PS BUSINESS PARKS INC/CA
8-K, 1998-05-14
REAL ESTATE INVESTMENT TRUSTS
Previous: CELADON GROUP INC, 10-Q, 1998-05-14
Next: KLEVER MARKETING INC, 10QSB, 1998-05-14



                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-K

 Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act 
                                    of 1934


          Date of Report (Date of earliest event reported) May 4, 1998





                             PS BUSINESS PARKS, INC.
             (Exact name of registrant as specified in its charter)


          California                    1-10709                     95-4300881
          ----------                    -------                     ----------
(State or Other Jurisdiction    (Commission File Number)         I.R.S. Employer
      of Incorporation)                                   Identification Number)


               701 Western Avenue, Glendale, California 91201-2397
               ---------------------------------------------------
               (Address of principal executive offices) (Zip Code)


       Registrant's telephone number, including area code: (818) 244-8080


                                       N/A
          (Former name or former address, if changed since last report)

<PAGE>
ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS

     On May 4, 1998, PS Business Parks,  Inc. (the "Company" or "PSB"),  through
     its consolidated partnerships, acquired 28 commercial properties located in
     Texas and Oregon,  containing  approximately  2,265,000 net rentable square
     feet,  and  approximately  15 acres  of  vacant  land  from  affiliates  of
     Principal  Mutual  Life at an  aggregate  purchase  price of  approximately
     $190.5  million.  The  Company is not  affiliated  with the sellers and the
     purchase  price was  established  through  arm's  length  negotiation.  The
     Company  obtained the funds to acquire the  facilities  through a loan from
     Public  Storage,  Inc.,  an affiliate of the Company,  bearing  interest at
     LIBOR plus 1.25%  (currently  6.9%)and  maturing on December 31, 1998.  The
     Company has repaid a portion of the loan from a recently  completed sale of
     Common Stock and the Company expects to repay the balance through a private
     sale of securities.

     The following table provides certain information  concerning the facilities
     acquired:
<TABLE>
<CAPTION>
                                                                              Net Rentable         Occupancy
                                     Property Type       Purchase Price      Square Footage    at March 31, 1998
                                     -------------       --------------      --------------    -----------------
       <S>                           <C>               <C>                      <C>                 <C> 
        Beaverton, Oregon              Industrial       $  15,946,000            131,000             100%
                                         & Office
        Beaverton, Oregon              Industrial           5,234,200             43,000              83%
                                         & Office
        Beaverton, Oregon              Industrial           6,609,700             54,300             100%
                                         & Office
        Beaverton, Oregon              Industrial          10,456,200             85,900             100%
                                         & Office
        Beaverton, Oregon              Industrial          11,454,400             94,100             100%
                                         & Office
        Beaverton, Oregon              Industrial          15,230,100            155,800             100%
                                         & Office
        Beaverton, Oregon              Industrial           3,225,900             33,000             100%
                                         & Office
        Beaverton, Oregon              Industrial           1,974,600             20,200             100%
                                         & Office
        Beaverton, Oregon              Industrial           5,317,800             54,400             100%
                                         & Office
        Beaverton, Oregon              Industrial           5,298,300             54,200             100%
                                         & Office
        Beaverton, Oregon                Office             4,477,200             45,800              98%
        Beaverton, Oregon              Industrial           7,351,100             75,200             100%
                                         & Office
        Beaverton, Oregon              Industrial          11,525,300            117,900             100%
                                         & Office
        Beaverton, Oregon              Industrial           3,509,400             35,900              94%
                                         & Office
        Richardson, Texas              Industrial           4,510,300            116,800              88%
                                         & Office
        Plano, Texas                   Industrial           8,636,100            184,800             100%
                                         & Office
        Dallas, Texas                  Industrial           7,100,000            193,300              85%
                                         & Office
        Dallas, Texas                  Industrial           1,766,600             44,600              81%
                                         & Office
        Irving, Texas                  Industrial           2,716,000             35,000             100%
                                         & Office
        Irving, Texas                  Industrial           4,368,800             56,300             100%
                                         & Office
        Irving, Texas                  Industrial           3,360,000             43,300              99%
                                         & Office
        Irving, Texas                  Industrial           1,714,900             22,100             100%
                                         & Office
        Irving, Texas                  Industrial          17,940,900            231,200             100%
        Irving, Texas                  Industrial           5,424,100             69,900             100%
                                         & Office
        Irving, Texas                  Industrial           2,599,600             33,500             100%
                                         & Office
        Irving, Texas                  Industrial           6,409,700             82,600             100%
                                         & Office
        Irving, Texas(1)               Industrial           3,802,400             49,000             100%
                                         & Office
        Irving, Texas(2)               Industrial           7,930,600            102,200             100%
                                         & Office
        Subtotal - operating                          --------------------  ----------------  -------------------
        facilities                                        185,890,200          2,265,300              97%
        Vacant land - Beaverton,
        Oregon (approx. 15 acres)                           4,634,800                  -               -
        Totals                                        ====================  ================  ===================
                                                        $ 190,525,000          2,265,300              97%

          (1)  Property development  completed in 1997; first occupancy occurred
               in July 1997 and property fully occupied in December 1997.
          (2)  Property  development  completed in 1998; property was pre-leased
               with  leases   covering  100%  of  the  rentable  square  footage
               commencing in first quarter of 1998.
</TABLE>

     Reference is made to Item 7 for the financial  statements of the facilities
     acquired for the year ended December 31, 1997.

                                       2
<PAGE>

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

         (a)(iii) Financial Statements specified by Rule 3.14 of Regulation S-X

                  Report of Independent Auditors

                  Combined Statement of Revenues and Certain Operating Expenses 
                     for the Year Ended December 31, 1997

                  Notes to Consolidated Financial Statements

         (b)      Pro forma Consolidated Financial Statements

         (c)      Exhibits

         10.1     Real Estate  Purchase and Sale Agreement by and between Petula
                  Associates, Ltd. and Equity FC, Ltd.  (Seller) and PS Business
                  Parks, LP (Buyer)

         10.2     Real  Estate  Purchase  and  Sale  Agreement  by  and  between
                  Principal Mutual Life Insurance Company and Petula Associates,
                  Ltd. (Seller) and PS Business Parks, LP (Buyer)

         10.3     Real  Estate  Purchase  and  Sale  Agreement  by  and  between
                  Principal  Mutual  Life  Insurance  Company (Seller)  and TPLP
                  Office Park Properties, a Texas limited partnership (Buyer)


         10.4     Real Estate  Purchase and Sale Agreement by and between Petula
                  Associates,  Ltd. (Seller) and TPLP Office Park Properties,  a
                  Texas limited partnership (Buyer)

         23.      Consent of Independent Auditors.



                                       3
<PAGE>






                                   SIGNATURES

     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 hereunto duly authorized.


                                         PS BUSINESS PARKS, INC.


     Date:  May 12, 1998             By: /s/ Ronald L. Havner, Jr.
                                         --------------------------
                                         Ronald L. Havner, Jr.
                                         President and Chief Executive Officer


                                       4
<PAGE>

Item 7 (a) (iii)


                         Report of Independent Auditors






The Board of Directors
PS Business Parks, Inc.


We have  audited the  accompanying  combined  statement  of revenues and certain
operating expenses (combined  statement) of the Principal Properties (as defined
in Note 1 to the combined  statement)  for the year ended December 31, 1997. The
combined  statement  is  the  responsibility  of  management  of  the  Principal
Properties.  Our  responsibility  is to  express  an  opinion  on  the  combined
statement based on our audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards  require that we plan and perform the audit to obtain reasonable
assurance about whether the combined statement is free of material misstatement.
An audit includes  examining,  on a test basis,  evidence supporting the amounts
and disclosures in the combined statement.  An audit also includes assessing the
accounting principles used and significant estimates made by management, as well
as evaluating the overall combined statement  presentation.  We believe that our
audit provides a reasonable basis for our opinion.

In our  opinion,  the  combined  statement  presents  fairly,  in  all  material
respects,  the combined revenues and certain operating expenses of the Principal
Properties  for the year ended  December 31, 1997, in conformity  with generally
accepted accounting principles.



                                                          /s/ ERNST & YOUNG LLP


Des Moines, Iowa
April 21, 1998


                                       5
<PAGE>


                              Principal Properties

                         Combined Statement of Revenues
                         and Certain Operating Expenses

                          Year ended December 31, 1997




Revenues:
   Rental income                                                 $17,111,000
   Reimbursement of expenses by tenants                            2,750,000
                                                            -------------------
                                                                  19,861,000

Certain operating expenses:
   Repairs and maintenance                                         1,175,000
   Landscaping                                                       381,000
   Utilities                                                         595,000
   Insurance                                                          57,000
   Property taxes                                                  1,697,000
   Other                                                             255,000
                                                            -------------------
                                                                   4,160,000
                                                            ===================
Excess of revenues over certain operating expenses               $15,701,000
                                                            ===================



SEE ACCOMPANYING NOTES.


                                       6
<PAGE>
                              Principal Properties

                     Notes to Combined Statement of Revenues
                         and Certain Operating Expenses




1. Background and Basis of Combination

The accompanying  combined  statement of revenues and certain operating expenses
(combined  statement) includes the accounts of certain retail and service center
real estate assets (the "Principal  Properties")  located in Texas and Oregon to
be acquired by PS Business  Parks,  L.P. The  combined  statement is prepared in
order to comply with Rule 3.14 of Regulation  S-X of the Securities and Exchange
Commission.  The combined statement includes only the accounts and activities of
the  Principal  Properties.  Items  which  are  not  comparable  to  the  future
operations of the Principal  Properties  have been excluded.  Such items include
mortgage interest, depreciation, management fees and interest income.

An audited  combined  statement  is being  presented  for the most  recent  year
available instead of the three most recent years based on the following factors:
(i) the Principal  Properties are to be acquired from an unaffiliated  party and
(ii) based on the investigation of the Principal Properties by the management of
PS Business Parks, L.P., it is not aware of any material factors relating to the
Principal  Properties  that would  cause this  financial  information  not to be
necessarily  indicative  of future  operating  results  other  than the  factors
specifically considered by PS Business Parks, L.P. as described below.

In the decision to acquire the Principal  Properties,  PS Business  Parks,  L.P.
considered the competition from other commercial property owners, the locations,
the leases, the rental rates and the occupancy levels of the properties.


                                       7
<PAGE>


                              Principal Properties

                     Notes to Combined Statement of Revenues
                   and Certain Operating Expenses (continued)




2. Summary of Significant Accounting Policies

Revenue Recognition

The leases of the Principal  Properties  are accounted for as operating  leases.
Rent revenues are recognized using the  straight-line  basis over the respective
lease terms.  Reimbursements from tenants are recognized as income in the period
the applicable costs are accrued.

Allowances for Uncollectible Accounts

Management   periodically  evaluates  amounts  billed  to  tenants  and  accrued
reimbursements  from tenants and adjusts the allowances for doubtful accounts to
reflect the amounts  estimated to be  uncollectible.  Amounts  determined  to be
uncollectible are included in operating expenses.

Use of Estimates

The preparation of the combined  statement in conformity with generally accepted
accounting  principles requires  management of the Principal  Properties to make
estimates  and  assumptions  that affect the  reported  amounts of revenues  and
certain operating  expenses during the reporting  periods.  Actual results could
differ from those estimates.


3. Leases

Future minimum rental  revenues  under  noncancelable  leases as of December 31,
1997 are as follows:

   1998                                                   $19,437,000
   1999                                                    18,763,000
   2000                                                    15,383,000
   2001                                                    11,953,000
   2002                                                     9,756,000
   Thereafter                                              14,584,000
                                                     ------------------
                                                          $89,876,000
                                                     ==================

                                       8
<PAGE>

Item 7 (b)    PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

PS Business  Parks,  Inc. (the  "Company" or "PSB") is the successor to American
Office  Park  Properties,  Inc.  ("AOPP")  and the  survivor  in the merger (the
"Merger") of PSB into Public Storage  Properties XI, Inc. ("PSP11") on March 17,
1998.  Based upon the terms of the merger (see below),  for financial  reporting
and  accounting  purposes  the  merger  has  been  accounted  for  as a  reverse
acquisition whereby PSB is deemed to have acquired PSP11. However,  PSP11 is the
continuing  legal  entity  and  registrant  for  both  Securities  and  Exchange
Commission  filing  purposes and income tax reporting  purposes.  All subsequent
references to PSB prior to March 17, 1998, refer to AOPP.

The  following  unaudited  pro  forma  consolidated  financial  statements  were
prepared to reflect the acquisition of real estate facilities acquired by PSB on
May 4, 1998, through its consolidated partnerships. Pursuant to the acquisition,
PSB acquired 14 properties located in Oregon, 14 properties located in Texas and
approximately  15 acres of vacant land in Oregon  (collectively  the  "Principal
Properties") for an aggregate cost of approximately  $190.5 million in cash. PSB
used available cash,  proceeds from the issuance of common stock, and borrowings
from Public Storage, Inc. to fund the transaction.

In addition,  the pro forma consolidated  financial statements reflect the March
17, 1998 Merger,  which is described in the Public  Storage  Properties XI, Inc.
Proxy Statement and Prospectus  dated February 5, 1998 (the "Proxy  Statement").
Pursuant to the Merger:

     *    PSB merged into PSP11.

     *    Each  outstanding  share of PSP11 Common Stock,  with the exception of
          106,155  shares  which  elected to  receive  $20.50 in cash per share,
          continues to be owned by current holders.

     *    Each  share of PSP11  Common  Stock  Series B and each  share of PSP11
          Common  Stock  Series C  converted  into .8641  share of PSP11  Common
          Stock.

     *    Each share of PSB Common  Stock  converted  into 1.18  shares of PSP11
          Common Stock.

     *    The surviving corporation in the Merger was renamed PS Business Parks,
          Inc.

     *    Concurrent  with the  Merger,  PSP11  exchanged  (the  "Exchange")  11
          mini-warehouses  and two properties  that combine  mini-warehouse  and
          commercial space for 11 commercial properties owned by Public Storage,
          Inc. ("PSI").

The Merger has been  accounted for as a reverse merger whereby PSB is treated as
the accounting  acquirer  using the purchase  method.  This has been  determined
based upon the following:

     *    The former shareholders and unitholders of PSB own in excess of 80% of
          the merged companies.

     *    The business focus post Merger will continue to be that of PSB's which
          includes the  acquisition,  ownership  and  management  of  commercial
          properties.  Prior to the  Merger,  PSP11's  business  focus  has been
          primarily  on  the  ownership   and  operation  of  its   self-storage
          facilities which represented approximately 81% of its portfolio.

In  addition  to  adjustments  to  reflect  the  acquisition  of  the  Principal
Properties  and the  Merger,  pro forma  adjustments  were made to  reflect  the
following  transactions  (all share and Operating  Partnership unit amounts have
been adjusted to reflect the conversion factor of 1.18 pursuant to the Merger):

                                       9
<PAGE>

     1.   On April 1, 1997,  PSB (through the  operating  partnership)  acquired
          four  commercial  properties  from PSI in exchange  for  1,480,968  OP
          Units.

     2.   On July 31,  1997,  PSB  acquired two  commercial  properties  from an
          unaffiliated third party for cash totaling $33,310,000. PSB raised the
          cash for this  acquisition by issuing  2,025,769  shares of PSB Common
          Stock primarily to PSI for cash totaling $33,800,000.

     3.   On September  24, 1997,  PSB acquired  one  commercial  property  (the
          "Largo  Property") from an  unaffiliated  third party for an aggregate
          cost  of  $10,283,000,  consisting  of  cash  of  $9,959,000  and the
          issuance of 14,384 Operating  Partnership  units ("OP Units") having a
          value of $324,000.

     4.   On December  10,  1997,  PSB  purchased  a  commercial  property  (the
          "Northpointe   Property")  for  $3,854,000,   consisting  of  cash  of
          $3,554,000  and the  issuance  of  13,111  OP Units  having a value of
          $300,000.

     5.   On December 24, 1997,  PSB completed a transaction  whereby PSB issued
          1,785,007  OP Units  and  3,504,758  shares of PSB  common  stock to a
          subsidiary of a state pension  fund,  and the  subsidiary of the state
          pension fund,  through a merger and  contribution,  transferred to PSB
          six commercial properties (the "Acquiport  Properties" - $118,655,000)
          and $1,000,000 cash. PSB incurred  $3,300,000 in transaction costs. On
          January 9, 1998,  the  subsidiary of the state pension fund  exercised
          its option to convert its OP Units into shares of PSB common  stock on
          a one-for-one basis.

     6.   In  January  1998,  PSB  entered  into an  agreement  with a group  of
          institutional  investors  under which PSB would issue up to  6,744,074
          shares of PSB common  stock at $22.88 per share in separate  tranches.
          The first tranche,  2,185,189  shares or $50.0 million,  was issued in
          January 1998.  The remainder of the shares ($105  million) were issued
          on May 6,  1998.  The  funds  were used to  finance  a portion  of the
          acquisition cost of the Principal Properties.

     7.   On  January  13,  1998,  PSB  purchased  a  commercial  property  (the
          "Ammendale   Property")  for   $22,518,000,   consisting  of  cash  of
          $22,325,000  and the  issuance  of 8,428  OP  Units  having a value of
          $193,000.

     8.   In March 1998,  PSB purchased two  commercial  properties  (the "March
          Acquisitions",  referred to in the Proxy  Statement  dated February 5,
          1998 as the "Proposed Acquisition Properties") from unaffiliated third
          parties for an aggregate cost of $32,916,000,  composed of $17,377,000
          cash,  the issuance of 44,250 OP Units  having a value of  $1,013,000,
          and the assumption of mortgage notes payable of $14,526,000.

The pro forma consolidated  balance sheet at December 31, 1997 has been prepared
to reflect (i) the  aforementioned  acquisitions  and proposed  acquisitions  of
commercial  properties  which occurred after December 31, 1997, (ii) the related
conversion  of OP  Units to PSB  Common  Stock by the  subsidiary  of the  state
pension  fund,  (iii) the  issuance  of $155.0  million of PSB  Common  Stock to
institutional investors, and (iv) the Merger transaction between PSB and PSP11.

The pro forma  consolidated  statement of income for the year ended December 31,
1997 has been prepared assuming (i) the aforementioned acquisitions and proposed
acquisitions of commercial properties (ii) the issuance of $155.0 million of PSB
Common Stock to  institutional  investors,  and (iii) the Merger between PSB and
PSP11,  as if all such  transactions  were  completed at the beginning of fiscal
1997. The operations of all property  acquisitions  are  based on the historical
operating results for 1997. The operations of the Principal  Properties  include
minimal,  if any,  operations in 1997 for two facilities for which  construction
was  completed in late 1997 and early 1998 and for a parcel of vacant land.  The
consideration  paid related to these three  properties  is  approximately  $16.4
million of the $190.5 million purchase price for the entire portfolio.

The pro forma adjustments are based upon available  information and upon certain
assumptions  as set forth in the notes to the pro forma  consolidated  financial

                                    10
<PAGE>

statements that PSP11 and PSB believe are reasonable in the  circumstances.  The
pro forma  consolidated  financial  statements and accompanying  notes should be
read in conjunction with the historical  financial statements of PSP11, PSB, and
certain  financial  information  with  respect  to  properties  acquired.   (SEE
"FINANCIAL  STATEMENTS -ACQUIRED PROPERTIES,  -PSI EXCHANGE PROPERTIES,  -BALDON
PROPERTIES,  -LARGO  PROPERTY,  -ACQUIPORT  PROPERTIES,   -PROPOSED  ACQUISITION
PROPERTIES, -NORTHPOINTE PROPERTY, AND -AMMENDALE PROPERTY INCLUDED IN THE ABOVE
REFERENCED  PROXY  STATEMENT).  The following pro forma  consolidated  financial
statements do not purport to represent  what PSB's  results of operations  would
actually have been if the  transactions in fact had occurred at the beginning of
fiscal 1997 or to project  PSB's  results of  operations  for any future date or
period.



                                       11
<PAGE>
<TABLE>
<CAPTION>

                             PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)
             (Amounts in thousands, except share and per share data)

                                                                                    PSB
                                                      -------------------------------------------------------------   
                                                                                                                      
                                                                          Pro Forma Adjustments                       
                                                                          ---------------------                       
                                                                        Property          Other             PSB       
                       ASSETS                              PSB        Acquisitions     Adjustments      Pre-Merger    
                                                      (Historical)      (Note 1)         (Note 2)       (Pro Forma)   
                                                      ------------   --------------   -------------   -------------   
<S>                                                   <C>            <C>              <C>             <C>             
Cash and cash equivalents                             $     3,884    $     (148,227)  $     146,200   $       1,857   
Real estate facilities, net of accumulated                314,238           245,959               -         560,197   
   depreciation
Intangible assets, net of accumulated amortization          3,272                 -               -           3,272   
Other assets                                                2,060                 -               -           2,060   
Purchase cost                                                   -                 -               -               -   
                                                      ------------   --------------   -------------   -------------   
     Total assets                                     $   323,454    $       97,732   $     146,200   $     567,386   
                                                      ============   ==============   =============   =============   
        LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued and other liabilities                         $     8,331    $            -   $      (2,900)  $       5,431   
Notes payable                                               3,500            96,526          (3,500)         96,526   
Minority interest                                         168,665             1,206         (24,663)        145,208   
Shareholder's equity:
   Common stock , $.10 par value, 100,000,000 shares authorized 7,728,000 issued
      and outstanding (18,570,827 pro forma shares
      issued and outstanding)                                 773                               856           1,629   
   Series A                                                     -                 -               -               -   
   Series B                                                     -                 -               -               -   
   Series C                                                     -                 -               -               -   
   Paid-in capital                                        142,581                           176,407         318,988   
   Cumulative net income                                    3,154                 -               -           3,154   
   Cumulative distribution paid                            (3,550)                -               -          (3,550)  
                                                      ------------   --------------   -------------   -------------   
       Total shareholders' equity                         142,958                 -         177,263         320,221   
                                                      ------------   --------------   -------------   -------------   
   Total liabilities and shareholders' equity         $   323,454    $       97,732   $     146,200   $     567,386   
                                                      ============   ==============   =============   =============   

Book value per share of common stock (Note 4)         $     18.50                                    $        19.66   
                                                      ============                                    =============   
Shares outstanding                                      7,728,309                                        16,287,390   
                                                      ============                                    =============   

</TABLE>
<TABLE>
<CAPTION>

                             PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)
             (Amounts in thousands, except share and per share data)

                                                     
                                                     
                                                                         Pro Forma Merger
                                                                           Adjustments
                                                                           -----------
                                                                                                     PSB
                       ASSETS                            PSP11        Purchase     Valuation     Post-Merger
                                                      (Historical)    (Note 3)      (Note 3)     (Pro Forma)
                                                      ------------  -----------   ------------  -------------
<S>                                                   <C>           <C>           <C>           <C>          
Cash and cash equivalents                             $     2,455   $    (2,976)  $         -   $       1,336
Real estate facilities, net of accumulated                 25,937             -        23,156         609,290
   depreciation
Intangible assets, net of accumulated amortization              -             -        (1,540)          1,732
Other assets                                                  454             -             -           2,514
Purchase cost                                                   -        48,987       (48,987)              -
                                                      ------------  -----------   ------------  -------------
     Total assets                                     $    28,846   $    46,011   $   (27,371)  $     614,872
                                                      ============  ===========   ============  =============
        LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued and other liabilities                         $     1,475   $         -   $         -   $       6,906
Notes payable                                                   -             -             -          96,526
Minority interest                                               -             -             -         145,208
Shareholder's equity:
   Common stock , $.10 par value, 100,000,000 shares 
      and outstanding (18,570,827 pro forma shares
      issued and outstanding)                                   -           228             -           1,857
   Series A                                                    18             -           (18)              -
   Series B                                                     2             -            (2)              -
   Series C                                                     5             -            (5)              -
   Paid-in capital                                         32,421        45,783       (32,421)        364,771
   Cumulative net income                                   29,451             -       (29,451)          3,154
   Cumulative distribution paid                           (34,526)            -        34,526          (3,550)
                                                      ------------  -----------   ------------  -------------
       Total shareholders' equity                          27,371        46,011       (27,371)        366,232
                                                      ------------  -----------   ------------  -------------
   Total liabilities and shareholders' equity         $    28,846   $    46,011   $   (27,371)  $     614,872
                                                      ============  ===========   ============  =============

Book value per share of common stock (Note 4)         $     10.83                               $       19.72
                                                      ============                              =============
Shares outstanding                                      2,527,008                                  18,570,827
                                                      ============                              =============

</TABLE>

         See Accompanying Notes to Pro Forma Consolidated Balance Sheet.
                                       12

<PAGE>

                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)


1.   ACQUISITION OF REAL ESTATE FACILITIES
     -------------------------------------
     On January 13, 1998, PSB purchased the Ammendale  property for an aggregate
     cost of  $22,518,000  consisting  of  $22,325,000  cash and the issuance of
     8,428 OP Units having a value of $193,000.

     In  March  1998,  PSB  purchased  two  commercial  properties  (the  "March
     Acquisitions,"  referred to as the "Proposed Acquisition Properties" in the
     Proxy Statement dated February 5, 1998) from unaffiliated third parties for
     an  aggregate  cost of  $32,916,000,  composed  of  $17,377,000  cash,  the
     issuance  of  44,250  OP  Units  having  a  value  of  $1,013,000,  and the
     assumption of mortgage notes payable of $14,526,000.

     On May 4, 1998, PSB acquired the Principal Properties for an aggregate cost
     of approximately  $190.5 million in cash. PSB financed the transaction with
     cash  on  hand,  cash  proceeds  from  the  issuance  of  common  stock  to
     institutional investors in May 1998, and borrowings from an affiliate.

     The  following  pro  forma  adjustments  have  been  made to the pro  forma
     consolidated  balance  sheet  as  of  December  31,  1997  to  reflect  the
     acquisition and proposed  acquisitions of the above  commercial  properties
     and the related issuance of OP Units:

<TABLE>
<CAPTION>
                                                                                               in (000's)
                                                                                               ----------
     <S>                                                                                  <C>       
     *    Cash and cash equivalents has been decreased to reflect the cash
          portion of the acquisition cost of the properties purchased, as follows:
              March Acquisitions................................................            $    (17,377)
              Ammendale Property................................................                 (22,325)
              Principal Properties..............................................                (190,525)
              Borrowings from Affiliate.........................................                  82,000
                                                                                               ----------
                                                                                            $   (148,227)
                                                                                               ==========

     *    Real estate facilities has been adjusted to reflect the
          acquisition cost of the facilities acquired:
              March Acquisitions................................................            $     32,916
              Ammendale Property................................................                  22,518
              Principal Properties..............................................                 190,525
                                                                                               ----------
                                                                                            $    245,959
                                                                                               ==========

     *    Notes payable has been increased to reflect:
              March Acquisitions (debt assumed).................................            $     14,526
              Borrowings from Affiliate.........................................                  82,000
                                                                                               ----------
                                                                                            $     96,526
                                                                                               ==========

     *    Minority interest has been increased to reflect the issuance
          of 52,678 OP Units in connection  with the  acquisition of the
          March Acquisitions and Ammendale properties...........................            $      1,206
                                                                                               ==========
</TABLE>
    
                                       13
<PAGE>

                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)

2.   OTHER ADJUSTMENTS
     -----------------

     On  December  24,  1997,  PSB  completed a  transaction  whereby PSB issued
     1,785,007 OP Units and 3,504,758 shares of PSB common stock to a subsidiary
     of a state  pension  fund,  and the  subsidiary  of the state pension fund,
     through  a  merger  and  contribution,  transferred  to PSB six  commercial
     properties ($118,655,000) and $1,000,000 cash. The Company incurred a total
     of $3,300,000 in transaction costs.  Approximately  $400,000 of these costs
     were  paid in  December  1997 and  approximately  $2,900,000  were  paid in
     January 1998.

     On January 9, 1998, the  subsidiary,  which was issued OP Units,  exercised
     its option to convert  the OP Units  into  shares of PSB common  stock on a
     one-for-one basis.

     In  January  1998,   PSB  entered  into  an  agreement   with  a  group  of
     institutional  investors under which PSB would issue up to 6,744,074 shares
     of PSB common  stock at $22.88 per share in  separate  tranches.  The first
     tranche,  2,185,189 shares or $50.0 million, was issued in January 1998 and
     the  remainder of the shares were issued in May 1998.  Funds from the first
     tranche were utilized to repay a $3,500,000  loan due to an  affiliate,  to
     fund  remaining  unpaid costs related to the  subsidiary of a state pension
     fund  transaction,  and to  complete  the  real  estate  transactions  that
     occurred  during the first three months of 1998.  The net proceeds from the
     shares  issued  in  May  1998,  were  utilized  to  fund a  portion  of the
     acquisition cost of the Principal Properties.

     The following pro forma  adjustments have been made to reflect the issuance
     of $155.0  million  of PSB Common  Stock to  institutional  investors,  the
     conversion  of the OP Units into shares of PSB stock,  PSB's  payoff of its
     loan from PSI,  and the  payment  of  remaining  transaction  costs for the
     subsidiary of the state pension fund transaction:
<TABLE>
<CAPTION>
                                                                                             (in 000's)
                                                                                             ----------
    <S>                                                                                 <C>
     *    Cash and cash equivalents has been increased to reflect the net
          proceeds from the issuance of common stock to institutional investors
          (gross proceeds of $155,000,000 less estimated offering costs of      
          $2,400,000)...........................................................         $       152,600

     *    Cash and cash equivalents have been decreased to reflect the
          utilization   of  a   portion   of  the   proceeds   from  the
          institutional  investors to repay the  $3,500,000  loan due to
          PSI, and to reflect the payment of $2,900,000 in transaction costs  
          which were unpaid and accrued at December 31, 1997....................                  (6,400)
                                                                                               ----------
                                                                                         $       146,200
                                                                                               ==========

     *    Accounts payable and accrued liabilities have been reduced to reflect
          the payment of transaction costs which were unpaid and accrued at
          December 31, 1997.....................................................         $        (2,900)
                                                                                               ==========


     *    Notes payable have been reduced to reflect the repayment of a
          $3,500,000 loan due to PSI............................................         $        (3,500)
                                                                                               ==========


     *    Common Stock has been adjusted to reflect the following items:
          *   Conversion of 1,785,007 OP Units into PSB common stock............         $           179
          *   Issuance of 6,774,074 shares of PSB common stock to institutional
              investors.........................................................                     677
                                                                                               ----------
                                                                                         $           856
                                                                                               ==========
</TABLE>
                                       14
<PAGE>

                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)
<TABLE>
<CAPTION>
                                                                                             (in 000's)
                                                                                             ----------

    <S>                                                                                  <C>
     *    Paid in capital has been adjusted to reflect the following items:
          *   Conversion of 1,785,007 OP Units into PSB common stock............         $        24,484
          *   Issuance of 6,774,074 shares of PSB common stock to institutional
              investors ($152,600,000 net proceeds less $677,000 Par Value).....                 151,923
                                                                                               ----------

                                                                                         $       176,407
                                                                                               ==========

     *    Minority Interest has been adjusted to reflect the conversion of
          1,785,007 OP Units into PSB common stock..............................         $       (24,663)
                                                                                               ==========

3.   MERGER PRO FORMA ADJUSTMENTS
     -----------------------------

     The Merger will be accounted  for using the purchase  method of  accounting
     with PSB being the  accounting  acquirer.  The total  purchase cost will be
     allocated to the  acquired  net assets of PSP11;  first to the tangible and
     identifiable  intangible  assets and liabilities  acquired based upon their
     respective  fair values,  and the remainder will be allocated to the excess
     of  purchase  cost  over  fair  value  of  assets  acquired,  if any.  Upon
     completion of the Merger,  the outstanding  shares of PSB common stock were
     converted into an aggregate of 11,698,505  shares of PSP11 Common Stock and
     the surviving entity was renamed "PS Business Parks, Inc."

     In determining  the cost of the Merger,  PSB evaluated as a measure of cost
     of the Merger (i) the aggregate fair value of PSP11's net assets  acquired,
     (ii) the fair value of PSP11's Common Stock traded in the market, and (iii)
     the cash  election  price of $20.50 per share of PSP11  Common  Stock.  PSB
     determined that the use of the cash price of $20.50 was a reliable  measure
     of the Merger cost; further, that such cash price was materially equivalent
     to the Merger cost had either of the other alternatives been chosen,  based
     upon the following:

     *    The fair value of the net assets of PSP11 were readily determinable as
          of August 15, 1997 (date the Merger was announced).  Substantially all
          of the PSP11 assets were  comprised of real estate  facilities  having
          current appraised values as determined by independent appraisers.  The
          estimated  fair  value per share of PSP11  Common  Stock at August 15,
          1997  based upon the fair  values of the net assets was  approximately
          $20.50 per share.

     *    Since PSB is the accounting acquirer,  PSB's common stock market price
          would have been an indicator of the Merger cost. However, PSB's common
          stock was not publicly  traded,  accordingly,  PSB  evaluated  PSP11's
          common stock as a  determination  of PSB's implied common stock value.
          The market price of PSP11's  Common Stock from January 1, 1997 through
          August 15, 1997 ranged from $20-3/8 to $19-3/8.  The closing  price of
          PSP11's Common Stock on August 15, 1997, was $20.00.  PSP11's  trading
          price for the one month period after the  announcement of the proposed
          Merger traded in the range from $19-15/16 to $20-9/16.

     *    Each  outstanding  share of PSP11 Common  Stock with the  exception of
          106,155  shares,  which  elected to receive  $20.50 in cash per share,
          continued to be owned by current holders.

     In determining the fair value of the net assets to be acquired,  historical
     carrying  values as of December  31, 1997 were used with respect to PSP11's
     other assets and accrued  liabilities since they approximate fair value and
     appraised  values  were  used  for  PSP11's  real  estate  facilities.  The
     aggregate  purchase cost and its  preliminary  allocation to the historical
     assets and liabilities is as follows:


                                       15
<PAGE>
</TABLE>


                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)
<TABLE>
<CAPTION>
                                                                                                     (in 000's)
                                                                                                     ----------
     PURCHASE COST:
     --------------

     <S>                                                                                         <C>           
     *    Issuance  of  1,713,782  shares of Common  Stock to  PSP11's  Series A
          common shareholders (1,819,937 shares outstanding less shares electing
          cash of 106,155) at $20.50 per share..................................                    $   35,133
     *    Issuance of 569,655  shares of Common  Stock to the holders of PSP11's
          Common  Stock  Series  B  and  Series  C  (707,071   combined   shares
          outstanding  less  cancellation  of  47,824  shares  of  Series  C the
          remaining of which is multiplied by the conversion ratio of 0.8641) at
          $20.50 per share......................................................                        11,678
     *    Cash elections  (106,155  shares of the Series A Common Stock of PSP11
          elected to receive $20.50 per share in cash in the Merger)............                         2,176
                                                                                                     ----------
            Total Purchase Cost.................................................                    $   48,987
                                                                                                     ==========

     PRELIMINARY ALLOCATION OF PURCHASE COST:
     ----------------------------------------

          Cash..................................................................                    $    2,455
          Other assets..........................................................                           454
          Accrued and other liabilities.........................................                        (1,475)
          Real estate facilities (fair value of $48,000,000 less $447,000 of
          excess aggregate fair values of net assets acquired over purchase                             47,553
          cost).................................................................                     ----------
                                                                                                    $   48,987
                                                                                                     ==========

     The following pro forma adjustments have been made to reflect the Merger as
     of December 31, 1997:

     PURCHASE ADJUSTMENTS:
     ---------------------

     *    Cash and cash  equivalents  have  been  reduced  to  reflect  the cash
          necessary  to  satisfy  cash  elections   ($2,176,000)  combined  with
          estimated direct costs and expenses of the merger of $800,000.........                   $   (2,976)
                                                                                                     ==========

     *    Unallocated  purchase cost has been increased to reflect the aggregate
          purchase cost.........................................................                   $   48,987
                                                                                                     ==========

     *    Common  stock has been  increased to reflect the issuance of 2,283,437
          shares with a par value of $0.10 per share............................                   $      228
                                                                                                     ==========

     *    Paid-in  Capital has been  increased to reflect the issuance of common
          stock  ($46,811,000  less par value of $228,000 and  estimated  direct
          costs and expenses of the Merger of $800,000).........................                   $   45,783
                                                                                                     ==========
</TABLE>
                                       16
<PAGE>

                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)
<TABLE>
<CAPTION>

                                                                                                      (in 000's)
                                                                                                      ----------
         VALUATION ADJUSTMENTS:
         ----------------------

     <S>                                                                                           <C>
     *    Unallocated purchase cost has been decreased to reflect the allocation
          of the aggregate purchase cost........................................                    $  (48,987)
                                                                                                    ===========

     *    Real estate facilities has been increased to reflect the fair value of
          the real estate  facilities  to be  acquired  in the Merger  (purchase
          price  allocation of $47,553,000  plus related net historical  cost of
          management  contracts on PSB's books with  respect to such  properties
          ($1,540,000) less PSP11 historical net book value of $25,937,000).....                    $   23,156
                                                                                                    ===========

     *    PSB's   intangible   assets   have  been   reduced  to   reflect   the
          reclassification  to real estate  with  respect to the above pro forma
          adjustment............................................................                    $   (1,540)
                                                                                                    ===========

     *    PSP11's historical equity has been eliminated as follows:
          Series A common stock................................................                     $      (18)
          Series B common stock................................................                             (2)
          Series C common stock................................................                             (5)
          Paid-in-capital......................................................                        (32,421)
          Cumulative net income................................................                        (29,451)
          Cumulative distributions.............................................                         34,526
                                                                                                    -----------
                                                                                                    $  (27,371)
                                                                                                    ===========
</TABLE>
EXCHANGE OF PROPERTIES
- ----------------------

     Concurrent  with the Merger,  PSP11  exchanged 11  mini-warehouses  and two
     properties  that  combine   mini-warehouse  and  commercial  space  for  11
     commercial  properties  owned by PSI. The fair value of the  mini-warehouse
     facilities is approximately  $42,400,000  compared to the fair value of the
     11 commercial  properties  received of  $42,900,000.  Through the pro forma
     adjustments above, the commercial facilities are reflected on the pro forma
     consolidated  balance sheet at their fair approximate values as a result of
     the accounting  acquisition of PSP11 by PSB. No additional adjustments have
     been made to reflect the Exchange as the relative valuations are nearly the
     same.


                                       17
<PAGE>

                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)


4.   BOOK VALUE PER SHARE OF COMMON STOCK
     ------------------------------------

     Book value per share has been  determined by dividing  total  shareholders'
     equity by the outstanding shares of Common Stock. The following  summarizes
     the shares outstanding:
<TABLE>
<CAPTION>

                                                                                                 Common shares
                                                                                                   outstanding
                                                                                                   -----------
    <S>                                                                                            <C>
     *    PSB historical shares outstanding at December 31, 1997................                     7,728,309
     *    PSB shares  issued to  subsidiary  of state pension fund in connection
          with conversion of its OP Units into common stock of PSB..............                     1,785,007
     *    Pro forma shares issued to institutional investors....................                     6,774,074
                                                                                                   -----------
              Pre-Merger pro forma PSB shares outstanding.......................                    16,287,390

     *    PSP11's Series A shares (see "Purchase cost" above)...................                     1,713,782

     *    PSP11's Series B and C (see "Purchase cost" above)....................                       569,655
                                                                                                   -----------

              Post-Merger pro forma PSB shares outstanding......................                    18,570,827
                                                                                                   ===========


</TABLE>
                                       18
<PAGE>
<TABLE>
<CAPTION>

                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For the Year Ended December 31, 1997
                                   (Unaudited)
                  (Amounts in thousands, except per share data)


                                                                              PSB
         
                                           ------------------------------------------------------------------------------  
                                                                                                                           
                                                                       Pro Forma Adjustments                               
                                                          ----------------------------------------------                   
                                                          Acquisition of   Acquisition of                                  
                                                            real estate     real estate from     Other            PSB      
                                                PSB       from affiliates    third parties    adjustments      Pre-Merger  
                                           (Historical)      (Note 1)         (Note 2)         (Note 3)      (Pro forma)   
                                           ------------      --------         --------         --------      -----------   
REVENUES:
   Rental income:
<S>                                         <C>            <C>             <C>               <C>             <C>           
     Commercial properties                  $   30,169     $    1,038      $   46,885        $        -      $   78,092    
     Mini-warehouse properties                       -              -               -                 -               -    
   Facility management fees                        956            (52)              -                 -             904    
   Interest and other income                       453              -               -                 -             453    
                                           ------------      --------         --------         --------      -----------   
                                                31,578            986          46,885                 -          79,449    
                                           ------------      --------         --------         --------      -----------   
EXPENSES:
   Cost of operations:
     Commercial properties                      12,330            363          12,415                 -          25,108    
     Mini-warehouse properties                       -              -               -                 -               -    
   Cost of managing facilities                     189            (12)              -                 -             177    
   Depreciation and amortization                 5,195             92          10,863                 -          16,150    
   General and administrative                    1,461              -               -               300           1,761    
   Interest expense                                  1              -           7,665                 -           7,666    
                                           ------------      --------         --------         --------      -----------   
                                                19,176            443          30,943               300          50,862    
                                           ------------      --------         --------         --------      -----------   
   Income before minority interest in
     income                                     12,402            543          15,942              (300)         28,587    
   Minority interest in income (Note 7)         (8,566)             -               -              (353)         (8,919)   
                                           ------------      --------         --------         --------      -----------   

   Net income (loss)                        $    3,836       $    543        $ 15,942          $   (653)     $   19,668    
                                           ============      ========         ========         =========     ===========   

   PER SHARE OF COMMON STOCK:
   Net income (Note 4 and 6)                $     1.23                                                       $     1.21    
                                           ------------                                                      ===========   
   Weighted average shares (Note 4 and 6)        3,117                                                           16,287    
                                           ============                                                      ===========   
</TABLE>
<TABLE>
<CAPTION>


                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For the Year Ended December 31, 1997
                                   (Unaudited)
                  (Amounts in thousands, except per share data)


                                           
         
                                                                Pro Forma
                                                                 Merger
                                                               Adjustments
                                                              -------------
                                                               Exchange of
                                                                real estate         PSB
                                                  PSP11         facilities      Post-Merger
                                              (Historical)      (Note 5)       (Pro forma)
                                              ------------      --------       -----------
REVENUES:
   Rental income:
<S>                                           <C>             <C>              <C>       
     Commercial properties                    $    1,418      $    8,008       $   87,518
     Mini-warehouse properties                     6,143          (6,143)               -
   Facility management fees                            -            (471)             433
   Interest and other income                          82               -              535
                                              ------------      --------       -----------
                                                   7,643           1,394           88,486
                                              ------------      --------       -----------
EXPENSES:
   Cost of operations:
     Commercial properties                           682           3,271           29,061
     Mini-warehouse properties                     2,082          (2,082)               -
   Cost of managing facilities                         -             (93)              84
   Depreciation and amortization                   1,198             146           17,494
   General and administrative                        201               -            1,962
   Interest expense                                    -               -            7,666
                                              ------------      --------       -----------
                                                   4,163           1,242           56,267
                                              ------------      --------       -----------
   Income before minority interest in
     income                                        3,480             152           32,219
   Minority interest in income (Note 7)                -            (248)          (9,167)
                                              ------------      --------       -----------

   Net income (loss)                          $    3,480        $    (96)      $   23,052
                                              ============      ========       =========== 

   PER SHARE OF COMMON STOCK:
   Net income (Note 4 and 6)                  $     1.38                       $     1.24
                                              ============                     ===========
   Weighted average shares (Note 4 and 6)          2,527                           18,571
                                              ============                     ===========
</TABLE>
   See Accompanying Notes to Pro-Forma Consolidated Statements of Income.
                                       19


<PAGE>

                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                      For the Year Ended December 31, 1997
                                   (Unaudited)



1.   Acquisition  of real  estate  facilities  from  affiliates  (the  "Acquired
     Properties")


     On April 1,  1997,  the  Operating  Partnership  acquired  four  commercial
     properties from PSI in exchange for 1,480,968 OP Units.

     The  following  pro  forma  adjustments  have  been  made to the pro  forma
     consolidated   statements  of  income  to  reflect  the  above  as  if  the
     transaction was completed as of January 1, 1997:
<TABLE>
<CAPTION>

                                                                                         (in 000's)
                                                                                         ----------
     <S>                                                                                <C>
     *    Rental income has been increased to reflect:
          *    the pro  forma  rental  income as if the real  estate  facilities
               acquired on April 1, 1997 were owned by PSB throughout the entire
               period..........................................................         $     4,127
          *    less the rental income with respect to these properties included 
               in PSB's historical amounts......................................             (3,089)
                                                                                         ----------
                  Total incremental rental income...............................        $     1,038
                                                                                         ==========

          *   Facility  management  fee income has been  decreased to eliminate
              PSB's historical  management fee income (5% of rental income) with
              respect to the commercial properties acquired on April 1, 1997, as
              such fee is not collected
              on owned facilities...............................................       $       (52)
                                                                                         ==========

          *   Cost of operations has been increased as follows:
              *   To reflect  the pro forma cost of  operations  as if the real
                  estate facilities  acquired on April 1, 1997 were owned by PSB
                  throughout the entire full period.............................        $     1,227
              *   The above adjustment excludes facility management fees,  
                  accordingly, a pro forma adjustment has been made to reflect 
                  the actual cost of management.................................                 41
              *   To eliminate cost of operations included in PSB's historical 
                  amounts.......................................................               (905)
                                                                                         ==========
                      Total incremental cost of operations......................        $       363
                                                                                         ==========


           *  Cost of managing  facilities  has been decreased to eliminate the
              costs  associated  with the  management fee income with respect to
              the  properties  acquired  on  April 1,  1997.  The  reduction  in
              management fee income will result in a reduction in cost of 
              operations with respect to facility management....................         $      (12)
                                                                                         ==========


           *  Depreciation has been increased to reflect the incremental 
              depreciation of the commercial properties acquired on 
              April 1, 1997.....................................................         $      92
                                                                                         ==========
</TABLE>
                                       20
<PAGE>

                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)

2.       ACQUISITION OF REAL ESTATE FACILITIES FROM THIRD PARTIES
         --------------------------------------------------------

          During 1997 and 1998,  PSB has  completed the  acquisition  of several
          properties:

     *    Baldon Properties: In July 1997, PSB issued 2,025,769 shares of common
          stock  primarily  to PSI  for  cash  totaling  $33,310,000.  PSB  used
          substantially all of the proceeds to acquire two commercial properties
          in July 1997 from an unaffiliated third party for $33,750,000 in cash.

     *    Largo  Property:  On September 24, 1997,  PSB acquired one  commercial
          property  for  an  aggregate  cost  of   $10,283,000,   consisting  of
          $9,959,000 cash and the issuance of 14,384 OP units having a value of
          $324,000.

     *    On December  10,  1997,  PSB  purchased  a  commercial  property  (the
          "Northpointe   Property")  for  $3,854,000,   consisting  of  cash  of
          $3,554,000  and the  issuance  of  13,111  OP units  having a value of
          $300,000.

     *    Acquiport   Properties:   On  December  24,  1997,   PSB  completed  a
          transaction  where PSB issued  1,785,007 OP Units and 3,504,758 shares
          of PSB common stock to a subsidiary of a state  pension fund,  and the
          subsidiary  of  the  state   pension   fund,   through  a  merger  and
          contribution,   transferred   to   PSB   six   commercial   properties
          ($118,655,000) and $1,000,000 cash. The Company incurred $3,300,000 in
          transaction  costs.  In  January  1998,  the  subsidiary  of the state
          pension fund  exercised its option to convert the OP units into shares
          of PSB common stock.

     *    On  January  13,  1998,  PSB  purchased  a  commercial  property  (the
          "Ammendale   Property")  for   $22,518,000,   consisting  of  cash  of
          $22,325,000  and the  issuance  of 8,428  OP  units  having a value of
          $193,000.

     *    March  Acquisition  Properties:  In  March  1998,  PSB  purchased  two
          commercial properties from unaffiliated third parties for an aggregate
          cost of  $32,916,000  consisting  of cash  totaling  $17,377,000,  the
          issuance  of  44,250  OP Units  having a value of  $1,013,000  and the
          assumption of $14,526,000 of mortgage debt.

     *    On May 4, 1998, PSB acquired the Principal Properties for an aggregate
          cost of  approximately  $190.5  million  in  cash.  PSB  financed  the
          acquisition  costs  through the use of available  cash,  cash proceeds
          from the issuance of common stock in May 1998, and borrowings  from an
          affiliate.

          The  following  pro forma  adjustments  have been made to reflect  the
          operations of these properties as if such properties had been acquired
          at the beginning of the year:



                                       21
<PAGE>
                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)

<TABLE>
<CAPTION>


                                                                                                             (000's)
                                                                                                             -------
         <S>                                                                                                  <C>
        *     Rental income has been  increased to reflect the pro forma rental
              income of the properties, as if these facilities were owned by PSB
              throughout 1997:
              *     Rental income for 1997 for the following properties:
                      Baldon properties .......................................................             $    6,570
                      Largo property...........................................................                  1,343
                      Acquiport  properties....................................................                 14,813
                      Northpointe Property.....................................................                    631
                      Ammendale Property.......................................................                  2,883
                      March Acquisitions.......................................................                  3,916
                      Principal Properties.....................................................                 19,861
               *   Less:  the portion of rental income with respect to these properties which
                   has been included in PSB's historical amounts...............................                 (3,132)
                                                                                                             ----------
                                                                                                            $   46,885
                                                                                                             ==========

               *  Cost of  operations  has been  increased  to reflect  the pro
                  forma cost of operations of these properties,  as if they were
                  owned by PSB throughout the entire period presented:
                  *  Cost  of  operations   for  the  entire  year's   properties'
                     historical operations:
                      Baldon.................................................................               $    2,280
                      Largo..................................................................                      367
                      Acquiport Properties...................................................                    3,059
                      Northpointe Property...................................................                      125
                      Ammendale Property.....................................................                      640
                      March Acquisitions.....................................................                    1,089
                      Principal Properties...................................................                    4,160
                      *  Less: the portion of cost of operations with respect to these
                         properties which has been included in PSB's historical amounts......                   (1,157)
                      *  Plus:  Pro forma adjustment to reflect additional estimated personnel
                         cost to manage the facilities and property taxes.....................                   1,852
                                                                                                             ==========
                                                                                                            $   12,415
                                                                                                             ==========

               *  Depreciation  has been  increased  to  reflect a full  year's
                  depreciation expense........................................................               $   10,863
                                                                                                             ==========

                * Interest expense has been increased to reflect the historical
                  interest  expense  for  each  of the  periods  presented  with
                  respect to the  assumption  of mortgage  notes payable and the
                  borrowings from Public Storage, Inc. in
                  connection with the acquisition of the Principal Properties.................              $    7,665
                                                                                                             ==========


</TABLE>

                                       22
<PAGE>
                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)

3.        Other pro forma adjustments
          ---------------------------

<TABLE>
<CAPTION>
         <S>                                                                                                <C>
          *   A pro forma  adjustment  has been made to  increase  general  and
              administrative expense to reflect additional costs with respect to
              payroll as PSB hires
              acquisition and executive personnel.............................................              $      300
                                                                                                             ==========


          *   Many of the properties acquired were acquired by the consolidated
              Operating  Partnership  in  exchange  for OP  Units  of PSB.  Such
              ownership  interests are  represented as minority  interest in the
              consolidated  financial  statements.   Accordingly,  a  pro  forma
              adjustment has been made to increase "Minority interest in income"
              to  reflect  the  incremental  income  associated  with pro  forma
              adjustments  allocable to the minority interest  (representing the
              difference  between  the pro  forma  amounts  less the  historical
              amounts included in PSB's
              historical financial statements)................................................              $     (353)
                                                                                                             ==========
</TABLE>

                                       23
<PAGE>
                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)

<TABLE>
<CAPTION>

4.        NET INCOME PER COMMON SHARE (PSB PRE-MERGER PRO FORMA) HAS BEEN COMPUTED AS FOLLOWS:
          ------------------------------------------------------------------------------------

                                                                                                           (000's)
                                                                                                        -------------
          <S>                                                                                           <C>
           Historical net income.........................................................               $   3,836,000

           Historical weighted average common shares.....................................                   3,116,688

           Historical net income per common share........................................               $       1.23

           Pro forma net income..........................................................               $  19,668,000

           Pro forma weighted average common shares (1)..................................                  16,287,390

           Pro forma net income per common share.........................................               $       1.21

- ----------------------------------------------------------------------------------------------------------------------------
           (1)
           Historical weighted average shares (common and equivalents)...................                   3,116,688
           Adjusted for:

               Issuance  of  common  shares  in  July  1997 in  connection  with
                  property acquisitions  (2,025,769 shares less 851,507 included
                  in the historical
                  amounts)...............................................................                   1,174,262

               Issuance of common stock to subsidiary of a state pension fund on
                  December  24,  1997  (3,504,758   shares  less  67,399  shares
                  included in the
                  historical amounts)....................................................                   3,437,359

               Issuance of common stock to subsidiary of a state pension fund in
                  connection with conversion of OP Units into common stock...............                   1,785,007

               Pro forma issuance of common stock to institutional investors.............                   6,774,074
                                                                                                        -------------

                    Total Pre-Merger pro forma weighted average shares...................                  16,287,390
                                                                                                        =============

</TABLE>
                                       24
<PAGE>
  
5.       PRO FORMA MERGER ADJUSTMENTS - EXCHANGE OF PROPERTIES:
         ------------------------------------------------------

          Concurrent with the Merger, PSP11 exchanged 11 mini-warehouses and two
          properties  that combine  mini-warehouse  and commercial  space for 11
          commercial properties owned by PSI.
<TABLE>
<CAPTION>

                                                                                                                 (000's)
                                                                                                                 -------
          <S>                                                                                                    <C>  
           *   Rental  income-  commercial  properties  has been  increased  to
               reflect  the rental  income  with  respect  to the 11  commercial
               properties received through
               the Exchange..................................................................              $       8,008
                                                                                                           ==============


           *   Rental income-  mini-warehouses  has been decreased to eliminate
               the  rental   income  with  respect  to  the  11   mini-warehouse
               facilities and two properties that combine mini-warehouse and 
               commercial space given up through the Exchange                                              $      (6,143)
                                                                                                           ==============

             *  A pro forma adjustment has been made to facility management fees to:
                *  eliminate the historical facility management fees related to 11
                   commercial properties acquired in the Exchange as such fee will no longer
                   be charged to these properties as PSB will own them.......................              $        (400)
                *  eliminate the historical facility management fees related to the two
                   commercial properties of PSP11 acquired in the Merger.....................                        (71)
                                                                                                           --------------
                                                                                                           $        (471)
                                                                                                           ==============

             *  A pro forma adjustment has been made to cost of operations to:
                *  eliminate  historical  management fees paid to PSB to manage
                   PSP11's  two  commercial  properties  which are  included  in
                   historical amounts and as a
                   result of the Merger will no longer be incurred...........................              $         (71)
                *  reflect the cost of operations of the 11 commercial properties acquired
                   in the Exchange (before cost of management)...............................                      3,249
                *  reflect the cost of management for PSP11's two commercial properties and
                   the 11 commercial properties acquired in the Exchange.....................                         93
                                                                                                           --------------
                                                                                                           $       3,271
                                                                                                           ==============


            *  Cost  of  operations-  mini-warehouses  has  been  decreased  to
               eliminate  the  cost  of  operations   with  respect  to  the  11
               mini-warehouse   facilities  and  two  properties   that  combine
               mini-warehouse and commercial space given up through
               the Exchange..................................................................              $      (2,082)
                                                                                                           ==============


            *  Cost of managing  facilities has been decreased to eliminate the
               historical cost of managing the two PSP11  commercial  properties
               and the 11 commercial  properties acquired in the Exchange,  such
               costs are reclassified to Cost of
               operations- commercial properties.............................................              $         (93)
                                                                                                           ==============


</TABLE>
                                       25
<PAGE>
                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)

<TABLE>
<CAPTION>

                                                                                                                (000's)
                                                                                                           ---------------        
          <S>                                                                                             <C>   
           *  A pro forma adjustment has been made to depreciation  expense to eflect the:
                *   Eliminate the historical depreciation expense of PSP11's facilities......              $      (1,198)
                *   Record  depreciation  expense  based on the acquired cost of
                    the  remaining  PSP11  facilities   ($47,553,000   cost,  30%
                    allocated to land, the remaining cost allocated to buildings, 
                    depreciated straight-line over 25 years).............................                           1,344
                                                                                                           --------------

                                                                                                           $         146
                                                                                                           ==============

           *   A pro forma  adjustment  has been made to increase  the minority
               interests'  share of  income  based  upon its pro rata  ownership
               interest in the above pro
               forma adjustments.............................................................              $        (248)
                                                                                                           ==============
</TABLE>
                                       26
<PAGE>
                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)


6.        POST-MERGER PRO FORMA NET INCOME PER SHARE OF COMMON STOCK HAS BEEN
          COMPUTED AS FOLLOWS:
          -------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                                                                              Year Ended
                                                                                                           December 31, 1997
                                                                                                           -----------------

<S>                                                                                                         <C>           
           Post-Merger pro forma net income.......................................................          $   23,052,000


           Post-Merger pro forma weighted average common shares (1)...............................              18,570,827

           Pro forma net income per share of Common Stock.........................................          $         1.24


- -----------------------------------------------------------------------------------------------------------------------------------
           (1)
           Pre-Merger pro forma weighted average shares from Note 4 above..........................             16,287,390

           PSP11's Series A shares (see Note 4 to the Pro Forma Consolidated Balance Sheet)........              1,713,782

           PSP11's Series B and C (see Note 4 to the Pro Forma Consolidated Balance Sheet).........                569,655
                                                                                                               ------------


           Post-Merger pro forma weighted average Common Stock common shares.......................             18,570,827
                                                                                                               ============
7.       MINORITY INTEREST:
         -----------------

         Minority  interest  represents  ownership  interests of OP Units in the
         consolidated  Operating  Partnership which are not owned by PSB. The OP
         Units,  subject  to certain  conditions  of the  Operating  Partnership
         Agreement,  are convertible  into Common Shares of PSB on a one-for-one
         basis.  Pro forma  weighted  average OP Units  outstanding  during each
         period owned by minority  interests  totaled  7,385,529.  The following
         table summarizes the ownership interests:

                                                                                                               Year Ended
                                                                                                           December 31, 1997
                                                                                                           -----------------
                                                                                                                  
           Pro forma PSB Common Shares outstanding.................................................             18,570,827
           Pro forma OP Units owned by minority  interests which are convertible
            into PSB Common
             Shares...............................................................................               7,385,529
                                                                                                               ------------
           Total PSB Common Shares outstanding assuming conversion of OP Units.....................             25,956,356
                                                                                                               ============

           Percentage ownership of PSB Common Shares outstanding...................................               71.5%
           Percentage ownership of minority interests..............................................               28.5%
                                                                                                               ------------
                Total ownership interest...........................................................              100.0%
                                                                                                               ============

</TABLE>
                                       27

                                                                    Exhibit 10.1

                     REAL ESTATE PURCHASE AND SALE AGREEMENT


                                 by and between

                   PETULA ASSOCIATES, LTD. AND EQUITY FC, LTD.
                                     SELLER



                                       and



                             PS BUSINESS PARKS, L.P.
                                      BUYER








    Exhibits to this Agreement have been omitted and will be furnished to the
                Securities and Exchange Commission upon Request







<PAGE>

                                    INDEX TO

                     REAL ESTATE PURCHASE AND SALE AGREEMENT





1. Property Included in Sale...............................................1


2. Purchase Price/Remedies.................................................2


3. Title to the Property...................................................3


4. Seller's Pre-Closing Deliveries.........................................4


5. Buyer's Due Diligence...................................................4


6. Buyer's Conditions to Closing...........................................5


7. Seller's Conditions to Closing..........................................6


8. The Closing.............................................................8


9. Representations and Warranties..........................................13


10. Responsibility for Violations..........................................19


11. Maintenance of Insurance...............................................19


12. Casualty or Condemnation...............................................19


13. Indemnification........................................................20



<PAGE>

14. Condition of Property..................................................20


15. Possession.............................................................21


16. Tax-Deferred Exchange..................................................22


17. Miscellaneous..........................................................22


18. Escrow Agent...........................................................26


<PAGE>

                     REAL ESTATE PURCHASE AND SALE AGREEMENT

     THIS REAL ESTATE  PURCHASE AND SALE AGREEMENT (the  "Agreement") is made as
of the 30th day of April,  1998 (the "Agreement  Date") which shall be the later
to occur of execution of this Agreement by Buyer or Seller by and between PETULA
ASSOCIATES, LTD. ("Petula"), an Iowa corporation,  and EQUITY FC, LTD., ("Equity
FC"),  an Iowa  corporation,  herein  referred to as  "Seller",  and PS BUSINESS
PARKS,  L.P.  (formerly  known as AMERICAN  OFFICE  PARK  PROPERTIES,  L.P.),  a
California limited partnership, herein referred to as "Buyer."

                                R E C I T A L S:

     WHEREAS,  each  Seller  desires to sell its  undivided  interest in certain
improved and unimproved  real property along with certain  related  personal and
intangible  property,  and Buyer  desires to purchase  said real,  personal  and
intangible property on the terms and conditions set forth herein;

     NOW,   THEREFORE,   in  consideration  of  the  foregoing  and  the  mutual
undertakings  set forth  herein,  and for good and valuable  consideration,  the
receipt and  sufficiency of which is hereby  acknowledged,  the Buyer and Seller
hereby agree as follows:

     1.  PROPERTY  INCLUDED IN SALE.  Seller hereby agrees to sell and convey to
Buyer,  and Buyer hereby agrees to purchase  from Seller,  at the price and upon
the terms and conditions set forth in this Agreement, the following:

          (a) that certain real property more particularly  described in EXHIBIT
A attached hereto (the "Real Property");

          (b) all right, title and interest of Seller in all rights, privileges,
alleys,  strips and gores,  rights of way and easements  appurtenant to the Real
Property,  including,  without  limitation,  all  minerals,  oil,  gas and other
hydrocarbon  substances as well as all development  rights,  air rights,  water,
water rights (and water  stock,  if any)  relating to the Real  Property and any
easements,  rights-of-way  or other  appurtenances  used in connection  with the
beneficial use and enjoyment of the Real Property;

          (c) all  improvements  and  fixtures  located  on the  Real  Property,
including all buildings and  structures  presently  located on the Real Property
listed on  SCHEDULE A, as more  particularly  described  in EXHIBIT A,  attached
hereto,  and all related  facilities,  amenities,  all apparatus,  equipment and
appliances  used in  connection  with the  operation  or  occupancy  of the Real
Property,  such as heating and air  conditioning  systems and facilities used to
provide any utility

<PAGE>


services,  refrigeration,  ventilation,  garbage  disposal,  recreation or other
services on the Real Property (all of which are collectively  referred to as the
"Improvements");

          (d) all tangible or intangible  personal  property owned by Seller and
used  in  the  ownership,   use  or  operation  of  the  Real  Property   and/or
Improvements, including, without limitation, the right to use any trade name now
used in  connection  with the Real Property (the  "Personal  Property")  and any
contract or lease rights, agreements, utility contracts or other rights relating
to the ownership, use and operation of the Real Property.

          (e) all of Seller's interest as lessor in all leases covering the Real
Property and Improvements,  including all tenant security and other deposits and
interest earned thereon and prepaid rent and interest  earned thereon.  Interest
on deposits and prepaid rents shall only be  transferred  to Buyer if applicable
state  law or  the  applicable  lease  requires  that  such  funds  be  held  in
interest-bearing accounts.

            All of the items referred to in  Subsections  (a), (b), (c), (d) and
(e) above are hereinafter collectively referred to as the "Property."

     2. PURCHASE PRICE/REMEDIES
        -----------------------

          (a) The total purchase  price (the "Purchase  Price") for the Property
is  Seventy-seven   Million  Seven  Hundred  Fourteen   Thousand  Seven  Hundred
Seventy-five and 09/100 Dollars  ($77,714,775.09)  allocated as follows:  Petula
($53,131,726.60) and Equity FC  ($25,583,048.49).  The Purchase Price is payable
by wire transfer of immediately  available funds in U.S. dollars via the federal
bank wire transfer system to Chicago Title Insurance Company, San Francisco, CA,
(the "Title Company") as follows:

               (i) $76,714,775.09 at Closing; and

               (ii)  $1,000,000,  which  shall be placed in an  interest-bearing
escrow account with the Title Company and shall be released on the date on which
the City of Beaverton,  Oregon ("Beaverton"),  confirms in a non-appealable form
that not less than 199,989 rentable square feet of space ("FAR") can be built on
the  approximately  12.6 acres of land  comprising a part of the  Property  (the
"Development  Parcel");  provided,  in the event Beaverton  determines that less
than 199,989 net rentable  square feet of space can be built on the  Development
Parcel, the escrow amount,  including interest earned thereon, shall be released
to Seller  and  Buyer as  follows:  (A) an amount to Buyer  equal to (x) one (1)
minus a fraction,  the numerator of which is the total FAR which can be built on
the Development  Parcel,  divided by 199,989,  times (y) 100, times (z) $38,462;
and (B) an amount equal to the balance to the Seller; provided, if Beaverton has
not confirmed in a final  non-appealable  order the total FAR which may be built
on the  Development  Parcel within twelve months of the date hereof,  the escrow
amount,  including  the  interest  earned  thereon,  shall be released to Buyer.
Seller and Buyer shall  cooperate in obtaining the  aforesaid  FAR  confirmation
from Beaverton.

                                       2
<PAGE>

     3. TITLE TO THE PROPERTY.
        ---------------------

          (a) At the  Closing,  Seller  shall  convey to Buyer  and Buyer  shall
accept title to the Property in fee simple in accordance  with the terms of this
Agreement, and Buyer's obligation to accept said title shall be conditioned upon
Buyer then being conveyed good and clear record,  marketable and insurable title
(in fee simple) to the Real  Property,  all  rights,  privileges  and  easements
appurtenant thereto, and to the Improvements,  by duly executed and acknowledged
special  warranty deed - statutory  form.  It shall be a condition  precedent to
Buyer's  obligation to close  hereunder  that the Title Company  stands ready to
issue,  at the Closing an ALTA standard  full  coverage  form Owner's  Policy of
Title Insurance with extended coverage and all endorsements reasonably requested
by Buyer, insuring Buyer's interest in the Property,  dated the date of Closing,
with  liability  in the  amount  of the  Purchase  Price,  subject  only  to the
Permitted Exceptions (the "Title Policy"). The Title Policy shall insure against
all  mechanics'  liens  and  shall  have full  survey  coverage  and shall be an
extended coverage policy insuring against, among other things, mechanics' liens,
easements  and claims of parties in possession  not shown by the public  records
with all general and standard exceptions  deleted.  Seller shall pay the cost of
the standard owner's policy.  Buyer shall bear the expense for extended coverage
and the cost of any endorsements requested by Buyer.

          (b) Buyer  shall,  prior to the  Approval  Date,  provide  Seller with
Buyer's  objections to any matters disclosed by the Commitment,  Title Documents
or Survey.  All matters shown on the Title  Exceptions which are not objected to
by Buyer prior to the  Approval  Date shall be  "Permitted  Exceptions".  Seller
agrees  to use its best  efforts  to  satisfy  such  objections  noted by Buyer,
provided that:  (i) Seller shall obtain a satisfaction  and release or bond over
any monetary liens,  in a manner  reasonably  satisfactory to Buyer,  including,
without limitation,  any and all mortgages,  mechanics' liens and judgment liens
(collectively,  "Monetary  Liens");  and (ii) Seller  shall not be  obligated to
litigate or spend more than  $10,000.00  in the  aggregate to cure  non-monetary
lien  objections or to seek any cure which cannot be allowed within fifteen (15)
days.  Seller shall notify  Buyer of Seller's  proposed  actions to satisfy such
objections, and shall have up to the Closing Date to satisfy such objections and
the Closing  Date shall be extended a reasonable  period of time,  not to exceed
fifteen (15) days, if necessary to allow such cure period.  If, despite its best
efforts to do so, Seller cannot satisfy such objections (other than the Monetary
Liens,  which  shall be  satisfied  or bonded  over by  Seller) on or before the
expiration  of such  additional  fifteen  (15) day period,  Buyer shall have the
option to waive its  objection(s)  to such  title  and/or  other  defect(s)  and
proceed to Closing or terminate this  transaction.  Buyer  acknowledges that the
termination of the  transaction  pursuant to this section of the Agreement shall
not entitle Buyer to receive  reimbursement  for third party expenses or to seek
specific performance or any other legal or equitable remedy against Seller.


                                       3
<PAGE>


     4. SELLER'S PRE-CLOSING DELIVERIES
        -------------------------------

          Buyer  acknowledges  that prior to execution of this Agreement  Seller
has  delivered  the items listed in Schedule B for Buyer's  review and approval.
Seller shall be under no further obligation to deliver additional items to Buyer
unless Buyer requests such items prior to the Approval Date and such  additional
items are reasonably  necessary to complete Buyer's due diligence.  Seller shall
only be obligated to provide such  additional  items if: (i) the items requested
are in Seller's or Seller's  property  manager's  actual  possession or control;
(ii) the items are not  privileged;  and (iii) Buyer has identified the specific
property for which the item is requested.

     5. BUYER'S DUE  DILIGENCE.  Buyer shall be allowed to conduct the following
due diligence prior to purchasing the Property:

          (a) Review and approve title to the Property as shown on a preliminary
title report (the "Title Report") from the Title Company.

          (b) Review and approve the  operating  statements  of the Property for
the previous two (2) calendar years as well as the current calendar year-to-date
and audited  financial  statements for 1997,  provided same are available and in
Seller's actual possession.

          (c) Review and approve true, correct and complete copies of all tenant
leases  relating to the Property and a certified rent roll of even date herewith
in the form attached hereto as EXHIBIT B, (the "Certified Rent Roll").

          (d) Review and approve copies of any site plans and building  drawings
and specifications,  existing  environmental  reports,  construction  estimates,
design  agreements  and land purchase  contracts  currently in the possession or
control of the Seller.

          (e)  Review  and  approve  copies  of  any   maintenance  and  service
agreements currently in force.

          (f) Review and approve an as-built  survey showing the location of all
improvements and recorded easements on the Property.

          (g) Performance of a feasibility study of the Property, including, but
not  limited  to,  review  and  approval  of  the  physical  and   environmental
characteristics  and condition of the Property and  performance of marketing and
feasibility  studies,  structural and  engineering  investigations,  auditing of
books and  records of the  Property,  financial  analyses  and  verification  of
existing   zoning..   Seller   agrees  to  provide  Buyer  and  its  agents  and
representatives  reasonable  access to the Property  and to all books,  records,
files,  financial  data,  leases and  contracts  relating to the Property and to
reasonably  cooperate in such  examinations and to cause the property manager to
reasonably  cooperate in such examinations  following the Agreement Date for the
purpose of performing,  at Buyer's sole cost and expense,  the  above-referenced

                                       4
<PAGE>

studies,  physical  inspections,  investigations  and tests on the Property (the
"Tests") provided that no such tests shall be conducted without at least two (2)
business days prior written  notice to Seller and if any such tests are invasive
Seller's prior approval of such Tests,  which approval shall be in Seller's sole
and absolute discretion.  Notwithstanding anything herein to the contrary, Buyer
shall  not need  Seller's  further  consent  to  conduct  Phase I  environmental
studies. Buyer's access is further conditioned on Buyer complying with the terms
of the Access and Indemnification  Agreement attached hereto as Exhibit E. Buyer
shall be  required  to  conduct  such  Tests in a manner  as to not  disturb  or
interfere  with the  current use of the  Property  and upon  completion  of such
Tests, Buyer agrees at its sole cost to restore the Property to the condition it
was in immediately prior to such Tests, including, but not limited to the prompt
removal of anything placed on the Property in connection with such Tests. Copies
of any third party reports,  letters or other written information generated as a
result of such Tests  shall be provided  to Seller if the sale  contemplated  by
this Agreement does not close for any reason other than Seller's default.  Buyer
shall  indemnify,  defend  (with  counsel  reasonably  satisfactory  to Seller),
protect, and hold Seller harmless from and against any and all liability,  loss,
cost, damage, or expense (including,  without limitation,  reasonable attorney's
fees and costs) which Seller may sustain or incur by reason of or in  connection
with any Tests made by Buyer or Buyer's agents or contractors  relating to or in
connection  with the Property,  or entries by Buyer or its agents or contractors
onto  the  Property.  Notwithstanding  any  provision  to the  contrary  in this
Agreement, the indemnity obligations of Buyer under this Agreement shall survive
any  termination  of this Agreement or the delivery of the deed and the transfer
of title pursuant to this Agreement.

               The items  referred to above in  SUBSECTIONS  5(A)-(G)  and those
listed on SCHEDULE B shall be  collectively  referred  to as the "Due  Diligence
Items." Buyer acknowledges that Seller has provided Buyer with the Due Diligence
Items prior to execution of this Agreement.

               The date this  Agreement is executed by both parties shall be the
"Approval Date" and upon such execution there shall be a conclusive  presumption
that  Buyer  has  approved  the  Due  Diligence   Items  and  the  physical  and
environmental  condition of the Property.  Notwithstanding the foregoing,  Buyer
shall be entitled to rely upon the  representations and warranties of the Seller
set forth in this Agreement.

     6. BUYER'S CONDITIONS TO CLOSING.  The following  conditions are conditions
precedent to Buyer's obligation to purchase the Property:

          (a)  Seller  shall  conduct  business  at the  Property  in a good and
diligent manner  consistent with Seller's current  business  practices and shall
maintain  the  Property  in its present  condition  through the date of Closing,
reasonable wear and tear excepted.

                                       5
<PAGE>

          (b) Seller have  terminated,  at Seller's  sole cost and expense,  all
Service/Equipment  Contracts except to the extent Buyer has given Seller written
notice that certain  Service/Equipment  contracts  should be continued and Buyer
has assumed post Closing  liability for such contracts,  however,  such services
shall be continued at Seller's expense until the Closing Date.

          (c) The Title  Company  shall stand ready to issue the Title Policy in
the form required herein.

          (d) Delivery by Seller at Closing of the Closing  Documents  described
in Section 8 hereof.

          (e)  Performance  by Seller as and when required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Seller  pursuant to this  Agreement and all of Seller's  representations  and
warranties  contained in this  Agreement  shall be true and correct on and as of
the Closing Date as if made anew on that date.

          (f)  Delivery by Seller of Tenant  Estoppel  Certificates  in the form
attached  hereto as  Exhibit F for  tenants  comprising  at least 80% of the net
rentable square feet of the Property,  which shall include all tenants listed on
Exhibit F-1, the  substance  and content of which shall be  consistent  with the
Certified  Rent Roll and Seller  shall use  commercially  reasonable  efforts to
obtain the required  Tenant  Estoppel  Certificates.  Buyer shall cooperate with
Seller post Closing to complete  collection  of Tenant  Estoppels.  In the event
sufficient  Tenant  Estoppels  cannot be  obtained,  Buyer shall accept a Seller
Estoppel in the form attached  hereto as Exhibit F-2 and all post Closing Tenant
Estoppels shall be delivered  pursuant to the terms of Exhibit F-2. In the event
that the  conditions  set forth above in this Section 6 are not  satisfied  (and
Buyer is not  otherwise  in  default  of this  Agreement),  Buyer  may  elect to
terminate this Agreement or waive satisfaction of the condition and close escrow
in either instance by giving written notice to Seller.

     7. SELLER'S CONDITIONS TO CLOSING.  The following conditions are conditions
precedent to Seller's obligation to sell the Property:

          (a)  Delivery  by Buyer  at  Closing  of the  Purchase  Price  and the
executed  Assignment  and  Assumption of Leases in the form  attached  hereto as
Exhibit G.

          (b)  Performance  by Buyer as and when  required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Buyer pursuant to this Agreement.

               In the  event  that  the  conditions  in this  Section  7 are not
satisfied, Seller may elect, at its sole discretion, to terminate this Agreement
or waive satisfaction of the condition and close escrow.


                                       6
<PAGE>
                                       7
<PAGE>

     8. THE CLOSING

          (a) The Closing  hereunder  shall be held and delivery of all items to
be made at the Closing  under the terms of this  Agreement  shall be made at the
offices of the Title Company on April 30, 1998, or such other date prior thereto
as Buyer and Seller may mutually  agree in writing (the  "Closing  Date").  Such
date may not be extended  without the prior written  approval of both Seller and
Buyer.  In the event the Closing  does not occur on or before the Closing  Date,
the Title Company  shall,  subject to the provisions of Section 2, and unless it
is  notified  by both  parties to the  contrary,  within five (5) days after the
Closing  Date,  return  to the  depositor  thereof  items  which  may have  been
deposited  pursuant  to this  Agreement.  Any such  return  shall not,  however,
relieve  either  party  hereto  of any  liability  it may have for its  wrongful
failure to close. The delivery to the Escrow Agent of the Closing Documents,  as
hereinafter  defined,  by both parties and the Purchase  Price by Buyer shall be
deemed sufficient to effect a closing under Section 8(a).

          (b) At or before  the  Closing,  Seller  shall  deliver  to escrow the
following (collectively, the "Closing Documents"):

               (i) special  warranty  deed - statutory  form,  conveying  to the
Buyer the Property as required by Section 3 above in the form attached hereto as
Exhibit I;

               (ii) originals or, if Seller does not have  originals,  certified
true, complete and correct copies of all leases (and amendments thereto, if any)
in Seller's actual and physical possession covering any portion of the Property,
any  security  deposits  relating  thereto,   and  an  executed  Assignment  and
Assumption of Lease in the form attached hereto as Exhibit G;

               (iii) a Bill of Sale, in the form attached hereto as Exhibit J;

               (iv) a  certificate  by  Seller  to the  effect  that  all of the
representations,  warranties  and covenants set forth in this  Agreement  remain
true, correct and complete as of the Closing Date;

               (v) a Certified Rent Roll in the form attached  hereto as Exhibit
B, dated as of the date of Closing Date  consistent  with prior  Certified  Rent
Rolls and Tenant Estoppel Certificates;

               (vi)  such  title   affidavits  or  other  documents  as  may  be
reasonably required by the Title Company with copies thereof to the Buyer;

               (vii) all rent records and related documents in the possession or
under the  control of Seller.  Such  records  may include a schedule of all cash
deposits  and a check  or  credit  to  Buyer  in the  amount  of such  deposits,
including any interest  thereon (to the extent that applicable  state law or the
applicable lease requires payment of interest on such amounts) held by Seller at
the Closing under the Lease. To the extent any deposits are in a form other than
cash, such deposits shall be transferred to Buyer at Closing without recourse.

                                       8
<PAGE>

               (viii) To the extent in Seller's possession or control, originals
or copies of all current site plans, surveys,  architectural drawings, plans and
specifications,  engineering  plans and  studies,  floor  plans,  soil  reports,
environmental  studies,  and  landscape  plans.  To the extent such items are in
Seller's  possession  or control,  Seller shall also deliver (i)  originals  (or
copies,  if originals are not then  available) of all then effective  assignable
guaranties,  warranties and/or payments and performance bonds made by any person
for the benefit of Seller with respect to the Property of any of its components,
together with an instrument  assigning  such  guaranties and warranties to Buyer
and (ii)  originals  (or copies,  if originals  are not then  available)  of all
certificates,  Licenses, permits authorizations and approvals issued for or with
respect to the  Property  by  governmental  and  quasi-governmental  authorities
having  jurisdiction,  to the extent  such items are in Seller's  possession  or
control.

               (ix) to the extent available,  originals (or copies, if originals
are not  available)  of all  documents  and books and records  necessary for the
continued operation of the Project,  including without  limitation,  rent rolls,
lease files,  rent records,  escalation  records and statements and  maintenance
records;

               (x) an original resolution of Seller authorizing the execution of
this Agreement,  the conveyance documents and all other documents to be executed
by Seller and the performance by Seller hereunder;

               (xi) Seller's  Non-Foreign  Certification in the form attached as
EXHIBIT C; and

               (xii) notices to the tenants at the Property in the form attached
as EXHIBIT D,  executed by Seller  informing  them of the change in ownership of
the Property.

               (xiii) an executed Assignment of Warranties and Guaranties in the
form attached as Exhibit O.

               Buyer may waive  compliance  on  Seller's  part  under any of the
foregoing items by an instrument in writing.

          (c) At or before  the  Closing,  Buyer  shall  deliver  to escrow  the
Purchase  Price,  as adjusted for  prorations,  and an executed  Assignment  and
Assumption of Leases in the form attached hereto as EXHIBIT G.

          (d) Seller and Buyer shall each deposit such other  instruments as are
reasonably  required by the escrow holder to close the escrow and consummate the
purchase of the Property in accordance with the terms hereof.

                                       9
<PAGE>

          (e) The following items shall be prorated separately for each property
identified on SCHEDULE A as of 11:59 p.m. on the date immediately  preceding the
Closing Date and the net amount  thereof shall be added to or deducted  from, as
the case may be, the amount of the Purchase Price to be paid at the Closing:

               (i) general real estate,  personal  property and ad valorem taxes
and assessments  for the current tax year of the Property.  If any such taxes or
assessments  are  payable in  installments,  all  installments  due  through the
Closing  together with the accrued but unpaid portion of any other  installments
not yet due as of the Closing shall be paid for by the Seller;

               (ii) taxes,  water,  sewer and front foot  benefit  charges,  and
charges for electricity, gas, telephone and other utilities and license fees;

               (iii)  rent and other  charges  under the  Leases  (to the extent
monies have actually been collected therefor), including any free rent under any
of the  Leases;  Buyer  shall  receive a credit at Closing  for any free rent or
other tenant concessions due under any Lease subsequent to Closing;

               (iv) all other income and expenses relating to the Property;

               (v) any other items that are customarily prorated in transactions
of this nature;  and (vi) any and all cash security  deposits,  prepaid rent and
all interest  earned thereon (to the extent  interest is payable to tenant under
applicable  state  law or the  applicable  lease)  shall be a credit to Buyer at
Closing.  Seller shall be fully  liable for any wages and other  amounts due and
owing  any  employees  at the  Property  which  have  accrued  up to the date of
Closing.  Seller shall retain and Buyer shall not be entitled to any credit for,
the  deposits,  if any,  made by  Seller in  connection  with the  provision  of
electric, sewer, water, telephone and other utility services to the Property.

     For  purposes  of  calculating  prorations,  Buyer shall be deemed to be in
title to the  Property,  and,  therefore,  entitled to the income  therefrom and
responsible  for the expenses  thereof for the entire day upon which the Closing
occurs.  All such prorations  shall be made on the basis of the actual number of
days of the month  which  shall have  elapsed as of the date of the  Closing and
based upon the actual number of days in the month and a three hundred sixty-five
(365) day year. The amount of such  prorations  shall  initially be performed by
Seller and  mutually  agreed to by the parties  prior to  Closing,  but shall be
  
                                     10
<PAGE>

subject to  adjustment  in cash after the Closing  outside of escrow as and when
complete and accurate information becomes available,  if such information is not
available at the Closing. Seller and Buyer agree to cooperate and use their best
efforts to make such adjustments no later than sixty (60) days after the Closing
(except with  respect to property  taxes,  which shall be adjusted  within sixty
(60) days after the tax bills for the applicable period are received).

     Buyer shall,  post Closing  based on April 30, 1998  receivables,  purchase
accounts receivable relating to the Property from Seller at a price equal to the
following percentage of such outstanding accounts receivable:

          100% of the amount of accounts  receivable  less than 31 days old; and
          0% of the amount of accounts receivable over 30 days old;

     The term  "Rent"  as used  herein  shall  mean  all  rents,  including  any
percentage rent and any accrued tax and operating  expense  escalation,  charges
and other revenue of any kind generated  from or in connection  with the Leases.
Except as set forth in this Section  8(e)(vii),  all items of income and expense
which  accrue for the period  prior to the  Closing  will be for the  account of
Seller and all items of income and  expense  which  accrue for the period on and
after the Closing will be for the account of Buyer. Buyer shall receive a credit
against the  Purchase  Price for all amounts of Rent which are  allocable to the
period on and after the Closing and which have  accrued as of the Closing  Date,
including  those Rents which have accrued but remain  uncollected as of the date
of Closing. The provisions of this Section 8(e)(vii) shall survive the Closing.

               (viii)  With  respect  to  expenses  of the  Property  which  are
chargeable  to the tenants  pursuant to the  provisions  of the Leases (the "CAM
Charges"),  Seller  shall  determine  (1) the amount of those  expenses  paid or
payable by Seller from January 1 in the year in which the Closing occurs through
the date of Closing or, with regard to taxes and assessments,  the amount of the
proration  thereof  charged to Seller and (2) the  amount  tenants  have paid to
Seller  from  January 1 in the year in which  Closing  occurs  until the date of
Closing as the  tenants'  pro rata share of such  tenant  expenses.  If accurate
allocations of CAM Charges, accounts receivable, or any other expenses cannot be
made at Closing  because  current  bills are not  obtainable,  the parties shall
allocate  such  expenses  at  Closing on the best and most  current  information
available,  subject to adjustment in cash as soon as reasonably  possible  after
the Closing when final bills or other  evidence of the  applicable  expenses are
received,  but such adjustment  shall be made no later than six (6) months after
the Closing  Date.  Buyer shall also be entitled to a credit at Closing equal to
any CAM  Charges  for 1997 and prior years which are owing to any of the tenants
of the Property.  The  provisions of this Section  8(e)(viii)  shall survive the
Closing.

               (ix) Those items described in the Settlement  Statement  executed
by the parties hereof of even date herewith.

          (f) The costs  incurred  in this  transaction  shall be  allocated  as
follows:

                                       11
<PAGE>

               (i) Seller shall pay standard  rates for the Title Policy.  Buyer
shall pay for any title endorsements and extended coverage. Seller shall pay all
transfer taxes associated with the sale.

               (ii) Buyer shall pay the cost of recording fees applicable to the
sale.

               (iii) Buyer shall pay the cost of the updated survey.

               (iv) Each party shall pay its own legal fees and expenses and 50%
of all escrow charges.

               (v) Seller shall pay all costs  associated  with the Tax Deferred
Exchange (as described in Section 16 hereof).

               (vi) Seller shall pay for local improvement district assessments,
farm or timber real property tax deferrals, if any.

          (g) As additional  consideration  for Buyer's  purchasing the Property
and paying the Purchase Price to the Seller,  Seller hereby covenants and agrees
to  remain  fully  liable  for  the   performance  and  payment  of  all  tenant
improvements and the payment of all leasing commissions  currently due and owing
(including  any  delinquent  amounts)  under  any of the  Leases  and  under any
leasing/commission  agreement  up to the Closing  Date except for amounts  which
shall  hereafter  be due  and  owing  under  any  of the  Leases  or  under  any
leasing/commission agreement, including, without limitation, leasing commissions
with  respect to any option to renew or extend the Leases,  (it being  expressly
understood  and agreed that Buyer is assuming the  obligations to perform or pay
for any tenant improvements,  and to pay for any leasing commissions which shall
hereafter be owing under any renewals or  extensions  of the Leases or under any
leasing/commission agreement before or after the Closing Date which are approved
by Buyer); (ii) for any New Leases approved by Buyer.

          (h) Each party hereto shall indemnify, defend and hold the other party
(together with its officers, directors, and employees) harmless from and against
all claims, demands, causes of actions,  judgments,  damages, costs and expenses
(including,  without limitation,  reasonable,  actual attorneys' fees and courts
costs),  deficiencies,  settlements and investigations  which relate to matters,
actions or omissions  which arise out of or are based upon any of the  following
during such parties'  period of ownership,  which for Seller shall be the period
of time prior to Closing  and for Buyer  shall be the period of time on or after
Closing:

               (i) any obligation  under any contracts,  agreements and writings
entered into by or on behalf of such party in respect of the use,  construction,
operation,  ownership,  occupancy or  maintenance of any portion of the Property
arising out of an event occurring during such parties' period of ownership;

                                       12
<PAGE>

               (ii) any accident,  injury,  death or damage whatsoever caused to
any person or entity or loss of property,  occurring in or about the Property or
any part thereof,  or on any other property  connected with or adjacent  thereto
during such parties' period of ownership; or

               (iii) any breach of the  covenant set forth in Section  8(g),  or
with respect to any payment or  performance  obligation  under any of the Leases
for tenant  improvements  or under any of the Leases  and/or  leasing/commission
agreements for leasing commissions which have heretofore accrued,  which are now
due and owing or which shall hereafter accrue, as described in Section 8(g).

               (iv) any breach of a representation or warranty set forth in this
Agreement.

               (v)  Notwithstanding  the above but subject to the limitations on
Seller's  indemnity set forth in Section 8(g),  Seller shall not be  indemnified
for any  leasing  commissions  which are payable  subsequent  to the Closing and
relate  to  leases  in  force  on  the  date  hereof,  including  those  leasing
commissions  listed on Schedule C, and Buyer shall not be obligated to indemnify
Seller for  Service/Equipment  Contracts (as hereinafter  defined) which are not
assumed by the Buyer at Closing.

     9.  REPRESENTATIONS AND WARRANTIES.  "To the best of Seller's knowledge" or
other   references   herein  to  Seller's   knowledge   means  the  actual  (not
constructive)  knowledge  which  Mike  Duffy and Doug  Kintzle  have  based upon
reasonable  familiarity with the property records and continued involvement with
the Property.  Notwithstanding the foregoing,  the term "to the best of Seller's
knowledge"  shall not be construed to imply any covenant  that such  individuals
have  conducted  any  review of files or other  inquiry in  connection  with the
transaction   contemplated  by  this  Agreement.   Furthermore,   the  foregoing
individuals  are acting in the  capacity  as agents or  employees  of Seller and
shall have no personal liability with respect to any representations, warranties
or covenants of Seller in this Agreement.

          (a) Seller  hereby  represents  and  warrants  to Buyer as of the date
hereof and as of the date of Closing as follows:

               (i) Seller is a corporation  duly organized and validly  existing
under  the laws of the State of Iowa and is in good  standing  under the laws of
the State of Oregon.

               (ii) Ownership.
                    ---------

                    (A)  Seller is the owner of the  Property  of record  and in
fact, legally and beneficially,  and to the best of Seller's  knowledge,  Seller
has good, marketable and insurable title to the Property.

                    (B) No person or  entity  other  than  Seller  and  Seller's
affiliates  has any interest in the legal or  beneficial  title to the Property;
there are no options to  purchase  the  Property  which are  effective,  nor has
Seller  previously  entered into any other  contract of sale or agreement of any
kind with a party other than Buyer which is presently  effective  and which will
  
                                     13
<PAGE>

not be terminated before the date of this Agreement,  except the Meredith letter
of intent as further  explained  in Section  9(a)(xv)(A).  After the date hereof
Seller will not enter into any agreement or contract or negotiate with any party
other  than  Buyer  with  respect  to the sale of the  Property,  nor enter into
financial  arrangements of any kind with respect to the Property nor will Seller
pledge or assign any right,  title,  interest in or to the  Property or any part
thereof to any person or entity.

               (iii) Leases.

                    (A) As of the date of the  Agreement  there  are no  leases,
subleases,  licenses or other rental agreements or occupancy agreements (written
or verbal) which grant any  possessory  interest in and to any space situated on
or in any of the  Property or that  otherwise  give rights with regard to use of
any  portions  of any of the  Property  other than the Leases  described  in the
Certified  Rent Roll,  as set forth in Exhibit B attached  hereto (said  leases,
together with any and all amendments,  modifications and supplements thereto and
guarantees thereof, are herein referred to collectively as the "Leases");

                    (B) The  copies of the  Leases  provided  to Buyer are true,
accurate  and  complete,  are in full force and effect and none of them has been
modified, amended or extended;

                    (C) There are no security  deposits or other  deposits other
than those listed on SCHEDULE D.

               (iv) Service and  Management  Contracts.  To the best of Seller's
knowledge, except as set forth on SCHEDULE E, neither Seller nor any other party
has entered into any construction,  design, engineering,  service,  maintenance,
supply, brokerage/leasing agreements, employee agreements,  management contracts
or Leases of personal  property  (collectively,  "Service/Equipment  Contracts")
affecting the construction, use, ownership,  maintenance and/or operation of the
Property that will continue  subsequent to the Closing.  Seller shall terminate,
at Seller's sole cost and expense, all  Service/Equipment  Contracts which Buyer
does not elect to assume in writing prior to the expiration of the Study Period.
All work  required  to be  performed  by Seller in  connection  with all Service
Equipment  Contracts or other contracts or requirements  with respect to periods
prior to the date of Closing  has been or will be fully  performed  and that all
such bills in connection with such work will be Seller's responsibility.  Seller
is not in default and to best of Seller's knowledge no other party is in default
under the Service/Equipment Contracts.

               (v) Hazardous Substances.  To the best of Seller's knowledge, (i)
the  Property  has not  been  used for the  generation,  treatment,  storage  or
disposal of any hazardous substances during the period in which Seller has owned
the  Property;  and (ii) there are no  underground  storage  tanks located on or

  
                                     14
<PAGE>
under  the  Property.  For the  purposes  of this  Section  9(a)(v),  "hazardous
substances" shall include "hazardous substances" as defined in the Comprehensive
Environmental  Response  Compensation and Liability Act of 1980, as amended,  42
U.S.C.  ss.ss.  9601 et. seq., and regulations  adopted pursuant to said Act, or
any similar  environmental  protection law of the state in which the Property is
located or its political subdivisions.

               (vi)  Ability  to  Perform.  Seller  has full  power to  execute,
deliver and carry out the terms and  provisions of this  Agreement and has taken
all necessary  action to authorize the  execution,  delivery and  performance of
this  Agreement,  and this Agreement  constitutes  the legal,  valid and binding
obligation  of  Seller  enforceable  in  accordance  with its  terms.  No order,
permission,   consent,  approval,   license,   authorization,   registration  or
validation  of, or filing  with,  or  exemption  by,  any  governmental  agency,
commission,  board or public authority is required to authorize,  or is required
in connection with, the execution, delivery and performance of this Agreement by
Seller or the taking by Seller of any action contemplated by this Agreement.

     The execution and delivery of this Agreement and the closing  documents and
the consummation of the transactions  contemplated  hereby will not result in or
constitute  any of the following:  (i) a default,  breach,  or violation,  or an
event that, with notice or lapse of time or both, would be a default, breach, or
violation,  of the  organizational  documents of Seller or any of the  following
with  respect to Seller or the  Property:  any  agreements,  contracts,  leases,
promissory  notes,   conditional  sales  contracts,   commitments,   indentures,
mortgages,  deeds of trust, or other agreements,  instruments or arrangements to
which  Seller is a party or by which it or the Property is bound and that relate
to the  Property;  (ii) a violation of or conflict with any term or provision of
any  judgment,  decree,  order,  statute,  injunction,  rule or  regulation of a
governmental  unit  applicable to Seller or the Property;  (iii) the creation or
imposition  of any lien,  charge or  encumbrance  on the  Property;  or (iv) not
require approval, waiver or authorization from a governmental or regulatory body
which has not been obtained.

               (vii)  Compliance  with Laws,  Etc.  Neither the entering into of
this Agreement nor the consummation of the transaction  contemplated hereby will
constitute or result in a violation or breach by Seller of any judgment,  order,
writ,  injunction or decree issued against or imposed upon it, or will result in
a violation of any applicable law, order, rule or regulation of any governmental
authority.   There  are  no  actions,   suits,   proceedings,   arbitrations  or
investigations pending or threatened against, relating to or affecting Seller or
the Property which might  interfere in a material  respect with the  transaction
contemplated by this  Agreement,  become a cloud on the title to the Property or
any portion  thereof or  otherwise  affect the  Property or Seller's  ability to
consummate the transaction contemplated hereby.

               (viii) No  Violation  Notice.  Except as set forth in SCHEDULE F,
Seller has not received notices:
                                       15
<PAGE>

                    (A) from any federal,  state,  county or municipal authority
alleging any fire, health, safety, building, pollution, environmental, zoning or
other  violation  of law  in  respect  of the  Property  or  any  part  thereof,
including, without limitation, the occupancy or operation thereof, which has not
been entirely corrected;

                    (B) concerning the possible or anticipated  condemnation  of
any part of the Property, or the widening,  change of grade or limitation on use
of streets  abutting the same or  concerning  any special  taxes or  assessments
levied or to be levied against the Property or any part thereof;

                    (C)  concerning  any  change in the zoning or other land use
classification of the Property or any part thereof.

                    (D) of any pending insurance claim.

                    (E)  from any  governmental  authority  that  any  licenses,
permits,  certificates,   easements  and  rights  of  way,  including  proof  of
dedication,  required from any authorities having jurisdiction over the Property
or from private  parties for the existing  use,  occupancy  and operation of the
Property and to insure  vehicular and pedestrian  ingress to and egress from the
Property are in violation of any governmental laws or regulations, which has not
been corrected or will not be corrected by Closing.

               (ix)  No  Management  Contracts,  Employment  Contracts,  Unions,
Pension Plans. Seller has not entered into any management contracts,  employment
contracts  or labor union  contracts  and has not  established  any  retirement,
health  insurance,  vacation,  pension,  profit  sharing or other  benefit plans
relating to the operation or  maintenance  of the Property for which Buyer shall
have any liability or obligation. Seller has no employees at the Property, other
than at-will  employees who shall remain the  responsibility of Seller and as to
whom Buyer shall have no liability or obligation whatsoever.  As of the Closing,
there shall be no employees  working at the Property.  Seller shall have paid or
caused  to be paid to all  employees  of the  Seller  all  salary  and any other
payments which shall be payable on account of each such employee for such period
through Closing. Seller agrees to defend, indemnify and hold Buyer harmless from
any loss, expense,  cost and/or damage (including without limitation  reasonable
attorneys' fees and costs incurred in the defense of such claims) resulting from
claims  well-founded  or  unfounded,  by or on behalf of persons who are to have
been  employees of Seller on or prior to the Closing  arising out of any matter,
cause or thing prior to the Closing or any claims which may have  accrued  prior
to the Closing.

               (x) Seller has not received any written notice of the termination
or impairment of the furnishing of services to the Property of water, sewer, gas
(if any), electric, telephone, drainage and other such utility services.

                                       16
<PAGE>

               (xi) Assessments. Seller has not received notice that assessments
for public  improvements  have been made against the Property  which are unpaid,
including,  without limitation, those for construction of sewer and water lines,
streets,  sidewalks and curbs. To the best of Seller's  knowledge,  there are no
pending  or  proposed  special  assessments  affecting  or which may  affect the
Property or any portion thereof.

               (xii) Pre-Closing Deliveries Accurate. Except with respect to the
Certified  Rent Roll, to the best of Seller's  knowledge,  all of the documents,
writings and other  matters  delivered by Seller to Buyer  pursuant to Section 4
and information provided to Buyer pursuant to the terms of this Agreement, as of
the date hereof, and as of the Closing,  are true,  accurate and complete in all
material  respects and accurately  indicate all of the  information  referred to
therein,  are not  misleading  in any  respect,  and  none  of such  disclosures
misstated any material facts or omitted to state any material facts necessary to
make the  statements  made, in the light of the  circumstances  under which they
were made, not misleading.  This representation  shall be applicable only to due
diligence items listed on Schedule B and not any items delivered thereafter.

               (xiii) Miscellaneous Representations and Warranties.

                    (A) Seller agrees to conduct the business  operations of the
Property in the Seller's usual and normal manner until the Closing. Seller shall
not,  without the prior written consent  thereto of Buyer,  make (or permit) any
physical change in the Property.

                    (B) All bills and claims for labor  performed  and materials
furnished  to or for the benefit of the  Property  for all periods  prior to the
Closing  date  have  been  paid by  Seller  or will be paid by  Seller as of the
Closing.

                    (C) (Intentionally Deleted)

                    (D)  Seller is not a  "foreign  person",  as  defined in the
Internal Revenue Code.

                    (E) The premiums are paid and current for  replacement  cost
insurance  policies on the  Property  and,  to the best of  Seller's  knowledge,
insurance policies are in full force and effect.

               (xiv) All documents  executed by Seller which are to be delivered
to Buyer at the Closing are or at the Closing will be duly authorized,  executed
and delivered by Seller, are or at the Closing will be legal, valid, and binding
obligations of Seller,  are  sufficient to convey title,  and do not violate any
provisions  of any  agreement  to  which  Seller  is a party  or to  which it is
subject.

               (xv) Additional  Representations and Warranties Regarding Parcels
of Land with No Improvements:

                                       17
<PAGE>

                    (A) Contracts. There are no sale, construction,  management,
leasing,  service,  equipment,  supply,  maintenance or concession agreements in
effect with respect to the Property that will survive  Closing.  Notwithstanding
the  above,  Seller has  disclosed  to Buyer the  letter of intent  regarding  a
pending  sale of certain  unimproved  land to the Meredith  Corporation  and the
pending purchase  agreement  negotiations  with the Meredith  Corporation.  Upon
Closing of this transaction, Seller shall terminate the letter of intent.

                    (B)  Commitments.  Other  than as set  forth  in  Exhibit  K
attached  hereto,  Seller  has  not  made  any  commitment  or  proffer  to  any
governmental or quasi-governmental authority having jurisdiction or to any third
party,  to dedicate or grant any portion of the Property  for roads,  easements,
rights-of-way,  park lands or for any other public  purposes,  to construct  any
improvement,  to  grant  any  restrictions  or to incur  any  other  expense  or
obligation relating to the Property.

               (xvi)  Additional  Representation  and Warranties  Regarding Land
Under a Ground Lease: (Intentionally Deleted)

               (xvii)  Additional   Representations  and  Warranties   Regarding
Properties Where Improvements Are Under Construction. (Intentionally Deleted)

               (xviii)  Additional   Representations  and  Warranties  Regarding
Properties with Covenants, Conditions and Restrictions.

                    Seller  represents  and  warrants  that  (i) to the  best of
Seller's  knowledge that the Property  conveyed pursuant to the Agreement is not
in  default  in  the  performance  of any  covenant,  condition  or  restriction
contained in any  Declaration  of  Covenants,  Conditions  or  Restrictions,  as
amended, as more fully described in the Title Policy ("CCRs"),  and no condition
or circumstance  exists which, with the giving of notice or the passage of time,
would constitute a default thereunder;  (ii) no assessments,  payments,  fees or
expenses are  presently  due and payable  under such CCRs;  (iii) Seller  hereby
represents and warrants that none of the property  conveyed hereby is subject to
the terms of a  repurchase  option,  right of first  refusal or other  option to
purchase  such  property,  or  declarant's  right of approval  (individually,  a
"Right";  collectively,  the  "Rights"),  which Right has not lapsed,  fully and
irrevocably,   prior  to  being  exercised  by  the  beneficiary  thereof.  This
representation  and  warranty  shall  survive  for the period of any  applicable
statute of limitations  with regard to such Rights and shall be null and void in
the  event  any such  action  is  triggered  by an  affirmative  action of Buyer
(provided,  however,  the  foregoing is not intended to mean that the statute of
limitations  commences on the date  hereof);  (iv) Buyer and Seller  acknowledge
that all  setback  violations  and  landscaping  violations  with  regard to the
Properties,  if any, have been satisfied by credits at Closing on the Settlement
Statement.  Buyer hereby  agrees that upon  assumption of title it will not take
action to initiate any such option or revoke approval  against the Property;  in
such event  this  representation  shall be null and void and Buyer  shall not be
entitled to claim a Seller default for any action taken by Buyer.

                                       18
<PAGE>

          (b) Buyer hereby  represents  and  warrants to Seller as follows:  (i)
Buyer is a California limited  partnership,  duly organized and validly existing
under the laws of the State of California; all documents executed by Buyer which
are to be  delivered  to Seller at Closing  are or at the  Closing  will be duly
authorized,  executed, and delivered by Buyer, and are or at the Closing will be
legal,  valid,  and binding  obligations of Buyer, and do not and at the Closing
will not violate any provisions of any agreement to which Buyer is a party or to
which it is  subject;  and (ii)  Buyer  shall  furnish  all of the funds for the
purchase of the Property  (other than funds  supplied by  institutional  lenders
which will hold valid  mortgage  liens against the Property) and such funds will
not be from sources of funds or properties derived from any unlawful activity.

     10.  RESPONSIBILITY  FOR  VIOLATIONS.  All notices of  violations  of laws,
ordinances,  or regulations  ("Violations of Law"),  which are received prior to
the  Closing  from  any  governmental   department,   agency  or  bureau  having
jurisdiction  as to  conditions  affecting  the  Property  shall be  remedied or
complied  with by  Seller.  If such  violations  are  subject  to  challenge  or
objection by Seller or are the  obligation of any tenant under the terms of such
tenant's  lease,  Buyer shall  cooperate  with  Seller to defend such  challenge
and/or require tenant to cure the violation.  Seller shall  indemnify  Buyer for
the reasonable  third-party costs of such challenge incurred by Buyer, including
reasonable attorney's fees. This obligation shall survive Closing on the part of
both parties.

     11. MAINTENANCE OF INSURANCE.  Until the Closing, Seller shall maintain its
present insurance on the Property. The risk of loss in and to the Property shall
remain vested in Seller until the recordation of the Deed to Buyer.

     12. CASUALTY OR CONDEMNATION.  If prior to the Closing, the Property or any
"material"  portion thereof is damaged or destroyed by fire or casualty,  or any
part of the Property is taken or threatened to be taken by eminent domain by any
governmental  entity,  then Buyer shall have the option,  exercisable by written
notice given to Seller at or prior to the Closing,  either to (a) terminate this
Agreement,  whereupon all  obligations  of all parties  hereto shall cease,  the
Deposit shall be returned to Buyer and this Agreement  shall be void and without
recourse to the parties hereto except for provisions  which are expressly stated
to survive such  termination;  or (b) proceed with the purchase of the Property,
and in such case,  unless Seller shall have previously  restored the Property to
its condition prior to the occurrence of any such damage or destruction,  Seller
shall pay over or assign to Buyer, without recourse, all amounts received or due
(plus an amount equal to the sum of any  deductible  under any insurance  policy
covering the Property and any  additional  proceeds  which shall be necessary to
effect such restoration) from, and all claims against,  any insurance company or
governmental entity as a result of such destruction or taking, together with any

                                       19
<PAGE>

additional proceeds which shall be necessary to effect such restoration.  Within
five (5) days after receipt of written notice of such casualty or  condemnation,
Buyer will advise  Seller in writing  whether Buyer desires to proceed with this
transaction in light of such casualty or  condemnation.  The term  "material" as
used in this Section 12 shall mean damage or  destruction  in an amount equal to
or greater than 5% of the Purchase Price.

     13. INDEMNIFICATION.  Each party hereby agrees to indemnify the other party
and hold it harmless from and against any and all claims, demands,  liabilities,
costs, expenses,  penalties,  damages and losses, including, without limitation,
reasonable  attorneys' fees, resulting from any  misrepresentations or breach of
warranty or breach of covenant  made by such party in this  Agreement  or in any
document, certificate, or exhibit given or delivered to the other pursuant to or
in connection with this Agreement except as provided herein.

     14. CONDITION OF PROPERTY.  At or before the Approval Date, Buyer will have
approved the physical and  environmental  characteristics  and  condition of the
Property, as well as the economic  characteristics of the Property. Buyer hereby
waives  any  and  all  defects  in  the  physical,  environmental  and  economic
characteristics  and condition of the Property  which would be disclosed by such
inspection  which  exist as of the  Approval  Date  except  such waiver does not
extend  to or  negate  the  effect  of any  matters  which  are  covered  by any
representation, warranty or covenant of Seller in Section 9 of this Agreement or
in any of the conveyance  documents,  Buyer further  acknowledges that except as
set forth in this  Agreement,  neither  Seller nor any of  Seller's  officers or
directors, nor Seller's employees, agents, representatives,  or any other person
or  entity  acting  on behalf of  Seller  (hereafter,  for the  purpose  of this
Section, such persons and entities are individually and collectively referred to
as the  "Seller")  have  made  any  representations,  warranties  or  agreements
(express or implied) by or on behalf of Seller as to any matters  concerning the
Property,  the economic results to be obtained or predicted,  or the present use
thereof or the suitability for Buyer's intended use of the Property,  including,
without  limitation,   the  following:   suitability  of  the  topography;   the
availability  of water  rights or  utilities;  the  present  and future  zoning,
subdivision  and any and all other land use matters;  the condition of the soil,
subsoil,  or  groundwater;  the  purpose(s)  to which the  Property  is  suited;
drainage;  flooding;  access to public  roads;  or  proposed  routes of roads or
extensions   thereof.   Buyer  acknowledges  and  agrees  that  except  for  the
representations and warranties contained herein and in the conveyance documents,
the Property is to be  purchased,  conveyed and accepted by Buyer in its present
condition,  "as is" and that no  patent  or latent  defect  in the  physical  or
environmental  condition  of the  Property  whether or not known or  discovered,
shall affect the rights of either party  hereto.  Except as set forth in Section
9,  any  documents  furnished  to  Buyer  by  Seller  relating  to the  Property

                                       20
<PAGE>

including, without limitation,  service agreements,  management contracts, maps,
surveys,  studies,  pro formas,  reports and other  information  shall be deemed
furnished as a courtesy to Buyer but without warranty from Seller. All work done
by Buyer in  connection  with  preparing  the Property for the uses  intended by
Buyer including any and all fees, studies, reports,  approvals,  plans, surveys,
permits,  and any expenses whatsoever  necessary or desirable in connection with
Buyer's  acquiring,  developing,  using and/or  operating the Property  shall be
obtained and paid for by, and shall be the sole  responsibility of Buyer.  Buyer
has  investigated and has knowledge of operative or proposed  governmental  land
use laws and  regulations to which the Property may be subject and shall acquire
the Property upon the basis of its review and determination of the applicability
and effect of such laws and regulations.

                    Except for the  representations  and warranties in Section 9
of  this   Agreement,   Buyer  has   neither   received   nor  relied  upon  any
representations concerning such land use laws and regulations from Seller.

                    Except for the  representations,  warranties and indemnities
provided by Seller contained  herein and in the documents  delivered at Closing,
Buyer,  on behalf of itself and its  employees,  agents,  successors and assigns
attorneys and other  representatives,  and each of them,  hereby releases Seller
from and  against any and all claims,  demands,  causes of action,  obligations,
damages  and  liabilities  of any nature  whatsoever,  directly  or  indirectly,
arising out of or related to the condition of the Property.

                    By signing in the space  provided  below in this SECTION 14,
Buyer  acknowledges  that it has  read and  understood  the  provisions  of this
SECTION 14.

                                 BUYER:
                                 ------

                                 PS BUSINESS PARKS, L.P.,
                                 a California Limited Partnership

                                 By:   PS BUSINESS PARKS, INC.,
                                       a California corporation, General Partner

                                       By: /s/Ronald L. Havner, Jr.
                                          ---------------------------------
                                          Ronald L. Havner, Jr.
                                          President and Chief Executive Officer

     15. POSSESSION.  Buyer shall have and as a condition  precedent to Closing,
the right of  possession  on the Closing Date,  provided,  however,  that Seller
shall  allow  authorized  representatives  of  Buyer  reasonable  access  to the
Property for the purposes of satisfying  Buyer with respect to  satisfaction  of
any conditions precedent to the Closing contained herein.

     16.  TAX-DEFERRED  EXCHANGE.  Buyer and Seller agree that, at Seller's sole
election,  this  transaction  shall be  structured  as an exchange of  like-kind
properties  under Section 1031 of the Internal  Revenue Code of 1986, as amended
(the "Code"),  and the  regulations  and proposed  regulations  thereunder.  The
parties agree that if Seller wishes to make such  election,  it must do so prior
to the Closing Date. If Seller so elects,  Buyer shall reasonably cooperate with
Seller,  provided any such exchange is consummated pursuant to an agreement that
is  mutually  acceptable  to Buyer and Seller and which  shall be  executed  and
delivered  on or  before  the  Closing  Date.  Seller  shall  in all  events  be
responsible for all costs and expenses  related to the Section 1031 exchange and

                                       21
<PAGE>

shall fully  indemnify,  defend and hold Buyer harmless from and against any and
all liability,  claims,  damages,  expenses (including reasonable attorneys' and
paralegal  fees  and  reasonable  attorneys'  and  paralegal  fees  on  appeal),
proceedings  and causes of action of any kind or nature  whatsoever  arising out
of, connected with or in any manner related to such 1031 exchange that would not
have been  incurred by Buyer if the  transaction  were a purchase for cash.  The
provisions of the immediately  preceding  sentence shall survive closing and the
transfer of title to subject Property to Buyer.  Notwithstanding anything to the
contrary  contained in this  Section,  any such Section 1031  exchange  shall be
consummated through the use of a facilitator or intermediary so that Buyer shall
in no event be requested or required to acquire title to any property other than
the Property.

     17. MISCELLANEOUS

          (a) Notices.  Any notice  required or permitted to be given under this
Agreement shall be in writing and addressed as follows:

                    If to Seller:

                    Petula Associates, Ltd.
                    c/o Law Department
                    711 High Street
                    Des Moines, Iowa  50392-0301
                    Attn:  Dennis D. Ballard

                    With a copy to:

                    Petula Associates, Ltd.
                    c/o CRE-Equities
                    711 High Street
                    Des Moines, Iowa  50392-1370
                    Attn:  Michael S. Duffy

                    If to Buyer:

                    PS Business Parks, Inc.
                    701 Western Ave., Suite 200
                    Glendale, CA 91201
                    Attention:  Ronald L. Havner, Jr.
                    with a copy to:

                                       22
<PAGE>

                    PS Business Parks, Inc.
                    701 Western Avenue, Suite 200
                    Glendale, California 91201
                    Attention:  David Goldberg, Esq., General Counsel

                    and a courtesy copy which shall not be required for valid 
                    notice to:

                    Hale and Dorr LLP
                    1455 Pennsylvania Avenue, N.W.
                    Washington, D.C. 20004
                    Attention:  Steven S. Snider, Esq.

Unless otherwise specified herein, such notices or other communications shall be
deemed to be effective:  (i) one (1) business day after deposit with the courier
if sent by Federal Express or other recognized  overnight  delivery service;  or
(ii) upon receipt if  accomplished  by hand delivery or by confirmed  telecopied
delivery.  Either party may, from time to time, by notice in writing served upon
the other party,  in the same manner as prescribed  in this Section  designate a
different  mailing  address or a different  person to which all such notices are
thereafter to be addressed.

          (b) Brokers and Finders. Neither party has had any contact or dealings
regarding  the Property,  or any  communication  in connection  with the subject
matter of this  transaction,  through any licensed real estate  broker,  entity,
agent,  commission  salesperson,  or  other  person  who  will  claim a right to
compensation  or a commission  or finder's fee as a procuring  cause of the sale
contemplated herein,  except for Chadwick,  Saylor & Co., Inc., whose commission
shall be paid by Buyer.  In the event that any  company,  firm,  broker,  agent,
commission  salesperson or finder  perfects a claim for a commission or finder's
fee based upon any such contract,  dealings or communication,  the party through
whom the company,  firm, broker, agent,  commission  salesperson or finder makes
his claim  shall be  responsible  for said  commission  or fee and all costs and
expenses (including  reasonable  attorneys' fees) incurred by the other party in
defending against the same. No commission shall be paid or become payable unless
the Closing actually occurs. The provisions of this Subsection (b) shall survive
Closing and any termination, cancellation or recision of this Agreement.

          (c) Successors and Assigns.  This Agreement shall be binding upon, and
inure to the  benefit of, the parties  hereto and their  respective  successors,
heirs,  administrators and assigns;  provided further, however, Seller's consent
to an assignment of Buyer's rights and delegation of its  obligations  hereunder
shall not be required with respect to an  assignment of this  Agreement by Buyer
to any person or any  corporation,  general  partnership,  limited  partnership,
limited liability company or other lawful entity which is controlled by or under
common control with Buyer.

          (d) Amendments and Terminations.  Except as otherwise provided herein,
this Agreement may be amended or modified by, and only by, a written  instrument
executed by Seller and Buyer.
                                       23
<PAGE>

          (e) Governing Law. This  Agreement  shall be governed by and construed
in accordance with the laws of the State of Oregon.

          (f) Merger of Prior  Agreements.  This Agreement  supersedes all prior
agreements and understandings between the parties hereto relating to the subject
matter hereof.

          (g) Enforcement. In the event either party hereto fails to perform any
of its  obligations  under  this  Agreement  or in the  event a  dispute  arises
concerning the meaning or interpretation of any provision of this Agreement, the
defaulting  party or the party not  prevailing in such dispute,  as the case may
be,  shall pay any and all costs and  expenses  incurred  by the other  party in
enforcing or establishing its rights hereunder,  including,  without limitation,
court costs and reasonable  attorneys'  fees.  Buyer and Seller both acknowledge
each has been  advised  by  counsel as to their  respective  rights,  duties and
obligations in this Agreement and have had ample  opportunity to negotiate same.
Thus,  both Buyer and Seller  acknowledge  that any ambiguity in this  Agreement
should not necessarily be resolved against the drafter of this Agreement.

          (h) Time of the Essence. Time is of the essence of this Agreement.

          (i) Counterparts. This Agreement may be executed in counterparts, each
of which shall be deemed to be an  original,  but such  counterparts  when taken
together shall constitute but one Agreement.

          (j) Survivability.  Except as otherwise provided herein, the covenants
contained in this  Agreement  shall survive the closing of the purchase and sale
and shall not be deemed  merged in the deed,  but shall remain in full force and
effect.

          (k) No  Recordation.  Neither  Seller  nor  Buyer  shall  record  this
Agreement or memorandum  thereof in or among the land or chattel  records of any
jurisdiction.

          (l)  Proper  Execution.  The  submission  by  Seller  to Buyer of this
Agreement  in unsigned  form shall have no binding  force and effect,  shall not
constitute  an option,  and shall not confer any rights upon Buyer or impose any
obligations on Seller  irrespective of any reliance thereon,  change of position
or partial  performance  until Seller shall have executed this Agreement and the
Deposit  shall have been  received  by the Title  Company.  Notwithstanding  the
foregoing  sentence,  Seller's  submission to Buyer of this  Agreement  shall be
deemed withdrawn,  revoked and incapable of being executed by Buyer in the event
Buyer has not returned a duly executed original Agreement to Seller on or before
5:00 p.m. (EST) on April 30, 1998.

          (m) Personal  Liability.  There shall be no personal liability imposed
on the individuals who have executed this Agreement (or the attached exhibits)
  
                                     24
<PAGE>

          (n)  Survival  of   Representations.   Except  as  expressly  provided
otherwise in this  Agreement,  all  representations  and warranties  made by the
parties herein or in any instrument or document furnished in connection herewith
(except  warranties of title in the  conveyance  documents)  shall survive for a
period of one (1) year from the date of Closing and any action  thereon  must be
commenced  within such period or they are deemed waived and released;  provided,
however,  Representation  9(a)(iii)  regarding  leases  shall  survive  for  the
remaining term of any lease (excluding renewals) for which Buyer did not receive
a tenant estoppel executed prior to Closing;  however, to the extent that tenant
estoppels are obtained post closing,  the survival  period for such leases shall
be one (1) year from the date of Closing.

          (o) Dates.  Whenever used herein, unless expressly provided otherwise,
the term  "days"  shall  mean  consecutive  calendar  days,  except  that if the
expiration  of any time period  measured  in days occurs on a Saturday,  Sunday,
legal holiday or other day when federal offices are closed in Washington,  D.C.,
such expiration shall automatically be extended to the next business day.

          (p) Prior to the Closing,  information received in connection with the
Property shall be kept strictly  confidential  and shall not,  without the prior
consent of the other  party,  be  disclosed  by such other party or used for any
purpose  other than  evaluating  the Property  except in the event of litigation
between the parties hereto,  Buyer and Seller agree that such information  shall
only be  transmitted  to Buyer's and Seller's  respective  officers,  directors,
trustees, employees, attorneys, accountants,  contractors, consultants, advisors
and agents who need to know such  information  for  purposes of  evaluating  the
Property and transactions  contemplated under this Agreement.  The provisions of
this  Section  17(p)  shall  not apply to any  information  which is a matter of
public  record or  obtainable  from other  sources and shall not prevent  either
Buyer or Seller from complying with laws,  rules,  regulations and court orders,
including,  without limitation,  governmental  regulatory,  disclosure,  tax and
reporting requirements.

          (q)  Liability of Sellers.  Any  liability of Seller for damages for a
breach of any representations, warranties or covenants in the Agreement shall be
joint and several liability.

     18.  ESCROW AGENT.  Escrow Agent shall hold the Deposit in accordance  with
the terms and provisions of this Agreement, subject to the following:

          (a)  Escrow  Agent  undertakes  to  perform  only  such  duties as are
expressly set forth in this Agreement and no implied duties or obligations shall
be read into this Agreement against Escrow Agent.

          (b) Escrow Agent may act in reliance upon any writing or instrument or
signature  which it, in good  faith,  believes  of any  statement  or  assertion
contained  in such  writing  or  instrument,  and may  assume  that  any  person
purporting to give any writing,  notice, advice or instrument in connection with
the provisions of this Agreement has been duly authorized to do so. Escrow Agent
shall not be liable in any manner for the sufficiency or correctness as to form,

                                       25
<PAGE>

manner and execution,  or validity of any instrument deposited in escrow, nor as
to the  identity,  authority,  or right of any person  executing  the same,  and
Escrow Agent's duties under this Agreement shall be limited to those provided in
this Agreement.

          (c)  Unless  Escrow  Agent  discharges  any of its  duties  under this
Agreement in a negligent  manner or is guilty of willful  misconduct with regard
to its duties  under this  Agreement,  Seller and buyer shall  indemnify  Escrow
Agent  and  hold it  harmless  from  any and all  claims,  liabilities,  losses,
actions,  suits or proceedings at law or in equity, or other expenses,  fees, or
charges of any  character or nature,  which it may incur or with which it may be
threatened by reason if its acting as Escrow Agent under this Agreement;  and in
such connection  Seller and Buyer shall  indemnify  Escrow Agent against any and
all expenses including reasonable  attorneys' fees and the cost of defending any
action, suit or proceeding or resisting any claim in such capacity.

          (d) If the parties  (including  Escrow Agent) shall be in disagreement
about the interpretation of this Agreement, or about their respective rights and
obligations, or the propriety of any action contemplated by Escrow Agent, Escrow
Agent may,  but shall not be  required  to,  file an action in  interpleader  to
resolve the  disagreement.  Escrow Agent shall be indemnified  for all costs and
reasonable  attorneys'  fees in its capacity as Escrow Agent in connection  with
any such  interpleader  action and shall be fully protected in suspending all or
part of its  activities  under  this  Agreement  until a final  judgment  in the
interpleader action is received.

          (e) Escrow  Agent may consult  with counsel of its own choice and have
full and complete authorization and protection in accordance with the opinion of
such  counsel.  Escrow Agent shall  otherwise  not be liable for any mistakes of
fact or errors of judgment,  or for any acts or  omissions  of any kind,  unless
caused by its negligence or willful misconduct.

          (f) The  Escrow  Agent  may in its sole  discretion  resign  by giving
thirty (30) days' written notice thereof to the Buyer and Seller.  The Buyer and
Seller shall furnish to the Escrow Agent written instructions for the release of
the escrow funds and escrow  documents in such event.  If the Escrow Agent shall
not have received such written  instructions,  the Escrow Agent may petition any
court of competent jurisdiction for the appointment of a successor Escrow Agent,
and upon such appointment  deliver the escrow funds and escrow documents to such
successor.

     19. SELLER'S ADDITIONAL  AGREEMENTS RELATED TO PROPERTIES WITH IMPROVEMENTS
UNDER CONSTRUCTION. (Intentionally Deleted)

                                       26

<PAGE>

     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first above written.

                                  SELLER:

                                  PETULA ASSOCIATES., LTD.,
                                  an Iowa corporation

                                  By:  /s/ M.S. Duffy
                                     -------------------------
                                            M.S. Duffy
                                  Its: Vice President


                                  By:  /s/ D.D. Ballard
                                     -------------------------
                                            D.D. Ballard
                                  Its: Counsel


                                  EQUITY FC, LTD., an Iowa Corporation
                                  By:  /s/ Thomas J. Bell
                                     -------------------------
                                           Thomas J. Bell
                                  Its: Vice President


                                  By:  /s/ Clint Woods
                                     -------------------------
                                           Clint Woods
                                  Its: Counsel

                                  BUYER:

                                  PS BUSINESS PARKS, L.P.,
                                  a California Limited Partnership

                                  By:  PS BUSINESS PARKS, INC.,
                                       a California corporation, General Partner

                                       By:/s/ Ronald L. Havner, Jr.
                                          ------------------------------
                                          Ronald L. Havner, Jr.
                                          President and Chief Executive Officer

                                          Buyer's Social Security Number or Tax
                                          Identification Number:95-4609260



                                       27

                                                                    Exhibit 10.2
                     REAL ESTATE PURCHASE AND SALE AGREEMENT


                                 by and between

                     PRINCIPAL MUTUAL LIFE INSURANCE COMPANY
                           AND PETULA ASSOCIATES, LTD.
                                     SELLER



                                       and



                             PS BUSINESS PARKS, L.P.
                                      BUYER










    Exhibits to this Agreement have been omitted and will be furnished to the
                Securities and Exchange Commission upon Request







<PAGE>

                                    INDEX TO

                     REAL ESTATE PURCHASE AND SALE AGREEMENT





1. Property Included in Sale...............................................1


2. Purchase Price/Remedies.................................................2


3. Title to the Property...................................................2


4. Seller's Pre-Closing Deliveries.........................................3


5. Buyer's Due Diligence...................................................3


6. Buyer's Conditions to Closing...........................................4


7. Seller's Conditions to Closing..........................................5


8. The Closing.............................................................5


9. Representations and Warranties..........................................9


10. Responsibility for Violations..........................................13


11. Maintenance of Insurance...............................................13


12. Casualty or Condemnation...............................................13


13. Indemnification........................................................14


14. Condition of Property..................................................14


15. Possession.............................................................15
 

                                      2
<PAGE>

16. Tax-Deferred Exchange..................................................15


17. Miscellaneous..........................................................15


18. Escrow Agent...........................................................18

 



                                      3
<PAGE>

                     REAL ESTATE PURCHASE AND SALE AGREEMENT


    THIS REAL ESTATE PURCHASE AND SALE AGREEMENT (the "Agreement") is made as
of the 30 day of April, 1998 (the "Agreement Date") which shall be the later
to occur of  execution  of this  Agreement  by Buyer or  Seller  by and  between
PRINCIPAL  MUTUAL  LIFE  INSURANCE  COMPANY   ("Principal   Mutual"),   an  Iowa
corporation, and PETULA ASSOCIATES, LTD. ("Petula"), an Iowa corporation, herein
collectively  referred to as "Seller",  and PS BUSINESS  PARKS,  L.P.  (formerly
known  as  AMERICAN  OFFICE  PARK  PROPERTIES,   L.P.),  a  California   limited
partnership, herein referred to as "Buyer."

                                R E C I T A L S:

     WHEREAS,  each  Seller  desires to sell its  undivided  interest in certain
improved  real  property  along with certain  related  personal  and  intangible
property,  and Buyer  desires to purchase  said real,  personal  and  intangible
property on the terms and conditions set forth herein;

            NOW,  THEREFORE,  in  consideration  of the foregoing and the mutual
undertakings  set forth  herein,  and for good and valuable  consideration,  the
receipt and  sufficiency of which is hereby  acknowledged,  the Buyer and Seller
hereby agree as follows:

     1.  PROPERTY  INCLUDED IN SALE.  Seller hereby agrees to sell and convey to
Buyer,  and Buyer hereby agrees to purchase  from Seller,  at the price and upon
the terms and conditions set forth in this Agreement, the following:

          (a) that certain real property more particularly  described in Exhibit
A attached hereto (the "Real Property");

          (b) all right, title and interest of Seller in all rights, privileges,
alleys,  strips and gores,  rights of way and easements  appurtenant to the Real
Property,  including,  without  limitation,  all  minerals,  oil,  gas and other
hydrocarbon  substances as well as all development  rights,  air rights,  water,
water rights (and water  stock,  if any)  relating to the Real  Property and any
easements,  rights-of-way  or other  appurtenances  used in connection  with the
beneficial use and enjoyment of the Real Property;

          (c) all  improvements  and  fixtures  located  on the  Real  Property,
including all buildings and  structures  presently  located on the Real Property
listed on  Schedule A, as more  particularly  described  in Exhibit A,  attached
hereto,  and all related  facilities,  amenities,  all apparatus,  equipment and
appliances  used in  connection  with the  operation  or  occupancy  of the Real
Property,  such as heating and air  conditioning  systems and facilities used to
provide any utility  services,  refrigeration,  ventilation,  garbage  disposal,
recreation or other services on the Real Property (all of which are collectively
referred to as the "Improvements");

          (d) all tangible or intangible  personal  property owned by Seller and
used  in  the  ownership,   use  or  operation  of  the  Real  Property   and/or
Improvements, including, without limitation, the right to use any trade name now
used in  connection  with the Real Property (the  "Personal  Property")  and any
contract or lease rights, agreements, utility contracts or other rights relating
to the ownership, use and operation of the Real Property.

          (e) all of Seller's interest as lessor in all leases covering the Real
Property and Improvements,  including all tenant security and other deposits and
interest earned thereon and prepaid rent and interest  earned thereon.  Interest
on deposits and prepaid rents shall only be  transferred  to Buyer if applicable
state  law or  the  applicable  lease  requires  that  such  funds  be  held  in
interest-bearing accounts.

          All of the items referred to in Subsections (a), (b), (c), (d) and (e)
above are hereinafter collectively referred to as the "Property."


<PAGE>

     2. PURCHASE PRICE/REMEDIES

          (a) The total purchase  price (the "Purchase  Price") for the Property
is Thirty-four Million Six Thousand Eight Hundred Twenty-four and 91/100 Dollars
($34,006,824.91)  allocated as follows:  Principal Mutual  ($11,334,219.93)  and
Petula  ($22,672,604.98).  The  Purchase  Price is payable by wire  transfer  of
immediately  available funds in U.S.  dollars via the federal bank wire transfer
system to Chicago  Title  Insurance  Company,  San  Francisco,  CA,  (the "Title
Company") at Closing.

          (b) (Intentionally Deleted)

          (c) (Intentionally Deleted)

          (d) (Intentionally Deleted)

          (e) (Intentionally Deleted)

          (f) (Intentionally Deleted)

     3. TITLE TO THE PROPERTY

          (a) At the  Closing,  Seller  shall  convey to Buyer  and Buyer  shall
accept title to the Property in fee simple in accordance  with the terms of this
Agreement, and Buyer's obligation to accept said title shall be conditioned upon
Buyer then being conveyed good and clear record,  marketable and insurable title
(in fee  simple to the Real  Property,  all  rights,  privileges  and  easements
appurtenant thereto, and to the Improvements,  by duly executed and acknowledged
special  warranty deed - statutory  form.  It shall be a condition  precedent to
Buyer's  obligation to close  hereunder  that the Title Company  stands ready to
issue,  at the Closing an ALTA standard  full  coverage  form Owner's  Policy of
Title Insurance with extended coverage and all endorsements reasonably requested
by Buyer, insuring Buyer's interest in the Property,  dated the date of Closing,
with  liability  in the  amount  of the  Purchase  Price,  subject  only  to the
Permitted Exceptions (the "Title Policy"). The Title Policy shall insure against
all  mechanics'  liens  and  shall  have full  survey  coverage  and shall be an
extended coverage policy insuring against, among other things, mechanics' liens,
easements  and claims of parties in possession  not shown by the public  records
with all general and standard exceptions  deleted.  Seller shall pay the cost of
the standard owner's policy.  Buyer shall bear the expense for extended coverage
and the cost of any endorsements requested by Buyer.

          (b) Buyer  shall,  prior to the  Approval  Date,  provide  Seller with
Buyer's  objections to any matters disclosed by the Commitment,  Title Documents
or Survey.  All matters shown on the Title  Exceptions which are not objected to
by Buyer prior to the  Approval  Date shall be  "Permitted  Exceptions".  Seller
agrees  to use its best  efforts  to  satisfy  such  objections  noted by Buyer,
provided that:  (i) Seller shall obtain a satisfaction  and release or bond over
any monetary liens,  in a manner  reasonably  satisfactory to Buyer,  including,
without limitation,  any and all mortgages,  mechanics' liens and judgment liens
(collectively,  "Monetary  Liens");  and (ii) Seller  shall not be  obligated to
litigate or spend more than  $10,000.00  in the  aggregate to cure  non-monetary
lien objections or to seek any cure which cannot be obtained within fifteen (15)
days.  Seller shall notify  Buyer of Seller's  proposed  actions to satisfy such
objections, and shall have up to the Closing Date to satisfy such objections and
the Closing  Date shall be extended a reasonable  period of time,  not to exceed
fifteen (15) days, if necessary to allow such cure period.  If, despite its best
efforts to do so, Seller cannot satisfy such objections (other than the Monetary
Liens,  which  shall be  satisfied  or bonded  over by  Seller) on or before the
expiration  of such  additional  fifteen  (15) day period,  Buyer shall have the
option to waive its  objection(s)  to such  title  and/or  other  defect(s)  and
proceed to Closing or terminate this  transaction.  Buyer  acknowledges that the
termination of the  transaction  pursuant to this section of the Agreement shall
not entitle Buyer to receive  reimbursement  for third party expenses or to seek
specific performance or any other legal or equitable remedy against Seller.

                                       2
<PAGE>

4.   SELLER'S PRE-CLOSING DELIVERIES

          Buyer  acknowledges  that prior to execution of this Agreement  Seller
has  delivered  the items listed in Schedule B for Buyer's  review and approval.
Seller shall be under no further obligation to deliver additional items to Buyer
unless Buyer requests such items prior to the Approval Date and such  additional
items are reasonably  necessary to complete Buyer's due diligence.  Seller shall
only be obligated to provide such  additional  items if: (i) the items requested
are in Seller's or Seller's  property  manager's  actual  possession or control;
(ii) the items are not  privileged;  and (iii) Buyer has identified the specific
property for which the item is requested.

     5. BUYER'S DUE  DILIGENCE.  Buyer shall be allowed to conduct the following
due diligence prior to purchasing the Property:

          (a) Review and approve title to the Property as shown on a preliminary
title report (the "Title Report") from the Title Company.

          (b) Review and approve the  operating  statements  of the Property for
the previous two (2) calendar years as well as the current calendar year-to-date
and audited  financial  statements for 1997,  provided same are available and in
Seller's actual possession.

          (c) Review and approve true, correct and complete copies of all tenant
leases  relating to the Property and a certified rent roll of even date herewith
in the form attached hereto as Exhibit B, (the "Certified Rent Roll").

          (d) Review and approve copies of any site plans and building  drawings
and  specifications  and  existing   environmental   reports  currently  in  the
possession or control of the Seller.

          (e)  Review  and  approve  copies  of  any   maintenance  and  service
agreements currently in force.

          (f) Review and approve an as-built  survey showing the location of all
improvements and recorded easements on the Property.

          (g) Performance of a feasibility study of the Property, including, but
not  limited  to,  review  and  approval  of  the  physical  and   environmental
characteristics  and condition of the Property and  performance of marketing and
feasibility  studies,  structural and  engineering  investigations,  auditing of
books and  records of the  Property,  financial  analyses  and  verification  of
existing   zoning.   Seller   agrees  to  provide   Buyer  and  its  agents  and
representatives  reasonable  access to the Property  and to all books,  records,
files,  financial  data,  leases and  contracts  relating to the Property and to
reasonably  cooperate in such  examinations and to cause the property manager to
reasonably  cooperate in such examinations  following the Agreement Date for the
purpose of performing,  at Buyer's sole cost and expense,  the  above-referenced
studies,  physical  inspections,  investigations  and tests on the Property (the
"Tests") provided that no such tests shall be conducted without at least two (2)
business days prior written  notice to Seller and if any such tests are invasive
Seller's prior approval of such Tests,  which approval shall be in Seller's sole
and absolute discretion.  Notwithstanding anything herein to the contrary, Buyer
shall  not need  Seller's  further  consent  to  conduct  Phase I  environmental
studies. Buyer's access is further conditioned on Buyer complying with the terms
of the Access and Indemnification  Agreement attached hereto as Exhibit E. Buyer
shall be  required  to  conduct  such  Tests in a manner  as to not  disturb  or
interfere  with the  current use of the  Property  and upon  completion  of such
Tests, Buyer agrees at its sole cost to restore the Property to the condition it
was in immediately prior to such Tests, including, but not limited to the prompt
 
                                      3
<PAGE>

removal of anything placed on the Property in connection with such Tests. Copies
of any third party reports,  letters or other written information generated as a
result of such Tests  shall be provided  to Seller if the sale  contemplated  by
this Agreement does not close for any reason other than Seller's default.  Buyer
shall  indemnify,  defend  (with  counsel  reasonably  satisfactory  to Seller),
protect, and hold Seller harmless from and against any and all liability,  loss,
cost, damage, or expense (including,  without limitation,  reasonable attorney's
fees and costs) which Seller may sustain or incur by reason of or in  connection
with any Tests made by Buyer or Buyer's agents or contractors  relating to or in
connection  with the Property,  or entries by Buyer or its agents or contractors
onto  the  Property.  Notwithstanding  any  provision  to the  contrary  in this
Agreement, the indemnity obligations of Buyer under this Agreement shall survive
any  termination  of this Agreement or the delivery of the deed and the transfer
of title pursuant to this Agreement.

               The items  referred to above in  Subsections  5(a)-(g)  and those
listed on Schedule B shall be  collectively  referred  to as the "Due  Diligence
Items." Buyer acknowledges that Seller has provided Buyer with the Due Diligence
Items prior to execution of this Agreement.

               The date this  Agreement is executed by both parties shall be the
"Approval Date" and upon such execution there shall be a conclusive  presumption
that  Buyer  has  approved  the  Due  Diligence   Items  and  the  physical  and
environmental  condition of the Property.  Notwithstanding the foregoing,  Buyer
shall be entitled to rely upon the  representations and warranties of Seller set
forth in this Agreement.

     6. BUYER'S CONDITIONS TO CLOSING.  The following  conditions are conditions
precedent to Buyer's obligation to purchase the Property:

          (a)  Seller  shall  conduct  business  at the  Property  in a good and
diligent manner  consistent with Seller's current  business  practices and shall
maintain  the  Property  in its present  condition  through the date of Closing,
reasonable wear and tear excepted.

          (b) Seller has  terminated,  at Seller's  sole cost and  expense,  all
Service/Equipment  Contracts except to the extent Buyer has given Seller written
notice that certain  Service/Equipment  contracts  should be continued and Buyer
has assumed post Closing  liability for such contracts,  however,  such services
shall be continued at Seller's expense until the Closing Date.

          (c) The Title  Company  shall stand ready to issue the Title Policy in
the form required herein.

          (d) Delivery by Seller at Closing of the Closing  Documents  described
in Section 8 hereof.

          (e)  Performance  by Seller as and when required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Seller  pursuant to this  Agreement and all of Seller's  representations  and
warranties  contained in this  Agreement  shall be true and correct on and as of
the Closing Date as if made anew on that date.

          (f)  Delivery by Seller of Tenant  Estoppel  Certificates  in the form
attached  hereto as  Exhibit F for  tenants  comprising  at least 80% of the net
rentable  square feet of the Property  which shall include all tenants listed on
Exhibit F-1, the  substance  and content of which shall be  consistent  with the
Certified  Rent Roll and Seller  shall use  commercially  reasonable  efforts to
obtain the required  Tenant  Estoppel  Certificates.  Buyer shall cooperate with
Seller post Closing to complete  collection  of Tenant  Estoppels.  In the event
sufficient  Tenant  Estoppels  cannot be  obtained,  Buyer shall accept a Seller
Estoppel in the form attached  hereto as Exhibit F-2 and all post Closing Tenant
Estoppels shall be delivered  pursuant to the terms of Exhibit F-2. In the event
that the  conditions  set forth above in this Section 6 are not  satisfied  (and
Buyer is not  otherwise  in  default  of this  Agreement),  Buyer  may  elect to
terminate this Agreement or waive satisfaction of the condition and close escrow
in either instance by giving written notice to Seller.

          (g) Seller has hired legal counsel and consultants to review a pending
application by Sequent  Computer Company to change the existing traffic patterns
at the Property and filed  objections  to the plan on the  condition  that Buyer
reimburse Seller for the cost of such objections,  including, but not limited to
the cost of any consultants  hired and reasonable  attorney fees. The objections
have been overruled and the Seller has filed an appeal of even date herewith.

                                       4
<PAGE>

     7. SELLER'S CONDITIONS TO CLOSING.  The following conditions are conditions
precedent to Seller's obligation to sell the Property:

          (a)  Delivery  by Buyer  at  Closing  of the  Purchase  Price  and the
executed  Assignment  and  Assumption of Leases in the form  attached  hereto as
Exhibit G.

          (b)  Performance  by Buyer as and when  required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Buyer pursuant to this Agreement.

               In the  event  that  the  conditions  in this  Section  7 are not
satisfied, Seller may elect, at its sole discretion, to terminate this Agreement
or waive satisfaction of the condition and close escrow.

     8. THE CLOSING

          (a) The Closing  hereunder  shall be held and delivery of all items to
be made at the Closing  under the terms of this  Agreement  shall be made at the
offices of the Title Company on April 30, 1998, or such other date prior thereto
as Buyer and Seller may mutually  agree in writing (the  "Closing  Date").  Such
date may not be extended  without the prior written  approval of both Seller and
Buyer.  In the event the Closing  does not occur on or before the Closing  Date,
the Title Company  shall,  subject to the provisions of Section 2, and unless it
is  notified  by both  parties to the  contrary,  within five (5) days after the
Closing  Date,  return  to the  depositor  thereof  items  which  may have  been
deposited  pursuant  to this  Agreement.  Any such  return  shall not,  however,
relieve  either  party  hereto  of any  liability  it may have for its  wrongful
failure to close. The delivery to the Escrow Agent of the Closing Documents, as


                                       5
<PAGE>


hereinafter  defined,  by both parties and the Purchase  Price by Buyer shall be
deemed sufficient to effect a closing under Section 8(a).

          (b) At or before  the  Closing,  Seller  shall  deliver  to escrow the
following (collectively, the "Closing Documents"):

               (i) special warranty deed - statutory form conveying to the Buyer
the  Property  as  required  by Section 3 above in the form  attached  hereto as
Exhibit I;

               (ii) originals or, if Seller does not have  originals,  certified
true, complete and correct copies of all leases (and amendments thereto, if any)
in Seller's actual and physical possession covering any portion of the Property,
any  security  deposits  relating  thereto,   and  an  executed  Assignment  and
Assumption of Lease in the form attached hereto as Exhibit G;

               (iii) a Bill of Sale, in the form attached hereto as Exhibit J;

               (iv) a  certificate  by  Seller  to the  effect  that  all of the
representations,  warranties  and covenants set forth in this  Agreement  remain
true, correct and complete as of the Closing Date;

               (v) a Certified Rent Roll in the form attached  hereto as Exhibit
B, dated as of the date of Closing Date  consistent  with prior  Certified  Rent
Rolls and Tenant Estoppel Certificates;

               (vi)  such  title   affidavits  or  other  documents  as  may  be
reasonably required by the Title Company with copies thereof to the Buyer;

               (vii) all rent records and related documents in the possession or
under the  control of Seller.  Such  records  may include a schedule of all cash
deposits  and a check  or  credit  to  Buyer  in the  amount  of such  deposits,
including any interest  thereon (to the extent that applicable  state law or the
applicable lease requires payment of interest on such amounts) held by Seller at
the Closing under the Lease. To the extent any deposits are in a form other than
cash, such deposits shall be transferred to Buyer at Closing without recourse.

               (viii) To the extent in Seller's possession or control, originals
or copies of all current site plans, surveys,  architectural drawings, plans and
specifications,  engineering  plans and  studies,  floor  plans,  soil  reports,
environmental  studies,  and  landscape  plans.  To the extent such items are in
Seller's  possession  or control,  Seller shall also deliver (i)  originals  (or
copies,  if originals are not then  available) of all then effective  assignable
guaranties,  warranties and/or payments and performance bonds made by any person
for the benefit of Seller with respect to the Property of any of its components,
together with an instrument  assigning  such  guaranties and warranties to Buyer
and (ii)  originals  (or copies,  if originals  are not then  available)  of all
certificates,  Licenses, permits authorizations and approvals issued for or with
respect to the  Property  by  governmental  and  quasi-governmental  authorities
having  jurisdiction,  to the extent  such items are in Seller's  possession  or
control.

               (ix) to the extent available,  originals (or copies, if originals
are not  available)  of all  documents  and books and records  necessary for the
continued operation of the Project,  including without  limitation,  rent rolls,
lease files,  rent records,  escalation  records and statements and  maintenance
records;

               (x) an original resolution of Seller authorizing the execution of
this Agreement,  the conveyance documents and all other documents to be executed
by Seller and the performance by Seller hereunder;

               (xi) Seller's  Non-Foreign  Certification in the form attached as
Exhibit C; and

               (xii) notices to the tenants at the Property in the form attached
as Exhibit D,  executed by Seller  informing  them of the change in ownership of
the Property.

                                       6
<PAGE>

               (xiii) an  executed  Assignment  of  Warranties,  Guaranties  and
Service Contracts in the form attached as Exhibit O.

               Buyer may waive  compliance  on  Seller's  part  under any of the
foregoing items by an instrument in writing.

          (c) At or before  the  Closing,  Buyer  shall  deliver  to escrow  the
Purchase  Price,  as adjusted for  prorations,  and an executed  Assignment  and
Assumption of Leases in the form attached hereto as Exhibit G.

          (d) Seller and Buyer shall each deposit such other  instruments as are
reasonably  required by the escrow holder to close the escrow and consummate the
purchase of the Property in accordance with the terms hereof.

          (e) The following items shall be prorated separately for each property
identified on Schedule A as of 11:59 p.m. on the date immediately  preceding the
Closing Date and the net amount  thereof shall be added to or deducted  from, as
the case may be, the amount of the Purchase Price to be paid at the Closing:

               (i) general real estate,  personal  property and ad valorem taxes
and assessments  for the current tax year of the Property.  If any such taxes or
assessments  are  payable in  installments,  all  installments  due  through the
Closing  together with the accrued but unpaid portion of any other  installments
not yet due as of the Closing shall be paid for by the Seller;

               (ii) taxes,  water,  sewer and front foot  benefit  charges,  and
charges for electricity, gas, telephone and other utilities and license fees;

               (iii)  rent and other  charges  under the  Leases  (to the extent
monies have actually been collected therefor), including any free rent under any
of the  Leases;  Buyer  shall  receive a credit at Closing  for any free rent or
other tenant concessions due under any Lease subsequent to Closing;

               (iv) all other income and expenses relating to the Property;

               (v) any other items that are customarily prorated in transactions
of this nature; and

               (vi) any and all cash  security  deposits,  prepaid  rent and all
interest  earned  thereon  (to the extent  interest  is payable to tenant  under
applicable  state  law or the  applicable  lease)  shall be a credit to Buyer at
Closing.  Seller shall be fully  liable for any wages and other  amounts due and
owing  any  employees  at the  Property  which  have  accrued  up to the date of
Closing.  Seller shall retain and Buyer shall not be entitled to any credit for,
the  deposits,  if any,  made by  Seller in  connection  with the  provision  of
electric, sewer, water, telephone and other utility services to the Property.

     For  purposes  of  calculating  prorations,  Buyer shall be deemed to be in
title to the  Property,  and,  therefore,  entitled to the income  therefrom and
responsible  for the expenses  thereof for the entire day upon which the Closing
occurs.  All such prorations  shall be made on the basis of the actual number of
days of the month  which  shall have  elapsed as of the date of the  Closing and
based upon the actual number of days in the month and a three hundred sixty-five
(365) day year. The amount of such  prorations  shall  initially be performed by
Seller and  mutually  agreed to by the parties  prior to  Closing,  but shall be
subject to  adjustment  in cash after the Closing  outside of escrow as and when
complete and accurate information becomes available,  if such information is not
available at the Closing. Seller and Buyer agree to cooperate and use their best
efforts to make such adjustments no later than sixty (60) days after the Closing
(except with  respect to property  taxes,  which shall be adjusted  within sixty
(60) days after the tax bills for the applicable period are received).

                                       7
<PAGE>

     Buyer shall,  post Closing  based on April 30, 1998  receivables,  purchase
accounts receivable relating to the Property from Seller at a price equal to the
following percentage of such outstanding accounts receivable:

      100% of the amount of accounts receivable less than 31 days old; and
            0% of the amount of accounts receivable over 30 days old;

     The term  "Rent"  as used  herein  shall  mean  all  rents,  including  any
percentage rent and any accrued tax and operating  expense  escalation,  charges
and other revenue of any kind generated  from or in connection  with the Leases.
Except as set forth in this Section  8(e)(vii),  all items of income and expense
which  accrue for the period  prior to the  Closing  will be for the  account of
Seller and all items of income and  expense  which  accrue for the period on and
after the Closing will be for the account of Buyer. Buyer shall receive a credit
against the  Purchase  Price for all amounts of Rent which are  allocable to the
period on and after the Closing and which have  accrued as of the Closing  Date,
including  those Rents which have accrued but remain  uncollected as of the date
of Closing. The provisions of this Section 8(e)(viii) shall survive the Closing.

               (viii)  With  respect  to  expenses  of the  Property  which  are
chargeable  to the tenants  pursuant to the  provisions  of the Leases (the "CAM
Charges"),  Seller  shall  determine  (1) the amount of those  expenses  paid or
payable by Seller from January 1 in the year in which the Closing occurs through
the date of Closing or, with regard to taxes and assessments,  the amount of the
proration  thereof  charged to Seller and (2) the  amount  tenants  have paid to
Seller  from  January 1 in the year in which  Closing  occurs  until the date of
Closing as the  tenants'  pro rata share of such  tenant  expenses.  If accurate
allocations of CAM Charges, accounts receivable, or any other expenses cannot be
made at Closing  because  current  bills are not  obtainable,  the parties shall
allocate  such  expenses  at  Closing on the best and most  current  information
available,  subject to adjustment in cash as soon as reasonably  possible  after
the Closing when final bills or other  evidence of the  applicable  expenses are
received,  but such adjustment  shall be made no later than six (6) months after
the Closing  Date.  Buyer shall also be entitled to a credit at Closing equal to
any CAM  Charges  for 1997 and prior years which are owing to any of the tenants
of the  Property.  The  provisions of this Section  8(e)(vii)  shall survive the
Closing.

               (ix) Those items described in the Settlement  Statement  executed
by the parties hereto of even date herewith.

          (f) The costs  incurred  in this  transaction  shall be  allocated  as
follows:

               (i) Seller shall pay standard  rates for the Title Policy.  Buyer
shall pay for any title endorsements and extended coverage. Seller shall pay all
transfer taxes associated with the sale.

               (ii) Buyer shall pay the cost of recording fees applicable to the
sale.

               (iii) Buyer shall pay the cost of the updated survey.

               (iv) Each party shall pay its own legal fees and expenses and 50%
of all escrow charges.

               (v) Seller shall pay all costs  associated  with the Tax Deferred
Exchange (as described in Section 16 hereof).

               (vi) Seller shall pay for local improvement district assessments,
farm or timber real property tax deferrals, if any.

          (g) As additional  consideration  for Buyer's  purchasing the Property
and paying the Purchase Price to the Seller,  Seller hereby covenants and agrees
to  remain  fully  liable  for  the   performance  and  payment  of  all  tenant
improvements and the payment of all leasing commissions  currently due and owing
(including  any  delinquent  amounts)  under  any of the  Leases  and  under any
leasing/commission  agreement  up to the Closing  Date except for amounts  which
                                       8
<PAGE>

shall  hereafter  be due  and  owing  under  any  of the  Leases  or  under  any
leasing/commission agreement, including, without limitation, leasing commissions
with  respect to any option to renew or extend the Leases,  (it being  expressly
understood  and agreed that Buyer is assuming the  obligations to perform or pay
for any tenant improvements,  and to pay for any leasing commissions which shall
hereafter be owing under any renewals or  extensions  of the Leases or under any
leasing/commission agreement before or after the Closing Date which are approved
by Buyer).

          (h) Each party hereto shall indemnify, defend and hold the other party
(together with its officers, directors, and employees) harmless from and against
all claims, demands, causes of actions,  judgments,  damages, costs and expenses
(including,  without limitation,  reasonable,  actual attorneys' fees and courts
costs),  deficiencies,  settlements and investigations  which relate to matters,
actions or omissions  which arise out of or are based upon any of the  following
during such parties'  period of ownership,  which for Seller shall be the period
of time prior to Closing  and for Buyer  shall be the period of time on or after
Closing:

               (i) any obligation  under any contracts,  agreements and writings
entered into by or on behalf of such party in respect of the use,  construction,
operation,  ownership,  occupancy or  maintenance of any portion of the Property
arising out of an event occurring during such parties' period of ownership;

               (ii) any accident,  injury,  death or damage whatsoever caused to
any person or entity or loss of property,  occurring in or about the Property or
any part thereof,  or on any other property  connected with or adjacent  thereto
during such parties' period of ownership; or

               (iii) any breach of the  covenant set forth in Section  8(g),  or
with respect to any payment or  performance  obligation  under any of the Leases
for tenant  improvements  or under any of the Leases  and/or  leasing/commission
agreements for leasing commissions which have heretofore accrued,  which are now
due and owing or which shall hereafter accrue, as described in Section 8(g).

               (iv) any breach of a representation or warranty set forth in this
Agreement.

               (v)  Notwithstanding  the above but subject to the limitations on
Seller's  indemnity set forth in section 8(g),  Seller shall not be  indemnified
for any  leasing  commissions  which are payable  subsequent  to the Closing and
relate  to  leases  in  force  on  the  date  hereof,  including  those  leasing
commissions  listed on Schedule C, and Buyer shall not be obligated to indemnify
Seller for  Service/Equipment  Contracts (as hereinafter  defined) which are not
assumed by the Buyer at Closing.

     9.  REPRESENTATIONS AND WARRANTIES.  "To the best of Seller's knowledge" or
other   references   herein  to  Seller's   knowledge   means  the  actual  (not
constructive)  knowledge  which  Mike  Duffy and Doug  Kintzle  have  based upon
reasonable  familiarity with the property records and continued involvement with
the Property.  Notwithstanding the foregoing,  the term "to the best of Seller's
knowledge"  shall not be construed to imply any covenant  that such  individuals
have  conducted  any  review of files or other  inquiry in  connection  with the
transaction   contemplated  by  this  Agreement.   Furthermore,   the  foregoing
individuals  are acting in the  capacity  as agents or  employees  of Seller and
shall have no personal liability with respect to any representations, warranties
or covenants of Seller in this Agreement.

          (a) Seller  hereby  represents  and  warrants  to Buyer as of the date
hereof and as of the date of Closing as follows:

               (i) Seller is a corporation  duly organized and validly  existing
under  the laws of the State of Iowa and is in good  standing  under the laws of
the State of Oregon.

               (ii) Ownership.
                                       9
<PAGE>


                    (A)  Seller is the owner of the  Property  of record  and in
fact, legally and beneficially,  and to the best of Seller's  knowledge,  Seller
has good, marketable and insurable title to the Property.

                    (B) No person or  entity  other  than  Seller  and  Seller's
affiliates  has any interest in the legal or  beneficial  title to the Property;
there are no options to  purchase  the  Property  which are  effective,  nor has
Seller  previously  entered into any other  contract of sale or agreement of any
kind with a party other than Buyer which is presently  effective  and which will
not be  terminated  before  the date of this  Agreement.  After the date  hereof
Seller will not enter into any agreement or contract or negotiate with any party
other  than  Buyer  with  respect  to the sale of the  Property,  nor enter into
financial  arrangements of any kind with respect to the Property nor will Seller
pledge or assign any right,  title,  interest in or to the  Property or any part
thereof to any person or entity.

               (iii) Leases.

                    (A) As of the date of the  Agreement  there  are no  leases,
subleases,  licenses or other rental agreements or occupancy agreements (written
or verbal) which grant any  possessory  interest in and to any space situated on
or in any of the  Property or that  otherwise  give rights with regard to use of
any  portions  of any of the  Property  other than the Leases  described  in the
Certified  Rent Roll,  as set forth in Exhibit B attached  hereto (said  leases,
together with any and all amendments,  modifications and supplements thereto and
guarantees thereof, are herein referred to collectively as the "Leases");

                    (B) The  copies of the  Leases  provided  to Buyer are true,
accurate  and  complete,  are in full force and effect and none of them has been
modified, amended or extended;

                    (C) There are no security  deposits or other  deposits other
than those listed on Schedule D.

               (iv) Service and  Management  Contracts.  To the best of Seller's
knowledge, except as set forth on Schedule E, neither Seller nor any other party
has entered into any construction,  design, engineering,  service,  maintenance,
supply, brokerage/leasing agreements, employee agreements,  management contracts
or Leases of personal  property  (collectively,  "Service/Equipment  Contracts")
affecting the construction, use, ownership,  maintenance and/or operation of the
Property that will continue  subsequent to the Closing.  Seller shall terminate,
at Seller's sole cost and expense, all  Service/Equipment  Contracts which Buyer
does not elect to assume in writing prior to the expiration of the Study Period.
All work  required  to be  performed  by Seller in  connection  with all Service
Equipment  Contracts or other contracts or requirements  with respect to periods
prior to the date of Closing  has been or will be fully  performed  and that all
such bills in connection with such work will be Seller's responsibility.  Seller
is not in default and to best of Seller's knowledge no other party is in default
under the Service/Equipment Contracts.

               (v) Hazardous Substances.  To the best of Seller's knowledge, (i)
the  Property  has not  been  used for the  generation,  treatment,  storage  or
disposal of any hazardous substances during the period in which Seller has owned
the  Property;  and (ii) there are no  underground  storage  tanks located on or
under  the  Property.  For the  purposes  of this  Section  9(a)(v),  "hazardous
substances" shall include "hazardous substances" as defined in the Comprehensive
Environmental  Response  Compensation and Liability Act of 1980, as amended,  42
U.S.C.  ss.ss.  9601 et. seq., and regulations  adopted pursuant to said Act, or
any similar  environmental  protection law of the state in which the Property is
located or its political subdivisions.

               (vi)  Ability  to  Perform.  Seller  has full  power to  execute,
deliver and carry out the terms and  provisions of this  Agreement and has taken
all necessary  action to authorize the  execution,  delivery and  performance of
this  Agreement,  and this Agreement  constitutes  the legal,  valid and binding
obligation  of  Seller  enforceable  in  accordance  with its  terms.  No order,
permission,   consent,  approval,   license,   authorization,   registration  or
validation  of, or filing  with,  or  exemption  by,  any  governmental  agency,
commission,  board or public authority is required to authorize,  or is required
                                       10
<PAGE>

in connection with, the execution, delivery and performance of this Agreement by
Seller or the taking by Seller of any action contemplated by this Agreement.

     The execution and delivery of this Agreement and the closing  documents and
the consummation of the transactions  contemplated  hereby will not result in or
constitute  any of the following:  (i) a default,  breach,  or violation,  or an
event that, with notice or lapse of time or both, would be a default, breach, or
violation,  of the  organizational  documents of Seller or any of the  following
with  respect to Seller or the  Property:  any  agreements,  contracts,  leases,
promissory  notes,   conditional  sales  contracts,   commitments,   indentures,
mortgages,  deeds of trust, or other agreements,  instruments or arrangements to
which  Seller is a party or by which it or the Property is bound and that relate
to the  Property;  (ii) a violation of or conflict with any term or provision of
any  judgment,  decree,  order,  statute,  injunction,  rule or  regulation of a
governmental  unit  applicable to Seller or the Property;  (iii) the creation or
imposition  of any lien,  charge or  encumbrance  on the  Property;  or (iv) not
require approval, waiver or authorization from a governmental or regulatory body
which has not been obtained.

               (vii)  Compliance  with Laws,  Etc.  Neither the entering into of
this Agreement nor the consummation of the transaction  contemplated hereby will
constitute or result in a violation or breach by Seller of any judgment,  order,
writ,  injunction or decree issued against or imposed upon it, or will result in
a violation of any applicable law, order, rule or regulation of any governmental
authority.   There  are  no  actions,   suits,   proceedings,   arbitrations  or
investigations pending or threatened against, relating to or affecting Seller or
the Property which might  interfere in a material  respect with the  transaction
contemplated by this  Agreement,  become a cloud on the title to the Property or
any portion  thereof or  otherwise  affect the  Property or Seller's  ability to
consummate the transaction contemplated hereby.

               (viii) No  Violation  Notice.  Except as set forth in Schedule F,
Seller has not received  notices:

                    (A) from any federal,  state,  county or municipal authority
alleging any fire, health, safety, building, pollution, environmental, zoning or
other  violation  of law  in  respect  of the  Property  or  any  part  thereof,
including, without limitation, the occupancy or operation thereof, which has not
been entirely corrected;

                    (B) concerning the possible or anticipated  condemnation  of
any part of the Property, or the widening,  change of grade or limitation on use
of streets  abutting the same or  concerning  any special  taxes or  assessments
levied or to be levied against the Property or any part thereof;

                    (C)  concerning  any  change in the zoning or other land use
classification of the Property or any part thereof.

                    (D) of any pending insurance claim.

                    (E)  from any  governmental  authority  that  any  licenses,
permits,  certificates,   easements  and  rights  of  way,  including  proof  of
dedication,  required from any authorities having jurisdiction over the Property
or from private  parties for the existing  use,  occupancy  and operation of the
Property and to insure  vehicular and pedestrian  ingress to and egress from the
Property are in violation of any governmental laws or regulations, which has not
been corrected or will not be corrected by Closing.

               (ix)  No  Management  Contracts,  Employment  Contracts,  Unions,
Pension Plans. Seller has not entered into any management contracts,  employment
contracts  or labor union  contracts  and has not  established  any  retirement,
health  insurance,  vacation,  pension,  profit  sharing or other  benefit plans
relating to the operation or  maintenance  of the Property for which Buyer shall
have any liability or obligation. Seller has no employees at the Property, other
than at-will  employees who shall remain the  responsibility of Seller and as to
whom Buyer shall have no liability or obligation whatsoever.  As of the Closing,
there shall be no employees  working at the Property.  Seller shall have paid or
                                       11
<PAGE>

caused  to be paid to all  employees  of the  Seller  all  salary  and any other
payments which shall be payable on account of each such employee for such period
through Closing. Seller agrees to defend, indemnify and hold Buyer harmless from
any loss, expense,  cost and/or damage (including without limitation  reasonable
attorneys' fees and costs incurred in the defense of such claims) resulting from
claims  well-founded  or  unfounded,  by or on behalf of persons who are to have
been  employees of Seller on or prior to the Closing  arising out of any matter,
cause or thing prior to the Closing or any claims which may have  accrued  prior
to the Closing.

               (x) Seller has not received any written notice of the termination
or impairment of the furnishing of services to the Property of water, sewer, gas
(if any), electric, telephone, drainage and other such utility services.

               (xi) Assessments. Seller has not received notice that assessments
for public  improvements  have been made against the Property  which are unpaid,
including,  without limitation, those for construction of sewer and water lines,
streets,  sidewalks and curbs. To the best of Seller's  knowledge,  there are no
pending  or  proposed  special  assessments  affecting  or which may  affect the
Property or any portion thereof.

               (xii) Pre-Closing Deliveries Accurate. Except with respect to the
Certified  Rent Roll, to the best of Seller's  knowledge,  all of the documents,
writings and other  matters  delivered by Seller to Buyer  pursuant to Section 4
and information provided to Buyer pursuant to the terms of this Agreement, as of
the date hereof, and as of the Closing,  are true,  accurate and complete in all
material  respects and accurately  indicate all of the  information  referred to
therein,  are not  misleading  in any  respect,  and  none  of such  disclosures
misstated any material facts or omitted to state any material facts necessary to
make the  statements  made, in the light of the  circumstances  under which they
were made, not misleading.  This representation  shall only be applicable to due
diligence items listed on Schedule B and not any items delivered thereafter.

               (xiii) Miscellaneous Representations and Warranties.

                    (A) Seller agrees to conduct the business  operations of the
Property in the Seller's usual and normal manner until the Closing. Seller shall
not,  without the prior written consent  thereto of Buyer,  make (or permit) any
physical change in the Property.

                    (B) All bills and claims for labor  performed  and materials
furnished  to or for the benefit of the  Property  for all periods  prior to the
Closing  date  have  been  paid by  Seller  or will be paid by  Seller as of the
Closing.

                    (C) (Intentionally Deleted)

                    (D)  Seller is not a  "foreign  person",  as  defined in the
Internal Revenue Code.

                    (E) The premiums are paid and current for  replacement  cost
insurance  policies on the  Property  and,  to the best of  Seller's  knowledge,
insurance policies are in full force and effect.

               (xiv) All documents  executed by Seller which are to be delivered
to Buyer at the Closing are or at the Closing will be duly authorized,  executed
and delivered by Seller, are or at the Closing will be legal, valid, and binding
obligations of Seller,  are  sufficient to convey title,  and do not violate any
provisions  of any  agreement  to  which  Seller  is a party  or to  which it is
subject.

               (xv) Additional  Representations and Warranties Regarding Parcels
of Land with No Improvements: (Intentionally Deleted)

               (xvi)  Additional  Representation  and Warranties  Regarding Land
Under a Ground Lease: (Intentionally Deleted)

                                       12
<PAGE>

               (xvii)  Additional   Representations  and  Warranties   Regarding
Properties Where Improvements Are Under Construction. (Intentionally Deleted)

               (xviii)  Additional   Representations  and  Warranties  Regarding
Properties with Covenants, Conditions and Restrictions.

                    Seller  represents  and  warrants  that  (i) to the  best of
Seller's  knowledge that the Property  conveyed pursuant to the Agreement is not
in  default  in  the  performance  of any  covenant,  condition  or  restriction
contained in any  Declaration  of  Covenants,  Conditions  or  Restrictions,  as
amended, as more fully described in the Title Policy ("CCRs"),  and no condition
or circumstance  exists which, with the giving of notice or the passage of time,
would constitute a default thereunder;  (ii) no assessments,  payments,  fees or
expenses are  presently  due and payable  under such CCRs;  (iii) Seller  hereby
represents and warrants that none of the property  conveyed hereby is subject to
the terms of a  repurchase  option,  right of first  refusal or other  option to
purchase  such  property,  or  declarant's  right of approval  (individually,  a
"Right";  collectively,  the  "Rights"),  which Right has not lapsed,  fully and
irrevocably,   prior  to  being  exercised  by  the  beneficiary  thereof.  This
representation  and  warranty  shall  survive  for the period of any  applicable
statute of limitations  with regard to such Rights and shall be null and void in
the  event  any such  action  is  triggered  by an  affirmative  action of Buyer
(provided,  however,  the  foregoing is not intended to mean that the statute of
limitations  commences on the date  hereof);  (iv) Buyer and Seller  acknowledge
that all  setback  violations  and  landscaping  violations  with  regard to the
Properties,  if any, have been satisfied by credits at Closing on the Settlement
Statement.  Buyer hereby  agrees that upon  assumption of title it will not take
action to initiate any such option or revoke approval  against the Property;  in
such event  this  representation  shall be null and void and Buyer  shall not be
entitled to claim a Seller default for any action taken by Buyer.

          (b) Buyer hereby  represents  and  warrants to Seller as follows:  (i)
Buyer is a California limited  partnership,  duly organized and validly existing
under the laws of the State of California; all documents executed by Buyer which
are to be  delivered  to Seller at Closing  are or at the  Closing  will be duly
authorized,  executed, and delivered by Buyer, and are or at the Closing will be
legal,  valid,  and binding  obligations of Buyer, and do not and at the Closing
will not violate any provisions of any agreement to which Buyer is a party or to
which it is  subject;  and (ii)  Buyer  shall  furnish  all of the funds for the
purchase of the Property  (other than funds  supplied by  institutional  lenders
which will hold valid  mortgage  liens against the Property) and such funds will
not be from sources of funds or properties derived from any unlawful activity.

     10.  RESPONSIBILITY  FOR  VIOLATIONS.  All notices of  violations  of laws,
ordinances,  or regulations  ("Violations of Law"),  which are received prior to
the  Closing  from  any  governmental   department,   agency  or  bureau  having
jurisdiction  as to  conditions  affecting  the  Property  shall be  remedied or
complied  with by Seller.  If any such  violations  are subject to  challenge or
objection by Seller or are the  obligation of any tenant under the terms of such
tenant's  lease,  Buyer shall  cooperate  with  Seller to defend such  challenge
and/or require tenant to cure such  violation.  Seller shall indemnify the Buyer
for the  reasonable  third-party  cost  of such  challenge  incurred  by  Buyer,
including reasonable attorney's fees. These obligations shall survive closing on
the part of both parties.

     11. MAINTENANCE OF INSURANCE.  Until the Closing, Seller shall maintain its
present insurance on the Property. The risk of loss in and to the Property shall
remain vested in Seller until the recordation of the Deed to Buyer.

     12. CASUALTY OR CONDEMNATION.  If prior to the Closing, the Property or any
"material"  portion thereof is damaged or destroyed by fire or casualty,  or any
part of the Property is taken or threatened to be taken by eminent domain by any
governmental  entity,  then Buyer shall have the option,  exercisable by written
notice given to Seller at or prior to the Closing,  either to (a) terminate this
Agreement,  whereupon all  obligations  of all parties  hereto shall cease,  the
Deposit shall be returned to Buyer and this Agreement  shall be void and without
recourse to the parties hereto except for provisions  which are expressly stated
to survive such  termination;  or (b) proceed with the purchase of the Property,
and in such case,  unless Seller shall have previously  restored the Property to
its condition prior to the occurrence of any such damage or destruction,  Seller
shall pay over or assign to Buyer, without recourse, all amounts received or due
(plus an amount equal to the sum of any  deductible  under any insurance  policy
covering the Property and any  additional  proceeds  which shall be necessary to
                                       13
<PAGE>

effect such restoration) from, and all claims against,  any insurance company or
governmental entity as a result of such destruction or taking, together with any
additional proceeds which shall be necessary to effect such restoration.  Within
five (5) days after receipt of written notice of such casualty or  condemnation,
Buyer will advise  Seller in writing  whether Buyer desires to proceed with this
transaction in light of such casualty or  condemnation.  The term  "material" as
used in this Section 12 shall mean damage or  destruction  in an amount equal to
or greater than 5% of the Purchase Price.

     13. INDEMNIFICATION.  Each party hereby agrees to indemnify the other party
and hold it harmless from and against any and all claims, demands,  liabilities,
costs, expenses,  penalties,  damages and losses, including, without limitation,
reasonable  attorneys' fees, resulting from any  misrepresentations or breach of
warranty or breach of covenant  made by such party in this  Agreement  or in any
document, certificate, or exhibit given or delivered to the other pursuant to or
in connection with this Agreement except as provided herein.

     14. CONDITION OF PROPERTY.  At or before the Approval Date, Buyer will have
approved the physical and  environmental  characteristics  and  condition of the
Property, as well as the economic  characteristics of the Property. Buyer hereby
waives  any  and  all  defects  in  the  physical,  environmental  and  economic
characteristics  and condition of the Property  which would be disclosed by such
inspection  which  exist as of the  Approval  Date  except  such waiver does not
extend  to or  negate  the  effect  of any  matters  which  are  covered  by any
representation, warranty or covenant of Seller in Section 9 of this Agreement or
in any of the conveyance  documents,  Buyer further  acknowledges that except as
set forth in this  Agreement,  neither  Seller nor any of  Seller's  officers or
directors, nor Seller's employees, agents, representatives,  or any other person
or  entity  acting  on behalf of  Seller  (hereafter,  for the  purpose  of this
Section, such persons and entities are individually and collectively referred to
as the  "Seller")  have  made  any  representations,  warranties  or  agreements
(express or implied) by or on behalf of Seller as to any matters  concerning the
Property,  the economic results to be obtained or predicted,  or the present use
thereof or the suitability for Buyer's intended use of the Property,  including,
without  limitation,   the  following:   suitability  of  the  topography;   the
availability  of water  rights or  utilities;  the  present  and future  zoning,
subdivision  and any and all other land use matters;  the condition of the soil,
subsoil,  or  groundwater;  the  purpose(s)  to which the  Property  is  suited;
drainage;  flooding;  access to public  roads;  or  proposed  routes of roads or
extensions   thereof.   Buyer  acknowledges  and  agrees  that  except  for  the
representations and warranties contained herein and in the conveyance documents,
the Property is to be  purchased,  conveyed and accepted by Buyer in its present
condition,  "as is" and that no  patent  or latent  defect  in the  physical  or
environmental  condition  of the  Property  whether or not known or  discovered,
shall affect the rights of either party  hereto.  Except as set forth in Section
9,  any  documents  furnished  to  Buyer  by  Seller  relating  to the  Property
including, without limitation,  service agreements,  management contracts, maps,
surveys,  studies,  pro formas,  reports and other  information  shall be deemed
furnished as a courtesy to Buyer but without warranty from Seller. All work done
by Buyer in  connection  with  preparing  the Property for the uses  intended by
Buyer including any and all fees, studies, reports,  approvals,  plans, surveys,
permits,  and any expenses whatsoever  necessary or desirable in connection with
Buyer's  acquiring,  developing,  using and/or  operating the Property  shall be
obtained and paid for by, and shall be the sole  responsibility of Buyer.  Buyer
has  investigated and has knowledge of operative or proposed  governmental  land
use laws and  regulations to which the Property may be subject and shall acquire
the Property upon the basis of its review and determination of the applicability
and effect of such laws and regulations.

               Except for the  representations  and  warranties  in Section 9 of
this Agreement,  Buyer has neither received nor relied upon any  representations
concerning such land use laws and regulations from Seller.

               Except  for  the  representations,   warranties  and  indemnities
provided by Seller contained  herein and in the documents  delivered at Closing,
Buyer,  on behalf of itself and its  employees,  agents,  successors and assigns
attorneys and other  representatives,  and each of them,  hereby releases Seller
from and  against any and all claims,  demands,  causes of action,  obligations,
damages  and  liabilities  of any nature  whatsoever,  directly  or  indirectly,
arising out of or related to the condition of the Property.

               By signing in the space  provided below in this Section 14, Buyer
acknowledges that it has read and understood the provisions of this Section 14.
  
                                     14
<PAGE>

                                  BUYER:
                                  ------

                                  By:  PS BUSINESS PARKS, INC.,
                                       a California corporation, General Partner

                                       By:/s/ Ronald L. Havner, Jr.
                                          ------------------------------
                                          Ronald L. Havner, Jr.
                                          President and Chief Executive Officer

     15. POSSESSION.  Buyer shall have and as a condition  precedent to Closing,
the right of  possession  on the Closing Date,  provided,  however,  that Seller
shall  allow  authorized  representatives  of  Buyer  reasonable  access  to the
Property for the purposes of satisfying  Buyer with respect to  satisfaction  of
any conditions precedent to the Closing contained herein.

     16.  TAX-DEFERRED  EXCHANGE.  Buyer and Seller agree that, at Seller's sole
election,  this  transaction  shall be  structured  as an exchange of  like-kind
properties  under Section 1031 of the Internal  Revenue Code of 1986, as amended
(the "Code"),  and the  regulations  and proposed  regulations  thereunder.  The
parties agree that if Seller wishes to make such  election,  it must do so prior
to the Closing Date. If Seller so elects,  Buyer shall reasonably cooperate with
Seller,  provided any such exchange is consummated pursuant to an agreement that
is  mutually  acceptable  to Buyer and Seller and which  shall be  executed  and
delivered  on or  before  the  Closing  Date.  Seller  shall  in all  events  be
responsible for all costs and expenses  related to the Section 1031 exchange and
shall fully  indemnify,  defend and hold Buyer harmless from and against any and
all liability,  claims,  damages,  expenses (including reasonable attorneys' and
paralegal  fees  and  reasonable  attorneys'  and  paralegal  fees  on  appeal),
proceedings  and causes of action of any kind or nature  whatsoever  arising out
of, connected with or in any manner related to such 1031 exchange that would not
have been  incurred by Buyer if the  transaction  were a purchase for cash.  The
provisions of the immediately  preceding  sentence shall survive closing and the
transfer of title to subject Property to Buyer.  Notwithstanding anything to the
contrary  contained in this  Section,  any such Section 1031  exchange  shall be
consummated through the use of a facilitator or intermediary so that Buyer shall
in no event be requested or required to acquire title to any property other than
the Property.

     17. MISCELLANEOUS.

          (a) Notices.  Any notice  required or permitted to be given under this
Agreement shall be in writing and addressed as follows:

                    If to Seller:

                    Principal Mutual Life Insurance Company
                    c/o Law Department
                    711 High Street
                    Des Moines, Iowa  50392-0301
                    Attn:  Dennis D. Ballard

                    With a copy to:

                    Principal Mutual Life Insurance Company
                    c/o CRE-Equities
                    711 High Street
                    Des Moines, Iowa  50392-1370
                    Attn:  Michael S. Duffy

                                       15
<PAGE>

                    If to Buyer:

                    PS  Business Parks, Inc.
                    701 Western Ave., Suite 200
                    Glendale, CA 91201
                    Attention:  Ronald L. Havner, Jr.

                    with a copy to:

                    PS Business Parks, Inc.
                    701 Western Avenue, Suite 200
                    Glendale, California 91201
                    Attention:  David Goldberg, Esq., General Counsel

                    and a courtesy copy which shall not be required for valid
                    notice to:

                    Hale and Dorr LLP
                    1455 Pennsylvania Avenue, N.W.
                    Washington, D.C. 20004
                    Attention:  Steven S. Snider, Esq.

Unless otherwise specified herein, such notices or other communications shall be
deemed to be effective:  (i) one (1) business day after deposit with the courier
if sent by Federal Express or other recognized  overnight  delivery service;  or
(ii) upon receipt if  accomplished  by hand delivery or by confirmed  telecopied
delivery.  Either party may, from time to time, by notice in writing served upon
the other party,  in the same manner as prescribed  in this Section  designate a
different  mailing  address or a different  person to which all such notices are
thereafter to be addressed.

          (b) Brokers and Finders. Neither party has had any contact or dealings
regarding  the Property,  or any  communication  in connection  with the subject
matter of this  transaction,  through any licensed real estate  broker,  entity,
agent,  commission  salesperson,  or  other  person  who  will  claim a right to
compensation  or a commission  or finder's fee as a procuring  cause of the sale
contemplated herein,  except for Chadwick,  Saylor & Co., Inc., whose commission
shall be paid by Buyer.  In the event that any  company,  firm,  broker,  agent,
commission  salesperson or finder  perfects a claim for a commission or finder's
fee based upon any such contract,  dealings or communication,  the party through
whom the company,  firm, broker, agent,  commission  salesperson or finder makes
his claim  shall be  responsible  for said  commission  or fee and all costs and
expenses (including  reasonable  attorneys' fees) incurred by the other party in
defending against the same. No commission shall be paid or become payable unless
the Closing actually occurs. The provisions of this Subsection (b) shall survive
Closing and any termination, cancellation or recision of this Agreement.

          (c) Successors and Assigns.  This Agreement shall be binding upon, and
inure to the  benefit of, the parties  hereto and their  respective  successors,
heirs,  administrators and assigns;  provided further, however, Seller's consent
to an assignment of Buyer's rights and delegation of its  obligations  hereunder
shall not be required with respect to an  assignment of this  Agreement by Buyer
to any person or any  corporation,  general  partnership,  limited  partnership,
limited liability company or other lawful entity which is controlled by or under
common control with Buyer.

          (d) Amendments and Terminations.  Except as otherwise provided herein,
this Agreement may be amended or modified by, and only by, a written  instrument
executed by Seller and Buyer.
                                       16
<PAGE>

          (e) Governing Law. This  Agreement  shall be governed by and construed
in accordance with the laws of the State of Oregon.

          (f) Merger of Prior  Agreements.  This Agreement  supersedes all prior
agreements and understandings between the parties hereto relating to the subject
matter hereof.

          (g) Enforcement. In the event either party hereto fails to perform any
of its  obligations  under  this  Agreement  or in the  event a  dispute  arises
concerning the meaning or interpretation of any provision of this Agreement, the
defaulting  party or the party not  prevailing in such dispute,  as the case may
be,  shall pay any and all costs and  expenses  incurred  by the other  party in
enforcing or establishing its rights hereunder,  including,  without limitation,
court costs and reasonable  attorneys'  fees.  Buyer and Seller both acknowledge
each has been  advised  by  counsel as to their  respective  rights,  duties and
obligations in this Agreement and have had ample  opportunity to negotiate same.
Thus,  both Buyer and Seller  acknowledge  that any ambiguity in this  Agreement
should not necessarily be resolved against the drafter of this Agreement.

          (h) Time of the Essence. Time is of the essence of this Agreement.

          (i) Counterparts. This Agreement may be executed in counterparts, each
of which shall be deemed to be an  original,  but such  counterparts  when taken
together shall constitute but one Agreement.

          (j) Survivability.  Except as otherwise provided herein, the covenants
contained in this  Agreement  shall survive the closing of the purchase and sale
and shall not be deemed  merged in the deed,  but shall remain in full force and
effect.

          (k) No  Recordation.  Neither  Seller  nor  Buyer  shall  record  this
Agreement or memorandum  thereof in or among the land or chattel  records of any
jurisdiction.

          (l)  Proper  Execution.  The  submission  by  Seller  to Buyer of this
Agreement  in unsigned  form shall have no binding  force and effect,  shall not
constitute  an option,  and shall not confer any rights upon Buyer or impose any
obligations on Seller  irrespective of any reliance thereon,  change of position
or partial  performance  until Seller shall have executed this Agreement and the
Deposit  shall have been  received  by the Title  Company.  Notwithstanding  the
foregoing  sentence,  Seller's  submission to Buyer of this  Agreement  shall be
deemed withdrawn,  revoked and incapable of being executed by Buyer in the event
Buyer has not returned a duly executed original Agreement to Seller on or before
5:00 p.m. (EST) on April 30, 1998.

          (m) Personal  Liability.  There shall be no personal liability imposed
on the individuals who have executed this Agreement (or the attached exhibits)

          (n)  Survival  of   Representations.   Except  as  expressly  provided
otherwise in this  Agreement,  all  representations  and warranties  made by the
parties herein or in any instrument or document furnished in connection herewith
(except  warranties of title in the  conveyance  documents)  shall survive for a
period of one (1) year from the date of Closing and any action  thereon  must be
commenced  within such period or they are deemed waived and released;  provided,
however,  Representation  9(a)(iii)  regarding  leases  shall  survive  for  the
remaining term of any lease (excluding renewals) for which Buyer did not receive
a tenant estoppel executed prior to Closing;  however, to the extent that tenant
estoppels are obtained post closing,  the survival  period for such leases shall
be one (1) year from the date of Closing.

          (o) Dates.  Whenever used herein, unless expressly provided otherwise,
the term  "days"  shall  mean  consecutive  calendar  days,  except  that if the
expiration  of any time period  measured  in days occurs on a Saturday,  Sunday,
legal holiday or other day when federal offices are closed in Washington,  D.C.,
such expiration shall automatically be extended to the next business day.

                                       17
<PAGE>

          (p) Prior to the Closing,  information received in connection with the
Property shall be kept strictly  confidential  and shall not,  without the prior
consent of the other  party,  be  disclosed  by such other party or used for any
purpose  other than  evaluating  the Property  except in the event of litigation
between the parties hereto,  Buyer and Seller agree that such information  shall
only be  transmitted  to Buyer's and Seller's  respective  officers,  directors,
trustees, employees, attorneys, accountants,  contractors, consultants, advisors
and agents who need to know such  information  for  purposes of  evaluating  the
Property and transactions  contemplated under this Agreement.  The provisions of
this  Section  17(p)  shall  not apply to any  information  which is a matter of
public  record or  obtainable  from other  sources and shall not prevent  either
Buyer or Seller from complying with laws,  rules,  regulations and court orders,
including,  without limitation,  governmental  regulatory,  disclosure,  tax and
reporting requirements.

          (q)  Liability of Sellers.  Any  liability of Seller for damages for a
breach of any representations, warranties or covenants in the Agreement shall be
joint and several liability.

     18. ESCROW AGENT. (Intentionally Deleted)

     19. SELLER'S ADDITIONAL  AGREEMENTS RELATED TO PROPERTIES WITH IMPROVEMENTS
UNDER CONSTRUCTION. (Intentionally deleted)

     20. TANK REMOVAL  INDEMNITY.  Seller shall  indemnify Buyer for any and all
losses, liabilities and costs (including reasonable attorneys' fees) relating to
the removal of the water tank and test required by Spencer  Environmental's plan
attached  as  Exhibit  XX with  respect  to space  occupied  by  Epitope  at the
Creekside  Property  until such time, if any, that Seller  delivers to Buyer the
Indemnification Agreement of Epitope in the form attached as Exhibit XX.


                                       18
<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first above written.


                                  SELLER:
                                  -------

                                  PRINCIPAL MUTUAL LIFE INSURANCE
                                  COMPANY, an Iowa corporation


                                  By:  /s/ Jon C. Heiny
                                     -------------------------
                                           Jon C. Heiny
                                  Its: Counsel


                                  By:  /s/ Shannon G. Holz
                                     -------------------------
                                           Shannon G. Holz
                                  Its: Counsel

                                  BUYER:
                                  ------

                                  PS BUSINESS PARKS, L.P.,
                                  a California Limited Partnership

                                  By:  PS BUSINESS PARKS, INC.,
                                       a California corporation, General Partner

                                       By:/s/ Ronald L. Havner, Jr.
                                          ------------------------------
                                          Ronald L. Havner, Jr.
                                          President and Chief Executive Officer

                                          Buyer's Social Security Number or Tax
                                          Identification Number:95-4609260


                                       19
<PAGE>

                                  PETULA ASSOCIATES., LTD.,
                                  an Iowa corporation

                                  By:  /s/ Michael S. Duffy
                                     -------------------------
                                           Michael S. Duffy
                                  Its: Vice President


                                  By:  /s/ Dennis D. Ballard
                                     -------------------------
                                           Dennis D. Ballard
                                  Its: Counsel

                                       20



                                                                    Exhibit 10.3
                     REAL ESTATE PURCHASE AND SALE AGREEMENT


                                 by and between

                     PRINCIPAL MUTUAL LIFE INSURANCE COMPANY
                                     SELLER



                                       and



            TPLP OFFICE PARK PROPERTIES, a Texas limited partnership
                                      BUYER







    Exhibits to this Agreement have been omitted and will be furnished to the
                Securities and Exchange Commission upon Request







<PAGE>

                                    INDEX TO

                     REAL ESTATE PURCHASE AND SALE AGREEMENT





1. Property Included in Sale...............................................1


2. Purchase Price/Remedies.................................................1


3. Title to the Property...................................................2


4. Seller's Pre-Closing Deliveries.........................................2


5. Buyer's Due Diligence...................................................3


6. Buyer's Conditions to Closing...........................................4


7. Seller's Conditions to Closing..........................................4


8. The Closing.............................................................4


9. Representations and Warranties..........................................9


10. Responsibility for Violations..........................................14


11. Maintenance of Insurance...............................................14


12. Casualty or Condemnation...............................................14


13. Indemnification........................................................14


14. Condition of Property..................................................15

<PAGE>

15. Possession.............................................................15
 

16. Tax-Deferred Exchange..................................................15


17. Miscellaneous..........................................................16


18. Escrow Agent...........................................................19

 



                                      3
<PAGE>
                     REAL ESTATE PURCHASE AND SALE AGREEMENT

     THIS REAL ESTATE  PURCHASE AND SALE AGREEMENT (the  "Agreement") is made as
of the 30th day of April,  1998 (the "Agreement  Date") which shall be the later
to occur of  execution  of this  Agreement  by Buyer or  Seller  by and  between
PRINCIPAL MUTUAL LIFE INSURANCE COMPANY, an Iowa corporation, herein referred to
as  "Seller",  and TPLP OFFICE PARK  PROPERTIES,  a Texas  limited  partnership,
herein referred to as "Buyer."

                                R E C I T A L S:

     WHEREAS,  Seller desires to sell certain  improved real property along with
certain related personal and intangible property,  and Buyer desires to purchase
said real,  personal and  intangible  property on the terms and  conditions  set
forth herein;

     NOW,   THEREFORE,   in  consideration  of  the  foregoing  and  the  mutual
undertakings  set forth  herein,  and for good and valuable  consideration,  the
receipt and  sufficiency of which is hereby  acknowledged,  the Buyer and Seller
hereby agree as follows:

     1.  Property  Included in Sale.  Seller hereby agrees to sell and convey to
Buyer,  and Buyer hereby agrees to purchase  from Seller,  at the price and upon
the terms and conditions set forth in this Agreement, the following:

          (a) that certain real property more particularly  described in Exhibit
A attached hereto (the "Real Property");

          (b) all right, title and interest of Seller in all rights, privileges,
alleys,  strips and gores,  rights of way and easements  appurtenant to the Real
Property,  including,  without  limitation,  all  minerals,  oil,  gas and other
hydrocarbon  substances as well as all development  rights,  air rights,  water,
water rights (and water  stock,  if any)  relating to the Real  Property and any
easements,  rights-of-way  or other  appurtenances  used in connection  with the
beneficial use and enjoyment of the Real Property;

          (c) all  improvements  and  fixtures  located  on the  Real  Property,
including all buildings and  structures  presently  located on the Real Property
listed on  Schedule A, as more  particularly  described  in Exhibit A,  attached
hereto,  and all related  facilities,  amenities,  all apparatus,  equipment and
appliances  used in  connection  with the  operation  or  occupancy  of the Real
Property,  such as heating and air  conditioning  systems and facilities used to
provide any utility  services,  refrigeration,  ventilation,  garbage  disposal,
recreation or other services on the Real Property (all of which are collectively
referred to as the "Improvements");

          (d) all tangible or intangible  personal  property owned by Seller and
used  in  the  ownership,   use  or  operation  of  the  Real  Property   and/or
Improvements, including, without limitation, the right to use any trade name now
used in  connection  with the Real Property (the  "Personal  Property")  and any
contract or lease rights, agreements, utility contracts or other rights relating
to the ownership, use and operation of the Real Property.

          (e) all of Seller's interest as lessor in all leases covering the Real
Property and Improvements,  including all tenant security and other deposits and
interest earned thereon and prepaid rent and interest  earned thereon.  Interest
on deposits and prepaid rents shall only be  transferred  to Buyer if applicable
state  law or  the  applicable  lease  requires  that  such  funds  be  held  in
interest-bearing accounts.

          All of the items referred to in Subsections (a), (b), (c), (d) and (e)
above are hereinafter collectively referred to as the "Property."

     2. PURCHASE PRICE/REMEDIES.MEDIES

          (a) The total purchase  price (the "Purchase  Price") for the Property
is Twenty-one Million Seven Hundred Fifty-eight  Thousand Eight Hundred Nineteen
and  No/100  Dollars  ($21,758,819.00).  The  Purchase  Price is payable by wire
transfer of  immediately  available  funds in U.S.  dollars via the federal bank
wire  transfer  system  to  Chicago  Title  Insurance  Company,  San  Francisco,
California (the "Title Company") at Closing.


<PAGE>

          (b) (Intentionally Deleted)

          (c) (Intentionally Deleted)

          (d) (Intentionally Deleted)

          (e) (Intentionally Deleted)

          (f) (Intentionally Deleted)

     3. TITLE TO THE PROPERTY.

          (a) At the  Closing,  Seller  shall  convey to Buyer  and Buyer  shall
accept  title to the Property  (in fee simple) in  accordance  with the terms of
this Agreement, and Buyer's obligation to accept said title shall be conditioned
upon Buyer then being  conveyed good and clear record,  marketable and insurable
title in fee simple to the Real Property,  all rights,  privileges and easements
appurtenant thereto, and to the Improvements,  by duly executed and acknowledged
special warranty deed. It shall be a condition  precedent to Buyer's  obligation
to close  hereunder that the Title Company stands ready to issue, at the Closing
a TLTA  standard  full  coverage  form Owner's  Policy of Title  Insurance  with
extended coverage and all endorsements  reasonably requested by Buyer,  insuring
Buyer's interest in the Property,  dated the date of Closing,  with liability in
the amount of the Purchase Price,  subject only to the Permitted Exceptions (the
"Title Policy").  The Title Policy shall insure against all mechanics' liens and
shall  have full  survey  coverage  and  shall be an  extended  coverage  policy
insuring against, among other things,  mechanics' liens, easements and claims of
parties in  possession  not shown by the public  records  with all  general  and
standard exceptions  deleted.  Seller shall pay the cost of the standard owner's
policy.  Buyer shall bear the expense for extended  coverage and the cost of any
endorsements requested by Buyer.

          (b) Buyer  shall,  prior to the  Approval  Date,  provide  Seller with
Buyer's  objections to any matters disclosed by the Commitment,  Title Documents
or Survey.  All matters shown on the Title  Exceptions which are not objected to
by Buyer prior to the  Approval  Date shall be  "Permitted  Exceptions".  Seller
agrees  to use its best  efforts  to  satisfy  such  objections  noted by Buyer,
provided  that (i) Seller shall obtain a  satisfaction  and release or bond over
any monetary liens,  in a manner  reasonably  satisfactory to Buyer,  including,
without limitation,  any and all mortgages,  mechanics' liens and judgment liens
(collectively,  "Monetary  Liens");  and (ii) Seller  shall not be  obligated to
litigate or spend more than  $10,000.00  in the  aggregate to cure  non-monetary
lien objections or to seek any cure which cannot be obtained within fifteen (15)
days.  Seller shall notify  Buyer of Seller's  proposed  actions to satisfy such
objections, and shall have up to the Closing Date to satisfy such objections and
the Closing  Date shall be extended a reasonable  period of time,  not to exceed
fifteen (15) days, if necessary to allow such cure period.  If, despite its best
efforts to do so, Seller cannot satisfy such objections (other than the Monetary
Liens,  which  shall be  satisfied  or bonded  over by  Seller) on or before the
expiration  of such  additional  fifteen  (15) day period,  Buyer shall have the
option to waive its  objection(s)  to such  title  and/or  other  defect(s)  and
proceed to Closing or terminate this  transaction.  Buyer  acknowledges that the
termination of the  transaction  pursuant to this section of the Agreement shall
not entitle Buyer to receive  reimbursement  for third party expenses or to seek
specific performance or any other legal or equitable remedy against Seller.

     4. SELLER'S PRE-CLOSING DELIVERIES.

          Buyer  acknowledges  that prior to execution of this Agreement  Seller
has  delivered  the items listed in Schedule B for Buyer's  review and approval.
Seller shall be under no further obligation to deliver additional items to Buyer
unless Buyer requests such items prior to the Approval Date and such  additional
items are reasonably  necessary to complete Buyer's due diligence.  Seller shall
only be obligated to provide such  additional  items if: (i) the items requested
are in Seller's or Seller's  property  manager's  actual  possession or control;
(ii) the items are not  privileged;  and (iii) Buyer has identified the specific
property for which the item is requested.

                                       2
<PAGE>

     5. BUYER'S DUE  DILIGENCE.  Buyer shall be allowed to conduct the following
due diligence prior to purchasing the Property:

          (a) Review and approve title to the Property as shown on a preliminary
title report (the "Title Report") from the Title Company.

          (b) Review and approve the  operating  statements  of the Property for
the previous two (2) calendar years as well as the current calendar year-to-date
and audited  financial  statements for 1997,  provided same are available and in
Seller's  actual  possession.  Buyer  acknowledges  that  no  audited  financial
statements are available from Seller for the properties listed on Schedule A.

          (c) Review and approve true, correct and complete copies of all tenant
leases  relating to the Property and a certified rent roll of even date herewith
in the form attached hereto as Exhibit B, (the "Certified Rent Roll").

          (d) Review and approve copies of any site plans and building  drawings
and  specifications  and existing  environmental  reports in the  possession  or
control of the Seller.

          (e)  Review  and  approve  copies  of  any   maintenance  and  service
agreements currently in force.

          (f) Review and approve an as-built  survey showing the location of all
improvements and recorded easements on the Property.

          (g) Performance of a feasibility study of the Property, including, but
not  limited  to,  review  and  approval  of  the  physical  and   environmental
characteristics  and condition of the Property and  performance of marketing and
feasibility  studies,  structural and  engineering  investigations,  auditing of
books and  records of the  Property,  financial  analyses  and  verification  of
existing   zoning..   Seller   agrees  to  provide  Buyer  and  its  agents  and
representatives  reasonable  access to the Property  and to all books,  records,
files,  financial  data,  leases and  contracts  relating to the Property and to
reasonably  cooperate in such  examinations and to cause the property manager to
reasonably  cooperate in such examinations  following the Agreement Date for the
purpose of performing,  at Buyer's sole cost and expense,  the  above-referenced
studies,  physical  inspections,  investigations  and tests on the Property (the
"Tests") provided that no such tests shall be conducted without at least two (2)
business days prior written  notice to Seller and if any such tests are invasive
Seller's prior approval of such Tests,  which approval shall be in Seller's sole
and absolute discretion.  Notwithstanding anything herein to the contrary, Buyer
shall  not need  Seller's  further  consent  to  conduct  Phase I  environmental
studies. Buyer's access is further conditioned on Buyer complying with the terms
of the Access and Indemnification  Agreement attached hereto as Exhibit E. Buyer
shall be  required  to  conduct  such  Tests in a manner  as to not  disturb  or
interfere  with the  current use of the  Property  and upon  completion  of such
Tests, Buyer agrees at its sole cost to restore the Property to the condition it
was in immediately prior to such Tests, including, but not limited to the prompt
removal of anything placed on the Property in connection with such Tests. Copies
of any third party reports,  letters or other written information generated as a
result of such Tests  shall be provided  to Seller if the sale  contemplated  by
this Agreement does not close for any reason other than Seller's default.  Buyer
shall  indemnify,  defend  (with  counsel  reasonably  satisfactory  to Seller),
protect, and hold Seller harmless from and against any and all liability,  loss,
cost, damage, or expense (including,  without limitation,  reasonable attorney's
fees and costs) which Seller may sustain or incur by reason of or in  connection
with any Tests made by Buyer or Buyer's agents or contractors  relating to or in
connection  with the Property,  or entries by Buyer or its agents or contractors
onto  the  Property.  Notwithstanding  any  provision  to the  contrary  in this
Agreement, the indemnity obligations of Buyer under this Agreement shall survive
any  termination  of this Agreement or the delivery of the deed and the transfer
of title pursuant to this Agreement.

               The items  referred to above in  Subsections  5(a)-(g)  and those
listed on Schedule B shall be  collectively  referred  to as the "Due  Diligence
Items." Buyer acknowledges that Seller has provided Buyer with the Due Diligence
Items prior to execution of this Agreement.

                                       3
<PAGE>

               The date this  Agreement is executed by both parties shall be the
"Approval Date" and upon such execution there shall be a conclusive  presumption
that  Buyer  has  approved  the  Due  Diligence   Items  and  the  physical  and
environmental  condition of the Property.  Notwithstanding the foregoing,  Buyer
shall be entitled to rely upon the  representations and warranties of the Seller
set forth in this Agreement.

     6. BUYER'S CONDITIONS TO CLOSING.  The following  conditions are conditions
precedent to Buyer's obligation to purchase the Property:

          (a)  Seller  shall  conduct  business  at the  Property  in a good and
diligent manner  consistent with Seller's current  business  practices and shall
maintain  the  Property  in its present  condition  through the date of Closing,
reasonable wear and tear excepted.

          (b) Seller have  terminated,  at Seller's  sole cost and expense,  all
Service/Equipment  Contracts except to the extent Buyer has given Seller written
notice that certain  Service/Equipment  contracts  should be continued and Buyer
has assumed post Closing  liability for such contracts,  however,  such services
shall be continued at Seller's expense until the Closing Date.

          (c) The Title  Company  shall stand ready to issue the Title Policy in
the form required herein.

          (d) Delivery by Seller at Closing of the Closing  Documents  described
in Section 8 hereof.

          (e)  Performance  by Seller as and when required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Seller  pursuant to this  Agreement and all of Seller's  representations  and
warranties  contained in this  Agreement  shall be true and correct on and as of
the Closing Date as if made anew on that date.

          (f)  Delivery by Seller of Tenant  Estoppel  Certificates  in the form
attached  hereto as  Exhibit F for  tenants  comprising  at least 80% of the net
rentable  square feet of the Property  which shall include all Tenants listed in
Exhibit F-1, the  substance  and content of which shall be  consistent  with the
Certified  Rent Roll and Seller  shall use  commercially  reasonable  efforts to
obtain the required  Tenant  Estoppel  Certificates.  Buyer shall cooperate with
Seller post Closing to complete  collection  of Tenant  Estoppels.  In the event
sufficient  Tenant  Estoppels  cannot be  obtained,  Buyer shall accept a Seller
Estoppel in the form attached  hereto as Exhibit F-2 and all post Closing Tenant
Estoppels shall be delivered  pursuant to the terms of Exhibit F-2. In the event
that the  conditions  set forth above in this Section 6 are not  satisfied  (and
Buyer is not  otherwise  in  default  of this  Agreement),  Buyer  may  elect to
terminate this Agreement or waive satisfaction of the condition and close escrow
in either instance by giving written notice to Seller.

     7. SELLER'S CONDITIONS TO CLOSING.  The following conditions are conditions
precedent to Seller's obligation to sell the Property:

          (a)  Delivery  by Buyer  at  Closing  of the  Purchase  Price  and the
executed  Assignment  and  Assumption of Leases in the form  attached  hereto as
Exhibit G.

          (b)  Performance  by Buyer as and when  required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Buyer pursuant to this Agreement.

               In the  event  that  the  conditions  in this  Section  7 are not
satisfied, Seller may elect, at its sole discretion, to terminate this Agreement
or waive satisfaction of the condition and close escrow.

     8. THE CLOSING.

          (a) The Closing  hereunder  shall be held and delivery of all items to
be made at the Closing  under the terms of this  Agreement  shall be made at the
offices of the Title Company on April 30, 1998, or such other date prior thereto
as Buyer and Seller may mutually  agree in writing (the  "Closing  Date").  Such
date may not be extended  without the prior written  approval of both Seller and
                                       4
<PAGE>

Buyer.  In the event the Closing  does not occur on or before the Closing  Date,
the Title Company  shall,  subject to the provisions of Section 2, and unless it
is  notified  by both  parties to the  contrary,  within five (5) days after the
Closing  Date,  return  to the  depositor  thereof  items  which  may have  been
deposited  pursuant  to this  Agreement.  Any such  return  shall not,  however,
relieve  either  party  hereto  of any  liability  it may have for its  wrongful
failure to close. The delivery to the Escrow Agent of the Closing Documents,  as
hereinafter  defined,  by both parties and the Purchase  Price by Buyer shall be
deemed sufficient to effect a closing under Section 8(a).

          (b) At or before  the  Closing,  Seller  shall  deliver  to escrow the
following (collectively, the "Closing Documents"):

               (i) special  warranty deed conveying to the Buyer the Property as
required by Section 3 above in the form attached hereto as Exhibit I;

               (ii) originals or, if Seller does not have  originals,  certified
true, complete and correct copies of all leases (and amendments thereto, if any)
in Seller's actual and physical possession covering any portion of the Property,
any  security  deposits  relating  thereto,   and  an  executed  Assignment  and
Assumption of Lease in the form attached hereto as Exhibit G;

               (iii) a Bill of Sale, in the form attached hereto as Exhibit J;

               (iv) a  certificate  by  Seller  to the  effect  that  all of the
representations,  warranties  and covenants set forth in this  Agreement  remain
true, correct and complete as of the Closing Date;

               (v) a Certified Rent Roll in the form attached  hereto as Exhibit
B, dated as of the date of Closing Date  consistent  with prior  Certified  Rent
Rolls and Tenant Estoppel Certificates;

               (vi)  such  title   affidavits  or  other  documents  as  may  be
reasonably required by the Title Company with copies thereof to the Buyer;

               (vii) all rent records and related documents in the possession or
under the  control of Seller.  Such  records  may include a schedule of all cash
deposits  and a check  or  credit  to  Buyer  in the  amount  of such  deposits,
including any interest  thereon (to the extent that applicable  state law or the
applicable lease requires payment of interest on such amounts) held by Seller at
the Closing under the Lease. To the extent any deposits are in a form other than
cash, such deposits shall be transferred to Buyer at Closing without recourse.

               (viii) To the extent in Seller's possession or control, originals
or copies of all current site plans, surveys,  architectural drawings, plans and
specifications,  engineering  plans and  studies,  floor  plans,  soil  reports,
environmental  studies,  and  landscape  plans.  To the extent such items are in
Seller's  possession  or control,  Seller shall also deliver (i)  originals  (or
copies,  if originals are not then  available) of all then effective  assignable
guaranties,  warranties and/or payments and performance bonds made by any person
for the benefit of Seller with respect to the Property of any of its components,
together with an instrument  assigning  such  guaranties and warranties to Buyer
and (ii)  originals  (or copies,  if originals  are not then  available)  of all
certificates,  Licenses, permits authorizations and approvals issued for or with
respect to the  Property  by  governmental  and  quasi-governmental  authorities
having  jurisdiction,  to the extent  such items are in Seller's  possession  or
control.

               (ix) to the extent available,  originals (or copies, if originals
are not  available)  of all  documents  and books and records  necessary for the
continued operation of the Project,  including without  limitation,  rent rolls,
lease files,  rent records,  escalation  records and statements and  maintenance
records;

               (x) an original resolution of Seller authorizing the execution of
this Agreement,  the conveyance documents and all other documents to be executed
by Seller and the performance by Seller hereunder;

               (xi) Seller's  Non-Foreign  Certification in the form attached as
Exhibit C; and

                                       5
<PAGE>

               (xii) notices to the tenants at the Property in the form attached
as Exhibit D,  executed by Seller  informing  them of the change in ownership of
the Property.

               (xiii) an  executed  Assignment  of  Warranties,  Guarantees  and
Service Contracts in the form attached hereto as Exhibit O.

               Buyer may waive  compliance  on  Seller's  part  under any of the
foregoing items by an instrument in writing.

          (c) At or before  the  Closing,  Buyer  shall  deliver  to escrow  the
Purchase  Price,  as adjusted for  prorations,  and an executed  Assignment  and
Assumption of Leases in the form attached hereto as Exhibit G.

          (d) Seller and Buyer shall each deposit such other  instruments as are
reasonably  required by the escrow holder to close the escrow and consummate the
purchase of the Property in accordance with the terms hereof.

          (e) The following items shall be prorated separately for each property
identified on Schedule A as of 11:59 p.m. on the date immediately  preceding the
Closing Date and the net amount  thereof shall be added to or deducted  from, as
the case may be, the amount of the Purchase Price to be paid at the Closing:

               (i) general real estate,  personal  property and ad valorem taxes
and assessments  for the current tax year of the Property.  If any such taxes or
assessments  are  payable in  installments,  all  installments  due  through the
Closing  together with the accrued but unpaid portion of any other  installments
not yet due as of the Closing shall be paid for by the Seller;

               (ii) taxes,  water,  sewer and front foot  benefit  charges,  and
charges for electricity, gas, telephone and other utilities and license fees;

               (iii)  rent and other  charges  under the  Leases  (to the extent
monies have actually been collected therefor), including any free rent under any
of the  Leases;  Buyer  shall  receive a credit at Closing  for any free rent or
other tenant concessions due under any Lease subsequent to Closing.

               (v) all other income and expenses relating to the Property;

               (vi)  any  other   items  that  are   customarily   prorated   in
transactions  of this  nature;  and  (vii) any and all cash  security  deposits,
prepaid rent and all interest  earned thereon (to the extent interest is payable
to tenant under applicable state law or the applicable  lease) shall be a credit
to Buyer at  Closing.  Seller  shall be fully  liable  for any  wages  and other
amounts due and owing any employees at the Property which have accrued up to the
date of  Closing.  Seller  shall  retain and Buyer  shall not be entitled to any
credit  for,  the  deposits,  if any,  made by  Seller  in  connection  with the
provision of electric, sewer, water, telephone and other utility services to the
Property.

     For  purposes  of  calculating  prorations,  Buyer shall be deemed to be in
title to the  Property,  and,  therefore,  entitled to the income  therefrom and
responsible  for the expenses  thereof for the entire day upon which the Closing
occurs.  All such prorations  shall be made on the basis of the actual number of
days of the month  which  shall have  elapsed as of the date of the  Closing and
based upon the actual number of days in the month and a three hundred sixty-five
(365) day year. The amount of such  prorations  shall  initially be performed by
Seller and  mutually  agreed to by the parties  prior to  Closing,  but shall be
subject to  adjustment  in cash after the Closing  outside of escrow as and when
complete and accurate information becomes available,  if such information is not
available at the Closing. Seller and Buyer agree to cooperate and use their best
efforts to make such adjustments no later than sixty (60) days after the Closing
(except with  respect to property  taxes,  which shall be adjusted  within sixty
(60) days after the tax bills for the applicable period are received).

                                       6
<PAGE>

     Buyer  shall post  Closing  based on April 30,  1998  receivables  purchase
accounts receivable relating to the Property from Seller at a price equal to the
following percentage of such outstanding accounts receivable:

      100% of the amount of accounts receivable less than 31 days old; and
            0% of the amount of accounts receivable over 30 days old;

     The term  "Rent"  as used  herein  shall  mean  all  rents,  including  any
percentage rent and any accrued tax and operating  expense  escalation,  charges
and other revenue of any kind generated  from or in connection  with the Leases.
Except as set forth in this Section  8(e)(vii),  all items of income and expense
which  accrue for the period  prior to the  Closing  will be for the  account of
Seller and all items of income and  expense  which  accrue for the period on and
after the Closing will be for the account of Buyer. Buyer shall receive a credit
against the  Purchase  Price for all amounts of Rent which are  allocable to the
period on and after the Closing and which have  accrued as of the Closing  Date,
including  those Rents which have accrued but remain  uncollected as of the date
of Closing. The provisions of this Section 8(e)(viii) shall survive the Closing.

               (viii)  With  respect  to  expenses  of the  Property  which  are
chargeable  to the tenants  pursuant to the  provisions  of the Leases (the "CAM
Charges"),  Seller  shall  determine  (1) the amount of those  expenses  paid or
payable by Seller from January 1 in the year in which the Closing occurs through
the date of Closing or, with regard to taxes and assessments,  the amount of the
proration  thereof  charged to Seller and (2) the  amount  tenants  have paid to
Seller  from  January 1 in the year in which  Closing  occurs  until the date of
Closing as the  tenants'  pro rata share of such  tenant  expenses.  If accurate
allocations of CAM Charges, accounts receivable, or any other expenses cannot be
made at Closing  because  current  bills are not  obtainable,  the parties shall
allocate  such  expenses  at  Closing on the best and most  current  information
available,  subject to adjustment in cash as soon as reasonably  possible  after
the Closing when final bills or other  evidence of the  applicable  expenses are
received,  but such adjustment  shall be made no later than six (6) months after
the Closing  Date.  Buyer shall also be entitled to a credit at Closing equal to
any CAM  Charges  for 1997 and prior years which are owing to any of the tenants
of the  Property.  The  provisions of this Section  8(e)(vii)  shall survive the
Closing.

               (ix) Those items described in the Settlement  Statement  executed
by the parties hereto of even date herewith.

          (f) The costs  incurred  in this  transaction  shall be  allocated  as
follows:

               (i) Seller shall pay standard  rates for the Title Policy.  Buyer
shall pay for any title endorsements and extended coverage.

               (ii) Buyer shall pay recording fees applicable to the sale.

               (iii) Buyer shall pay the cost of the updated survey.

               (iv) Each party shall pay its own legal fees and expenses and 50%
of all escrow charges.

               (v) Seller shall pay all costs  associated  with the Tax Deferred
Exchange (as described in Section 16 hereof).

          (g) As additional  consideration  for Buyer's  purchasing the Property
and paying the Purchase Price to the Seller,  Seller hereby covenants and agrees
to  remain  fully  liable  for  the   performance  and  payment  of  all  tenant
improvements and the payment of all leasing commissions  currently due and owing
(including  any  delinquent  amounts)  under  any of the  Leases  and  under any
leasing/commission  agreement  up to the Closing  Date except for amounts  which
shall  hereafter  be due  and  owing  under  any  of the  Leases  or  under  any
leasing/commission agreement, including, without limitation, leasing commissions
with  respect to any option to renew or extend the Leases,  (it being  expressly
understood  and agreed that Buyer is assuming the  obligations to perform or pay
for any tenant improvements,  and to pay for any leasing commissions which shall
                                       7
<PAGE>

hereafter be owing under any renewals or  extensions  of the Leases or under any
leasing/commission agreement before or after the Closing Date which are approved
by Buyer).

          (h) Each party hereto shall indemnify, defend and hold the other party
(together with its officers, directors, and employees) harmless from and against
all claims, demands, causes of actions,  judgments,  damages, costs and expenses
(including,  without limitation,  reasonable,  actual attorneys' fees and courts
costs),  deficiencies,  settlements and investigations  which relate to matters,
actions or omissions  which arise out of or are based upon any of the  following
during such parties'  period of ownership,  which for Seller shall be the period
of time prior to Closing  and for Buyer  shall be the period of time on or after
Closing:

               (i) any obligation  under any contracts,  agreements and writings
entered into by or on behalf of such party in respect of the use,  construction,
operation,  ownership,  occupancy or  maintenance of any portion of the Property
arising out of an event occurring during such parties' period of ownership;

               (ii) any accident,  injury,  death or damage whatsoever caused to
any person or entity or loss of property,  occurring in or about the Property or
any part thereof,  or on any other property  connected with or adjacent  thereto
during such parties' period of ownership; or

               (iii) any breach of the  covenant set forth in Section  8(g),  or
with respect to any payment or  performance  obligation  under any of the Leases
for tenant  improvements  or under any of the Leases  and/or  leasing/commission
agreements for leasing commissions which have heretofore accrued,  which are now
due and owing or which shall hereafter accrue, as described in Section 8(g).

               (iv) any breach of a representation or warranty set forth in this
Agreement.

               (v)  Notwithstanding  the above but subject to the limitations on
Seller's  indemnity set forth in Section 8(g),  Seller shall not be  indemnified
for any leasing commissions


                                       8
<PAGE>


which are  payable  subsequent  to Closing  and relate to leases in force on the
date hereof, including those leasing commissions listed on Schedule C, and Buyer
shall not be obligated to indemnify Seller for  Service/Equipment  Contracts (as
hereinafter defined) which are not assumed by the Buyer at Closing.

     9.  REPRESENTATIONS AND WARRANTIES.  "To the best of Seller's knowledge" or
other   references   herein  to  Seller's   knowledge   means  the  actual  (not
constructive)  knowledge  which  Mike  Duffy and  Vance  Voss  have  based  upon
reasonable  familiarity with the property records and continued involvement with
the Property.  Notwithstanding the foregoing,  the term "to the best of Seller's
knowledge"  shall not be construed to imply any covenant  that such  individuals
have  conducted  any  review of files or other  inquiry in  connection  with the
transaction   contemplated  by  this  Agreement.   Furthermore,   the  foregoing
individuals  are acting in the  capacity  as agents or  employees  of Seller and
shall have no personal liability with respect to any representations, warranties
or covenants of Seller in this Agreement.

          (a) Seller  hereby  represents  and  warrants  to Buyer as of the date
hereof and as of the date of Closing as follows:

               (i) Seller is a corporation  duly organized and validly  existing
under  the laws of the State of Iowa and is in good  standing  under the laws of
the State of Texas.

               (ii) Ownership.

                    (A)  Seller is the owner of the  Property  of record  and in
fact, legally and beneficially,  and to the best of Seller's  knowledge,  Seller
has good, marketable and insurable title to the Property.

                    (B) No person or  entity  other  than  Seller  and  Seller's
affiliates  has any interest in the legal or  beneficial  title to the Property;
there are no options to  purchase  the  Property  which are  effective,  nor has
Seller  previously  entered into any other  contract of sale or agreement of any
kind with a party other than Buyer which is presently  effective  and which will
not be  terminated  before  the date of this  Agreement.  After the date  hereof
Seller will not enter into any agreement or contract or negotiate with any party
other  than  Buyer  with  respect  to the sale of the  Property,  nor enter into
financial  arrangements of any kind with respect to the Property nor will Seller
pledge or assign any right,  title,  interest in or to the  Property or any part
thereof to any person or entity.

               (iii) Leases.

                    (A) As of the date of the  Agreement  there  are no  leases,
subleases,  licenses or other rental agreements or occupancy agreements (written
or verbal) which grant any  possessory  interest in and to any space situated on
or in any of the  Property or that  otherwise  give rights with regard to use of
any  portions  of any of the  Property  other than the Leases  described  in the
Certified  Rent Roll,  as set forth in Exhibit B attached  hereto (said  leases,
together with any and all amendments,  modifications and supplements thereto and
guarantees thereof, are herein referred to collectively as the "Leases");

                    (B) The  copies of the  Leases  provided  to Buyer are true,
accurate  and  complete,  are in full force and effect and none of them has been
modified, amended or extended;

                    (C) There are no security  deposits or other  deposits other
than those listed on Schedule D.

               (iv) Service and  Management  Contracts.  To the best of Seller's
knowledge, except as set forth on Schedule E, neither Seller nor any other party
has entered into any construction,  design, engineering,  service,  maintenance,
supply, brokerage/leasing agreements, employee agreements,  management contracts
or Leases of personal  property  (collectively,  "Service/Equipment  Contracts")
affecting the construction, use, ownership,  maintenance and/or operation of the
Property that will continue  subsequent to the Closing.  Seller shall terminate,
at Seller's sole cost and expense, all  Service/Equipment  Contracts which Buyer
does not elect to assume in writing prior to the expiration of the Study Period.
All work  required  to be  performed  by Seller in  connection  with all Service

                                       9
<PAGE>

Equipment  Contracts or other contracts or requirements  with respect to periods
prior to the date of Closing  has been or will be fully  performed  and that all
such bills in connection with such work will be Seller's responsibility.  Seller
is not in default and to best of Seller's knowledge no other party is in default
under the Service/Equipment Contracts.

               (v) Hazardous Substances.  To the best of Seller's knowledge, (i)
the  Property  has not  been  used for the  generation,  treatment,  storage  or
disposal of any hazardous substances during the period in which Seller has owned
the  Property;  and (ii) there are no  underground  storage  tanks located on or
under  the  Property.  For the  purposes  of this  Section  9(a)(v),  "hazardous
substances" shall include "hazardous substances" as defined in the Comprehensive
Environmental  Response  Compensation and Liability Act of 1980, as amended,  42
U.S.C.  ss.ss.  9601 et. seq., and regulations  adopted pursuant to said Act, or
any similar  environmental  protection law of the state in which the Property is
located or its political subdivisions.

               (vi)  Ability  to  Perform.  Seller  has full  power to  execute,
deliver and carry out the terms and  provisions of this  Agreement and has taken
all necessary  action to authorize the  execution,  delivery and  performance of
this  Agreement,  and this Agreement  constitutes  the legal,  valid and binding
obligation  of  Seller  enforceable  in  accordance  with its  terms.  No order,
permission,   consent,  approval,   license,   authorization,   registration  or
validation  of, or filing  with,  or  exemption  by,  any  governmental  agency,
commission,  board or public authority is required to authorize,  or is required
in connection with, the execution, delivery and performance of this Agreement by
Seller or the taking by Seller of any action contemplated by this Agreement.

     The execution and delivery of this Agreement and the closing  documents and
the consummation of the transactions  contemplated  hereby will not result in or
constitute  any of the following:  (i) a default,  breach,  or violation,  or an
event that, with notice or lapse of time or both, would be a default, breach, or
violation,  of the  organizational  documents of Seller or any of the  following
with  respect to Seller or the  Property:  any  agreements,  contracts,  leases,
promissory  notes,   conditional  sales  contracts,   commitments,   indentures,
mortgages,  deeds of trust, or other agreements,  instruments or arrangements to
which  Seller is a party or by which it or the Property is bound and that relate
to the  Property;  (ii) a violation of or conflict with any term or provision of
any  judgment,  decree,  order,  statute,  injunction,  rule or  regulation of a
governmental  unit  applicable to Seller or the Property;  (iii) the creation or
imposition  of any lien,  charge or  encumbrance  on the  Property;  or (iv) not
require approval, waiver or authorization from a governmental or regulatory body
which has not been obtained.

               (vii)  Compliance  with Laws,  Etc.  Neither the entering into of
this Agreement nor the consummation of the transaction  contemplated hereby will
constitute or result in a violation or breach by Seller of any judgment,  order,
writ,  injunction or decree issued against or imposed upon it, or will result in
a violation of any applicable law, order, rule or regulation of any governmental
authority.   There  are  no  actions,   suits,   proceedings,   arbitrations  or
investigations pending or threatened against, relating to or affecting Seller or
the Property which might  interfere in a material  respect with the  transaction
contemplated by this  Agreement,  become a cloud on the title to the Property or
any portion  thereof or  otherwise  affect the  Property or Seller's  ability to
consummate the transaction contemplated hereby.

               (viii) No  Violation  Notice.  Except as set forth in Schedule F,
Seller has not received
 
notices:

                    (A) from any federal,  state,  county or municipal authority
alleging any fire, health, safety, building, pollution, environmental, zoning or
other  violation  of law  in  respect  of the  Property  or  any  part  thereof,
including, without limitation, the occupancy or operation thereof, which has not
been entirely corrected;

                    (B) concerning the possible or anticipated  condemnation  of
any part of the Property, or the widening,  change of grade or limitation on use
of streets  abutting the same or  concerning  any special  taxes or  assessments
levied or to be levied against the Property or any part thereof;

                    (C)  concerning  any  change in the zoning or other land use
classification of the Property or any part thereof.

                                       10
<PAGE>

                    (D) of any pending insurance claim.

                    (E)  from any  governmental  authority  that  any  licenses,
permits,  certificates,   easements  and  rights  of  way,  including  proof  of
dedication,  required from any authorities having jurisdiction over the Property
or from private  parties for the existing  use,  occupancy  and operation of the
Property and to insure  vehicular and pedestrian  ingress to and egress from the
Property are in violation of any governmental laws or regulations, which has not
been corrected or will not be corrected by Closing.

               (ix)  No  Management  Contracts,  Employment  Contracts,  Unions,
Pension Plans. Seller has not entered into any management contracts,  employment
contracts  or labor union  contracts  and has not  established  any  retirement,
health  insurance,  vacation,  pension,  profit  sharing or other  benefit plans
relating to the operation or  maintenance  of the Property for which Buyer shall
have any liability or obligation. Seller has no employees at the Property, other
than at-will  employees who shall remain the  responsibility of Seller and as to
whom Buyer shall have
                                       11
<PAGE>


no  liability or  obligation  whatsoever.  As of the Closing,  there shall be no
employees  working at the Property.  Seller shall have paid or caused to be paid
to all employees of the Seller all salary and any other  payments which shall be
payable on account of each such employee for such period through Closing. Seller
agrees to defend, indemnify and hold Buyer harmless from any loss, expense, cost
and/or damage (including without limitation reasonable attorneys' fees and costs
incurred in the defense of such claims)  resulting from claims  well-founded  or
unfounded,  by or on behalf of persons who are to have been  employees of Seller
on or prior to the Closing  arising  out of any matter,  cause or thing prior to
the Closing or any claims which may have accrued prior to the Closing.

               (x) Seller has not received any written notice of the termination
or impairment of the furnishing of services to the Property of water, sewer, gas
(if any), electric, telephone, drainage and other such utility services.

               (xi) Assessments. Seller has not received notice that assessments
for public  improvements  have been made against the Property  which are unpaid,
including,  without limitation, those for construction of sewer and water lines,
streets,  sidewalks and curbs. To the best of Seller's  knowledge,  there are no
pending  or  proposed  special  assessments  affecting  or which may  affect the
Property or any portion thereof.

               (xii) Pre-Closing Deliveries Accurate. Except with respect to the
Certified  Rent Roll, to the best of Seller's  knowledge,  all of the documents,
writings and other  matters  delivered by Seller to Buyer  pursuant to Section 4
and information provided to Buyer pursuant to the terms of this Agreement, as of
the date hereof, and as of the Closing,  are true,  accurate and complete in all
material  respects and accurately  indicate all of the  information  referred to
therein,  are not  misleading  in any  respect,  and  none  of such  disclosures
misstated any material facts or omitted to state any material facts necessary to
make the  statements  made, in the light of the  circumstances  under which they
were made, not misleading.  This representation  shall be applicable only to due
diligence items listed on Schedule B and not any delivered thereafter.

               (xiii) Miscellaneous Representations and Warranties.

                    (A) Seller agrees to conduct the business  operations of the
Property in the Seller's usual and normal manner until the Closing. Seller shall
not,  without the prior written consent  thereto of Buyer,  make (or permit) any
physical change in the Property.

                    (B) All bills and claims for labor  performed  and materials
furnished  to or for the benefit of the  Property  for all periods  prior to the
Closing  date  have  been  paid by  Seller  or will be paid by  Seller as of the
Closing.

                    (C) (Intentionally Deleted)

                    (D)  Seller is not a  "foreign  person",  as  defined in the
Internal Revenue Code.

                    (E) The premiums are paid and current for  replacement  cost
insurance  policies on the  Property  and,  to the best of  Seller's  knowledge,
insurance policies are in full force and effect.

               (xiv) All documents  executed by Seller which are to be delivered
to Buyer at the Closing are or at the Closing will be duly authorized,  executed
and delivered by Seller, are or at the Closing will be legal, valid, and binding
obligations of Seller,  are  sufficient to convey title,  and do not violate any
provisions  of any  agreement  to  which  Seller  is a party  or to  which it is
subject.

               (xv) Additional  Representations and Warranties Regarding Parcels
of Land with No Improvements: (Intentionally Deleted)

               (xvi)  Additional  Representation  and Warranties  Regarding Land
Under a Ground Lease: (Intentionally Deleted)

                                       12
<PAGE>

               (xvii)  Additional   Representations  and  Warranties   Regarding
Properties Where Improvements Are Under Construction. (Intentionally Deleted)

               (xviii)  Additional   Representations  and  Warranties  Regarding
Properties With Covenants, Conditions and Restrictions.

                    (A) Seller represents and warrants,  to the best of Seller's
knowledge,  that with regard to the  Declaration  of Covenants,  Conditions  and
Restrictions  dated June 20, 1985 and recorded in Volume  2156,  Page 456 of the
Land Records of Collin County,  Texas,  as amended (the "Summit  Business Center
CCRs"):  (i) the Summit  Business Center is not in default in the performance of
any covenant,  agreement or condition  contained in the Summit  Business  Center
CCRs, and no condition or circumstance  exists which,  with the giving of notice
or the  passage of time,  would  constitute  a default  thereunder;  and (ii) no
assessments,  payments, fees or expenses are presently due and payable under the
Summit Business Center CCRs.

                    (B) Seller represents and warrants,  to the best of Seller's
knowledge,  that with regard to the  Declaration  of Covenants,  Conditions  and
Restrictions  dated September 27, 1982, and recorded in Volume 82189,  Page 3264
of the Land Records of the City of Dallas,  Texas,  as amended  (the  "Northgate
CCRs"),  the Northgate Business Park is not in default in the performance of any
covenant,  agreement  or  condition  contained  in the  Northgate  CCRs,  and no
condition or circumstance exists which, with the giving of notice or the passage
of time,  would  constitute  a  default  thereunder;  and  (ii) no  assessments,
payments,  fees or expenses are  presently  due and payable  under the Northgate
CCRs.

                    (C) Seller represents and warrants,  to the best of Seller's
knowledge,  that with regard to the  Declaration  of Covenants,  Conditions  and
Restrictions  recorded on December 5, 1957 in Volume  4810,  Page 87 of the Land
Records of Dallas County,  Texas, as amended (the "Empire CCRs"): (I) the Empire
Commerce Center is not in default in the performance of any covenant,  agreement
or  condition  contained in the Empire  CCRs,  and no condition or  circumstance
exists which, with the giving of notice or the passage of time, would constitute
a default thereunder;  and (ii) no assessments,  payments,  fees or expenses are
presently due and payable under the Empire CCRs.

                    (D) Seller represents and warrants,  to the best of Seller's
knowledge,  that with regard to the  Declaration  of Covenants,  Conditions  and
Restrictions  shown in the Title Policy,  if any (the "Business  Parkway CCRs"):
(i) the  Business  Parkway  Center is not in default in the  performance  of any
covenant,  agreement or condition contained in the Empire CCRs, and no condition
or circumstance  exists which, with the giving of notice or the passage of time,
would constitute a default thereunder;  and (ii) no assessments,  payments, fees
or expenses are presently due and payable under the Business Parkway CCR.

                    (E)  To  the  best  of  Seller's  knowledge,  Seller  hereby
represents  and warrants  that none of the business  parks  referenced  above in
Sections (A), (B), (C) or (D), in whole or in part, is subject to the terms of a
repurchase  option,  right of first  refusal or other  option to  purchase  such
property ("Purchase Option"), which right has not lapsed, fully and irrevocably,
prior to being exercised by the beneficiary  thereof.  This  representation  and
warranty shall survive for the period of any  applicable  statute of limitations
with regard to such Purchase  Option and shall be null and void in the event any
such action is triggered by an affirmative  action of Buyer (provided,  however,
the foregoing is not intended to mean that the statute of limitations  commences
on the date hereof).

                    (F) Buyer and Seller acknowledge that all setback violations
and  landscaping  violations  with regard to the  Properties,  if any, have been
satisfied by credits at Closing on the Settlement Statement.

          (b) Buyer hereby  represents  and  warrants to Seller as follows:  (i)
Buyer is a California limited  partnership,  duly organized and validly existing
under the laws of the State of California; all documents executed by Buyer which
are to be  delivered  to Seller at Closing  are or at the  Closing  will be duly
authorized,  executed, and delivered by Buyer, and are or at the Closing will be
legal,  valid,  and binding  obligations of Buyer, and do not and at the Closing
will not violate any provisions of any agreement to which Buyer is a party or to
which it is  subject;  and (ii)  Buyer  shall  furnish  all of the funds for the
                                       13
<PAGE>

purchase of the Property  (other than funds  supplied by  institutional  lenders
which will hold valid  mortgage  liens against the Property) and such funds will
not be from sources of funds or properties derived from any unlawful activity.

     10.  RESPONSIBILITY  FOR  VIOLATIONS.  All notices of  violations  of laws,
ordinances,  or regulations  ("Violations of Law"),  which are received prior to
the  Closing  from  any  governmental   department,   agency  or  bureau  having
jurisdiction  as to  conditions  affecting  the  Property  shall be  remedied or
complied  with by Seller.  If any such  violations  are subject to  challenge or
objection by Seller or are the  obligation of any tenant under the terms of such
tenant's  lease,  Buyer shall  cooperate  with  Seller to defend such  challenge
and/or require tenant to cure the violation.  Seller shall  indemnify  Buyer for
the reasonable third party costs of such challenge incurred by Buyer,  including
reasonable attorney's fees. This obligation shall survive Closing on the part of
both parties.

     11. MAINTENANCE OF INSURANCE.  Until the Closing, Seller shall maintain its
present insurance on the Property. The risk of loss in and to the Property shall
remain vested in Seller until the recordation of the Deed to Buyer.

     12. CASUALTY OR CONDEMNATION.  If prior to the Closing, the Property or any
"material"  portion thereof is damaged or destroyed by fire or casualty,  or any
part of the Property is taken or threatened to be taken by eminent domain by any
governmental  entity,  then Buyer shall have the option,  exercisable by written
notice given to Seller at or prior to the Closing,  either to (a) terminate this
Agreement,  whereupon all  obligations  of all parties  hereto shall cease,  the
Deposit shall be returned to Buyer and this Agreement  shall be void and without
recourse to the parties hereto except for provisions  which are expressly stated
to survive such  termination;  or (b) proceed with the purchase of the Property,
and in such case,  unless Seller shall have previously  restored the Property to
its condition prior to the occurrence of any such damage or destruction,  Seller
shall pay over or assign to Buyer, without recourse, all amounts received or due
(plus an amount equal to the sum of any  deductible  under any insurance  policy
covering the Property and any  additional  proceeds  which shall be necessary to
effect such restoration) from, and all claims against,  any insurance company or
governmental entity as a result of such destruction or taking, together with any
additional proceeds which shall be necessary to effect such restoration.  Within
five (5) days after receipt of written notice of such casualty or  condemnation,
Buyer will advise  Seller in writing  whether Buyer desires to proceed with this
transaction in light of such casualty or  condemnation.  The term  "material" as
used in this Section 12 shall mean damage or  destruction  in an amount equal to
or greater than 5% of the Purchase Price.

     13. INDEMNIFICATION.  Each party hereby agrees to indemnify the other party
and hold it harmless from and against any and all claims, demands,  liabilities,
costs, expenses,  penalties,  damages and losses, including, without limitation,
reasonable  attorneys' fees, resulting from any  misrepresentations or breach of
warranty or breach of covenant  made by such party in this  Agreement  or in any
document, certificate, or exhibit given or delivered to the other pursuant to or
in connection with this Agreement except as provided herein.

     14. CONDITION OF PROPERTY.  At or before the Approval Date, Buyer will
have approved the physical and  environmental  characteristics  and condition of
the Property,  as well as the economic  characteristics  of the Property.  Buyer
hereby  waives any and all defects in the physical,  environmental  and economic
characteristics  and condition of the Property  which would be disclosed by such
inspection  which  exist as of the  Approval  Date  except  such waiver does not
extend  to or  negate  the  effect  of any  matters  which  are  covered  by any
representation, warranty or covenant of Seller in Section 9 of this Agreement or
in any of the conveyance  documents,  Buyer further  acknowledges that except as
set forth in this  Agreement,  neither  Seller nor any of  Seller's  officers or
directors, nor Seller's employees, agents, representatives,  or any other person
or  entity  acting  on behalf of  Seller  (hereafter,  for the  purpose  of this
Section, such persons and entities are individually and collectively referred to
as the  "Seller")  have  made  any  representations,  warranties  or  agreements
(express or implied) by or on behalf of Seller as to any matters  concerning the
Property,  the economic results to be obtained or predicted,  or the present use
thereof or the suitability for Buyer's intended use of the Property,  including,
  
                                     14
<PAGE>

without  limitation,   the  following:   suitability  of  the  topography;   the
availability  of water  rights or  utilities;  the  present  and future  zoning,
subdivision  and any and all other land use matters;  the condition of the soil,
subsoil,  or  groundwater;  the  purpose(s)  to which the  Property  is  suited;
drainage;  flooding;  access to public  roads;  or  proposed  routes of roads or
extensions   thereof.   Buyer  acknowledges  and  agrees  that  except  for  the
representations and warranties contained herein and in the conveyance documents,
the Property is to be  purchased,  conveyed and accepted by Buyer in its present
condition,  "as is" and that no  patent  or latent  defect  in the  physical  or
environmental  condition  of the  Property  whether or not known or  discovered,
shall affect the rights of either party  hereto.  Except as set forth in Section
9,  any  documents  furnished  to  Buyer  by  Seller  relating  to the  Property
including, without limitation,  service agreements,  management contracts, maps,
surveys,  studies,  pro formas,  reports and other  information  shall be deemed
furnished as a courtesy to Buyer but without warranty from Seller. All work done
by Buyer in  connection  with  preparing  the Property for the uses  intended by
Buyer including any and all fees, studies, reports,  approvals,  plans, surveys,
permits,  and any expenses whatsoever  necessary or desirable in connection with
Buyer's  acquiring,  developing,  using and/or  operating the Property  shall be
obtained and paid for by, and shall be the sole  responsibility of Buyer.  Buyer
has  investigated and has knowledge of operative or proposed  governmental  land
use laws and  regulations to which the Property may be subject and shall acquire
the Property upon the basis of its review and determination of the applicability
and effect of such laws and regulations.

                    Except for the  representations  and warranties in Section 9
of  this   Agreement,   Buyer  has   neither   received   nor  relied  upon  any
representations concerning such land use laws and regulations from Seller.

                    Except for the  representations,  warranties and indemnities
provided by Seller contained  herein and in the documents  delivered at Closing,
Buyer,  on behalf of itself and its  employees,  agents,  successors and assigns
attorneys and other  representatives,  and each of them,  hereby releases Seller
from and  against any and all claims,  demands,  causes of action,  obligations,
damages  and  liabilities  of any nature  whatsoever,  directly  or  indirectly,
arising out of or related to the condition of the Property.

                    By signing in the space  provided  below in this Section 14,
Buyer  acknowledges  that it has  read and  understood  the  provisions  of this
Section 14.



                                 BUYER:

                                 TPLP OFFICE PARK PROPERTIES
                                 a Texas Limited Partnership

                                 By: AMERICAN OFFICE PARK PROPERTIES,
                                     TPGP, INC. a California Corporation doing
                                     business in Texas under the name
                                     TPGP OFFICE PARK PROPERTIES, INC.

                                     By:
                                        -----------------------------
                                        Ronald L. Havner, Jr.
                                        President

     15. POSSESSION.  Buyer shall have and as a condition  precedent to Closing,
the right of  possession  on the Closing Date,  provided,  however,  that Seller
shall  allow  authorized  representatives  of  Buyer  reasonable  access  to the
Property for the purposes of satisfying  Buyer with respect to  satisfaction  of
any conditions precedent to the Closing contained herein.

     16.  TAX-DEFERRED  EXCHANGE.  Buyer and Seller agree that, at Seller's sole
election,  this  transaction  shall be  structured  as an exchange of  like-kind
properties  under Section 1031 of the Internal  Revenue Code of 1986, as amended
(the "Code"),  and the  regulations  and proposed  regulations  thereunder.  The
parties agree that if Seller wishes to make such  election,  it must do so prior
to the Closing Date. If Seller so elects,  Buyer shall reasonably cooperate with
Seller,  provided any such exchange is consummated pursuant to an agreement that
is  mutually  acceptable  to Buyer and Seller and which  shall be  executed  and
delivered  on or  before  the  Closing  Date.  Seller  shall  in all  events  be
responsible for all costs and expenses  related to the Section 1031 exchange and
shall fully  indemnify,  defend and hold Buyer harmless from and against any and
all liability,  claims,  damages,  expenses (including reasonable attorneys' and
                                       15
<PAGE>

paralegal  fees  and  reasonable  attorneys'  and  paralegal  fees  on  appeal),
proceedings  and causes of action of any kind or nature  whatsoever  arising out
of, connected with or in any manner related to such 1031 exchange that would not
have been  incurred by Buyer if the  transaction  were a purchase for cash.  The
provisions of the immediately  preceding  sentence shall survive closing and the
transfer of title to subject Property to Buyer.  Notwithstanding anything to the
contrary  contained in this  Section,  any such Section 1031  exchange  shall be
consummated through the use of a facilitator or intermediary so that Buyer shall
in no event be requested or required to acquire title to any property other than
the Property.

     17. MISCELLANEOUS.

          (a) Notices.  Any notice  required or permitted to be given under this
Agreement shall be in writing and addressed as follows:

                    If to Seller:

                    Principal Mutual Life Insurance Company
                    c/o Law Department
                    711 High Street
                    Des Moines, Iowa  50392-0301
                    Attn:  Dennis D. Ballard

                    With a copy to:

                    Principal Mutual Life Insurance Company
                    c/o CRE-Equities
                    711 High Street
                    Des Moines, Iowa  50392-1370
                    Attn:  Michael S. Duffy


                                       16
<PAGE>


                    If to Buyer:

                    TPLP Office Park Properties
                    701 Western Ave., Suite 200
                    Glendale, CA 91201
                    Attention:  Ronald L. Havner, Jr.

                    with a copy to:

                    TPLP Office Park Properties
                    701 Western Avenue, Suite 200
                    Glendale, California 91201
                    Attention:  David Goldberg, Esq., General Counsel

                    and a courtesy copy which shall not be required for valid 
                    notice to:

                    Hale and Dorr LLP
                    1455 Pennsylvania Avenue, N.W.
                    Washington, D.C. 20004
                    Attention:  Steven S. Snider, Esq.

Unless otherwise specified herein, such notices or other communications shall be
deemed to be effective:  (i) one (1) business day after deposit with the courier
if sent by Federal Express or other recognized  overnight  delivery service;  or
(ii) upon receipt if  accomplished  by hand delivery or by confirmed  telecopied
delivery.  Either party may, from time to time, by notice in writing served upon
the other party,  in the same manner as prescribed  in this Section  designate a
different  mailing  address or a different  person to which all such notices are
thereafter to be addressed.

          (b) Brokers and Finders. Neither party has had any contact or dealings
regarding  the Property,  or any  communication  in connection  with the subject
matter of this  transaction,  through any licensed real estate  broker,  entity,
agent,  commission  salesperson,  or  other  person  who  will  claim a right to
compensation  or a commission  or finder's fee as a procuring  cause of the sale
contemplated herein,  except for Chadwick,  Saylor & Co., Inc., whose commission
shall be paid by Buyer.  In the event that any  company,  firm,  broker,  agent,
commission  salesperson or finder  perfects a claim for a commission or finder's
fee based upon any such contract,  dealings or communication,  the party through
whom the company,  firm, broker, agent,  commission  salesperson or finder makes
his claim  shall be  responsible  for said  commission  or fee and all costs and
expenses (including  reasonable  attorneys' fees) incurred by the other party in
defending against the same. No commission shall be paid or become payable unless
the Closing actually occurs. The provisions of this Subsection (b) shall survive
Closing and any termination, cancellation or recision of this Agreement.

          (c) Successors and Assigns.  This Agreement shall be binding upon, and
inure to the  benefit of, the parties  hereto and their  respective  successors,
heirs,  administrators and assigns;  provided further, however, Seller's consent
to an assignment of Buyer's rights and delegation of its  obligations  hereunder
shall not be required with respect to an  assignment of this  Agreement by Buyer
to any person or any  corporation,  general  partnership,  limited  partnership,
limited liability company or other lawful entity which is controlled by or under
common control with Buyer.

          (d) Amendments and Terminations.  Except as otherwise provided herein,
this Agreement may be amended or modified by, and only by, a written  instrument
executed by Seller and Buyer.

          (e) Governing Law. This  Agreement  shall be governed by and construed
in accordance with the laws of the State of Texas.

          (f) Merger of Prior  Agreements.  This Agreement  supersedes all prior
agreements and understandings between the parties hereto relating to the subject
matter hereof.
  
                                     17
<PAGE>

          (g) Enforcement. In the event either party hereto fails to perform any
of its  obligations  under  this  Agreement  or in the  event a  dispute  arises
concerning the meaning or interpretation of any provision of this Agreement, the
defaulting  party or the party not  prevailing in such dispute,  as the case may
be,  shall pay any and all costs and  expenses  incurred  by the other  party in
enforcing or establishing its rights hereunder,  including,  without limitation,
court costs and reasonable  attorneys'  fees.  Buyer and Seller both acknowledge
each has been  advised  by  counsel as to their  respective  rights,  duties and
obligations in this Agreement and have had ample  opportunity to negotiate same.
Thus,  both Buyer and Seller  acknowledge  that any ambiguity in this  Agreement
should not necessarily be resolved against the drafter of this Agreement.

          (h) Time of the Essence. Time is of the essence of this Agreement.

          (i) Counterparts. This Agreement may be executed in counterparts, each
of which shall be deemed to be an  original,  but such  counterparts  when taken
together shall constitute but one Agreement.

          (j) Survivability.  Except as otherwise provided herein, the covenants
contained in this  Agreement  shall survive the closing of the purchase and sale
and shall not be deemed  merged in the deed,  but shall remain in full force and
effect.

          (k) No  Recordation.  Neither  Seller  nor  Buyer  shall  record  this
Agreement or memorandum  thereof in or among the land or chattel  records of any
jurisdiction.

          (l)  Proper  Execution.  The  submission  by  Seller  to Buyer of this
Agreement  in unsigned  form shall have no binding  force and effect,  shall not
constitute  an option,  and shall not confer any rights upon Buyer or impose any
obligations on Seller  irrespective of any reliance thereon,  change of position
or partial  performance  until Seller shall have executed this Agreement and the
Deposit  shall have been  received  by the Title  Company.  Notwithstanding  the
foregoing  sentence,  Seller's  submission to Buyer of this  Agreement  shall be
deemed withdrawn,  revoked and incapable of being executed by Buyer in the event
Buyer has not returned a duly executed original Agreement to Seller on or before
5:00 p.m. on April 30, 1998.

          (m) Personal  Liability.  There shall be no personal liability imposed
on the individuals who have executed this Agreement (or the attached exhibits)

          (n)  Survival  of   Representations.   Except  as  expressly  provided
otherwise in this  Agreement,  all  representations  and warranties  made by the
parties herein or in any instrument or document furnished in connection herewith
(except  warranties of title in the  conveyance  documents)  shall survive for a
period of one (1) year from the date of Closing and any action  thereon  must be
commenced  within such period or they are deemed waived and released;  provided,
however,  Representation  9(a)(iii)  regarding  leases  shall  survive  for  the
remaining term of any lease (excluding renewals) for which Buyer did not receive
a tenant estoppel executed prior to Closing;  however, to the extent that tenant
estoppels are obtained post closing,  the survival  period for such leases shall
be one (1) year from the date of Closing.

          (o) Dates.  Whenever used herein, unless expressly provided otherwise,
the term  "days"  shall  mean  consecutive  calendar  days,  except  that if the
expiration  of any time period  measured  in days occurs on a Saturday,  Sunday,
legal holiday or other day when federal offices are closed in Washington,  D.C.,
such expiration shall automatically be extended to the next business day.

          (p) Prior to the Closing,  information received in connection with the
Property shall be kept strictly  confidential  and shall not,  without the prior
consent of the other  party,  be  disclosed  by such other party or used for any
purpose  other than  evaluating  the Property  except in the event of litigation
between the parties hereto,  Buyer and Seller agree that such information  shall
only be  transmitted  to Buyer's and Seller's  respective  officers,  directors,
trustees, employees, attorneys, accountants,  contractors, consultants, advisors
and agents who need to know such  information  for  purposes of  evaluating  the
Property and transactions  contemplated under this Agreement.  The provisions of
this  Section  17(p)  shall  not apply to any  information  which is a matter of
public  record or  obtainable  from other  sources and shall not prevent  either
Buyer or Seller from complying with laws,  rules,  regulations and court orders,
including,  without limitation,  governmental  regulatory,  disclosure,  tax and
reporting requirements.

                                       18

<PAGE>

     18. ESCROW AGENT. (Intentionally Deleted)

     19. SELLER'S ADDITIONAL  AGREEMENTS RELATED TO PROPERTIES WITH IMPROVEMENTS
UNDER CONSTRUCTION. (Intentionally Deleted)


                                       19
<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first above written.

                                  SELLER:
                                  -------

                                  PRINCIPAL MUTUAL LIFE INSURANCE
                                  COMPANY, an Iowa corporation


                                  By:  /s/ Jon C. Heiny
                                     -------------------------
                                           Jon C. Heiny
                                  Its: Counsel


                                  By:  /s/ Shannon G. Holz
                                     -------------------------
                                           Shannon G. Holz
                                  Its: Counsel

                                  BUYER:
                                  ------

                                       TPLP OFFICE PARK PROPERTIES
                                       a Texas Limited Partnership

                                  By:  AMERICAN OFFICE PARK PROPERTIES,
                                       TPGP, INC. a California Corporation doing
                                       business in Texas under the name
                                       TPGP OFFICE PARK PROPERTIES, INC.
 
                                       By:/s/ Ronald L. Havner, Jr.
                                          ------------------------------
                                          Ronald L. Havner, Jr.
                                          President

                                          Buyer's Social Security Number or Tax
                                          Identification Number:95-4609260




                                       20

                                                                    Exhibit 10.4

                     REAL ESTATE PURCHASE AND SALE AGREEMENT


                                 by and between

                             PETULA ASSOCIATES, LTD.
                                     SELLER



                                       and



                          TPLP OFFICE PARK PROPERTIES,
                           a Texas Limited Partnership
                                      BUYER




    Exhibits to this Agreement have been omitted and will be furnished to the
                Securities and Exchange Commission upon Request







<PAGE>

                                    INDEX TO

                     REAL ESTATE PURCHASE AND SALE AGREEMENT





1. Property Included in Sale...............................................1


2. Purchase Price/Remedies.................................................2


3. Title to the Property...................................................2


4. Seller's Pre-Closing Deliveries.........................................3


5. Buyer's Due Diligence...................................................4


6. Buyer's Conditions to Closing...........................................5


7. Seller's Conditions to Closing..........................................5


8. The Closing.............................................................5


9. Representations and Warranties..........................................10


10. Responsibility for Violations..........................................15


11. Maintenance of Insurance...............................................16


12. Casualty or Condemnation...............................................16


13. Indemnification........................................................16


14. Condition of Property..................................................16


15. Possession.............................................................17
 
                                      2
<PAGE>

16. Tax-Deferred Exchange..................................................17


17. Miscellaneous..........................................................18


18. Escrow Agent...........................................................22


<PAGE>

                     REAL ESTATE PURCHASE AND SALE AGREEMENT


     THIS REAL ESTATE  PURCHASE AND SALE AGREEMENT (the  "Agreement") is made as
of the 30th day of April, 1998 (the "Agreement Date") which shall be the later
to occur of execution of this Agreement by Buyer or Seller by and between PETULA
ASSOCIATES, LTD., an Iowa corporation,  herein referred to as "Seller", and TPLP
OFFICE PARK  PROPERTIES,  a Texas  limited  partnership,  herein  referred to as
"Buyer."

                                R E C I T A L S:

     WHEREAS,  Seller  desires to sell  certain  improved  and  unimproved  real
property along with certain related personal and intangible property,  and Buyer
desires to purchase said real, personal and intangible property on the terms and
conditions set forth herein;

     NOW,   THEREFORE,   in  consideration  of  the  foregoing  and  the  mutual
undertakings  set forth  herein,  and for good and valuable  consideration,  the
receipt and  sufficiency of which is hereby  acknowledged,  the Buyer and Seller
hereby agree as follows:

     1.  PROPERTY  INCLUDED IN SALE.  Seller hereby agrees to sell and convey to
Buyer,  and Buyer hereby agrees to purchase  from Seller,  at the price and upon
the terms and conditions set forth in this Agreement, the following:

          (a) that certain real property more particularly  described in Exhibit
A attached hereto (the "Real Property");

          (b) all right, title and interest of Seller in all rights, privileges,
alleys,  strips and gores,  rights of way and easements  appurtenant to the Real
Property,  including,  without  limitation,  all  minerals,  oil,  gas and other
hydrocarbon  substances as well as all development  rights,  air rights,  water,
water rights (and water  stock,  if any)  relating to the Real  Property and any
easements,  rights-of-way  or other  appurtenances  used in connection  with the
beneficial use and enjoyment of the Real Property;

          (c) all  improvements  and  fixtures  located  on the  Real  Property,
including all buildings and  structures  presently  located on the Real Property
listed on  Schedule A, as more  particularly  described  in Exhibit A,  attached
hereto,  and all related  facilities,  amenities,  all apparatus,  equipment and
appliances  used in  connection  with the  operation  or  occupancy  of the Real
Property,  such as heating and air  conditioning  systems and facilities used to
provide any utility  services,  refrigeration,  ventilation,  garbage  disposal,
recreation or other services on the Real Property (all of which are collectively
referred to as the "Improvements");

          (d) all tangible or intangible  personal  property owned by Seller and
used  in  the  ownership,   use  or  operation  of  the  Real  Property   and/or
Improvements, including, without limitation, the right to use any trade name now
used in  connection  with the Real Property (the  "Personal  Property")  and any
contract or lease rights, agreements, utility contracts or other rights relating
to the ownership, use and operation of the Real Property.

          (e) all of Seller's interest as lessor in all leases covering the Real
Property and Improvements,  including all tenant security and other deposits and
interest earned thereon and prepaid rent and interest  earned thereon.  Interest
on deposits and prepaid rents shall only be  transferred  to Buyer if applicable
state  law or  the  applicable  lease  requires  that  such  funds  be  held  in
interest-bearing accounts.

          All of the items referred to in Subsections (a), (b), (c), (d) and (e)
above are hereinafter collectively referred to as the "Property."


<PAGE>

     2. PURCHASE PRICE/REMEDIES.

          (a) The total purchase  price (the "Purchase  Price") for the Property
is Fifty-seven  Million Five Hundred Forty-one  Thousand One Hundred  Eighty-One
and  No/100  Dollars  ($57,541,181.00).  The  Purchase  Price is payable by wire
transfer of  immediately  available  funds in U.S.  dollars via the federal bank
wire  transfer  system  to  Chicago  Title  Insurance  Company,  San  Francisco,
California ("the "Title Company") at Closing.

          (b) (Intentionally Deleted)

          (c) (Intentionally Deleted)

          (d) (Intentionally Deleted)

          (e) (Intentionally Deleted)

          (f) (Intentionally Deleted)

     3. TITLE TO THE PROPERTY.

          (a) At the  Closing,  Seller  shall  convey to Buyer  and Buyer  shall
accept  title to the  Property  (either in fee simple or a  leasehold  estate as
specified in Schedule A) in  accordance  with the terms of this  Agreement,  and
Buyer's  obligation  to accept said title shall be  conditioned  upon Buyer then
being conveyed good and clear record,  marketable and insurable title (either in
fee  simple  or a  leasehold  estate as  specified  in  Schedule  A) to the Real
Property,  all rights,  privileges and easements appurtenant thereto, and to the
Improvements,  by duly  executed and  acknowledged  special  warranty deed or an
assignment and assumption of the leasehold  estate, as the case may be. It shall
be a condition precedent to Buyer's obligation to close hereunder that the Title
Company stands ready to issue, at the Closing a TLTA standard full coverage form
Owner's Policy of Title  Insurance with extended  coverage and all  endorsements
reasonably requested by Buyer, insuring Buyer's interest in the Property,  dated
the date of Closing, with liability in the amount of the Purchase Price, subject
only to the Permitted  Exceptions (the "Title  Policy").  The Title Policy shall
insure  against all  mechanics'  liens and shall have full survey  coverage  and
shall be an extended  coverage  policy  insuring  against,  among other  things,
mechanics' liens, easements and claims of parties in possession not shown by the
public records with all general and standard  exceptions  deleted.  Seller shall
pay the cost of the standard  owner's  policy.  Buyer shall bear the expense for
extended coverage and the cost of any endorsements requested by Buyer.

          (b) Buyer  shall,  prior to the  Approval  Date,  provide  Seller with
Buyer's  objections to any matters disclosed by the Commitment,  Title Documents
or Survey.  All matters shown on the Title  Exceptions which are not objected to
by Buyer prior to the  Approval  Date shall be  "Permitted  Exceptions".  Seller
agrees  to use its best  efforts  to  satisfy  such  objections  noted by Buyer,
provided that:  (i) Seller shall obtain a satisfaction  and release or bond over
any monetary liens,  in a manner  reasonably  satisfactory to Buyer,  including,
without limitation,  any and all mortgages,  mechanics' liens and judgment liens
(collectively,  "Monetary  Liens");  and (ii) Seller  shall not be  obligated to
litigate or spend more than  $10,000.00  in the  aggregate to cure  non-monetary
lien  title  objections  or to seek any cure  which  cannot be  obtained  within
fifteen (15) days.  Seller shall  notify Buyer of Seller's  proposed  actions to
satisfy such  objections,  and shall have up to the Closing Date to satisfy such
objections  and the Closing Date shall be extended a reasonable  period of time,
not to exceed  fifteen (15) days,  if  necessary to allow such cure period.  If,
despite its best efforts to do so, Seller cannot satisfy such objections  (other
than the Monetary  Liens,  which shall be satisfied or bonded over by Seller) on
or before the expiration of such additional fifteen (15) day period, Buyer shall
have the option to waive its  objection(s)  to such title and/or other defect(s)
and proceed to Closing or terminate this  transaction.  Buyer  acknowledges that
the  termination  of the  transaction  pursuant to this section of the Agreement
shall not entitle Buyer to receive  reimbursement for third party expenses or to
seek specific performance or any other legal or equitable remedy against Seller
                                       2
<PAGE>

     4. SELLER'S PRE-CLOSING DELIVERIES.

          Buyer  acknowledges  that prior to execution of this Agreement  Seller
has  delivered  the items listed in Schedule B for Buyer's  review and approval.
Seller shall be under no further obligation to deliver additional items to Buyer
unless Buyer requests such items prior to the Approval Date and such  additional
items are reasonably  necessary to complete Buyer's due diligence.  Seller shall
only be obligated to provide such  additional  items if: (i) the items requested
are in Seller's or Seller's  property  manager's  actual  possession or control;
(ii) the items are not  privileged;  and (iii) Buyer has identified the specific
property for which the item is requested.


                                       3
<PAGE>


     5. BUYER'S DUE  DILIGENCE.  Buyer shall be allowed to conduct the following
due diligence prior to purchasing
the Property:

          (a) Review and approve title to the Property as shown on a preliminary
title report (the "Title Report") from the Title Company.

          (b) Review and approve the  operating  statements  of the Property for
the previous two (2) calendar years as well as the current calendar year-to-date
and audited  financial  statements for 1997,  provided same are available and in
Seller's actual possession.

          (c) Review and approve true, correct and complete copies of all tenant
leases  relating to the Property and a certified rent roll of even date herewith
in the form attached hereto as Exhibit B, (the "Certified Rent Roll").

          (d) Review and approve copies of any site plans and building  drawings
and specifications,  existing  environmental  reports,  construction  contracts,
design  agreements  and land purchase  contracts  currently in the possession or
control of the Seller.

          (e)  Review  and  approve  copies  of  any   maintenance  and  service
agreements currently in force.

          (f) Review and approve an as-built  survey showing the location of all
improvements and recorded easements on the Property.

          (g) Performance of a feasibility study of the Property, including, but
not  limited  to,  review  and  approval  of  the  physical  and   environmental
characteristics  and condition of the Property and  performance of marketing and
feasibility  studies,  structural and  engineering  investigations,  auditing of
books and  records of the  Property,  financial  analyses  and  verification  of
existing   zoning..   Seller   agrees  to  provide  Buyer  and  its  agents  and
representatives  reasonable  access to the Property  and to all books,  records,
files,  financial  data,  leases and  contracts  relating to the Property and to
reasonably  cooperate in such  examinations and to cause the property manager to
reasonably  cooperate in such examinations  following the Agreement Date for the
purpose of performing,  at Buyer's sole cost and expense,  the  above-referenced
studies,  physical  inspections,  investigations  and tests on the Property (the
"Tests") provided that no such tests shall be conducted without at least two (2)
business days prior written  notice to Seller and if any such tests are invasive
Seller's prior approval of such Tests,  which approval shall be in Seller's sole
and absolute discretion.  Notwithstanding anything herein to the contrary, Buyer
shall  not need  Seller's  further  consent  to  conduct  Phase I  environmental
studies. Buyer's access is further conditioned on Buyer complying with the terms
of the Access and Indemnification  Agreement attached hereto as Exhibit E. Buyer
shall be  required  to  conduct  such  Tests in a manner  as to not  disturb  or
interfere  with the  current use of the  Property  and upon  completion  of such
Tests, Buyer agrees at its sole cost to restore the Property to the condition it
was in immediately prior to such Tests, including, but not limited to the prompt
removal of anything placed on the Property in connection with such Tests. Copies
of any third party reports,  letters or other written information generated as a
result of such Tests  shall be provided  to Seller if the sale  contemplated  by
this Agreement does not close for any reason other than Seller's default.  Buyer
shall  indemnify,  defend  (with  counsel  reasonably  satisfactory  to Seller),
protect, and hold Seller harmless from and against any and all liability,  loss,
cost, damage, or expense (including,  without limitation,  reasonable attorney's
fees and costs) which Seller may sustain or incur by reason of or in  connection
with any Tests made by Buyer or Buyer's agents or contractors  relating to or in
connection  with the Property,  or entries by Buyer or its agents or contractors
onto  the  Property.  Notwithstanding  any  provision  to the  contrary  in this
Agreement, the indemnity obligations of Buyer under this Agreement shall survive
any  termination  of this Agreement or the delivery of the deed and the transfer
of title pursuant to this Agreement.

               The items  referred to above in  Subsections  5(a)-(g)  and those
listed on Schedule B shall be  collectively  referred  to as the "Due  Diligence
Items." Buyer acknowledges that Seller has provided Buyer with the Due Diligence
Items prior to execution of this Agreement.

                                       4
<PAGE>

               The date this  Agreement is executed by both parties shall be the
"Approval Date" and upon such execution there shall be a conclusive  presumption
that  Buyer  has  approved  the  Due  Diligence   Items  and  the  physical  and
environmental  condition of the Property.  Notwithstanding the foregoing,  Buyer
shall be entitled to rely upon the  representations and warranties of Seller set
forth in this Agreement.

     6. BUYER'S CONDITIONS TO CLOSING.  The following  conditions are conditions
precedent to Buyer's obligation to purchase the Property:

          (a)  Seller  shall  conduct  business  at the  Property  in a good and
diligent manner  consistent with Seller's current  business  practices and shall
maintain  the  Property  in its present  condition  through the date of Closing,
reasonable wear and tear excepted.

          (b) Seller have  terminated,  at Seller's  sole cost and expense,  all
Service/Equipment  Contracts except to the extent Buyer has given Seller written
notice that certain  Service/Equipment  contracts  should be continued and Buyer
has assumed post Closing  liability for such contracts,  however,  such services
shall be continued at Seller's expense until the Closing Date.

          (c) The Title  Company  shall stand ready to issue the Title Policy in
the form required herein.

          (d) Delivery by Seller at Closing of the Closing  Documents  described
in Section 8 hereof.

          (e)  Performance  by Seller as and when required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Seller  pursuant to this  Agreement and all of Seller's  representations  and
warranties  contained in this  Agreement  shall be true and correct on and as of
the Closing Date as if made anew on that date.

          (f)  Delivery by Seller of Tenant  Estoppel  Certificates  in the form
attached  hereto as  Exhibit F for  tenants  comprising  at least 80% of the net
rentable  square feet of the Property  which shall include all tenants listed in
Exhibit F-1, the  substance  and content of which shall be  consistent  with the
Certified  Rent Roll and Seller  shall use  commercially  reasonable  efforts to
obtain the required  Tenant  Estoppel  Certificates.  Buyer shall cooperate with
Seller post Closing to complete  collection  of Tenant  Estoppels.  In the event
sufficient  Tenant  Estoppels  cannot be  obtained,  Buyer shall accept a Seller
Estoppel in the form attached  hereto as Exhibit F-2 and all post Closing Tenant
Estoppels shall be delivered  pursuant to the terms of Exhibit F-2. In the event
that the  conditions  set forth above in this Section 6 are not  satisfied  (and
Buyer is not  otherwise  in  default  of this  Agreement),  Buyer  may  elect to
terminate this Agreement or waive satisfaction of the condition and close escrow
in either instance by giving written notice to Seller.

     7. SELLER'S CONDITIONS TO CLOSING.  The following conditions are conditions
precedent to Seller's obligation to
sell the Property:

          (a)  Delivery  by Buyer  at  Closing  of the  Purchase  Price  and the
executed  Assignment  and  Assumption of Leases in the form  attached  hereto as
Exhibit G.

          (b)  Performance  by Buyer as and when  required by this  Agreement of
each and every term, covenant,  condition and agreement required to be performed
by Buyer pursuant to this Agreement.

               In the  event  that  the  conditions  in this  Section  7 are not
satisfied, Seller may elect, at its sole discretion, to terminate this Agreement
or waive satisfaction of the condition and close escrow.

     8. THE CLOSING.

                                       5
<PAGE>

          (a) The Closing  hereunder  shall be held and delivery of all items to
be made at the Closing  under the terms of this  Agreement  shall be made at the
offices of the Title Company on April 30, 1998, or such other date prior thereto
as Buyer and Seller may mutually  agree in writing (the  "Closing  Date").  Such
date may not be extended  without the prior written  approval of both Seller and
Buyer.  In the event the Closing  does not occur on or before the Closing  Date,
the Title Company  shall,  subject to the provisions of Section 2, and unless it
is  notified  by both  parties to the  contrary,  within five (5) days after the
Closing  Date,  return  to the  depositor  thereof  items  which  may have  been
deposited  pursuant  to this  Agreement.  Any such  return  shall not,  however,
relieve  either  party  hereto  of any  liability  it may have for its  wrongful
failure to close. The delivery to the Escrow Agent of the Closing Documents,  as
hereinafter  defined,  by both parties and the Purchase  Price by Buyer shall be
deemed sufficient to effect a closing under Section 8(a).

          (b) At or before  the  Closing,  Seller  shall  deliver  to escrow the
following (collectively, the "Closing Documents"):

               (i) special  warranty  deed or an  assignment  and  assumption of
leasehold estate, as applicable, conveying to the Buyer the Property as required
by Section 3 above in the form attached hereto as Exhibit I or Exhibit I-1;

               (ii) originals or, if Seller does not have  originals,  certified
true, complete and correct copies of all leases (and amendments thereto, if any)
in Seller's actual and physical possession covering any portion of the Property,
any  security  deposits  relating  thereto,   and  an  executed  Assignment  and
Assumption of Lease in the form attached hereto as Exhibit G;

               (iii) a Bill of Sale, in the form attached hereto as Exhibit J;

               (iv) a  certificate  by  Seller  to the  effect  that  all of the
representations,  warranties  and covenants set forth in this  Agreement  remain
true, correct and complete as of the Closing Date;

               (v) a Certified Rent Roll in the form attached  hereto as Exhibit
B, dated as of the date of Closing Date  consistent  with prior  Certified  Rent
Rolls and Tenant Estoppel Certificates;

               (vi)  such  title   affidavits  or  other  documents  as  may  be
reasonably required by the Title Company with copies thereof to the Buyer;

               (vii) all rent records and related documents in the possession or
under the  control of Seller.  Such  records  may include a schedule of all cash
deposits  and a check  or  credit  to  Buyer  in the  amount  of such  deposits,
including any interest  thereon (to the extent that applicable  state law or the
applicable lease requires payment of interest on such amounts) held by Seller at
the Closing under the Lease. To the extent any deposits are in a form other than
cash, such deposits shall be transferred to Buyer at Closing without recourse.

               (viii) To the extent in Seller's possession or control, originals
or copies of all current site plans, surveys,  architectural drawings, plans and
specifications,  engineering  plans and  studies,  floor  plans,  soil  reports,
environmental  studies,  and  landscape  plans.  To the extent such items are in
Seller's  possession  or control,  Seller shall also deliver (i)  originals  (or
copies,  if originals are not then  available) of all then effective  assignable
guaranties,  warranties and/or payments and performance bonds made by any person
for the benefit of Seller with respect to the Property of any of its components,
together with an instrument  assigning  such  guaranties and warranties to Buyer
and (ii)  originals  (or copies,  if originals  are not then  available)  of all
certificates,  Licenses, permits authorizations and approvals issued for or with
respect to the  Property  by  governmental  and  quasi-governmental  authorities
having  jurisdiction,  to the extent  such items are in Seller's  possession  or
control.


                                       6
<PAGE>


               (ix) to the extent available,  originals (or copies, if originals
are not  available)  of all  documents  and books and records  necessary for the
continued operation of the Project,  including without  limitation,  rent rolls,
lease files,  rent records,  escalation  records and statements and  maintenance
records;

               (x) an original resolution of Seller authorizing the execution of
this Agreement,  the conveyance documents and all other documents to be executed
by Seller and the performance by Seller hereunder;

               (xi) Seller's  Non-Foreign  Certification in the form attached as
Exhibit C; and

               (xii) notices to the tenants at the Property in the form attached
as Exhibit D,  executed by Seller  informing  them of the change in ownership of
the Property.

                    (xiii) an executed Assignment of Warranties,  Guaranties and
Service Contracts in the form attached hereto as Exhibit O.

               Buyer may waive  compliance  on  Seller's  part  under any of the
foregoing items by an instrument in writing.

          (c) At or before  the  Closing,  Buyer  shall  deliver  to escrow  the
Purchase  Price,  as adjusted for  prorations,  and an executed  Assignment  and
Assumption of Leases in the form attached hereto as Exhibit G, and if applicable
an Assignment and Assumption of Leasehold Estate in the form of Exhibit I-1.

          (d) Seller and Buyer shall each deposit such other  instruments as are
reasonably  required by the escrow holder to close the escrow and consummate the
purchase of the Property in accordance with the terms hereof.

          (e) The following items shall be prorated separately for each property
identified on Schedule A as of 11:59 p.m. on the date immediately  preceding the
Closing Date and the net amount  thereof shall be added to or deducted  from, as
the case may be, the amount of the Purchase Price to be paid at the Closing:

               (i) general real estate,  personal  property and ad valorem taxes
and assessments  for the current tax year of the Property.  If any such taxes or
assessments  are  payable in  installments,  all  installments  due  through the
Closing  together with the accrued but unpaid portion of any other  installments
not yet due as of the Closing shall be paid for by the Seller;

               (ii) taxes,  water,  sewer and front foot  benefit  charges,  and
charges for electricity, gas, telephone and other utilities and license fees;


                                       7
<PAGE>


               (iii)  rent and other  charges  under the  Leases  (to the extent
monies have actually been collected therefor), including any free rent under any
of the  Leases;  Buyer  shall  receive a credit at Closing  for any free rent or
other tenant concessions due under any Lease subsequent to Closing;

               (v) all other income and expenses relating to the Property;

               (vi)  any  other   items  that  are   customarily   prorated   in
transactions  of this  nature;  and  (vii) any and all cash  security  deposits,
prepaid rent and all interest  earned thereon (to the extent interest is payable
to tenant under applicable state law or the applicable  lease) shall be a credit
to Buyer at  Closing.  Seller  shall be fully  liable  for any  wages  and other
amounts due and owing any employees at the Property which have accrued up to the
date of  Closing.  Seller  shall  retain and Buyer  shall not be entitled to any
credit  for,  the  deposits,  if any,  made by  Seller  in  connection  with the
provision of electric, sewer, water, telephone and other utility services to the
Property.

     For  purposes  of  calculating  prorations,  Buyer shall be deemed to be in
title to the  Property,  and,  therefore,  entitled to the income  therefrom and
responsible  for the expenses  thereof for the entire day upon which the Closing
occurs.  All such prorations  shall be made on the basis of the actual number of
days of the month  which  shall have  elapsed as of the date of the  Closing and
based upon the actual number of days in the month and a three hundred sixty-five
(365) day year. The amount of such  prorations  shall  initially be performed by
Seller and  mutually  agreed to by the parties  prior to  Closing,  but shall be
subject to  adjustment  in cash after the Closing  outside of escrow as and when
complete and accurate information becomes available,  if such information is not
available at the Closing. Seller and Buyer agree to cooperate and use their best
efforts to make such adjustments no later than sixty (60) days after the Closing
(except with  respect to property  taxes,  which shall be adjusted  within sixty
(60) days after the tax bills for the applicable period are received).

     Buyer shall,  post Closing  based on April 30, 1998  receivables,  purchase
accounts receivable relating to the Property from Seller at a price equal to the
following percentage of such outstanding accounts receivable:

      100% of the amount of accounts receivable less than 31 days old; and
            0% of the amount of accounts receivable over 30 days old;

     The term  "Rent"  as used  herein  shall  mean  all  rents,  including  any
percentage rent and any accrued tax and operating  expense  escalation,  charges
and other revenue of any kind generated  from or in connection  with the Leases.
Except as set forth in this Section  8(e)(vii),  all items of income and expense
which  accrue for the period  prior to the  Closing  will be for the  account of
Seller and all items of income and  expense  which  accrue for the period on and
after the Closing

                                       8
<PAGE>


will be for the  account of Buyer.  Buyer  shall  receive a credit  against  the
Purchase  Price for all amounts of Rent which are allocable to the period on and
after the Closing and which have accrued as of the Closing Date, including those
Rents which have accrued but remain  uncollected as of the date of Closing.  The
provisions of this Section 8(e)(vii) shall survive the Closing.

               (viii)  With  respect  to  expenses  of the  Property  which  are
chargeable  to the tenants  pursuant to the  provisions  of the Leases (the "CAM
Charges"),  Seller  shall  determine  (1) the amount of those  expenses  paid or
payable by Seller from January 1 in the year in which the Closing occurs through
the date of Closing or, with regard to taxes and assessments,  the amount of the
proration  thereof  charged to Seller and (2) the  amount  tenants  have paid to
Seller  from  January 1 in the year in which  Closing  occurs  until the date of
Closing as the  tenants'  pro rata share of such  tenant  expenses.  If accurate
allocations of CAM Charges,  accounts  receivable or any other property expenses
cannot be made at Closing because current bills are not obtainable,  the parties
shall allocate such expenses at Closing on the best and most current information
available,  subject to adjustment in cash as soon as reasonably  possible  after
the Closing when final bills or other  evidence of the  applicable  expenses are
received,  but such adjustment  shall be made no later than six (6) months after
the Closing  Date.  Buyer shall also be entitled to a credit at Closing equal to
any CAM  Charges  for 1997 and prior years which are owing to any of the tenants
of the Property.  The  provisions of this Section  8(e)(viii)  shall survive the
Closing.

               (ix) Those items described in the Settlement  Statement  executed
by the parties hereto of even date herewith.

          (f) The costs  incurred  in this  transaction  shall be  allocated  as
follows:

               (i) Seller shall pay standard  rates for the Title Policy.  Buyer
shall pay for any title endorsements and extended coverage.

               (ii) Buyer shall pay the cost of any recording fees applicable to
the sale.

               (iii) Buyer shall pay the cost of the updated survey.

               (iv) Each party shall pay its own legal fees and expenses and 50%
of all escrow charges.

               (v) Seller shall pay all costs  associated  with the Tax Deferred
Exchange (as described in Section 16 hereof).

          (g) As additional  consideration  for Buyer's  purchasing the Property
and paying the Purchase Price to the Seller,  Seller hereby covenants and agrees
to  remain  fully  liable  for  the   performance  and  payment  of  all  tenant
improvements and the payment of all leasing commissions  currently due and owing
(including  any  delinquent  amounts)  under  any of the  Leases  and  under any
leasing/commission  agreement  up to the Closing  Date except for amounts  which
shall  hereafter  be due  and  owing  under  any  of the  Leases  or  under  any
leasing/commission agreement, including, without limitation, leasing commissions
with  respect to any option to renew or extend the Leases,  (it being  expressly
understood  and agreed that Buyer is assuming the  obligations to perform or pay
for any tenant improvements,  and to pay for any leasing commissions which shall
hereafter be owing under any renewals or  extensions  of the Leases or under any
leasing/commission agreement before or after the Closing Date which are approved
by Buyer).

          (h) Each party hereto shall indemnify, defend and hold the other party
(together with its officers, directors, and employees) harmless from and against
all claims, demands, causes of actions,  judgments,  damages, costs and expenses
(including,  without limitation,  reasonable,  actual attorneys' fees and courts
costs),  deficiencies,  settlements and investigations  which relate to matters,
actions or omissions  which arise out of or are based upon any of the  following
during such parties'  period of ownership,  which for Seller shall be the period
of time prior to Closing  and for Buyer  shall be the period of time on or after
Closing:

                                       9
<PAGE>

               (i) any obligation  under any contracts,  agreements and writings
entered into by or on behalf of such party in respect of the use,  construction,
operation,  ownership,  occupancy or  maintenance of any portion of the Property
arising out of an event occurring during such parties' period of ownership;

               (ii) any accident,  injury,  death or damage whatsoever caused to
any person or entity or loss of property,  occurring in or about the Property or
any part thereof,  or on any other property  connected with or adjacent  thereto
during such parties' period of ownership; or

               (iii) any breach of the  covenant set forth in Section  8(g),  or
with respect to any payment or  performance  obligation  under any of the Leases
for tenant  improvements  or under any of the Leases  and/or  leasing/commission
agreements for leasing commissions which have heretofore accrued,  which are now
due and owing or which shall hereafter accrue, as described in Section 8(g).

               (iv) any breach of a representation or warranty set forth in this
Agreement.

               (v)  Notwithstanding  the above but subject to the limitations on
Seller's  indemnity set forth in Section 8(g),  Seller shall not be  indemnified
for any  leasing  commissions  which are payable  subsequent  to the Closing and
relate  to  leases  in  force  on  the  date  hereof,  including  those  leasing
commissions  listed on Schedule C, and Buyer shall not be obligated to indemnify
Seller for  Service/Equipment  Contracts (as hereinafter  defined) which are not
assumed by the Buyer at Closing.

     9.  REPRESENTATIONS AND WARRANTIES.  "To the best of Seller's knowledge" or
other   references   herein  to  Seller's   knowledge   means  the  actual  (not
constructive)  knowledge  which  Mike  Duffy and  Vance  Voss  have  based  upon
reasonable  familiarity with the property records and continued involvement with
the Property.  Notwithstanding the foregoing,  the term "to the best of Seller's
knowledge"  shall not be construed to imply any covenant  that such  individuals
have  conducted  any  review of files or other  inquiry in  connection  with the
transaction   contemplated  by  this  Agreement.   Furthermore,   the  foregoing
individuals  are acting in the  capacity  as agents or  employees  of Seller and
shall have no personal liability with respect to any representations, warranties
or covenants of Seller in this Agreement.

          (a) Seller  hereby  represents  and  warrants  to Buyer as of the date
hereof and as of the date of Closing as follows:

               (i) Seller is a corporation  duly organized and validly  existing
under  the laws of the State of Iowa and is in good  standing  under the laws of
the State of Texas.

               (ii) Ownership.

                    (A)  Seller is the owner of the  Property  of record  and in
fact, legally and beneficially,  and to the best of Seller's  knowledge,  Seller
has good, marketable and insurable title to the Property in either fee simple or
leasehold estate.

                    (B) No person or  entity  other  than  Seller  and  Seller's
affiliates  has any interest in the legal or  beneficial  title to the Property;
there are no options to  purchase  the  Property  which are  effective,  nor has
Seller  previously  entered into any other  contract of sale or agreement of any
kind with a party other than Buyer which is presently  effective  and which will
not be  terminated  before  the date of this  Agreement.  After the date  hereof
Seller will not enter into any agreement or contract or negotiate with any party
other  than  Buyer  with  respect  to the sale of the  Property,  nor enter into
financial  arrangements of any kind with respect to the Property nor will Seller
pledge or assign any right,  title,  interest in or to the  Property or any part
thereof to any person or entity.
  
                                     10
<PAGE>

                    (C) Pursuant to that certain Assignment and Assumption dated
June 26, 1995, by and between  Trammell Crow Company No. 90 Limited  Partnership
("Trammell Crow") and Petula Associates, Ltd. ("Petula"), filed on July 29, 1995
in Volume 95126, Page 2245 in the Deed Records of Dallas County, Texas, Trammell
Crow intended to assign to Petula one hundred  percent (100%) of Trammell Crow's
entire  remaining  undivided  interest  in the  Ground  Lease  dated on or about
October 1, 1984 ("Ground Lease No. 1"), which Ground Lease No. 1 is evidenced by
that certain  Memorandum  of Lease dated March 1, 1988 by and between  Principal
Mutual Life Insurance  Company and  Dallas-Fort  Worth  Regional  Airport Board,
recorded  on March 4, 1988 in Volume  88044,  Page 1790 in the Deed  Records  of
Dallas County,  Texas and in that certain Ground Lease dated on or about October
1, 1984  ("Ground  Lease No. 2"),  which Ground Lease No. 2 is evidenced by that
certain  Memorandum of Lease dated March 1, 1988 by and between Principal Mutual
Life Insurance Company and Dallas-Fort Worth Regional Airport Board, recorded on
March 4, 1988 in Volume 88044,  Page 1801 in the Deed Records of Dallas  County,
Texas  and in that  certain  Ground  Lease  dated  on or about  October  1 ,1984
("Ground  Lease No. 3"),  which  Ground Lease No. 3 is evidenced by that certain
Memorandum  of Lease dated March 1, 1988 by and  between  Principal  Mutual Life
Insurance  Company and  Dallas-Fort  Worth Regional  Airport Board,  recorded on
March 4, 1988 in Volume 88044,  Page 1806 in the Deed Records of Dallas  County,
Texas. The Assignment and Assumption,  because of an inadvertent drafting error,
did not refer to Ground Lease No. 2 and Ground Lease No. 3.  Trammell Crow fully
intended to assign its entire remaining  undivided interest in both Ground Lease
No. 1,  Ground  Lease No. 2, and  Ground  Lease No. 3 to Petula.  Trammell  Crow
received good and adequate consideration for such conveyance,  and Petula is the
owner of all of Trammell Crow's interest in Ground Lease No. 1, Ground Lease No.
2, and Ground Lease No. 3.

                    (D)  The  parties  hereto  agree  that  they  shall  jointly
cooperate to obtain a quit claim deed from  Trammell  Crow post  Closing.  Until
such time as a quit claim deed is obtained  from  Trammell  Crow,  Seller  shall
indemnify  and hold Buyer  harmless from any claim that Seller has conveyed less
than 100% of the Lessee's interest in the  above-referenced  ground leases. This
indemnity shall survive the Closing until a quit claim deed is given.

               (iii) Leases.

                    (A) As of the date of the  Agreement  there  are no  leases,
subleases,  licenses or other rental agreements or occupancy agreements (written
or verbal) which grant any  possessory  interest in and to any space situated on
or in any of the  Property or that  otherwise  give rights with regard to use of
any  portions  of any of the  Property  other than the Leases  described  in the
Certified  Rent Roll,  as set forth in Exhibit B attached  hereto (said  leases,
together with any and all amendments,  modifications and supplements thereto and
guarantees thereof, are herein referred to collectively as the "Leases");

                    (B) The  copies of the  Leases  provided  to Buyer are true,
accurate  and  complete,  are in full force and effect and none of them has been
modified, amended or extended;

                    (C) There are no security  deposits or other  deposits other
than those listed on Schedule D.

               (iv) Service and  Management  Contracts.  To the best of Seller's
knowledge, except as set forth on Schedule E, neither Seller nor any other party
has entered into any construction,  design, engineering,  service,  maintenance,
supply, brokerage/leasing agreements, employee agreements,  management contracts
or Leases of personal  property  (collectively,  "Service/Equipment  Contracts")
affecting the construction, use, ownership,  maintenance and/or operation of the
Property that will continue  subsequent to the Closing.  Seller shall terminate,
at Seller's sole cost and expense, all  Service/Equipment  Contracts which Buyer
does not elect to assume in writing prior to the expiration of the Study Period.
All work  required  to be  performed  by Seller in  connection  with all Service
Equipment  Contracts or other contracts or requirements  with respect to periods
prior to the date of Closing  has been or will be fully  performed  and that all
such bills in connection with such work will be Seller's responsibility.  Seller
is not in default and to best of Seller's knowledge no other party is in default
under the Service/Equipment Contracts.

               (v) Hazardous Substances.  To the best of Seller's knowledge, (i)
the  Property  has not  been  used for the  generation,  treatment,  storage  or
disposal of any hazardous substances during the period in which Seller has owned
the  Property;  and (ii) there are no  underground  storage  tanks located on or
under  the  Property.  For the  purposes  of this  Section  9(a)(v),  "hazardous
substances" shall include "hazardous substances" as defined in the Comprehensive
Environmental  Response  Compensation and Liability Act of 1980, as amended,  42
U.S.C.  ss.ss.  9601 et. seq., and regulations  adopted pursuant to said Act, or
any similar  environmental  protection law of the state in which the Property is
located or its political subdivisions.

               (vi)  Ability  to  Perform.  Seller  has full  power to  execute,
deliver and carry out the terms and  provisions of this  Agreement and has taken
all necessary  action to authorize the  execution,  delivery and  performance of
this  Agreement,  and this Agreement  constitutes  the legal,  valid and binding
obligation  of  Seller  enforceable  in  accordance  with its  terms.  No order,
permission,   consent,  approval,   license,   authorization,   registration  or
validation  of, or filing  with,  or  exemption  by,  any  governmental  agency,
commission,  board or public authority is required to authorize,  or is required
in connection with, the execution, delivery and performance of this Agreement by
Seller or the taking by Seller of any action contemplated by this Agreement.

     The execution and delivery of this Agreement and the closing  documents and
the consummation of the transactions  contemplated  hereby will not result in or
constitute  any of the following:  (i) a default,  breach,  or violation,  or an
event that, with notice or lapse of time or both, would be a default, breach, or
violation,  of the  organizational  documents of Seller or any of the  following
with  respect to Seller or the  Property:  any  agreements,  contracts,  leases,
promissory  notes,   conditional  sales  contracts,   commitments,   indentures,
mortgages,  deeds of trust, or other agreements,  instruments or arrangements to
which  Seller is a party or by which it or the Property is bound and that relate
to the  Property;  (ii) a violation of or conflict with any term or provision of
any  judgment,  decree,  order,  statute,  injunction,  rule or  regulation of a
governmental  unit  applicable to Seller or the Property;  (iii) the creation or
imposition  of any lien,  charge or  encumbrance  on the  Property;  or (iv) not
require approval, waiver or authorization from a governmental or regulatory body
which has not been obtained.

               (vii)  Compliance  with Laws,  Etc.  Neither the entering into of
this Agreement nor the consummation of the transaction  contemplated hereby will
constitute or result in a violation or breach by Seller of any judgment,  order,
writ,  injunction or decree issued against or imposed upon it, or will result in
a violation of any applicable law, order, rule or regulation of any governmental
authority.   There  are  no  actions,   suits,   proceedings,   arbitrations  or
investigations pending or threatened against, relating to or affecting Seller or
the Property which might  interfere in a material  respect with the  transaction
contemplated by this  Agreement,  become a cloud on the title to the Property or
any portion  thereof or  otherwise  affect the  Property or Seller's  ability to
consummate the transaction contemplated hereby.

               (viii) No  Violation  Notice.  Except as set forth in Schedule F,
Seller has not received notices:


                                       12
<PAGE>


                    (A) from any federal,  state,  county or municipal authority
alleging any fire, health, safety, building, pollution, environmental, zoning or
other  violation  of law  in  respect  of the  Property  or  any  part  thereof,
including, without limitation, the occupancy or operation thereof, which has not
been entirely corrected;

                    (B) concerning the possible or anticipated  condemnation  of
any part of the Property, or the widening,  change of grade or limitation on use
of streets  abutting the same or  concerning  any special  taxes or  assessments
levied or to be levied against the Property or any part thereof;

                    (C)  concerning  any  change in the zoning or other land use
classification of the Property or any part thereof.

                    (D) of any pending insurance claim.

                    (E)  from any  governmental  authority  that  any  licenses,
permits,  certificates,   easements  and  rights  of  way,  including  proof  of
dedication,  required from any authorities having jurisdiction over the Property
or from private  parties for the existing  use,  occupancy  and operation of the
Property and to insure  vehicular and pedestrian  ingress to and egress from the
Property are in violation of any governmental laws or regulations, which has not
been corrected or will not be corrected by Closing.

               (ix)  No  Management  Contracts,  Employment  Contracts,  Unions,
Pension Plans. Seller has not entered into any management contracts,  employment
contracts  or labor union  contracts  and has not  established  any  retirement,
health  insurance,  vacation,  pension,  profit  sharing or other  benefit plans
relating to the operation or  maintenance  of the Property for which Buyer shall
have any liability or obligation. Seller has no employees at the Property, other
than at-will  employees who shall remain the  responsibility of Seller and as to
whom Buyer shall have no liability or obligation whatsoever.  As of the Closing,
there shall be no employees  working at the Property.  Seller shall have paid or
caused  to be paid to all  employees  of the  Seller  all  salary  and any other
payments which shall be payable on account of each such employee for such period
through Closing. Seller agrees to defend, indemnify and hold Buyer harmless from
any loss, expense,  cost and/or damage (including without limitation  reasonable
attorneys' fees and costs incurred in the defense of such claims) resulting from
claims  well-founded  or  unfounded,  by or on behalf of persons who are to have
been  employees of Seller on or prior to the Closing  arising out of any matter,
cause or thing prior to the Closing or any claims which may have  accrued  prior
to the Closing.

               (x) Seller has not received any written notice of the termination
or impairment of the furnishing of services to the Property of water, sewer, gas
(if any), electric, telephone, drainage and other such utility services.


                                       13
<PAGE>


               (xi) Assessments. Seller has not received notice that assessments
for public  improvements  have been made against the Property  which are unpaid,
including,  without limitation, those for construction of sewer and water lines,
streets,  sidewalks and curbs. To the best of Seller's  knowledge,  there are no
pending  or  proposed  special  assessments  affecting  or which may  affect the
Property or any portion thereof.

               (xii) Pre-Closing Deliveries Accurate. Except with respect to the
Certified  Rent Roll, to the best of Seller's  knowledge,  all of the documents,
writings and other  matters  delivered by Seller to Buyer  pursuant to Section 4
and information provided to Buyer pursuant to the terms of this Agreement, as of
the date hereof, and as of the Closing,  are true,  accurate and complete in all
material  respects and accurately  indicate all of the  information  referred to
therein,  are not  misleading  in any  respect,  and  none  of such  disclosures
misstated any material facts or omitted to state any material facts necessary to
make the  statements  made, in the light of the  circumstances  under which they
were made,  not  misleading.  This  representation  shall only be  applicable to
delivery  of any due  diligence  items  listed on  Schedule  B and not any items
delivered thereafter.

               (xiii) Miscellaneous Representations and Warranties.

                    (A) Seller agrees to conduct the business  operations of the
Property in the Seller's usual and normal manner until the Closing. Seller shall
not,  without the prior written consent  thereto of Buyer,  make (or permit) any
physical change in the Property.

                    (B) All bills and claims for labor  performed  and materials
furnished  to or for the benefit of the  Property  for all periods  prior to the
Closing  date  have  been  paid by  Seller  or will be paid by  Seller as of the
Closing.

                    (C) (Intentionally Deleted)

                    (D)  Seller is not a  "foreign  person",  as  defined in the
Internal Revenue Code.

                    (E) The premiums are paid and current for  replacement  cost
insurance  policies on the  Property  and,  to the best of  Seller's  knowledge,
insurance policies are in full force and effect.

               (xiv) All documents  executed by Seller which are to be delivered
to Buyer at the Closing are or at the Closing will be duly authorized,  executed
and delivered by Seller, are or at the Closing will be legal, valid, and binding
obligations of Seller,  are  sufficient to convey title,  and do not violate any
provisions  of any  agreement  to  which  Seller  is a party  or to  which it is
subject.

               (xv) Additional  Representations and Warranties Regarding Parcels
of Land with No Improvements:

                    (A)  Contracts.  There  are  no  construction,   management,
leasing,  service,  equipment,  supply,  maintenance or concession agreements in
effect with respect to the Property that will survive Closing.

                    (B)  Commitments.  Other  than as set  forth  in  Exhibit  K
attached  hereto,  Seller  has  not  made  any  commitment  or  proffer  to  any
governmental or quasi-governmental authority having jurisdiction or to any third
party,  to dedicate or grant any portion of the Property  for roads,  easements,
rights-of-way,  park lands or for any other public  purposes,  to construct  any
improvement,  to  grant  any  restrictions  or to incur  any  other  expense  or
obligation relating to the Property.

               (xvi)  Additional  Representation  and Warranties  Regarding Land
Under a Ground Lease:

                    (A) True,  correct and complete  copies of the Ground Leases
are attached hereto as Exhibit L. The Ground Leases are in full force and effect
and have not been modified, altered or amended other than as included in Exhibit
L nor has Seller  received  any written  notice of a default by Seller under the
Ground Leases,  which default  remains  uncured.  All payments of rent and other
charges  under the Ground  Leases  which were due and payable by Seller prior to

                                       14
<PAGE>

the date  hereof  under the  terms of the  Ground  Leases  have been paid and no
additional  payments or other obligations are currently due and owing under such
terms.  Seller is not in default  under the Ground  Leases  and,  to the best of
Seller's knowledge, the Ground Lessor is not in default under the Ground Leases.

                    (B)  Ground  Lessor  Estoppel  Certificates.   Seller  shall
deliver to Buyer Ground Lessor Estoppel Certificates in the form attached hereto
as Exhibit M from all Ground Lessors five (5) business days prior to the Closing
Date.

               (xvii)  Additional   Representations  and  Warranties   Regarding
Properties Where Improvements Are Under Construction. (Intentionally Deleted)

               (xviii)  Additional   Representations  and  Warranties  Regarding
Properties with Covenants, Conditions and Restrictions.

                    Seller  represents  and  warrants  that  (i) to the  best of
Seller's  knowledge that the Property  conveyed pursuant to the Agreement is not
in  default  in  the  performance  of any  covenant,  condition  or  restriction
contained in any  Declaration  of  Covenants,  Conditions  or  Restrictions,  as
amended, as more fully described in the Title Policy ("CCRs"),  and no condition
or circumstance  exists which, with the giving of notice or the passage of time,
would constitute a default thereunder;  (ii) no assessments,  payments,  fees or
expenses are  presently  due and payable  under such CCRs;  (iii) Seller  hereby
represents and warrants that none of the property  conveyed hereby is subject to
the terms of a  repurchase  option,  right of first  refusal or other  option to
purchase  such  property,  or  declarant's  right of approval  (individually,  a
"Right";  collectively,  the  "Rights"),  which Right has not lapsed,  fully and
irrevocably,   prior  to  being  exercised  by  the  beneficiary  thereof.  This
representation  and  warranty  shall  survive  for the period of any  applicable
statute of limitations  with regard to such Rights and shall be null and void in
the  event  any such  action  is  triggered  by an  affirmative  action of Buyer
(provided,  however,  the  foregoing is not intended to mean that the statute of
limitations  commences on the date  hereof);  (iv) Buyer and Seller  acknowledge
that all  setback  violations  and  landscaping  violations  with  regard to the
Properties,  if any, have been satisfied by credits at Closing on the Settlement
Statement.  Buyer hereby  agrees that upon  assumption of title it will not take
action to initiate any such option or revoke approval  against the Property;  in
such event  this  representation  shall be null and void and Buyer  shall not be
entitled to claim a Seller default for any action taken by Buyer.

          (b) Buyer hereby  represents  and  warrants to Seller as follows:  (i)
Buyer is a California limited  partnership,  duly organized and validly existing
under the laws of the State of California; all documents executed by Buyer which
are to be  delivered  to Seller at Closing  are or at the  Closing  will be duly
authorized,  executed, and delivered by Buyer, and are or at the Closing will be
legal,  valid,  and binding  obligations of Buyer, and do not and at the Closing
will not violate any provisions of any agreement to which Buyer is a party or to
which it is  subject;  and (ii)  Buyer  shall  furnish  all of the funds for the
purchase of the Property  (other than funds  supplied by  institutional  lenders
which will hold valid  mortgage  liens against the Property) and such funds will
not be from sources of funds or properties derived from any unlawful activity.

     10. RESPONSIBILITY FOR VIOLATIONS. All notices of violations of laws,
ordinances,  or regulations  ("Violations of Law"),  which are received prior to
the  Closing  from  any  governmental   department,   agency  or  bureau  having
jurisdiction  as to  conditions  affecting  the  Property  shall be  remedied or
complied  with by Seller.  If any such  violations  are subject to  challenge or
objection by Seller or are the  obligation of any tenant under the terms of such
tenant's  lease,  Buyer shall  cooperate  with  Seller to defend such  challenge
and/or require tenant to cure the violation.  Seller shall  indemnify  Buyer for
the reasonable,  actual  third-party costs of such challenge  incurred by Buyer,
including reasonable attorney fees. This obligation shall survive Closing on the
part of both parties.

     11. MAINTENANCE OF INSURANCE.  Until the Closing, Seller shall maintain its
present insurance on the Property. The risk of loss in and to the Property shall
remain vested in Seller until the recordation of the Deed to Buyer.

                                       15
<PAGE>

     12. CASUALTY OR CONDEMNATION. If prior to the Closing, the Property or any
"material"  portion thereof is damaged or destroyed by fire or casualty,  or any
part of the Property is taken or threatened to be taken by eminent domain by any
governmental  entity,  then Buyer shall have the option,  exercisable by written
notice given to Seller at or prior to the Closing,  either to (a) terminate this
Agreement,  whereupon all  obligations  of all parties  hereto shall cease,  the
Deposit shall be returned to Buyer and this Agreement  shall be void and without
recourse to the parties hereto except for provisions  which are expressly stated
to survive such  termination;  or (b) proceed with the purchase of the Property,
and in such case,  unless Seller shall have previously  restored the Property to
its condition prior to the occurrence of any such damage or destruction,  Seller
shall pay over or assign to Buyer, without recourse, all amounts received or due
(plus an amount equal to the sum of any  deductible  under any insurance  policy
covering the Property and any  additional  proceeds  which shall be necessary to
effect such restoration) from, and all claims against,  any insurance company or
governmental entity as a result of such destruction or taking, together with any
additional proceeds which shall be necessary to effect such restoration.  Within
five (5) days after receipt of written notice of such casualty or  condemnation,
Buyer will advise  Seller in writing  whether Buyer desires to proceed with this
transaction in light of such casualty or  condemnation.  The term  "material" as
used in this Section 12 shall mean damage or  destruction  in an amount equal to
or greater than 5% of the Purchase Price.

     13. INDEMNIFICATION.  Each party hereby agrees to indemnify the other party
and hold it harmless from and against any and all claims, demands,  liabilities,
costs, expenses,  penalties,  damages and losses, including, without limitation,
reasonable  attorneys' fees, resulting from any  misrepresentations or breach of
warranty or breach of covenant  made by such party in this  Agreement  or in any
document, certificate, or exhibit given or delivered to the other pursuant to or
in connection with this Agreement except as provided herein.

     14. CONDITION OF PROPERTY.  At or before the Approval Date, Buyer will
have approved the physical and  environmental  characteristics  and condition of
the Property,  as well as the economic  characteristics  of the Property.  Buyer
hereby  waives any and all defects in the physical,  environmental  and economic
characteristics  and condition of the Property  which would be disclosed by such
inspection  which  exist as of the  Approval  Date  except  such waiver does not
extend  to or  negate  the  effect  of any  matters  which  are  covered  by any
representation, warranty or covenant of Seller in Section 9 of this Agreement or
in any of the conveyance  documents,  Buyer further  acknowledges that except as
set forth in this  Agreement,  neither  Seller nor any of  Seller's  officers or
directors, nor Seller's employees, agents, representatives,  or any other person
or  entity  acting  on behalf of  Seller  (hereafter,  for the  purpose  of this
Section, such persons and entities are individually and collectively referred to
as the  "Seller")  have  made  any  representations,  warranties  or  agreements
(express or implied) by or on behalf of Seller as to any matters  concerning the
Property,  the economic results to be obtained or predicted,  or the present use
thereof or the suitability for Buyer's intended use of the Property,  including,
without  limitation,   the  following:   suitability  of  the  topography;   the
availability  of water  rights or  utilities;  the  present  and future  zoning,
subdivision  and any and all other land use matters;  the condition of the soil,
subsoil,  or  groundwater;  the  purpose(s)  to which the  Property  is  suited;
drainage;  flooding;  access to public  roads;  or  proposed  routes of roads or
extensions   thereof.   Buyer  acknowledges  and  agrees  that  except  for  the
representations and warranties contained herein and in the conveyance documents,
the Property is to be  purchased,  conveyed and accepted by Buyer in its present
condition,  "as is" and that no  patent  or latent  defect  in the  physical  or
environmental  condition  of the  Property  whether or not known or  discovered,
shall affect the rights of either party  hereto.  Except as set forth in Section
9,  any  documents  furnished  to  Buyer  by  Seller  relating  to the  Property
including, without limitation,  service agreements,  management contracts, maps,
surveys,  studies,  pro formas,  reports and other  information  shall be deemed
furnished as a courtesy to Buyer but without warranty from Seller. All work done
by Buyer in  connection  with  preparing  the Property for the uses  intended by
Buyer including any and all fees, studies, reports,  approvals,  plans, surveys,
permits,  and any expenses whatsoever  necessary or desirable in connection with
Buyer's  acquiring,  developing,  using and/or  operating the Property  shall be
obtained and paid for by, and shall be the sole  responsibility of Buyer.  Buyer
has  investigated and has knowledge of operative or proposed  governmental  land
use laws and  regulations to which the Property may be subject and shall acquire
the Property upon the basis of its review and determination of the applicability
and effect of such laws and regulations.

                                       16
<PAGE>

               Except for the  representations  and  warranties  in Section 9 of
this Agreement,  Buyer has neither received nor relied upon any  representations
concerning such land use laws and regulations from Seller.

               Except  for  the  representations,   warranties  and  indemnities
provided by Seller contained  herein and in the documents  delivered at Closing,
Buyer,  on behalf of itself and its  employees,  agents,  successors and assigns
attorneys and other  representatives,  and each of them,  hereby releases Seller
from and  against any and all claims,  demands,  causes of action,  obligations,
damages  and  liabilities  of any nature  whatsoever,  directly  or  indirectly,
arising out of or related to the condition of the Property.

               By signing in the space  provided below in this Section 14, Buyer
acknowledges that it has read and understood the provisions of this Section 14.

                                  BUYER:
                                  ------

                                  TPLP OFFICE PARK PROPERTIES
                                  a Texas Limited Partnership

                                  By: AMERICAN OFFICE PARK PROPERTIES,
                                      TPGP, INC. a California Corporation doing
                                      business in Texas under the name
                                      TPGP OFFICE PARK PROPERTIES, INC.

                                      By: /s/Ronald L. Havner, Jr.
                                          ---------------------------------
                                          Ronald L. Havner, Jr.
                                          President

     15. POSSESSION.  Buyer shall have and as a condition  precedent to Closing,
the right of  possession  on the Closing Date,  provided,  however,  that Seller
shall  allow  authorized  representatives  of  Buyer  reasonable  access  to the
Property for the purposes of satisfying  Buyer with respect to  satisfaction  of
any conditions precedent to the Closing contained herein.

     16.  TAX-DEFERRED  EXCHANGE.  Buyer and Seller agree that, at Seller's sole
election,  this  transaction  shall be  structured  as an exchange of  like-kind
properties  under Section 1031 of the Internal  Revenue Code of 1986, as amended
(the "Code"),  and the  regulations  and proposed  regulations  thereunder.  The
parties agree that if Seller wishes to make such  election,  it must do so prior
to the Closing Date. If Seller so elects,  Buyer shall reasonably cooperate with
Seller,  provided any such exchange is consummated pursuant to an agreement that
is  mutually  acceptable  to Buyer and Seller and which  shall be  executed  and
delivered  on or  before  the  Closing  Date.  Seller  shall  in all  events  be
responsible for all costs and expenses  related to the Section 1031 exchange and
shall fully  indemnify,  defend and hold Buyer harmless from and against any and
all liability,  claims,  damages,  expenses (including reasonable attorneys' and
paralegal  fees  and  reasonable  attorneys'  and  paralegal  fees  on  appeal),
proceedings  and causes of action of any kind or nature  whatsoever  arising out
of, connected with or in any manner related to such 1031 exchange that would not
have been  incurred by Buyer if the  transaction  were a purchase for cash.  The
provisions of the immediately  preceding  sentence shall survive Closing and the
transfer of title to subject Property to Buyer.  Notwithstanding anything to the
contrary  contained in this  Section,  any such Section 1031  exchange  shall be
consummated through the use of a facilitator or intermediary so that Buyer shall
in no event be requested or required to acquire title to any property other than
the Property.

     17. MISCELLANEOUS.

          (a) Notices.  Any notice  required or permitted to be given under this
Agreement shall be in writing and addressed as follows:

                                       17
<PAGE>

                    If to Seller:

                    Petula Associates, Ltd.
                    c/o Law Department
                    711 High Street
                    Des Moines, Iowa  50392-0301
                    Attn:  Dennis D. Ballard

                    With a copy to:

                    Petula Associates, Ltd.
                    c/o CRE-Equities
                    711 High Street
                    Des Moines, Iowa  50392-1370
                    Attn:  Michael S. Duffy

                    If to Buyer:

                    TPLP Office Park Properties
                    701 Western Ave., Suite 200
                    Glendale, CA 91201
                    Attention:  Ronald L. Havner, Jr.

                    with a copy to:

                    TPLP Office Park Properties
                    701 Western Avenue, Suite 200
                    Glendale, California 91201
                    Attention:  David Goldberg, Esq., General Counsel

                    and a courtesy copy which shall not be required for valid 
                    notice to:

                    Hale and Dorr LLP
                    1455 Pennsylvania Avenue, N.W.
                    Washington, D.C. 20004
                    Attention:  Steven S. Snider, Esq.

Unless otherwise specified herein, such notices or other communications shall be
deemed to be effective:  (i) one (1) business day after deposit with the courier
if sent by Federal Express or other recognized  overnight  delivery service;  or
(ii) upon receipt if  accomplished  by hand delivery or by confirmed  telecopied
delivery.  Either party may, from time to time, by notice in writing served upon
the other party,  in the same manner as prescribed  in this Section  designate a
different  mailing  address or a different  person to which all such notices are
thereafter to be addressed.

          (b) Brokers and Finders. Neither party has had any contact or dealings
regarding  the Property,  or any  communication  in connection  with the subject
matter of this  transaction,  through any licensed real estate  broker,  entity,
agent,  commission  salesperson,  or  other  person  who  will  claim a right to
compensation  or a commission  or finder's fee as a procuring  cause of the sale
contemplated herein,  except for Chadwick,  Saylor & Co., Inc., whose commission
shall be paid by Buyer.  In the event that any  company,  firm,  broker,  agent,
commission  salesperson or finder  perfects a claim for a commission or finder's
fee based upon any such contract,  dealings or communication,  the party through

                                       18
<PAGE>

whom the company,  firm, broker, agent,  commission  salesperson or finder makes
his claim  shall be  responsible  for said  commission  or fee and all costs and
expenses (including  reasonable  attorneys' fees) incurred by the other party in
defending against the same. No commission shall be paid or become payable unless
the Closing actually occurs. The provisions of this Subsection (b) shall survive
Closing and any termination, cancellation or recision of this Agreement.

          (c) Successors and Assigns.  This Agreement shall be binding upon, and
inure to the  benefit of, the parties  hereto and their  respective  successors,
heirs,  administrators and assigns;  provided further, however, Seller's consent
to an assignment of Buyer's rights and delegation of its  obligations  hereunder
shall not be required with respect to an  assignment of this  Agreement by Buyer
to any person or any  corporation,  general  partnership,  limited  partnership,
limited liability company or other lawful entity which is controlled by or under
common control with Buyer.

          (d) Amendments and Terminations.  Except as otherwise provided herein,
this Agreement may be amended or modified by, and only by, a written  instrument
executed by Seller and Buyer.

          (e) Governing Law. This  Agreement  shall be governed by and construed
in accordance with the laws of the State of Texas.

          (f) Merger of Prior  Agreements.  This Agreement  supersedes all prior
agreements and understandings between the parties hereto relating to the subject
matter hereof.

          (g) Enforcement. In the event either party hereto fails to perform any
of its  obligations  under  this  Agreement  or in the  event a  dispute  arises
concerning the meaning or interpretation of any provision of this Agreement, the
defaulting  party or the party not  prevailing in such dispute,  as the case may
be,  shall pay any and all costs and  expenses  incurred  by the other  party in
enforcing or establishing its rights hereunder,  including,  without limitation,
court costs and reasonable  attorneys'  fees.  Buyer and Seller both acknowledge
each has been  advised  by  counsel as to their  respective  rights,  duties and
obligations in this Agreement and have had ample  opportunity to negotiate same.
Thus,  both Buyer and Seller  acknowledge  that any ambiguity in this  Agreement
should not necessarily be resolved against the drafter of this Agreement.

          (h) Time of the Essence. Time is of the essence of this Agreement.

          (i) Counterparts. This Agreement may be executed in counterparts, each
of which shall be deemed to be an  original,  but such  counterparts  when taken
together shall constitute but one Agreement.

          (j) Survivability.  Except as otherwise provided herein, the covenants
contained in this  Agreement  shall survive the Closing of the purchase and sale
and shall not be deemed  merged in the deed,  but shall remain in full force and
effect.

          (k) No  Recordation.  Neither  Seller  nor  Buyer  shall  record  this
Agreement or memorandum  thereof in or among the land or chattel  records of any
jurisdiction.

          (l)  Proper  Execution.  The  submission  by  Seller  to Buyer of this
Agreement  in unsigned  form shall have no binding  force and effect,  shall not
constitute  an option,  and shall not confer any rights upon Buyer or impose any
obligations on Seller  irrespective of any reliance thereon,  change of position
or partial  performance  until Seller shall have executed this Agreement and the
Deposit  shall have been  received  by the Title  Company.  Notwithstanding  the
foregoing  sentence,  Seller's  submission to Buyer of this  Agreement  shall be
deemed withdrawn,  revoked and incapable of being executed by Buyer in the event
Buyer has not returned a duly executed original Agreement to Seller on or before
5:00 p.m. EST on April 30, 1998.

                                       19
<PAGE>



          (m) Personal  Liability.  There shall be no personal liability imposed
on the individuals who have executed this Agreement (or the attached exhibits)

          (n)  Survival  of   Representations.   Except  as  expressly  provided
otherwise in this  Agreement,  all  representations  and warranties  made by the
parties herein or in any instrument or document furnished in connection herewith
(except  warranties of title in the  conveyance  documents)  shall survive for a
period  of one (1) year  from the date of  Closing  or with  regard  to  Section
9(vvii)  and  Section  19,  one (1)  year  after  completion  of the  Authorized
Construction and any action thereon must be commenced within such period or they
are deemed  waived and released;  provided,  however,  Representation  9(a)(iii)
regarding  leases shall survive for the remaining  term of any lease  (excluding
renewals) for which Buyer did not receive a tenant  estoppel  executed  prior to
Closing; however, to the extent that tenant estoppels are obtained post Closing,
the  survival  period  for such  leases  shall be one (1) year  from the date of
Closing. Provided, however, the indemnity set forth in Section 9(a)(ii)(D) shall
survive  Closing  until such time as a quit claim deed is given by Trammell Crow
as provided in Section 9(a)(ii)(D).

          (o) Dates.  Whenever used herein, unless expressly provided otherwise,
the term  "days"  shall  mean  consecutive  calendar  days,  except  that if the
expiration  of any time period  measured  in days occurs on a Saturday,  Sunday,
legal holiday or other day when federal offices are closed in Washington,  D.C.,
such expiration shall automatically be extended to the next business day.

          (p) Prior to the Closing,  information received in connection with the
Property shall be kept strictly  confidential  and shall not,  without the prior
consent of the other  party,  be  disclosed  by such other party or used for any
purpose  other than  evaluating  the Property  except in the event of litigation
between the parties hereto,  Buyer and Seller agree that such information  shall
only be  transmitted  to Buyer's and Seller's  respective  officers,  directors,
trustees, employees, attorneys, accountants,  contractors, consultants, advisors
and agents who need to know such  information  for  purposes of  evaluating  the
Property and transactions  contemplated under this Agreement.  The provisions of
this  Section  17(p)  shall  not apply to any  information  which is a matter of
public  record or  obtainable  from other  sources and shall not prevent  either
Buyer or Seller from complying with laws,  rules,  regulations and court orders,
including,  without limitation,  governmental  regulatory,  disclosure,  tax and
reporting requirements.

                                       20
<PAGE>

     18. ESCROW AGENT. (Intentionally Deleted)

     19. SELLER'S ADDITIONAL  AGREEMENTS RELATED TO PROPERTIES WITH IMPROVEMENTS
UNDER CONSTRUCTION. (Intentionally Deleted)

     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first above written.

                                  SELLER:
                                  -------

                                  PETULA ASSOCIATES., LTD.,
                                  an Iowa corporation

                                  By:  /s/ M.S. Duffy
                                     -------------------------
                                           M.S. Duffy
                                  Its: Vice President


                                  By:  /s/ D.D. Ballard
                                     -------------------------
                                           D.D. Ballard
                                  Its: Counsel

                                  BUYER:
                                  ------

                                       TPLP OFFICE PARK PROPERTIES
                                       a Texas Limited Partnership

                                  By:  AMERICAN OFFICE PARK PROPERTIES,
                                       TPGP, INC. a California Corporation doing
                                       business in Texas under the name
                                       TPGP OFFICE PARK PROPERTIES, INC.
 
                                       By:/s/ Ronald L. Havner, Jr.
                                          ------------------------------
                                          Ronald L. Havner, Jr.
                                          President

                                          Buyer's Social Security Number or Tax
                                          Identification Number:95-4609260

                                       21

                                   Exhibit 23

                         CONSENT OF INDEPENDENT AUDITORS



We consent to the  incorporation by reference in the  Registration  Statement on
Form S-8 (No.  333-48313)  of PS  Business  Parks,  Inc.,  pertaining  to the PS
Business Parks,  Inc. 1997 Stock Option and Incentive Plan, and the Registration
Statement  on Form S-3 (No.  333-50463)  and the related  prospectus  of (i) our
report  dated  February 23, 1998 except for Note 9 as to which the date is March
18, 1998, with respect to the consolidated  financial  statements of PS Business
Parks, Inc. (successor to American Office Park Properties, Inc.) included in the
Current Report on Form 8-K/A dated April 17, 1998 of PS Business Parks, Inc. and
(ii) our report dated April 21, 1998 on the  combined  statement of revenues and
certain  operating  expenses  of the  Principal  Properties  for the year  ended
December 31, 1997  included in the Current  Report on Form 8-K dated May 4, 1998
of PS Business Parks, Inc.



                                                           /s/ ERNST & YOUNG LLP



Los Angeles, California
May 12, 1998



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission