PS BUSINESS PARKS INC/CA
8-K/A, 1998-11-13
REAL ESTATE INVESTMENT TRUSTS
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                       SECURITIES AND EXCHANGE COMMISSION


                             WASHINGTON, D.C. 20549


                                   FORM 8-K/A

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


       Date of Report (Date of earliest event reported) September 30, 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 5.   OTHER EVENTS

          During the  period  June 11,  1998  through  September  30,  1998,  PS
          Business   Parks,   Inc.  (the   "Company"  or  "PSB"),   through  its
          consolidated partnerships, acquired 4 commercial properties located in
          Virginia and Maryland,  containing  approximately 468,000 net rentable
          square feet, and approximately 7.2 acres of vacant land in Texas at an
          aggregate purchase price of approximately  $38.6 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 from its equity offerings in May,1998.

          The  following  table  provides  certain  information  concerning  the
          facilities acquired:
<TABLE>
<CAPTION>

                                                 Date of                          Purchase     Net Rentable     Occupancy at
            Name and Location       Seller       Acquisition  Property Type        Price     Square Footage      Closing
            ----------------------------------------------------------------------------------------------------------------
           <S>                    <C>              <C>         <C>              <C>              <C>               <C>  
            Northpointe D         D&R Immobilien    6/11/98    Industrial &
            Sterling, Virginia    Verwaltung                   Office            $3,577,000(1)     47,200           100%
                                  GMBH & Co.
                                  Holding KG

            Northpointe G         D&R Immobilien    6/11/98    Industrial &
            Sterling, Virginia    Verwaltung                   Office             3,746,000(2)     48,900           100%
                                  GMBH & Co.
                                  Holding KG

            Gunston               First and         6/17/98    Industrial &
            Lorton, Virginia      Second Gunston               Office            21,820,000(3)    246,500            94%
                                  L.P.

            Spectrum 95           8700 SD
            Landover, Maryland    Corporation       9/30/98    Industrial &
                                                               Office             8,473,000(4)    125,500            98%
                                                                                --------------   ----------        --------

            Subtotal -
            operating facilities                                                 37,616,000       468,100            96%
            

            Vacant land -          Pequot, L.C.     9/28/98
               Irving, Texas  
               (approx. 7.2 acres)                                                  996,000             -              
                                                                                --------------   ----------   

            Totals                                                              $38,612,000      468,100
                                                                                ==============   ==========
            --------------------
           Notes to Purchase Price:

          (1)  Acquired for cash of  $1,764,000,  the  assumption of an existing
               mortgage payable of $1,714,000 and the issuance of 4,332 OP Units
               having a value of $99,000.
          (2)  Acquired for cash of  $1,678,000,  the  assumption of an existing
               mortgage payable of $1,964,000 and the issuance of 4,550 OP Units
               having a value of $104,000.
          (3)  Acquired  for  cash  of  $10,049,000  and  the  assumption  of an
               existing mortgage payable of $11,771,000.
          (4)  Acquired for cash of 8,317,000 and the issuance of 6,540 OP Units
               having a value of $156,000.
</TABLE>
                                       2
<PAGE>



ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS

          (a)(3) Financial Statements specified by Rule 3.14 of Regulation S-X

                 Northpointe D and G Properties

                 *  Report of Independent Auditors

                 *  Combined Statements of Revenues and Certain Expenses for the
                    six months ended June 30, 1998 (unaudited) and for the year 
                    ended December 31, 1997

                 *  Notes to Combined Statements of Revenues and Certain 
                    Expenses

                 The Gunston Property

                 *  Report of Independent Auditors

                 *  Statements  of  Revenues  and  Certain  Expenses for the six
                    months  ended  June 30, 1998 (unaudited)  and  for  the year
                    ended December 31, 1997

                 *  Notes to Statements of Revenues and Certain Expenses

                 The Spectrum 95 Property

                 *  Report of Independent Auditors

                 *  Statements of  Revenues  and Certain  Operating Expenses for
                    the six months ended June 30, 1998  (unaudited) and for  the
                    year ended December 31, 1997

                 *  Notes  to Statements  of  Revenues  and  Certain  Operating
                    Expenses

          (b)    Pro forma Consolidated Financial Statements

          (c)    Exhibits

                 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:  November 13, 1998                                   By: /s/ Jack Corrigan
                                                              ------------------
                                                                   Jack Corrigan
                                      Vice President and Chief Financial Officer


                                       4
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
                         ------------------------------



The Board of Directors
of PS Business Parks, Inc.


We have  audited the  accompanying  combined  statement  of revenues and certain
expenses  of  the  Northpointe  D  and G  Properties  (as  defined  in  Note  1)
("Statement")  for the year  ended  December  31,  1997.  The  Statement  is the
responsibility of the property's management. Our responsibility is to express an
opinion on the above mentioned 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 Statement is free of material misstatement. An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures  in the Statement.  An audit also includes  assessing the accounting
principles  used  and  significant  estimates  made  by  management,  as well as
evaluating  the  overall  Statement  presentation.  We  believe  that our  audit
provides a reasonable basis for our opinion.

The  accompanying  Statement was prepared for the purpose of complying  with the
rules and regulations of the Securities and Exchange Commission.

In our opinion,  the Statement presents fairly the combined revenues and certain
expenses of the  Northpointe D and G Properties  for the year ended December 31,
1997, in conformity with generally accepted accounting principles.




                                                               ERNST & YOUNG LLP



Los Angeles, California
August 26, 1998

                                       5

<PAGE>

                         NORTHPOINTE D and G PROPERTIES

              COMBINED STATEMENTS OF REVENUES AND CERTAIN EXPENSES


                                                   Six months      Year ended
                                                 ended June 30,   December 31,
                                                     1998            1997
                                                 --------------   --------------
                                                   (unaudited)

Rental revenues                                      $475,000         $930,000

Certain operating expenses                            (87,000)        (176,000)

Interest expense                                     (161,000)        (228,000)
                                                 --------------   --------------

Rental revenues in excess of certain expenses        $227,000         $526,000
                                                 ==============   ==============


                              See accompany notes
                                       6

<PAGE>

                         NORTHPOINTE D and G PROPERTIES

          Notes to Combined Statements of Revenues and Certain Expenses

1.        BACKGROUND AND BASIS OF COMBINATION

          The accompanying  combined statements of revenues and certain expenses
          include  the   accounts  of  the   Northpointe   D  and  G  Properties
          (Northpointe  Properties),  located in  Virginia  and  acquired  by PS
          Business Parks, Inc. ("PSB") in June 1998. The combined statements are
          prepared  in order to comply with Rule 3.14 of  Regulation  S-X of the
          Securities and Exchange Commission.

          The combined  statements of revenue and certain  expenses include only
          the accounts and activity of the Northpointe  Properties.  Items which
          are  not  comparable  to the  future  operations  of  the  Northpointe
          Properties  have  been  excluded.  Such  items  include  depreciation,
          amortization, management fees, miscellaneous income, and straight line
          rent adjustments.

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

          In the decision to acquire the Northpointe Properties,  PSB considered
          the competition from other commercial  property owners,  the location,
          the  leases,  the  rental  rates  and  the  occupancy  levels  of  the
          properties.

          PSB has reviewed the expenses of the Northpointe Properties, including
          salaries of on-site personnel,  utilities,  property taxes,  supplies,
          insurance  and repairs and  maintenance.  PSB expects  that  operating
          expenses in the future will be consistent with those reported for 1997
          and the six months ended June 30, 1998. PSB expects to be able to pass
          inflationary  operating expense increases in future periods through to
          its tenants.

2.        SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

          Revenue Recognition

          The  leases  of  the  Northpointe  Properties  are  accounted  for  as
          operating  leases.  Minimum rent revenues are recognized on an accrual
          basis over the  respective  lease term.  Recoveries  from  tenants are
          recognized as income in the period the applicable costs are accrued.

          Use of Estimates

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


3.        MORTGAGE DEBT

          The Northpointe  Properties provide collateral for mortgage notes with
          approximate  outstanding  balances at December 31, 1997 of  $1,735,000
          and  $1,984,000.  The mortgage  notes bear  interest at 8.0% and 8.5%,
          respectively with due dates of April 2003 and July 2007, respectively.

                                       7

<PAGE>
4.       PROPERTY RENTALS

          Future  minimum  rental  revenues  under  non-cancelable  leases as of
          December 31, 1997 are as follows:

             1998............................................... $    821,000
             1999...............................................      816,000
             2000...............................................      807,000
             2001...............................................      766,000
             2002...............................................      380,000
             Thereafter.........................................    1,197,000
                                                                 -------------
                                                                 $  4,787,000
                                                                 =============

                                       8
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS


To the Board of Directors
of PS Business Parks, Inc.

We have audited the  accompanying  statement of revenues and certain expenses of
the Gunston  Property  (as defined in Note 1)  ("Statement")  for the year ended
December  31,  1997.  The  Statement  is the  responsibility  of the  property's
management.  Our  responsibility is to express an opinion on the above mentioned
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 Statement is free of material misstatement. An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures  in the Statement.  An audit also includes  assessing the accounting
principles  used  and  significant  estimates  made  by  management,  as well as
evaluating  the  overall  Statement  presentation.  We  believe  that our  audit
provides a reasonable basis for our opinion.

The  accompanying  Statement was prepared for the purpose of complying  with the
rules and regulations of the Securities and Exchange Commission.

In our opinion,  the Statement presents fairly the revenues and certain expenses
of the Gunston Property for the year ended December 31, 1997, in conformity with
generally accepted accounting principles.



                                                               ERNST & YOUNG LLP

Los Angeles, California
August 6, 1998


                                       9
<PAGE>
                              THE GUNSTON PROPERTY

                   Statements of Revenues and Certain Expenses



                                          Six months ended         Year ended 
                                            June 30, 1998      December 31, 1997
                                           -----------------   -----------------
                                              (Unaudited)

Rental revenues                               $1,215,000       $  2,299,000
Certain operating expenses                      (135,000)          (383,000)
Interest expense                                (456,000)          (951,000)
                                              ------------    ------------------
Rental revenues in excess of certain expenses $  624,000        $   965,000
                                              ============    ==================

  
                               See accompany notes
                                       10

<PAGE>
                              THE GUNSTON PROPERTY

              Notes to Statements of Revenues and Certain Expenses


1.        BACKGROUND AND BASIS FOR PRESENTATION

          The  accompanying  statements of revenues and certain expenses include
          the accounts of the Gunston Property, located in Virginia and acquired
          by PS Business  Parks,  Inc.  ("PSB") in June 1998. The statements are
          prepared  in order to comply with Rule 3.14 of  Regulation  S-X of the
          Securities and Exchange Commission.

          The  statements  of revenue  and  certain  expenses  include  only the
          accounts  and  activity of the Gunston  Property.  Items which are not
          comparable to the future  operations of the Gunston Property have been
          excluded.  Such items include depreciation,  amortization,  management
          fees, miscellaneous income and straight line rent adjustments.

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

          In the decision to acquire the Gunston  Property,  PSB  considered the
          competition from other commercial  property owners, the location,  the
          leases, the rental rates and the occupancy level of the property.

          PSB has  reviewed  the  expenses  of the Gunston  Property,  including
          salaries of on-site personnel,  utilities,  property taxes,  supplies,
          insurance  and  repairs and  maintenance.  PSB  expects  that  certain
          expenses will be approximately  $100,000  (unaudited) per annum higher
          in the future than amounts incurred under the 1997 ownership structure
          of the prior owner ($50,000  higher than the amounts  reported for the
          six  months  ended  June 30,  1998).  PSB  expects  to be able to pass
          inflationary  operating expense increases in future periods through to
          its tenants.

2.        SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

          Revenues Recognition

          The Gunston  Property  leases are accounted  for as operating  leases.
          Minimum rent  revenues  are  recognized  on an accrual  basis over the
          respective  lease term.  Recoveries  from  tenants are  recognized  as
          income in the period the applicable costs are accrued.

          Use of Estimates

          The  preparation of the  statements of revenues and certain  operating
          expenses in conformity with generally accepted  accounting  principles
          require  management 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.        MORTGAGE DEBT

          The Gunston Property  provides  collateral for a mortgage note with an
          approximate  outstanding  balance at December 31, 1997 of $12,110,000.
          The mortgage note bears interest at 7.625% and is due May 2004.

                                       11

<PAGE>
4.        PROPERTY RENTALS

          Future  minimum  rental  revenues  under  non-cancelable  leases as of
          December 31, 1997 are as follows:

            1998............................................... $  2,263,000
            1999...............................................    1,927,000
            2000...............................................    1,240,000
            2001...............................................    1,148,000
            2002...............................................      864,000
            Thereafter.........................................       13,000
                                                                -------------
                                                                $  7,455,000
                                                                =============


5.        RELATED PARTY

          Fredericks Construction Co. Inc., an affiliate of the Seller, occupied
          a rent-free space in the business park.



                                       12
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS




To the Board of Directors
of PS Business Parks, Inc.

We have audited the  accompanying  statement  of revenues and certain  operating
expenses of the  Spectrum 95 Property (as defined in Note 1)  ("Statement")  for
the year ended  December 31, 1997.  The Statement is the  responsibility  of the
property's management.  Our responsibility is to express an opinion on the above
mentioned 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 Statement is free of material misstatement. An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures  in the Statement.  An audit also includes  assessing the accounting
principles  used  and  significant  estimates  made  by  management,  as well as
evaluating  the  overall  Statement  presentation.  We  believe  that our  audit
provides a reasonable basis for our opinion.

The  accompanying  Statement was prepared for the purpose of complying  with the
rules and regulations of the Securities and Exchange Commission.

In our opinion, the Statement presents fairly the revenues and certain operating
expenses of the  Spectrum 95 Property for the year ended  December 31, 1997,  in
conformity with generally accepted accounting principles.





                                                               ERNST & YOUNG LLP





Los Angeles, California
September 21, 1998
                                       13

<PAGE>
<TABLE>
<CAPTION>
                            THE SPECTRUM 95 PROPERTY


              Statements of Revenues and Certain Operating Expenses


                                                                  Six months ended        Year ended December
                                                                    June 30, 1998              31, 1997
                                                                  ------------------      ------------------
                                                                     (Unaudited)
<S>                                                                <C>                      <C>         
Rental revenue                                                     $      384,000           $    850,000

Certain operating expenses                                                (96,000)              (183,000)
                                                                  ------------------      ------------------

Excess rental revenues over certain operating expenses             $      288,000           $    667,000
                                                                  ==================      ==================
</TABLE>
                                       14

<PAGE>
                            THE SPECTRUM 95 PROPERTY

         Notes to Statements of Revenues and Certain Operating Expenses


1.        BACKGROUND AND BASIS OF PRESENTATION

          The accompanying statements of revenues and certain operating expenses
          include the accounts of the Spectrum 95 Property,  located in Maryland
          and acquired by PS Business Parks, Inc. ("PSB") in September 1998. The
          statements  are  prepared  in  order  to  comply  with  Rule  3.14  of
          Regulation S-X of the Securities and Exchange Commission.

          The statements of revenue and certain operating  expenses include only
          the accounts and activity of the Spectrum 95 Property. Items which are
          not  comparable  to the future  operations of the Spectrum 95 Property
          have been  excluded.  Such items include  depreciation,  amortization,
          management   fees,   miscellaneous   income  and  straight  line  rent
          adjustments.

          An audited  statement is being  presented  for the most recent  fiscal
          year  available  instead of the three most  recent  years based on the
          following  factors:  (i) the  Spectrum 95 Property is acquired from an
          unaffiliated party and (ii) based on the investigation of the Spectrum
          95 Property by PSB,  management  is not aware of any material  factors
          relating to the Spectrum 95 Property  that would cause this  financial
          information  not to be  necessarily  indicative  of  future  operating
          results  other than the  factors  specifically  considered  by PSB, as
          described below.

          In the decision to acquire the Spectrum 95  Property,  PSB  considered
          the competition from other commercial  property owners,  the location,
          the leases, the rental rates and the occupancy level of the property.

          PSB has reviewed  the expenses of the Spectrum 95 Property,  including
          salaries of on-site personnel,  utilities,  property taxes,  supplies,
          insurance  and repairs and  maintenance.  PSB expects  that  operating
          expenses in the future will be consistent with those reported for 1997
          and the six months ended June 30, 1998. PSB expects to be able to pass
          inflationary  operating expense increases in future periods through to
          its tenants.

2.        SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

          Revenue Recognition

          The Spectrum 95 Property leases are accounted for as operating leases.
          Minimum rent  revenues  are  recognized  on an accrual  basis over the
          respective  lease term.  Recoveries  from  tenants are  recognized  as
          income in the period the applicable costs are accrued.

          Use of Estimates

          The  preparation of the  statements of revenues and certain  operating
          expenses in conformity with generally accepted  accounting  principles
          require  management 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.        PROPERTY RENTALS

          Future  minimum  rental  revenues  under  non-cancelable  leases as of
          December 31, 1997 are as follows:

            1998............................................... $    603,000
            1999...............................................      622,000
            2000...............................................      475,000
            2001...............................................      219,000
            2002...............................................      195,000
            Thereafter.........................................      434,000
                                                                -------------
                                                                $  2,548,000
                                                                =============

                                       15
<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 by PSB through its
consolidated  partnerships  during the period of June 11, 1998 through September
30 1998. During that period, PSB acquired four commercial  properties located in
Virginia and  Maryland,  containing  approximately  468,000 net rentable  square
feet, and  approximately 7.2 acres of vacant land in Texas for an aggregate cost
of  approximately  $38.6 million.  PSB used available cash and proceeds from the
issuance of common stock to fund the transactions.

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 shares 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.

                                       16
<PAGE>

In addition to adjustments to reflect the recently  acquired  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):

     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) was 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.

     9.   On May 4, 1998, PSB acquired 28 commercial  properties (the "Principal
          Properties") for an aggregate cost of approximately  $190.5 million in
          cash.

     10.  In May 1998,  PSB  completed two common stock  offerings,  raising net
          proceeds in aggregate  totaling $118.9 million through the issuance of
          5,025,800 common shares.

The pro forma  consolidated  balance sheet at June 30, 1998 has been prepared to
reflect the aforementioned  acquisition of a commercial property and vacant land
which occurred after June 30, 1998.

The pro forma consolidated statement of income for the six months ended June 30,
1998  has  been  prepared  assuming  (i)  the  aforementioned   acquisitions  of
commercial properties and vacant land (ii) the issuance of $155.0 million of PSB
Common Stock to institutional investors, (iii) the issuance of $118.9 million of
Common Stock to public  investors and (iv) the Merger between PSB and PSP11,  as
if all such  transactions  were  completed at the beginning of fiscal 1998.  The
operations of all property  acquisitions  are based on the historical  operating
results for 1998.

                                       17
<PAGE>

The pro forma  consolidated  statement of income for the year ended December 31,
1997  has  been  prepared  assuming  (i)  the  aforementioned   acquisitions  of
commercial properties and vacant land (ii) the issuance of $155.0 million of PSB
Common Stock to institutional investors, (iii) the issuance of $118.9 million of
Common Stock to public  investors and (iv) 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 pro forma adjustments are based upon available  information and upon certain
assumptions  as set forth in the notes to the pro forma  consolidated  financial
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
the dates  indicated or to project PSB's  results of  operations  for any future
date or period.

                                       18
<PAGE>
<TABLE>
<CAPTION>
                             PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                                  June 30, 1998
                                   (Unaudited)
             (Amounts in thousands, except share and per share data)

                                                                                            Property
                                                                            PSB           Acquisitions            PSB
                                                                       (Historical)         (Note 1)          (Pro Forma)
                                                                       ------------      -------------     ---------------
                                     ASSETS                  
<S>                                                                    <C>               <C>               <C>        
Cash and cash equivalents                                              $    36,355       $  (9,313)        $    27,042
Real estate facilities, net of accumulated depreciation                    635,498           9,469             644,967
Intangible assets, net of accumulated amortization                           1,733               -               1,733
Other assets                                                                 2,180               -               2,180
                                                                       ------------      -------------     ---------------
                                                             
     Total assets                                                      $   675,766       $      156        $   675,922
                                                                       ============      =============     ===============
                      LIABILITIES AND SHAREHOLDERS' EQUITY   
Accrued and other liabilities                                          $    11,256       $       -         $    11,256
Notes payable                                                               29,890               -              29,890
Minority interest                                                          151,225             156             151,381
Shareholders' equity:                                        
   Common stock, $0.01 par value, 100,000,000 shares         
      authorized, 23,635,650 issued and outstanding at June                                      -
      30, 1998                                                                 236                                 236
   Paid-in capital                                                         482,167               -             482,167
   Cumulative net income                                                    14,530               -              14,530
   Cumulative distribution paid                                            (13,538)              -             (13,538)
                                                                       ------------      -------------     ---------------
       Total shareholders' equity                                          483,395               -              483,395
                                                                       ------------      -------------     ---------------
   Total liabilities and shareholders' equity                          $   675,766       $     156         $    675,922
                                                                       ============      =============     ===============
                                                             
Book value per share of common stock (Note 2)                          $     20.45                         $      20.45
                                                                       ============                        ===============
Shares outstanding                                                      23,635,650                           23,635,650
                                                                       ============                        ===============
                                                             
                                                             
</TABLE>
         See Accompanying Notes to Pro Forma Consolidated Balance Sheet.
                                       19
<PAGE>
                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                  June 30, 1998
                                   (Unaudited)



1.   ACQUISITION OF REAL ESTATE FACILITIES

     On September 28, 1998,  PSB purchased  vacant land for an aggregate cost of
     $996,000 in cash.

     On  September  30,  1998,  PSB  acquired  the  Spectrum 95 Property  for an
     aggregate cost of $8,473,000 consisting of $8,317,000 cash and the issuance
     of 6,540 OP Units having a value of $156,000.

     The  following  pro  forma  adjustments  have  been  made to the pro  forma
     consolidated  balance sheet as of June 30, 1998 to reflect the  acquisition
     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:
               Vacant land............................................................              $     (996)
               Spectrum 95 Property...................................................                  (8,317)
                                                                                                    --------------
                                                                                                    $   (9,313)
                                                                                                    ==============

     *    Real estate  facilities  has been adjusted to reflect the  acquisition
          cost of the facilities acquired:
               Vacant land............................................................              $      996
               Spectrum 95 Property...................................................                   8,473
                                                                                                    --------------
                                                                                                    $    9,469
                                                                                                    ==============

     *    Minority  interest has been increased to reflect the issuance of 6,540
          OP Units  in  connection  with  the  acquisition  of the  Spectrum  95
          Property....................................................................                     156
                                                                                                    ==============

</TABLE>
                                       20
<PAGE>

2.        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 June 30, 1998.....................                23,635,650

</TABLE>
                                       21
<PAGE>
<TABLE>
<CAPTION>
                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For the Six Months Ended June 30 1998
                                   (Unaudited)
                  (Amounts in thousands, except per share data)

                                    PSB

                                                                                
                                                                                                           Pro Forma Merger
                                                         Pro Forma Adjustments                               Adjustments
                                                       ---------------------------                          -------------
                                                       Acquisition of                                        Exchange of
                                                      real estate from    Other          PSB                 real estate     PSB
                                           PSB        third parties    adjustments    Pre-Merger    PSP11    facilities  Post-Merger
                                       (Historical)      (Note 1)       (Note 2)     (Pro forma)  Historical)  (Note 4)  (Pro forma)
                                       ------------      --------       --------     ----------- ------------   --------  ----------
                                                          
REVENUES:
  Rental income:
<S>                                      <C>              <C>            <C>          <C>              <C>       <C>         <C>   
    Commercial properties                $ 35,824         10,805             -        46,629           232       1,744       48,605
    Mini-warehouse properties                   -              -             -             -         1,280      (1,280)           -
  Facility management fees                    331              -             -           331             -         (99)         232
  Interest and other income                   544              -             -           544             -           -          544
                                         ----------      --------       --------     -----------   ----------    --------  ---------
                                           36,699         10,805             -        47,504         1,512         365       49,381
                                         ----------      --------       --------     -----------   ----------    --------  ---------
EXPENSES:
  Cost of operations:
    Commercial properties                  10,982          3,081             -        14,063            86         666       14,815
    Mini-warehouse properties                   -              -             -             -           434        (434)           -
  Cost of managing facilities                  37              -             -            37             -         (13)          24
  Depreciation and amortization             6,556          3,353             -         9,909           250          68       10,227
  General and administrative                  996              -           150         1,146            36           -        1,182
  Interest expense                          1,069            888          (400)        1,557             -           -        1,557
                                         ----------      --------       --------     -----------   ----------    --------  ---------
                                           19,640          7,322          (250)       26,712           806         287       27,805
                                         ----------      --------       --------     -----------   ----------    --------  ---------
    Income before minority interest in
    income                                 17,059          3,483           250        20,792           706          78       21,576
  Minority interest in income(Note 6)      (5,683)             -           573        (5,110)            -         (25)      (5,135)
                                         ----------      --------       --------     -----------   ----------    --------  ---------


  Net income                             $ 11,376       $  3,483      $    823       $15,682       $   706       $  53     $ 16,441
                                         ==========      ========      =========     ===========   ==========    ========  =========

  Net income per share (Note 3 and 5):
    Basic                                $   0.76                                    $  0.69                                $  0.70
                                         ==========                                  ===========                           =========
    Dilute                               $   0.76                                    $  0.69                                $  0.69
                                         ==========                                  ===========                           =========
  Weighted average shares(Note 3 and 5):
    Basic                                  14,926                                     22,677                                 23,636
                                         ==========                                  ===========                           =========
    Diluted                                14,978                                     22,729                                 23,687
                                         ==========                                  ===========                           =========

</TABLE>
     See Accompanying Notes to Pro-Forma Consolidated Statements of Income.
                                       22

<PAGE>
                             PS BUSINESS PARKS, INC.

              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                     For the Six Months Ended June 30, 1998
                                   (Unaudited)



1.        ACQUISITION OF REAL ESTATE FACILITIES
          -------------------------------------

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


     *    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.

     *    On  June  11,  1998,  PSB  acquired  two  commercial  properties  (the
          "Northpointe   Properties")   for  an  aggregate  cost  of  $7,323,000
          consisting of $3,442,000 in cash,  $3,678,000 in debt  assumption  and
          the issuance of 8,882 OP Units having a value of $203,000.

     *    On June 17, 1998,  PSB acquired a commercial  property  (the  "Gunston
          Property")  for  an  aggregate  cost  of  $21,820,000   consisting  of
          $10,049,000 in cash and $11,771,000 in debt assumption.

     *    On September  30,  1998,  PSB acquired the Spectrum 95 property for an
          aggregate cost of $8,473,000  consisting of $8,317,000 in cash and the
          issuance of 6,540 OP Units having a value of $156,000.

     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:
<TABLE>
<CAPTION>
                                                                                                      (in 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 1998:
          *    Rental income for 1998 for the following properties:
                  Ammendale Property......................................................                1,562
                  March Acquisitions......................................................                2,363
                  Principal Properties....................................................               11,472
                  Northpointe Properties..................................................                  475
                  Gunston Property........................................................                1,215
                  Spectrum 95 Property....................................................                  384
     *    Less:  the portion of rental  income with respect to these  properties
          which has been included in PSB's historical amounts.............................               (6,666)
                                                                                                     ------------
                                                                                                     $   10,805
                                                                                                     ============
</TABLE>
                                       23
<PAGE>
<TABLE>
<CAPTION>
                                                                                                      (in 000's)
                                                                                                     ------------
     <S>                                                                                             <C>
     *    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:
                  Ammendale Property......................................................                  379
                  March Acquisitions......................................................                1,085
                  Principal Properties....................................................                3,058
                  Northpointe Properties..................................................                   87
                  Gunston Property........................................................                  135
                  Spectrum 95 Property....................................................                   96
          *    Less:  the portion of cost of  operations  with  respect to these
               properties   which  has  been   included   in  PSB's   historical
               amounts....................................................................               (1,759)
                                                                                                     ------------
                                                                                                        $ 3,081
                                                                                                     ============
          *    Depreciation   has  been   increased   to  reflect   six  months'
               depreciation expense.......................................................              $ 3,353
                                                                                                     ============
          *    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................................              $   888
                                                                                                     ============

2.        OTHER PRO FORMA ADJUSTMENTS
          ---------------------------

     *    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.........................             $   150
                                                                                                     ============
     *    A pro forma  adjustment has been made to decrease  interest expense as
          if the proceeds from the common stock  offerings were available at the
          beginning of the period to paydown the borrowings from Public Storage,
          Inc..............................................................................             $  (400)
                                                                                                     ============
     *    A pro forma adjustment has been made to decrease "Minority interest in
          income" to reflect the  decrease in minority  ownership as a result of
          the common stock offerings  (representing  the difference  between the
          pro  forma  amounts  less the  historical  amounts  included  in PSB's
          historical financial statements).................................................             $   573
                                                                                                     ============
</TABLE>
                                       24
<PAGE>
<TABLE>
<CAPTION>
3.        NET  INCOME  PER  COMMON  SHARE  (PSB  PRE-MERGER  PRO FORMA) HAS BEEN
          COMPUTED AS FOLLOWS:
          ----------------------------------------------------------------------
          <S>                                                                   <C>
          Historical net income..............................................   $ 11,376,000
     
          Historical weighted average common shares..........................     14,926,093

          Historical net income per common share.............................   $       0.76

          Pro  forma net income..............................................   $ 15,682,000

          Pro  forma weighted average common shares (1)......................     22,676,860

          Pro  forma net income per common share.............................   $       0.69

     ---------------------------------------------------------------------------------------
          (1)  
          Historical weighted average shares.................................     14,926,093 
          Adjusted for:

               Issuance of common stock in January 1998 to  subsidiary
               of a state pension fund in connection  with  conversion
               of OP Units into common  stock  (1,785,007  shares less
               1,696,250 included in the historical amounts).................         88,757

               Issuance of common stock in January 1998 in  connection
               with the exercise of stock options  (39,023 shares less
               26,735 included in the historical amounts)....................         12,288

               Pro forma  issuance  of common  stock to  institutional
               investors  (6,774,074 shares less 3,217,414 included in
               the historical amounts).......................................      3,556,660

               Pro  forma  issuance  of  common  stock  to the  public
               (5,025,800   shares  less   932,738   included  in  the
               historical amounts)...........................................      4,093,062
                                                                                 ------------

               Total  Pre-Merger  pro forma  weighted  average  shares.......     22,676,860
                                                                                 ============
</TABLE>
                                       25
<PAGE>
4.    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>
                                                                                                      (in 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 for the period  before
               the merger and exchange of properties.......................................          $    1,744
                                                                                                     ============

          *    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..............................          $   (1,280)
                                                                                                     ============

          *    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..........................................................          $     (87)
               *    eliminate the historical facility management fees related to
                    the two  commercial  properties  of  PSP11  acquired  in the
                    Merger.................................................................          $     (12)
                                                                                                     ------------
                                                                                                     $     (99)
                                                                                                     ============
          *    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.....................................................          $     (12)
               *    reflect  the  cost  of   operations  of  the  11  commercial
                    properties   acquired  in  the  Exchange   (before  cost  of
                    management) for the period before the merger and exchange of
                    properties.............................................................                665
               *    reflect the cost of  management  for PSP11's two  commercial
                    properties and the 11 commercial  properties acquired in the
                    Exchange...............................................................                 13
                                                                                                     ------------
                                                                                                     $     666
                                                                                                     ============
          *    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...........          $    (434)
                                                                                                     ============

          *    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..................................................................          $     (13)
                                                                                                     ============
</TABLE>
                                        26

<PAGE>
<TABLE>
<CAPTION>
                                                                                                      (in 000's)
                                                                                                     ------------
     <S>                                                                                             <C>
          *    A pro forma adjustment has been made to depreciation expense to:
               *    Eliminate  the  historical  depreciation  expense of PSP11's
                    facilities.............................................................          $     (248)
               *    Record  depreciation  expense  based on the acquired cost of
                    the  remaining  PSP11  facilities   ($47,553,000  cost,  20%
                    allocated  to  land,   the  remaining   cost   allocated  to
                    buildings, depreciated straight-line over 25 316 years).................         $       68

          *    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..................................         $      (25)


5.    POST-MERGER PRO FORMA NET INCOME PER SHARE OF COMMON STOCK HAS BEEN COMPUTED AS FOLLOWS:
      ---------------------------------------------------------------------------------------

                                                                                                   SIX MONTHS ENDED
                                                                                                    JUNE 30, 1998
                                                                                                   ----------------

          Post-Merger pro forma net income..................................................         $ 16,441,000

          Post-Merger pro forma weighted average common shares (1)..........................           23,635,650

          Pro forma net income per share of Common Stock....................................             $   0.70
          --------------------------------------------------------------------------------------------------------
          (1)
          Pre-Merger pro forma weighted average shares from Note 3 above....................           22,676,860

          Issuance of common stock to PSP11's Series A common shareholders (1,713,782 
          shares less 994,184 shares included in the historical amounts)....................              719,598

          Issuance of common stock to PSP11's Series B and C common shareholders 
          (569,655 shares less 330,463 shares included in the historical amounts)...........              239,192
                                                                                                   ----------------

          Post-Merger pro forma weighted average Common Stock common shares.................           23,635,650
                                                                                                   ================
</TABLE>
                                       27
<PAGE>
6.   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  7,400,951.   The  following  table
     summarizes the ownership interests:
<TABLE>
<CAPTION>
                                                                                                   SIX MONTHS ENDED
                                                                                                    JUNE 30, 1998
                                                                                                   ----------------
          <S>                                                                                      <C>
          Pro forma PSB Common Shares outstanding.................................................      23,635,650
          Pro forma OP Units owned by minority interests which are convertible into PSB 
           Common Shares..........................................................................       7,400,951
                                                                                                   ----------------
          Total PSB Common Shares outstanding assuming conversion of OP Units.....................      31,036,601
                                                                                                   ================

          Percentage ownership of PSB Common Shares outstanding...................................            76.2%
          Percentage ownership of minority interests..............................................            23.8%
                                                                                                   ----------------
                Total ownership interest..........................................................           100.0%
                                                                                                   ================
</TABLE>
                                       28
<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      $   50,964        $        -      $   82,171   
     Mini-warehouse properties                       -              -               -                 -               -   
   Facility management fees                        956            (52)              -                 -             904   
   Interest and other income                       453              -               -                 -             453   
                                           ------------   ---------------   ----------------- --------------  ------------
                                                31,578            986          50,964                 -          83,528   
                                           ------------   ---------------   ----------------- --------------  ------------
Expenses:
   Cost of operations:
     Commercial properties                      12,330            363          13,157                 -          25,850   
     Mini-warehouse properties                       -              -               -                 -               -   
   Cost of managing facilities                     189            (12)              -                 -             177   
   Depreciation and amortization                 5,195             92          11,919                 -          17,206   
   General and administrative                    1,461              -               -               300           1,761   
   Interest expense                                  1              -           2,284                 -           2,285   
                                           ------------   ---------------   ----------------- --------------  ------------
                                                19,176            443          27,360               300          47,279   
                                           ------------   ---------------   ----------------- --------------  ------------
   Income (loss) before minority interest
      in income                                 12,402            543          23,604              (300)         36,249   
   Minority interest in income (Note 7)         (8,566)             -               -              (678)         (9,244)  
                                           ------------   ---------------   ----------------- --------------  ------------

   Net income (loss)                            $3,836           $543         $23,604             $(978)        $27,005   
                                           ============   ===============   ================= ==============  ============

   Net income per share (Note 4 and 6):
       Basic                                $     1.23                                                       $     1.26   
                                           ============                                                       ============
       Diluted                              $     1.23                                                       $     1.26   
                                           ============                                                       ============
   Weighted average shares (Note 4 and 6):
       Basic                                     3,117                                                           21,352   
                                           ============                                                       ============
       Diluted                                   3,117                                                           21,352   
                                           ============                                                       ============


</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       $   91,597
     Mini-warehouse properties                   6,143          (6,143)               -
   Facility management fees                          -            (471)             433
   Interest and other income                        82               -              535
                                            --------------   --------------  --------------
                                                 7,643           1,394           92,565
                                            --------------   --------------  --------------
Expenses:
   Cost of operations:
     Commercial properties                         682           3,271           29,803
     Mini-warehouse properties                   2,082          (2,082)               -
   Cost of managing facilities                       -             (93)              84
   Depreciation and amortization                 1,198             324           18,728
   General and administrative                      201               -            1,962
   Interest expense                                  -               -            2,285
                                            --------------   --------------  --------------
                                                 4,163           1,420           52,862
                                            --------------   --------------  --------------
   Income before minority interest in
     income                                      3,480             (26)          39,703
   Minority interest in income (Note 7)              -            (248)          (9,492)
                                            --------------   --------------  --------------

   Net income (loss)                            $3,480           $(274)         $30,211
                                            ==============   ==============  ==============

   Net income per share (Note 4 and 6):
       Basic                                                                 $     1.28
                                                                             ==============
       Diluted                                                               $     1.28
                                                                             ==============
   Weighted average shares (Note 4 and 6)
       Basic                                                                     23,636
                                                                             ==============
       Diluted                                                                   23,636
                                                                             ==============


</TABLE>
     See Accompanying Notes to Pro-Forma Consolidated Statements of Income.
                                       29
<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>
                                       30
<PAGE>
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 $33,800,000 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.

     *    On  June  11,  1998,  PSB  acquired  two  commercial  properties  (the
          "Northpointe   Properties")   for  an  aggregate  cost  of  $7,323,000
          consisting of $3,442,000 in cash,  $3,678,000 in debt  assumption  and
          the issuance of 8,882 OP Units having a value of $203,000.

     *    On June 17, 1998,  PSB acquired a commercial  property  (the  "Gunston
          Property")  for  an  aggregate  cost  of  $21,820,000   consisting  of
          $10,049,000 in cash and $11,771,000 in debt assumption.

     *    On September  30,  1998,  PSB acquired the Spectrum 95 property for an
          aggregate cost of $8,473,000  consisting of $8,317,000 in cash and the
          issuance of 6,540 OP Units having a value of $156,000.


                                       31
<PAGE>
     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:
<TABLE>
<CAPTION>
                                                                                                      (in 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
                    Northpointe Properties...................................................               930
                    Gunston Property.........................................................             2,299
                    Spectrum 95 Property.....................................................               850

          *    Less:  the  portion  of  rental  income  with  respect  to  these
               properties which has been included in PSB's historical amounts................            (3,132)
                                                                                                    ------------
                                                                                                       $ 50,964
                                                                                                    ============
     *    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
                    Northpointe Properties...................................................                76
                    Gunston Property.........................................................               383
                    Spectrum 95 Property.....................................................               183
     *    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
                                                                                                    ------------
                                                                                                        $13,157
                                                                                                    ============
     *    Depreciation has been increased to reflect a full year's  depreciation
          expense............................................................................          $ 11,919
                                                                                                    ============

     *    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...............................................          $  2,284
                                                                                                    ============

</TABLE>
                                       32
<PAGE>

3.        OTHER PRO FORMA ADJUSTMENTS
<TABLE>
<CAPTION>
                                                                                                      (in 000's)
                                                                                                     ------------
     <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).............................................................           $  (678)
                                                                                                    ============
</TABLE>
                                       33
<PAGE>

4.        NET  INCOME  PER  COMMON  SHARE  (PSB  PRE-MERGER  PRO FORMA) HAS BEEN
          COMPUTED AS FOLLOWS:
          ----------------------------------------------------------------------
<TABLE>
<CAPTION>
          <S>                                                                                          <C>          
           Historical net income.........................................................               $   3,836,000

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

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

           Pro forma net income..........................................................               $  27,005,000

           Pro forma weighted average shares (1).........................................                  21,352,213

           Pro forma net income per share................................................               $        1.26
           ------------------------------------------------------------------------------------------------------------
           (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

               Issuance of common stock in connection with the exercise of stock options                       39,023

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

               Pro forma issuance of common stock to the public .........................                   5,025,800
                                                                                                         --------------

                    Total Pre-Merger pro forma weighted average shares...................                  21,352,213
                                                                                                         ==============

</TABLE>
                                       34
<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>
                                                                                                      (in 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>
                                       35
<PAGE>
<TABLE>
<CAPTION>
                                                                                                      (in 000's)
                                                                                                     ------------
     <S>                                                                                             <C>
     *    A pro  forma  adjustment  has been  made to  depreciation  expense  to
          reflect 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, 20% allocated to
               land,  the remaining  cost  allocated to  buildings,  depreciated
               straight-line over 25 years).................................................               1,522
                                                                                                     ------------
                                                                                                      $      324
                                                                                                     ============
          *    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>
                                       36
<PAGE>
<TABLE>
<CAPTION>
6.        POST-MERGER  PRO FORMA NET INCOME  PER SHARE OF COMMON  STOCK HAS BEEN.             
          COMPUTED AS FOLLOWS:
          ----------------------------------------------------------------------

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

           <S>                                                                                             <C> 
           Post-Merger pro forma net income.......................................................          $   30,211,000


           Post-Merger pro forma weighted average common shares (1) ..............................              23,635,650

           Pro forma net income per share.........................................................          $         1.28

           ----------------------------------------------------------------------------------------------------------------
           (1)
           Pre-Merger pro forma weighted average shares from Note 4 above..........................             21,352,213

           Issuance of common stock to PSP11's Series A common shareholders .......................              1,713,782

           Issuance of common stock to PSP11's Series B and C common shareholders..................                569,655
                                                                                                              --------------     


           Post-Merger pro forma weighted average shares...........................................             23,635,650
                                                                                                              ==============     

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  7,400,951.  The following
          table summarizes the ownership interests:

                                                                                                              Year Ended
                                                                                                           December 31, 1997
                                                                                                           ------------------
           Pro forma PSB Common Shares outstanding.................................................             23,635,650
           Pro forma OP Units owned by minority interests which are convertible into PSB Common
             Shares.............................................................................                 7,400,951
                                                                                                              --------------     
           Total PSB Common Shares outstanding assuming conversion of OP Units.....................             31,036,601
                                                                                                              ==============     

           Percentage ownership of PSB Common Shares outstanding...................................               76.2%
           Percentage ownership of minority interests..............................................               23.8%
                                                                                                              --------------     
                Total ownership interest...........................................................              100.0%
                                                                                                              ==============     

</TABLE>
                                       37

                         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.,
(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.,  (iii) our report  dated  August 26,  1998 on the
combined  statement of revenues and certain  expenses of the Northpointe D and G
Properties  for the year ended  December 31, 1997 included in the Current Report
on Form 8-K/A dated  September  30, 1998 of PS Business  Parks,  Inc.,  (iv) our
report dated August 6, 1998 on the statement of revenues and certain expenses of
the  Gunston  Property  for the year ended  December  31,  1997  included in the
Current Report on Form 8-K/A dated September 30, 1998 of PS Business Parks, Inc.
and (v) our report  dated  September  21, 1998 on the  statement of revenues and
certain  operating  expenses  of the  Spectrum  95  Property  for the year ended
December 31, 1997 included in the Current  Report on Form 8-K/A dated  September
30, 1998 of PS Business Parks, Inc.



                                                          /s/ ERNST & YOUNG LLP



Los Angeles, California
November 12, 1998


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