income applicable to common shareholders.........                 $15,786                 $15,048
                                                                      =======                 =======
                                                                                       
Net income per Common Share - basic..................                   $0.40                   $0.38
                                                                      =======                 =======
Net income per Common Share - diluted................                   $0.39                   $0.37
                                                                      =======                 =======
</TABLE>
                                                                                

                                       12
<PAGE>
 
11.  EARNINGS PER SHARE

     The Company calculates Earnings per Share in accordance with Statement of
Financial Accounting Standards No. 128, "Earnings per Share" ("FAS No. 128").
FAS No. 128 requires a dual presentation of basic and diluted Earnings per Share
on the face of the income statements.  Additionally, FAS No. 128 requires a
reconciliation of the numerator and denominator used in computing basic and
diluted Earnings per Share.

<TABLE>
<CAPTION>
Reconciliation of Earnings per Share Numerator                 THREE MONTHS ENDED         THREE MONTHS ENDED
                                                                 MARCH 31, 1998             MARCH 31, 1997
                                                               ------------------         ------------------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                            <C>                        <C>
Net Income................................................           $ 9,496                    $ 7,080
Preferred Dividends.......................................            (1,136)                         -
                                                                     -------                    -------
Net Income Available to Common Shareholders...............           $ 8,360                    $ 7,080
                                                                     =======                    =======
Reconciliation of Earnings per Share Denominator                     
                                                                     
Weighted Average Common Shares Outstanding................            36,716                     20,280
                                                                     =======                    =======
                                                                     
Basic Earnings per Share..................................           $  0.23                    $  0.35
                                                                     =======                    =======
                                                                     
Dilutive Effect of Common Share Equivalents                          
                                                                     
Options...................................................               389                        372
Weighted Average Common Shares Outstanding................            36,716                     20,280
                                                                     -------                    -------
Weighted Average Common Shares and Common Share                      
   Equivalents............................................            37,105                     20,652
                                                                     =======                    =======
                                                                     
Diluted Earnings Per Share................................           $  0.23                    $  0.34
                                                                     =======                    =======
</TABLE>

12.  SUBSEQUENT EVENTS

     The Company has agreements to acquire four office properties (the
"Contracted Properties") in the near future.  The agreements relating to the
Contracted Properties are subject to customary closing conditions; therefore,
there can be no assurances that the Company will acquire all of the Contracted
Properties.

     On April 2, 1998, the Company filed, with the SEC, a registration statement
with respect to the registration of 6,025,938 Common Shares of Beneficial
Interest, par value $0.01 per share.

     On April 3, 1998, the Company filed with the SEC a registration statement
on Form S-3 with respect to the registration of $1.0 billion of Common Shares of
Beneficial Interest, par value $0.01, or Preferred Shares of Beneficial
Interest, par value $0.01, to be offered for sale from time to time by the
Company.

     On April 24, 1998, the Company acquired two Class "A" office properties
containing 52,665 square feet located in the suburban Philadelphia,
Pennsylvania, area.  The purchase price of the properties, excluding closing
costs, totaled approximately $5.3 million.

                                       13
<PAGE>
 
ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS

This Form 10-Q may include forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933 and Section 21E of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"). These statements are
identified by phrases such as the Company "expects" or "anticipates" and words
of similar effect. The Company's actual results may differ materially from those
projected. Factors that could cause such a difference include: the Company's
inability or failure to acquire properties under contract or additional
properties; difficulties in integrating and operating acquired properties;
bankruptcy or default of major tenants resulting in a failure or delay in
payment of rent; and general risks associated with investments in real estate,
including the effect of changes in economic, competitive and other market
conditions in the markets where the Company's properties are concentrated, non-
renewal of expiring leases or inability to re-let vacated space at adequate
rates, the inability of properties to generate adequate cash flow to fund debt
service and operating expenses, financing and refinancing risks related to the
Company's floating rate debt and new debt necessary to support growth. For
additional information, please refer to the detailed discussion of risks
included in the Company's Exchange Act filings under the caption "Risk Factors."

OVERVIEW

     The Company is a self-administered and self-managed Real Estate Investment
Trust ("REIT") that acquires, owns, manages, leases, develops and builds office
and industrial properties throughout the United States.  The Company operates
principally through Prentiss Properties Acquisition Partners, L.P. and its
subsidiaries (the "Operating Partnership") and Prentiss Properties Limited, Inc.
(the "Manager") (collectively referred to herein as the "Company").

RESULTS OF OPERATIONS

     As of March 31, 1998, the Company owned interests in a diversified
portfolio of 229 primarily suburban Class "A" office and suburban industrial
properties (the "Properties") containing approximately 19.8 million net rentable
square feet.  The Properties are located in 19 major U.S. markets and consist of
98 office buildings (the "Office Properties") containing approximately 10.4
million net rentable square feet and 131 industrial buildings (the "Industrial
Properties") containing approximately 9.4 million net rentable square feet.  The
Properties include seven office and three industrial development projects,
including one expansion of an existing Property, totaling approximately 1.3
million square feet.

     The consolidated financial statements of the Company include all the
accounts of the Company, its majority-owned Operating Partnership and
subsidiaries.  The financial statements for the three months ended March 31,
1998, include (i) the results of operations of 154 operating Properties and 8
development projects for the entire period presented, (ii) the results of
operations of the 59 Acquired Properties and 1 development project for the
portion of the period subsequent to acquisition or commencement of development
by the Company, (iii) the results of operations of the 5307 East Mockingbird
property for the portion of the period before the Company sold the property in
March 1998, (iv) a 50% equity interest in the 7 Broadmoor Austin Properties, and
(v) results of operations of the Prentiss Properties Service Business conducted
primarily by the Manager in the period presented.  The financial statements for
the three months ended March 31, 1997, include (i) the results of operations of
88 operating Properties (inclusive of the 5307 East Mockingbird property) and 3
development projects for the entire period presented, (ii) the results of
operations of 7 Properties acquired during the period for the portion of the
period subsequent to acquisition by the Company, (iii) an approximate 50% equity
interest in the 7 Broadmoor Austin Properties, and (iv) results of operations of
the Prentiss Properties Service Business conducted primarily by the Manager in
the period presented.  All significant intercompany balances and transactions
have been eliminated.

     The results of operations for the periods ended March 31, 1998 and 1997
include the respective operations of the Company.  Consequently, the comparisons
of the periods provide only limited information regarding the operations of the
Company as currently constituted.

Comparison of Three Months Ended March 31, 1998 to the Three Months Ended March
31, 1997

     Rental income increased by $28.0 million, or 127.4%, to $50.0 million from
$22.0 million primarily as a result of the Properties acquired subsequent to
March 31, 1997.  As described above, the Company includes comparative results of
operations of 87 operating Properties and the 5307 East Mockingbird property for
the three month periods ended March 31, 1998 and 1997.  The rental income for
the combined 87 operating Properties increased by $1.4 million, or 6.4%, from
the three months ended March 31, 1997 to the three months ended March 

                                       14
<PAGE>
 
31, 1998. Rental income at the 5307 East Mockingbird property, sold in March
1998, and the significant Property acquisitions subsequent to March 31, 1997
account for a $26.7 million increase in rental income.

     Property operating and maintenance expenses increased by $6.2 million, or
116.4%, primarily as a result of the Properties acquired subsequent to March 31,
1997.  The property operating and maintenance expenses for the 87 operating
Properties increased by approximately $126,000, or 2.1%, from the three month
period ended March 31, 1997 to the three month period ended March 31, 1998.
Property operating and maintenance expenses of the 5307 East Mockingbird
property and the significant Property acquisitions subsequent to March 31, 1997
accounted for an approximate $6.1 million increase from the three month period
ended March 31, 1997 to the same period in 1998.

     Real estate taxes increased by $2.8 million, or 114.7%, primarily as a
result of the Properties acquired subsequent to March 31, 1997.  Such acquired
Properties, when combined with the 5307 East Mockingbird property, account for a
$2.4 million increase in real estate expenses for the three month period ended
March 31, 1998 compared to the prior year comparative period.  The real estate
tax expense for the 87 operating Properties increased by approximately $420,000,
or 17.3%, from the three months ended March 31, 1997 to the comparative period
in 1998.

     Interest expense increased by $5.5 million, or 207.0%, primarily as a
result of the increase in debt on real estate from $201.4 million at March 31,
1997 to $460.0 million at March 31, 1998.  The increase in debt service is
attributable to borrowings incurred and assumed in connection with the
significant Property acquisitions subsequent to March 31, 1997.

     Depreciation and amortization expense increased by $4.7 million, or 122.0%,
primarily as a result of the Properties acquired subsequent to March 31, 1997.
Such acquired Properties, when combined with the 5307 East Mockingbird property,
account for a $4.1 million increase in depreciation and amortization for the
three months ended March 31, 1998 from the prior year comparative period.  The
depreciation and amortization expense for the 87 operating Properties increased
by approximately $558,000, or 15.1%, from the three months ended March 31, 1997
to the comparative period in 1998.

     During the three months ended March 31, 1998, the Company recorded a gain
on sale of $2.6 million and extraordinary item of $8.9 million.  The gain on
sale resulted from the Company's sale of the 5307 East Mockingbird property in
March 1998.  The extraordinary item resulted from two items including (i) the
Company's recognition of its 50% proportionate share of $12.9 million, or $6.45
million, of prepayment penalties and unamortized financing costs written-off,
both of which were recorded as extraordinary charges by the Broadmoor Austin
joint venture during the period; and (ii) the distribution of 113,500 Operating
Partnership units ("Units") by an affiliate of the Company to certain employees
of the Company resulting in a non-cash charge to the Company of $3.1 million.
The transactions were recorded net of the minority interest proportionate share
of each charge totaling $406,000 and $193,000, respectively.

Funds from Operations

     The Company generally considers Funds from Operations, in conjunction with
cash flows, to be an appropriate measure of liquidity of an equity REIT.  "Funds
from Operations" as defined by the National Association of Real Estate
Investment Trusts ("NAREIT") means net income (computed in accordance with
Generally Accepted Accounting Principles ("GAAP")) excluding gains (or losses)
from debt restructuring and sale of property, plus depreciation and amortization
on real estate assets, and after adjustments for unconsolidated partnerships and
joint ventures.  The Company's Funds from Operations may not be comparable to
Funds from Operations reported by other REITs that do not define that term using
the current NAREIT definition.  Funds from Operations does not represent cash
generated from operating activities in accordance with GAAP and should not be
considered as an alternative to net income as an indication of the Company's
performance or to cash flows as a measure of liquidity or ability to make
distributions.  The following is a reconciliation of net income to Funds from
Operations for the three month periods ended March 31, 1998 and 1997:

                                       15
<PAGE>
 
<TABLE>
<CAPTION>
                                                                     THREE MONTHS             THREE MONTHS
                                                                        ENDED                     ENDED
                                                                    MARCH 31, 1998           MARCH 31, 1997
                                                                    --------------           --------------
                                                                (DOLLARS IN THOUSANDS)   (DOLLARS IN THOUSANDS)
<S>                                                             <C>                      <C>
 
Net income                                                             $ 9,496                   $ 7,080
                                                                       
Add:                                                                   
  Real estate depreciation and amortization..................            8,515                     3,835
  Real estate depreciation and amortization of                         
     unconsolidated joint ventures...........................              573                       542
  Minority interest in operating partnership.................            1,239                     1,164
  Extraordinary item.........................................            8,908                       111
Less:                                                                  
  Gain on sale...............................................           (2,555)                        -
                                                                       -------                   -------
                                                                       
Funds from Operations                                                  $26,176                   $12,732
                                                                       =======                   =======
</TABLE>

Liquidity and Capital Resources

     Cash and cash equivalents were $10.4 million and $31.9 million at March 31,
1998 and March 31, 1997, respectively.  Net cash provided by operating
activities was $17.1 million for the three months ended March 31, 1998, compared
to $4.7 million for the three months ended March 31, 1997. The increase is due
primarily to the operating results of the Properties acquired subsequent to
March 31, 1997.

     Net cash used in investing activities increased from $45.3 million for the
three months ended March 31, 1997 to $167.1 million for the three months ended
March 31, 1998.  This increase is due primarily to the 59 real estate Properties
acquired during the three months ended March 31, 1998 compared to 7 acquired
during the same period in 1997, as well as an increase in cash invested in real
estate due to an increase in the number of development projects from 3 in this
period of 1997 to 10 in 1998.

     Net cash provided by financing activities increased from $65.3 million for
the three months ended March 31, 1997 to $153.3 million for the three months
ended March 31, 1998. This increase is primarily attributable to the net
proceeds from the sale of common shares of beneficial interest, $0.01 par value
per share ("Common Shares") and Series "A" Cumulative Convertible Redeemable
Preferred Shares ("Series A Convertible Preferred Shares") during the three
months ended March 31, 1998.

The following table sets forth the Company's mortgage debt as of March 31, 1998:

                                 MORTGAGE DEBT
<TABLE>
<CAPTION>
                                                                                                          ANNUAL 
                   PROPERTY(IES)        PRINCIPAL        INTEREST                                        INTEREST 
                   -------------          AMOUNT           RATE      AMORTIZATION       MATURITY          PAYMENT
                                        ---------        --------    ------------       --------         --------
<S>                                   <C>                <C>         <C>           <C>                 <C>
Mortgage Loan........................ $180,100,000(1)      7.58%         None      February 27, 2007   $13,651,580
Acquisition Loan.....................  120,000,000(2)      7.46%(3)      None      August 1, 1998        8,952,000
Line of Credit.......................    5,000,000         7.03%(4)      None      December 31,2001        351,500
PacifiCare Building (FHP)............    6,000,000         7.30%         None      November 1, 2000        438,000
Walnut Glen Tower....................   35,000,000         6.92%         None      April 1, 2005         2,422,000
Crescent Centre......................   12,000,000         7.95%         None      March 1, 2004           954,000
Bachman Creek - West.................    3,050,000         8.63%        25 yr      November 30, 2002       263,215
Broadmoor Austin Properties(5).......   77,000,000         7.04%         None      April 10, 2011        5,420,800
Southpoint (III).....................    8,138,000         7.75%        20 yr      April 14, 2014          630,695
CIGNA Loan (6).......................   60,000,000         6.80%         None      December 10, 2003     4,080,000
Highland Court.......................    5,097,000         7.27%        25 yr      April 1, 2006           370,552
Creamery Way.........................    3,882,421         8.30%        20 yr      September 19, 2006      322,241
2500 Cumberland Building K...........    8,073,619         7.41%(7)      None      August 1, 2000          598,255
Exec. Center Del Mar.................    6,586,655         7.31%(8)      None      December 14, 2000       481,484
Westpoint............................    7,081,160         7.31%(8)      None      November 15,  2000      517,633
                                      ------------         ----                                        -----------
                                                                                                       
Total/Weighted Average............... $537,008,855         7.35%                                       $39,453,955
                                      ============         ====                                        ===========
</TABLE>

                                       16
<PAGE>
 
(1)  The Mortgage Loan is collateralized by the following 53 Properties: Park
     West E1, Park West E2, One Northwestern Plaza, 3141 Fairview Park Drive,
     O'Hare Plaza II, 1717 Deerfield, 2411 Dulles Corner Road, 4401 Fair Lakes
     Court, Kansas City Industrial Properties (7 Properties), certain of the Los
     Angeles Industrial Properties (18 Properties), certain of the Milwaukee
     Industrial Properties (17 Properties), and the certain of the Chicago
     Industrial Properties (3 Properties).
(2)  The Acquisition Loan is collateralized by the following 16 Properties:
     Natomas Corporate Center (6 Properties), The Academy (3 Properties), Seven
     Mile Crossing (2 Properties), and Corporetum Office Campus (5 Properties).
(3)  Represents the weighted average interest rate for the Interest Rate Swap of
     $50 million at an effective rate of 7.503% and $60 million at an effective
     rate of 7.498%.  Additionally, rate shown reflects a variable rate on $10
     million equal to LIBOR + 1.25%; on May 6, 1998, LIBOR was equal to 5.66%.
(4)  Represents a variable rate equal to LIBOR + 1.38%; on May 6, 1998, LIBOR
     was equal to 5.66%.
(5)  The Company, through the Operating Partnership, owns a 50% general
     partnership interest in the entity that owns the Broadmoor Austin
     Properties, which interest is accounted for under the equity method of
     accounting.  The amount shown reflects the Company's proportionate share of
     the mortgage indebtedness collateralized by the Properties.
(6)  The CIGNA Loan is collateralized by the following 11 Properties: Lake
     Center (2 Properties), Southpoint I and II (2 Properties), Valleybrooke (5
     Properties) and Woodland Falls I and IV (2 Properties).
(7)  Represents a variable rate equal to LIBOR + 1.75%; on May 6, 1998, LIBOR
     was equal to 5.66%.
(8)  Represents a variable rate equal to LIBOR + 1.65%; on May 6, 1998, LIBOR
     was equal to 5.66%.

     The Company's policy is to limit combined indebtedness plus its pro rata
share of joint venture debt so that at the time such debt is incurred, it does
not exceed 50% of the Company's total market capitalization (the "Debt
Limitation"). As of March 31, 1998, the Company had outstanding total
indebtedness, including its pro rata share of joint venture debt of
approximately $537.0 million, or approximately 31.28% of total market
capitalization based on a Common Share price of $26.125 per share. As of March
31, 1998, the Company had the approximate capacity to borrow up to an additional
$642.6 million under the Debt Limitation. The amount of indebtedness that the
Company may incur, and the policies with respect thereto, are not limited by the
Company's Declaration of Trust and Bylaws, and are solely within the discretion
of the Company's Board of Trustees.

     The Company's Properties require periodic investments of capital for
tenant-related capital expenditures and for general capital improvements.  For
the three months ended March 31, 1998, the Company's recurring non-incremental
revenue-generating capital expenditures totaled $1.7 million.

     The Company has considered its short-term liquidity needs and the adequacy
of adjusted estimated cash flows and other expected liquidity sources to meet
these needs. The Company believes that its principal short-term liquidity needs
are to fund normal recurring expenses, debt service requirements and the minimum
distribution required to maintain the Company's REIT qualification under the
Code. The Company anticipates that these needs will be fully funded from the
Company's cash flows provided by operating activities and, when necessary to
fund shortfalls resulting from the timing of collections of accounts receivable
in the ordinary course of business, from the Line of Credit, leasing development
and construction business and from the Manager.  The Manager's sole sources of
income are fees generated by its office and industrial real estate management,
leasing, development and construction business.

     The Company has agreements to acquire four office properties (the
"Contracted Properties") in the near future.  The agreements relating to the
Contracted Properties are subject to customary closing conditions; therefore,
there can be no assurances that the Company will acquire all of the Contracted
Properties.  In addition to the Contracted Properties, on April 24, 1998, the
Company acquired two Class "A" office properties (the "Recently Acquired
Properties") containing 52,665 square feet located in the suburban Philadelphia,
Pennsylvania, area.  Subsequent to the closing of the Recently Acquired
Properties and upon the completion of the acquisition of the Contracted
Properties, the Company expects to have approximately $664.1 million of mortgage
indebtedness outstanding, including its pro rata share of joint venture debt.

     The Company expects to meet its long-term liquidity requirements for the
funding of activities such as development, property acquisitions, scheduled debt
maturities, major renovations, expansions and other non-recurring capital
improvements through long-term secured and unsecured indebtedness and the
issuance of additional equity securities from the Company.  The Company also
intends to use proceeds from the Line of Credit to fund property acquisitions,
development, redevelopment, expansions and capital improvements on an interim
basis.

     The Company expects to make distributions to its shareholders primarily
based on its distributions from the Operating Partnership.  The Operating
Partnership's income will be derived primarily from lease revenues from the
Properties and, to a limited extent, from fees generated by its office and
industrial real estate management properties.

     The operating partnership and the Company entered into a Purchase
Agreement, dated February 2, 1998, with UBS Limited and Union Bank of
Switzerland, London Branch, acting through its agent UBS Securities LLC (all as
succeeded by UBS, AG, London Branch, acting through its agent Warburg Dillon
Read LLC, "UBS-LB") involving the sale of 1,100,000 Common Shares (the "UBS
Purchase Agreement"). The operating partnership and the Company also entered
into a related forward stock contract, dated February 2, 1998, with UBS-LB (the
"UBS Forward Agreement"), which provides for certain purchase price adjustments.
The maturity date of the UBS Forward Agreement is February 2, 1999, subject to
acceleration as described more fully below.

     The UBS Forward Agreement generally provides that if the market price of a
Common Share on the maturity date is less than a certain amount (the "Forward
Price"), the Company must pay UBS-LB the difference multiplied by 1,100,000.
Similarly, if the market price of a Common Share is above the Forward Price, 
UBS-LB must pay the Company the difference in Common Shares. If the Company
chooses not to, or if the Company cannot, settle in freely tradable Common
Shares, the Company must repurchase the 1,100,000 shares at the Forward Price in
cash. Over the life of the UBS Forward Agreement, the Forward Price will be
adjusted by LIBOR plus 135 basis points, minus any dividends received on the
Common Shares.
    
     To secure the Company's obligations under the UBS Forward Agreement, the
UBS Forward Agreement provides for quarterly payments of collateral equal to
1,100,000 times 105% of the amount by which the market price of a Common Share
is below the Forward Price. The collateral may be in the form of cash, letters
of credit or freely tradable Common Shares. As of the last recalculation date of
the Forward Price, which was April 30, 1998, the Forward Price was $27.055 per
share. Based on the then current share price of $25.313, this resulted in a
collateral requirement of approximately $1.9 million. The Company has secured
this requirement entirely with cash and letters of credit.     
    
     Although maturity date of the UBS Forward Agreement is February 2, 1999; if
the closing price of the Common Shares falls below $16.40 for a period of three
consecutive trading days, or if the market value of Common Shares, excluding
operating partnership units, declines to or below $600 million, UBS-LB has the
right to force a complete settlement under the UBS Forward Agreement, if the
closing price of the Common Shares falls below $18.50 for a period of three
consecutive trading days, UBS-LB has the right to force a settlement with
respect to 67% of the Transaction. UBS-LB also has the right to force a complete
settlement under the UBS Forward Agreement if the Company:    

 . is in default with respect to certain financial covenants under the UBS
  Forward Agreement,
 . is in default under its credit facility with a syndicate of lenders or any
  other unsecured lending agreement, or
 . fails to post sufficient cash collateral.
    
     Settlement in cash would involve the repurchase of 1,100,000 shares at a
price per share equal to the Forward Price. Assuming the Forward Price remains
at $27.055, the Company's repurchase price would total approximately
$29.8 million. If the Company settled the UBS Forward Agreement in cash, the
Company would expect to use borrowings under the Company's existing $300 million
corporate revolver or various secured borrowings which the Company is currently
negotiating.    

     Quarterly payments of collateral and the ultimate settlement of the UBS
Forward Agreement could adversely affect the Company's liquidity or dilute the
Company's Common Shares. If the market price is lower than the Forward Price,
settlement in Common Shares would dilute the Company's capital stock. The table
below shows the change in the value of a Common Share as a result of settling
the UBS Forward Agreement at various Market Prices:
    
                                          INCREASE/(DILUTION) IN VALUE
     MARKET PRICE                             OF COMMON SHARES (1)
     ------------                           -----------------------

         $30                                         0.27%
         $25                                        (0.23%)
         $20                                        (0.97%)
         $15                                        (2.22%)
         $10                                        (4.71%)
     
--------------------
    
(1)  Assumes a Forward Price of $27.055.     

                                       17

<PAGE>
 
Inflation

     Most of the leases on the Properties require tenants to pay increases in
operating expenses, including common area charges and real estate taxes, thereby
reducing the impact on the Company of the adverse effects of inflation.  Leases
also vary in term from one month to 15 years, further reducing the impact on the
Company of the adverse effects of inflation.

Impact of the Year 2000 Issue

     The Year 2000 issue is the result of computer programs being written using
two digits rather than four to define the applicable year.  Any computer program
that has date-sensitive software may recognize a date using "00" as the year
1900 rather than the year 2000.  This could result in a system failure or
miscalculations causing disruption of operations, including, among other things,
a temporary inability to process transactions, send invoices, or engage in
similar normal business activities.

     The Company has recently assessed its internal computer systems and
believes that the current systems used will properly utilize dates beyond
December 31, 1999.  Upon the completion of various management studies, which are
expected in late 1998, the Company will determine the extent to which the
Company is vulnerable to third-parties' possible failure to remediate their own
Year 2000 issues and the potential costs associated with resolving this issue.

Recently Issued Accounting Standards

     In June 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 131, "Disclosures about Segments
of an Enterprise and Related Information" ("FAS No. 131").

     FAS No. 131 requires disclosure of segment data in an entity's annual
financial statements and selected segment information in their quarterly report
to shareholders.  FAS No. 131 also requires entity-wide disclosures about the
products and services an entity provides, the material countries in which it
holds assets and reports revenues, and its major customers.  FAS No. 131
supersedes FAS No. 14, "Financial Reporting for Segments of a Business
Enterprise," and is effective for fiscal years beginning after December 15,
1997.  FAS No. 131 is not required for interim reporting in the first year of
application.  Thus, FAS No. 131 will be implemented by the Company for its year-
end December 31, 1998 reporting. The Company believes that upon implementation,
FAS No. 131 will not have a material impact on the financial statements of the
Company.

     In February 1998, the FASB issued Statement of Financial Accounting
Standards No. 132, "Employers' Disclosures about Pensions and Other
Postretirement Benefits" ("FAS No. 132").

     FAS No. 132 provides additional information to facilitate financial
analysis and eliminates certain disclosures which are no longer useful.  To the
extent practicable, the Statement also standardizes disclosures for retiree
benefits.  FAS No. 132 is effective for financial statements issued for periods
ending after December 15, 1997.  The Company believes that FAS No. 132 will not
have a material impact on the financial statements of the Company.

ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not applicable.

                                       18
<PAGE>
 
                          PART II:  OTHER INFORMATION
                          ---------------------------
                                        

ITEM 1.   LEGAL PROCEEDINGS

None.

ITEM 2.   CHANGES IN SECURITIES

     On February 2, 1998, the Company closed a direct placement of 1.1 million
common shares of beneficial interest, $0.01 par value per share ("Common
Shares") to an affiliate of Union Bank of Switzerland ("UBS") for gross
consideration of $29.7 million or $27.00 per share.  In a related transaction,
the Company entered into a forward stock contract with UBS which provides that
during the first year after the closing of the direct placement, the Company
will have the right to periodically consummate a share settlement with UBS based
on the then market price of the Company's Common Shares.  Alternatively, the
Company, at its option, may complete such settlement for cash consideration.
The net proceeds from the sale to UBS and its affiliates were contributed to the
Operating Partnership in exchange for Operating Partnership units ("Units").
The sales to UBS and its affiliates were exempt from registration under the
Securities Act pursuant to Section 4(2) thereof.

     On February 17, 1998, the Company filed a Form 8-A (file no. 000-23813) as
amended on March 10, 1998 and incorporated by reference herein, disclosing the
approval by the Company's Board of Trustees on February 6, 1998, of the
Company's Preferred Share Purchase Rights and the distribution of such rights to
holders of record of Common Shares as of the close of business on February 17,
1998.

ITEM 3.   DEFAULTS UPON MORTGAGES AND NOTES PAYABLE

None.

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.

ITEM 5.   OTHER INFORMATION

Not applicable.

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

(a)  Exhibits:

     Unless otherwise indicated, the exhibits listed below are filed as part of
     this report or incorporated by reference * to the Company's Registration
     Statement on Form S-11, File No. 333-9863 (the "Registration Statement").

 
EXHIBIT NO.                        Description
-----------                        -----------
    3.1*  -- Form of Amended and Restated Declaration of Trust of the Registrant
    3.2*  -- Bylaws of the Registrant
    3.3   -- Articles Supplementary, dated December 18, 1997, Classifying and
             Designating a Series of Preferred Shares of Beneficial Interest as
             Series A Cumulative Convertible Redeemable Preferred Shares of
             Beneficial Interest and Fixing Distribution and Other Preferences
             and Rights of Such Shares (filed as Exhibit 3.1 to the Company's
             Current Report on Form 8-K, filed January 15, 1998, SEC File No.
             001-14516)
    3.4  --  Articles Supplementary, dated February 17, 1998, Classifying and
             Designating a Series of Preferred Shares of Beneficial Interest as
             Junior Participating Cumulative Convertible Redeemable Preferred
             Shares of Beneficial Interest, Series B, and Fixing Distribution
             and Other Preferences and Rights of Such Shares (filed as an
             Exhibit to the Company's Registration Statement on Form 8-A filed
             on February 17, 1998, SEC File No. 000-23813)

                                       19
<PAGE>
 
    4.1*  -- Form of Common Share Certificate
    4.2   -- Rights Agreement, dated February 6, 1998, between the Company and
             First Chicago Trust Company of New York, as Rights Agent (filed as
             an Exhibit to the Company's Registration Statement on Form 8-A
             filed on February 17, 1998, SEC File No.000-23813)
    4.3  --  Form of Rights Certificate (included as Exhibit A to the Rights
             Agreement [Exhibit 4.2])
   27.1  --  Financial Data Schedule

(b)  Reports on Form 8-K

     The Company filed a Current Report on Form 8-K on January 15, 1998 to
include in its filings under the Securities Exchange Act of 1934, as amended,
under Item 5, its agreement to sell 3,773,585 Series "A" Cumulative Convertible
Redeemable Preferred Shares ("Series A Convertible Preferred Shares") to
Security Capital Preferred Growth Incorporated ("SCPG"), at $26.50 per share for
total proceeds of $100.0 million and certain Item 7 Exhibits including (i)
certain information regarding the sale of the Series A Convertible Preferred
Shares; and (ii) the First Amendment, dated December 29, 1997, to the Second
Amended and Restated Agreement of Limited Partnership of Prentiss Properties
Acquisition Partners, L.P.

     The Company filed a Current Report on Form 8-K on February 10, 1998 (i) to
report under Item 2 the completion of the acquisition of certain significant
Properties, (ii) to report under Item 5 the completion of the acquisition of
certain insignificant Properties, and (iii) to file financial statements with
respect to the significant acquisitions reported under Item 2 and insignificant
acquisitions reported under Item 5.

     The Company filed a Current Report on Form 8-K on February 17, 1998, to
report under Item 5 two public offerings of 922,676 and 893,330 Common Shares
underwritten by Prudential Securities Incorporated and Smith Barney Inc.,
respectively on a firm commitment basis, and to file as Item 7 Exhibits the
Underwriting Agreements between the Company, Prentiss Properties Acquisition
Partners, L.P., Prentiss Properties I, Inc. and Prudential Securities
Incorporated and Smith Barney Inc., respectively, dated February 12, 1998, and
two Form Tax Opinions of Hunton & Williams addressed to Prudential Securities
Incorporated and Smith Barney Inc., respectively.

     The Company filed a Current Report on Form 8-K on February 25, 1998, to
report under Item 5 a public offering of 1,198,157 Common Shares underwritten by
A.G. Edwards & Sons, Inc., on a firm commitment basis, and to file as Item 7
Exhibits the Underwriting Agreement between the Company, Prentiss Properties
Acquisition Partners, L.P., Prentiss Properties I, Inc. and A.G. Edwards & Sons,
Inc., dated February 18, 1998, and a Form Tax Opinion of Hunton & Williams
addressed to A.G. Edwards & Sons, Inc.

                                       20
<PAGE>
 
                                   SIGNATURE
                                   ---------
                                        

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


                              PRENTISS PROPERTIES TRUST


   
Date:  December 24, 1998          By: /s/ Thomas P. Simon
                                  ------------------------------------------
                                  Thomas P. Simon
                                  (Vice President and Chief Accounting Officer)

                                       21