PS BUSINESS PARKS INC/CA
8-K/A, 1999-02-17
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) December 31, 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 of  November  4, 1998  through  January 6, 1999,  PS Business
Parks, Inc. (the "Company"), through its consolidated partnerships,  acquired 14
commercial  properties located in Texas and California for an aggregate purchase
price of $58.7 million and proposed to acquire two additional properties located
in Texas, through its consolidated partnerships, for an aggregate purchase price
of  approximately  $8.3 million.  The Company is not affiliated with the sellers
and the purchase price was established  through arm's length  negotiations.  The
Company  obtained the funds to acquire the  facilities  from its  existing  cash
balances and  borrowings of $26.5 million from its unsecured line of credit with
Wells Fargo Bank in  addition to the  assumption  of an existing  mortgage  note
payable of $8,673,000.

The following  table  provides  certain  information  concerning  the facilities
acquired:
<TABLE>
<CAPTION>
    Name and                                    Date of                        Purchase       Net Rentable   Occupancy
    Location                Seller            Acquisition  Property Type         Price       Square Footage  at Closing
- ---------------     ----------------------    -----------  -------------     -------------   --------------  ----------     
<S>                <C>                         <C>          <C>              <C>                 <C>          <C>        
Royal Tech 15
  Dallas, Texas    Petula Associates, Ltd.     11/4/98      Industrial &     $ 6,880,000(1)       57,088       100%
                                                            Office
Las Plumas         Las Plumas Business
  San Jose,        Center and Patrician        12/31/98     Industrial &      17,250,000(1)      213,634       83.6%
  California       Associates, Inc.                         Office

Ben White 1        CPF Austin Industrial
  Austin, Texas    Associates L.P.             12/31/98     Industrial &       4,163,000          54,385       100%
                                                            Office
McKalla 3          CPF Austin Industrial
  Austin, Texas    Associates L.P.             12/31/98     Industrial &       4,045,000          53,480       100%
                                                            Office
McKalla 4          CPF Austin Industrial
  Austin, Texas    Associates L.P.             12/31/98     Industrial &       3,517,000          59,600       100%
                                                            Office
Ben White 5        CPF Austin Industrial
  Austin, Texas    Associates L.P.             12/31/98     Industrial &       3,978,000          54,000       100%
                                                            Office
Mopac 6            CPF Austin Industrial
  Austin, Texas    Associates L.P.             12/31/98     Industrial &       1,929,000          42,633       71.8%
                                                            Office  
Rutland 14         CPF Austin Industrial
  Austin, Texas    Associates L.P.             12/31/98     Industrial &       2,990,000          61,247       69.3%
                                                            Office           -------------   --------------  --------
                                                                              20,622,000(2)      325,345       90.5%
Waterford A
  Austin, Texas    Waterford Sage               1/6/99      Industrial &       3,300,000          30,340       100%
                                                            Office
McNeil 6
  Austin, Texas    Peterson - Hill #6 L.P.      1/6/99      Industrial &       2,412,000          28,364       100%
                                                            Office
Rutland 11
  Austin, Texas    Peterson - Hill #6 L.P.      1/6/99      Industrial &       1,797,000          39,865       100%
                                                            Office
Rutland 12
  Austin, Texas    Peterson - Hill #6 L.P.      1/6/99      Industrial &       2,957,000          58,800       100%
                                                            Office
Rutland 13
  Austin, Texas    Crow Hicks Ltd.              1/6/99      Industrial &       2,593,000          52,389       100%
                                                            Office
Rutland 19
  Austin, Texas    BL - Austin Industrial Ltd.  1/6/99      Industrial &         870,000          21,096       100%
                                                            Office           -------------   --------------   --------  
                                                                              13,929,000(1)      230,854       100%
Waterford B
  Austin, Texas    Waterford Sage              5/31/99(3)   Industrial &       2,028,000          18,195       N/A
                                                            Office
Waterford C
  Austin, Texas    Waterford Sage              5/31/99(3)   Industrial &       6,318,000          57,164       N/A
                                                            Office           -------------   -------------   -------- 
                                                                               8,346,000(4)       75,359       N/A
                                                                             -------------   -------------   --------
Totals                                                                       $67,027,000         902,280       92.7%
                                                                             =============   =============   ========
Notes to Table:
(1)   Acquired for cash.
(2)   Acquired  for  cash of  $11,949,000  and  the  assumption  of an  existing mortgage note payable of $8,673,000.
(3)   Proposed acquisition date.
(4)   To be acquired for cash.
</TABLE>
                                       1
<PAGE>


Item 7.  Financial Statements and Exhibits

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

         Hill Properties

                  * Report of Independent Auditors

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

                  *  Notes  to  Combined  Statements  of  Revenues  and  Certain
                     Expenses

         The Las Plumas Property

                  *  Report of Independent Auditors

                  *  Statements of Revenues and Certain  Operating  Expenses for
                     the nine months ended  September 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



                                       2

<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:  February 16, 1999                                   By: /s/ Jack Corrigan
                                                              ------------------
                                                                   Jack Corrigan
                                      Vice President and Chief Financial Officer



                                       3
<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 Hill  Properties  (as defined in Note 1)  ("Statement")  for the
year ended  December 31, 1997. The Statement is the  responsibility  of the Hill
Properties' 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 Hill  Properties  for the year  ended  December  31,  1997,  in
conformity with generally accepted accounting principles.



                                                              ERNST & YOUNG LLP



Los Angeles, California
January 7, 1999



                                       4
<PAGE>



                                 HILL PROPERTIES
              Combined Statements of Revenues and Certain Expenses

<TABLE>
<CAPTION>
                                                             Nine months ended      Year ended
                                                            September 30, 1998   December 31, 1997
                                                           --------------------  -----------------
                                                               (unaudited)


<S>                                                        <C>                  <C>           
Rental revenues........................................    $    3,584,000        $    3,742,000

Certain operating expenses.............................          (805,000)             (847,000)

Interest expense.......................................          (552,000)             (746,000)
                                                           ----------------      -----------------

Rental revenues in excess of certain expenses..........    $    2,227,000        $    2,149,000
                                                           ================      =================
</TABLE>



                             See accompanying notes
                                       5
<PAGE>



                                                       
                                 HILL 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 Hill Properties (Hill Properties),  located
         in  Texas  acquired  and to be  acquired  by PS  Business  Parks,  Inc.
         ("PSB").  The combined  statements are prepared in order to comply with
         Rule 3.14 of Regulation S-X of the Securities and Exchange  Commission.
         The Hill  Properties  are comprised of 12 properties as of December 31,
         1997 and 14 properties as of September 30, 1998 as described below:
<TABLE>
<CAPTION>

         Name                  Location                 Status 
         -------------         --------                 -------------------------
         <S>                   <C>                      <C>    
         Ben White 1           Austin, Texas            Acquired in December 1998
 
         McKalla 3             Austin, Texas            Acquired in December 1998
  
         McKalla 4             Austin, Texas            Acquired in December 1998
  
         Ben White 5           Austin, Texas            Acquired in December 1998
  
         Mopac 6               Austin, Texas            Acquired in December 1998
 
         Rutland 14            Austin, Texas            Acquired in December 1998

         Waterford A           Austin, Texas            Acquired in January 1999

         McNeil 6              Austin, Texas            Acquired in January 1999

         Rutland 11            Austin, Texas            Acquired in January 1999

         Rutland 12            Austin, Texas            Acquired in January 1999

         Rutland 13            Austin, Texas            Acquired in January 1999
  
         Rutland 19            Austin, Texas            Acquired in January 1999
 
         Waterford B           Austin, Texas            Opened in 1998 and to be acquired in May 1999

         Waterford C           Austin, Texas            Opened in 1998 and to be acquired in May 1999
</TABLE>


         The combined  statements of revenue and certain  expenses  include only
         the accounts and activities of the Hill Properties.  Items that are not
         comparable to the future  operations of the Hill  Properties  have been
         excluded.  Such items include  depreciation,  amortization,  management
         fees,  interest income,  professional  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 Hill Properties were acquired and are to
         be  acquired  from  an  unaffiliated   party  and  (ii)  based  on  the
         investigation of the Hill Properties by PSB, management is not aware of
         any material  factors  relating to the Hill 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 Hill  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  Hill  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 nine months ended September 30, 1998.



                                        6
<PAGE>


                                 HILL PROPERTIES
         Notes to Combined Statements of Revenues and Certain Expenses


2.       Summary of Significant Accounting Policies

         Revenue Recognition

         The  leases  of the Hill  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 Hill  Properties  provide  collateral  for a mortgage  note with an
         outstanding  balance at December 31, 1997 of  $8,819,000.  The mortgage
         note bears interest at 8.4% and is due in November 2001.

4.       Property Rentals

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


                
                 1998.....................................   $     3,484,000
                 1999.....................................         2,730,000
                 2000.....................................         1,962,000
                 2001.....................................         1,333,000
                 2002.....................................           704,000
                 Thereafter...............................           658,000
                                                             ---------------
                                                             $    10,871,000
                                                             =============== 
                 

                                       7
<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 Las Plumas Property (as defined in Note 1) ("Statement") for the
year ended  December 31, 1997.  The Statement is the  responsibility  of the Las
Plumas 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 Las Plumas  Property for the year ended  December  31, 1997,  in
conformity with generally accepted accounting principles.



                                                               ERNST & YOUNG LLP
 


Los Angeles, California
January 22, 1999



                                       8
<PAGE>


                                           
                             THE LAS PLUMAS PROPERTY
              Statements of Revenues and Certain Operating Expenses


<TABLE>
<CAPTION>
                                                                Nine months ended         Year ended
                                                                September 30, 1998     December 31, 1997
                                                                 ----------------       ---------------
                                                                    (Unaudited)

<S>                                                              <C>                    <C>    
Rental revenues..........................................        $    1,777,000         $    2,278,000

Certain operating expenses...............................              (330,000)              (470,000)
                                                                 ----------------       ---------------

Rental revenues in excess of certain operating expenses..        $    1,447,000         $    1,808,000
                                                                 ================       ================
</TABLE>


                             See accompanying notes
                                       9
<PAGE>



  
                             THE LAS PLUMAS PROPERTY
         Notes to Statements of Revenues and Certain Operating Expenses


1.       Background and Basis for Presentation

         The accompanying  statements of revenues and certain operating expenses
         include the accounts of the Las Plumas Property,  located in California
         and acquired by PS Business Parks,  Inc.  ("PSB") in December 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 activities of the Las Plumas Property.  Items that are
         not comparable to the future operations of the Las Plumas Property have
         been   excluded.   Such  items  include   depreciation,   amortization,
         management fees,  professional 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 Las Plumas Property was acquired from an unaffiliated
         party and (ii) based on the investigation of the Las Plumas Property by
         PSB,  management is not aware of any material  factors  relating to the
         Las Plumas 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 Las Plumas 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 Las Plumas  Property,  including
         salaries of on-site  personnel,  utilities,  property taxes,  supplies,
         insurance  and  repairs  and  maintenance.  PSB  expects  that  certain
         operating expenses in the future will be consistent with those reported
         for 1997 and the nine months ended  September 30, 1998.  

2.       Summary of Significant Accounting Policies

         Revenue Recognition

         The Las Plumas 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.


                                       10
<PAGE>


                             THE LAS PLUMAS PROPERTY
         Notes to Statements of Revenues and Certain Operating Expenses


3.       Property Rentals

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


         1998.............................................   $     2,139,000
         1999.............................................         1,565,000
         2000.............................................         1,341,000
         2001.............................................           950,000
         2002.............................................           438,000
         Thereafter.......................................           315,000
                                                             ----------------
                                                             $     6,748,000
                                                             ================

                                       11
<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 November 4, 1998 through January
6, 1999. During that period,  PSB acquired 14 commercial  properties  located in
Texas and California for an aggregate  cost of  approximately  $58.7 million and
proposed  to acquire  two  additional  commercial  properties  located in Texas,
through its  consolidated  partnerships,  for an aggregate cost of approximately
$8.3 million.  The Company obtained the funds to acquire the facilities from its
existing cash balance and borrowings of $26.5 million from its unsecured line of
credit  with Wells  Fargo Bank in  addition  to the  assumption  of an  existing
mortgage note payable of $8,673,000.

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.


                                       12
<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  acquired  four  commercial   properties
              (the"Acquired  Properties")  from PSI in exchange for 1,480,968 OP
              units.

         2.   On July 31,  1997,  PSB acquired two  commercial  properties  (the
              "Baldon  Properties")  from an  unaffiliated  third  party  for an
              aggregate  cost of  approximately  $33,310,000 in cash. 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 a commercial  property  (the
              "Largo  Property")  from  an  unaffiliated   third  party  for  an
              aggregate cost of  approximately  $10,283,000,  consisting of cash
              totaling   $9,959,000   and  the  issuance  of  14,384   Operating
              Partnership  units ("OP  units")  having a value of  approximately
              $324,000.

         4.   On December 10, 1997,  PSB  acquired a  commercial  property  (the
              "Northpointe  Property") from an  unaffiliated  third party for an
              aggregate  cost of  approximately  $3,854,000,  consisting of cash
              totaling  $3,554,000  and the issuance of 13,111 OP units having a
              value of approximately $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.  The  subsidiary of the
              state pension fund, through a merger and contribution, transferred
              six commercial  properties (the "Acquiport  Properties") valued at
              approximately  $118,655,000  and  $1,000,000  in cash to PSB.  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  acquired a  commercial  property  (the
              "Ammendale  Property")  from an  unaffiliated  third  party for an
              aggregate cost of  approximately  $22,518,000,  consisting of cash
              totaling  $22,325,000  and the issuance of 8,428 OP units having a
              value of approximately $193,000.

         8.   In March 1998, PSB acquired two commercial  properties (the "March
              Acquisitions  Properties") from unaffiliated  third parties for an
              aggregate cost of  approximately  $32,916,000,  consisting of cash
              totaling  $17,377,000,  the  issuance of 44,250 OP units  having a
              value of  approximately  $1,013,000 and the assumption of existing
              mortgage notes payable of $14,526,000.

         9.   On May  4,  1998,  PSB  acquired  29  commercial  properties  (the
              "Principal  Properties")  from an unaffiliated  third party for an
              aggregate  cost of  approximately  $190.5  million  in  cash.  PSB
              financed the acquisition  costs through the use of available cash,
              proceeds  from  the  issuance  of  common  stock  in May  1998 and
              borrowings from an affiliate.

         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.

         11.  On June 11,  1998,  PSB acquired two  commercial  properties  (the
              "Northpointe  Properties") from an unaffiliated third party for an
              aggregate  cost of  approximately  $7,323,000,  consisting of cash
              totaling $3,442,000, the issuance of 8,882 OP units having a value
              of approximately  $203,000 and the assumption of existing mortgage
              notes payable of $3,678,000.

                                       13
<PAGE>

         12.  On June 17, 1998, PSB acquired a commercial property (the "Gunston
              Property") from an unaffiliated  third party for an aggregate cost
              of   approximately   $21,820,000,   consisting  of  cash  totaling
              $10,049,000  and  the  assumption  of an  existing  mortgage  note
              payable of $11,771,000.

         13.  On September  30, 1998,  PSB acquired a commercial  property  (the
              "Spectrum 95 Property")  from an  unaffiliated  third party for an
              aggregate  cost of  approximately  $8,473,000,  consisting of cash
              totaling  $8,317,000  and the  issuance of 6,540 OP units having a
              value of approximately $156,000.

         14.  On November 4, 1998,  PSB  acquired a newly  developed  commercial
              property (the "Royal Tech 15 Property") from an unaffiliated third
              party for an aggregate cost of approximately $6,880,000 in cash.

         15.  On December 31, 1998, PSB acquired six  commercial  properties and
              proposed to acquire six additional  commercial  properties and two
              newly developed properties  (collectively referred to as the "Hill
              Properties")  from an  unaffiliated  third party for an  aggregate
              cost of  approximately  $42,897,000,  consisting  of cash totaling
              $34,224,000  and  the  assumption  of an  existing  mortgage  note
              payable of $8,673,000.

         16.  On December 31, 1998, PSB acquired a commercial property (the "Las
              Plumas  Property")  from  an  unaffiliated   third  party  for  an
              aggregate cost of approximately $17,250,000 in cash.

The pro forma consolidated balance sheet at September 30, 1998 has been prepared
to reflect the subsequent  acquisitions and proposed  acquisitions of commercial
properties.

The pro  forma  consolidated  statement  of  income  for the nine  months  ended
September 30, 1998 has been prepared assuming (i) the subsequent acquisitions of
commercial properties (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.

The pro forma  consolidated  statement of income for the year ended December 31,
1997 has been prepared  assuming (i) the subsequent  acquisitions  of commercial
properties  (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  OF THE  ACQUIRED  PROPERTIES,  PSI EXCHANGE  PROPERTIES,  THE BALDON
PROPERTIES,  THE LARGO  PROPERTY,  ACQUIPORT  PROPERTIES  OWNED BY ACQUIPORT TWO
CORPORATION  AND ACQUIPORT THREE  CORPORATION,  THE GUNSTON  PROPERTY,  PROPOSED
ACQUISITION PROPERTIES,  NORTHPOINTE PROPERTY AND AMMENDALE PROPERTY INCLUDED IN
THE ABOVE  REFERENCED  PROXY  STATEMENT.  SEE FINANCIAL  STATEMENTS OF PRINCIPAL
PROPERTIES  INCLUDED  IN THE CURRENT  REPORT ON FORM 8-K DATED MAY 4, 1998.  SEE
FINANCIAL STATEMENTS OF NORTHPOINTE D AND G PROPERTIES, THE GUNSTON PROPERTY AND
THE  SPECTRUM  95 PROPERTY  INCLUDED  IN THE CURRENT  REPORT ON FORM 8-K/A DATED
SEPTEMBER 30, 1998.). 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.


                                       14
<PAGE>

                           PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                               September 30, 1998
                                   (Unaudited)

<TABLE>
<CAPTION>

                                                                                     Property
                                                                     PSB           Acquisitions            PSB
                                                                (Historical)         (Note 1)          (Pro Forma)
                                                              -----------------  ----------------   ----------------
                           ASSETS

<S>                                                            <C>               <C>                <C>                  
Cash and cash equivalents.................................     $    32,747,000   $   (31,854,000)   $       893,000

Real estate facilities, net of accumulated depreciation...         644,694,000        67,027,000        711,721,000

Intangible assets, net of accumulated amortization........           1,658,000                 -          1,658,000

Other assets..............................................           4,332,000                 -          4,332,000
                                                               ----------------  ----------------   ----------------

     Total assets.........................................     $   683,431,000   $    35,173,000    $   718,604,000
                                                               ================  ================   ================




            LIABILITIES AND SHAREHOLDERS' EQUITY


 
Accrued and other liabilities.............................     $    13,794,000   $             -    $    13,794,000

Line of credit                                                              -         26,500,000         26,500,000

Mortgage notes payable....................................          29,632,000         8,673,000         38,305,000

Minority interest.........................................         152,611,000                 -        152,611,000

Shareholders' equity:.....................................

   Common stock, $0.01 par value, 100,000,000 shares
      authorized, 23,635,650 issued and outstanding at
      September 30, 1998..................................             236,000                 -            236,000

   Paid-in capital........................................         482,327,000                 -        482,327,000

   Cumulative net income..................................          24,278,000                 -         24,278,000

   Cumulative distributions...............................         (19,447,000)                -        (19,447,000)
                                                               ----------------  ----------------   ---------------- 

       Total shareholders' equity.........................         487,394,000                 -        487,394,000
                                                               ----------------  ----------------   ---------------- 

   Total liabilities and shareholders' equity.............     $   683,431,000   $    35,173,000    $   718,604,000
                                                               ================  ================   ================

Book value per share (Note 2).............................     $         20.62                      $         20.62
                                                               ================                     ================

Shares outstanding........................................          23,635,650                           23,635,650
                                                               ================                     ================
</TABLE>


         See Accompanying Notes to Pro Forma Consolidated Balance Sheet.
                                       15
<PAGE>



                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                               September 30, 1998
                                   (Unaudited)


1.       Property Acquisitions

         On November 4, 1998, PSB acquired a newly developed commercial property
         (the "Royal Tech 15 Property") from an unaffiliated  third party for an
         aggregate cost of approximately $6,880,000 in cash.

         On December  31,  1998,  PSB acquired  six  commercial  properties  and
         proposed to acquire six additional  commercial properties and two newly
         developed   properties   (collectively   referred   to  as  the   "Hill
         Properties") from an unaffiliated  third party for an aggregate cost of
         approximately $42,897,000,  consisting of cash totaling $34,224,000 and
         the assumption of an existing mortgage note payable of $8,673,000.

         On December 31, 1998,  PSB  acquired a  commercial  property  (the "Las
         Plumas  Property")  from an  unaffiliated  third party for an aggregate
         cost of approximately $17,250,000 in cash.

         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated  balance sheet to reflect the aforementioned  transactions
         as if these properties had been owned by PSB as of September 30, 1998.
<TABLE>
         <S>                                                                                       <C>    
         *    Cash and cash equivalents have been adjusted:
              *    to  reflect  the cash  portion  of the  acquisition  cost of the  commercial
                    properties purchased:
                       Royal Tech 15 Property...................................................   $    (6,880,000)
                       Hill Properties..........................................................       (34,224,000)
                       Las Plumas Property .....................................................       (17,250,000)
              *   to reflect borrowings from the line of credit to fund the above acquisitions          26,500,000
                                                                                                   ----------------
                                                                                                   $   (31,854,000)
                                                                                                   ================ 

         *    Real  estate  facilities  have  been  adjusted  to  reflect  the
              acquisition cost of the facilities acquired:
                   Royal Tech 15 Property.......................................................   $     6,880,000
                   Hill Properties..............................................................        42,897,000
                   Las Plumas Property..........................................................        17,250,000
                                                                                                   ----------------
                                                                                                   $    67,027,000
                                                                                                   ================

         *    Line of credit has been increased to reflect  borrowings from the line of credit
              to fund the above acquisitions...................................................    $    26,500,000
                                                                                                   ================

         *    Mortgage  notes  payable  has been  increased  to reflect the  assumption  of an
              existing  mortgage  note  payable  in  connection  with the  acquisition  of Hill
              Properties.......................................................................    $     8,673,000
                                                                                                   ================
</TABLE>
          

2.       Book value per share

         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 September 30, 1998.........................     23,635,650
</TABLE>

          
                                       16
<PAGE>
                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For the Nine Months Ended September 30, 1998
                                   (Unaudited)
<TABLE>
<CAPTION>
                                                                                      PSB
                                                  ---------------------------------------------------------------------------------
                                                                           Pro Forma Adjustments                               
                                                                   ------------------------------                                
                                                                   Acquisition of                                                
                                                                  Real Estate from      Other            PSB                       
                                                      PSB          Third Parties     Adjustments      Pre-Merger          PSP11     
                                                 (Historical)         (Note 1)        (Note 2)        (Pro forma)     (Historical)  
                                                 --------------    --------------  --------------   --------------   --------------
<S>                                               <C>              <C>              <C>             <C>             <C>        
Revenues:
   Rental income:
     Commercial properties.....................  $  61,459,000     $  16,340,000   $           -    $  77,799,000    $     232,000  
     Mini-warehouse properties.................              -                 -               -                -        1,280,000  
   Facility management fees....................        440,000                 -               -          440,000                -  
   Interest and other income...................      1,077,000                 -      (1,077,000)               -                -  
                                                 --------------    --------------  --------------   --------------   --------------
                                                    62,976,000        16,340,000      (1,077,000)      78,239,000        1,512,000  
                                                 --------------    --------------  --------------   --------------   --------------
Expenses:
   Cost of operations:
     Commercial properties.....................     18,361,000         4,287,000               -       22,648,000           86,000  
     Mini-warehouse properties.................              -                 -               -                -          434,000  
   Cost of managing facilities.................         49,000                 -               -           49,000                -  
   Depreciation and amortization...............     11,421,000         8,229,000               -       19,650,000          250,000  
   General and administrative..................      1,589,000                 -         225,000        1,814,000           36,000  
   Interest expense............................      1,736,000         1,344,000         772,000        3,852,000                -  
                                                 --------------    --------------  --------------   --------------   --------------
                                                    33,156,000        13,860,000         997,000       48,013,000          806,000  
                                                 --------------    --------------  --------------   --------------   --------------
   Income (loss) before minority interest in        29,820,000         2,480,000      (2,074,000)      30,226,000          706,000  
     income....................................
   Minority interest in (income) loss (Note 6).     (8,696,000)                -       1,341,000       (7,355,000)               -  
                                                 --------------    --------------  --------------   --------------   --------------
   Net income (loss)...........................  $  21,124,000     $   2,480,000   $    (733,000)   $  22,871,000    $     706,000 
                                                 ==============    ==============  ==============   ==============   ============== 
   Net income per share (Note 3 and 5):
     Basic.....................................  $        1.18                                      $        0.99              
                                                 ==============                                     ==============              
     Diluted...................................  $        1.17                                      $        0.99              
                                                 ==============                                     ==============              
   Weighted average shares (Note 3 and 5):
     Basic.....................................     17,920,028                                         22,999,969                
                                                 ==============                                     ==============              
     Diluted...................................     17,989,772                                         23,069,713                
                                                 ==============                                     ==============              
</TABLE>
<TABLE>
<CAPTION>
                                                    Pro Forma
                                                     Merger
                                                   Adjustments                                                            
                                                   ----------   
                                                   Exchange of
                                                   Real Estate           PSB
                                                   Facilities        Post-Merger
                                                    (Note 4)         (Pro Forma)
                                                 --------------     --------------
<S>                                              <C>              <C>
Revenues:
   Rental income:
     Commercial properties.....................  $   1,744,000     $   79,775,000
     Mini-warehouse properties.................     (1,280,000)                 -
   Facility management fees....................        (99,000)           341,000
   Interest and other income...................              -                  -
                                                 --------------    ---------------
                                                       365,000         80,116,000
                                                 --------------    ---------------
Expenses:
   Cost of operations:
     Commercial properties.....................        666,000         23,400,000
     Mini-warehouse properties.................       (434,000)                 -
   Cost of managing facilities.................        (13,000)            36,000
   Depreciation and amortization...............         68,000         19,968,000
   General and administrative..................              -          1,850,000
   Interest expense............................              -          3,852,000
                                                 --------------    ---------------
                                                       287,000         49,106,000
                                                 --------------    ---------------
   Income (loss) before minority interest in            78,000         31,010,000
     income....................................
   Minority interest in (income) loss (Note 6).        (25,000)        (7,380,000)
                                                 --------------    ---------------
   Net income (loss)...........................  $      53,000     $   23,630,000
                                                 ==============    ===============
   Net income per share (Note 3 and 5):
     Basic.....................................                    $         1.00
                                                                   ===============
     Diluted...................................                    $         1.00
                                                                   ===============
   Weighted average shares (Note 3 and 5):
     Basic.....................................                        23,635,650
                                                                  ================
     Diluted...................................                        23,705,394
                                                                  ================
</TABLE>

     See Accompanying Notes to Pro Forma Consolidated Statement of Income.
                                       17
<PAGE>

                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)


1.       Acquisition of Real Estate Facilities from Third Parties

         * On  January  13,  1998,  PSB  acquired  a  commercial  property  (the
           "Ammendale  Property")  from  an  unaffiliated  third  party  for  an
           aggregate  cost  of  approximately  $22,518,000,  consisting  of cash
           totaling  $22,325,000  and the  issuance  of 8,428 OP units  having a
           value of approximately $193,000.

         * In March 1998,  PSB acquired two  commercial  properties  (the "March
           Acquisition  Properties")  from  unaffiliated  third  parties  for an
           aggregate  cost  of  approximately  $32,916,000,  consisting  of cash
           totaling $17,377,000,  the issuance of 44,250 OP units having a value
           of approximately  $1,013,000 and the assumption of existing  mortgage
           notes payable of $14,526,000.

         * On May 4, 1998, PSB acquired 29 commercial properties (the "Principal
           Properties")  from an unaffiliated  third party for an aggregate cost
           of approximately $190.5 million in cash. PSB financed the acquisition
           costs through the use of available  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")  from an  unaffiliated  third party for an
           aggregate  cost  of  approximately  $7,323,000,  consisting  of  cash
           totaling $3,442,000, the issuance of 8,882 OP units having a value of
           approximately  $203,000 and the assumption of existing mortgage notes
           payable of $3,678,000.

         * On June 17, 1998,  PSB acquired a commercial  property  (the "Gunston
           Property") from an unaffiliated  third party for an aggregate cost of
           approximately  $21,820,000,  consisting of cash totaling  $10,049,000
           and  the   assumption  of  an  existing   mortgage  note  payable  of
           $11,771,000.

         * On September  30,  1998,  PSB  acquired a  commercial  property  (the
           "Spectrum  95  Property")  from an  unaffiliated  third  party for an
           aggregate  cost  of  approximately  $8,473,000,  consisting  of  cash
           totaling $8,317,000 and the issuance of 6,540 OP units having a value
           of approximately $156,000.

         * On  November  4,  1998,  PSB  acquired a newly  developed  commercial
           property (the "Royal Tech 15 Property")  from an  unaffiliated  third
           party for an  aggregate  cost of  approximately  $6,880,000  in cash.
           Operations commenced subsequent to the period presented. Thus, no pro
           forma adjustments have been made to the statement of income.

         * On December 31, 1998,  PSB acquired  six  commercial  properties  and
           proposed  to acquire six  additional  commercial  properties  and two
           newly  developed  properties  (collectively  referred to as the "Hill
           Properties")  from an unaffiliated  third party for an aggregate cost
           of approximately $42,897,000, consisting of cash totaling $34,224,000
           and  the   assumption  of  an  existing   mortgage  note  payable  of
           $8,673,000.

         * On December 31, 1998,  PSB acquired a commercial  property  (the "Las
           Plumas  Property") from an unaffiliated  third party for an aggregate
           cost of approximately $17,250,000 in cash.

                                                                               .
                                       18
<PAGE>


                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)

         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated  statement  of income to reflect the  operations  of these
         properties  as if such  properties  had been owned and  operated by PSB
         throughout the entire period presented:
<TABLE>
         <S>                                                                                      <C>
         * Rental income has been  increased to reflect:  
                * the pro forma rental income as if the acquired properties were 
                  owned by PSB throughout the entire period presented:             
                       Ammendale    Property....................................................  $  2,425,000                   
                       March Acquisitions.......................................................     2,948,000                   
                       Principal Properties.....................................................    17,182,000                   
                       Northpointe Properties...................................................       836,000                   
                       Gunston Property.........................................................     2,033,000
                       Spectrum 95 Property.....................................................       648,000                     
                       Hill Properties..........................................................     3,584,000             
                       Las Plumas Property......................................................     1,777,000 
                * less the portion of rental  income with  respect to these  properties
                  already included in PSB's historical amounts..................................   (15,093,000)
                                                                                                  -------------   
                                                                                                  $ 16,340,000
                                                                                                  =============

         * Cost of operations has been increased to reflect:
                * the  pro  forma  cost  of  operations  as  if  the  acquired
                  properties  were owned by PSB  throughout  the entire  period presented:
                       Ammendale Property.......................................................       525,000
                       March Acquisitions.......................................................       802,000
                       Principal Properties.....................................................     4,645,000
                       Northpointe Properties...................................................       150,000
                       Gunston Property.........................................................       253,000
                       Spectrum 95 Property.....................................................       305,000
                       Hill Properties .........................................................       805,000
                       Las Plumas Property .....................................................       330,000
                * less  the cost of  operations  with  respect  to  these  properties  already
                   included in PSB's historical amounts.........................................    (3,528,000)
                                                                                                  -------------
                                                                                                  $  4,287,000
                                                                                                  =============

         *   Depreciation   has  been   increased  to  reflect  nine  months  of  incremental
             depreciation expense...............................................................  $  8,229,000
                                                                                                  =============

         *   Interest  expense has been  increased to reflect the  historical
             interest  expense for the period  presented  with  respect to the
             assumption of mortgage notes payable...............................................  $  1,344,000
                                                                                                  =============
</TABLE>
          

                                       19
<PAGE>


                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)

2.    Other Pro Forma Adjustments
<TABLE>
          <S>                                                                                <C>    
         * A pro forma  adjustment has been made to decrease  interest and other income to
           reflect the reduction in average cash balances................................... $  (1,077,000)
                                                                                             ============== 

      
         * 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.................................... $     225,000
                                                                                             ==============
      
      
         * Interest expense has been adjusted to reflect:
           *   additional  interest  expense  as a result  of  borrowings  from the line of  
               credit....................................................................... $   1,172,000
      
           *   a reduction  in 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..........................................      (400,000)
                                                                                             --------------
                                                                                             $     772,000
                                                                                             ==============
            
         * A pro  forma  adjustment  has  been  made to  decrease  the  minority interests' 
           share of income based upon its pro rata ownership interest in the above pro forma
           adjustments.....................................................................  $   1,341,000
                                                                                             ==============
      
</TABLE>

                                       20
<PAGE>


                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)

3.   Net income per share (PSB Pre-Merger Pro Forma) has been computed as 
     follows:
<TABLE>
     <S>                                                                                        <C>    
     Historical net income................................................................      $  21,124,000

     Historical weighted average shares...................................................         17,920,028

     Historical net income per share......................................................      $        1.18

     Pro forma net income.................................................................      $  22,871,000

     Pro forma weighted average shares (1)................................................         22,999,969

     Pro forma net income per share.......................................................      $        0.99

     -----------------------------------------------------------------------------------------------------------
     (1)
     Historical weighted average shares...................................................         17,920,028

     Adjusted for:

          Issuance  of shares in February  1998 in  connection  with the  exercise of stock
             options (39,021 shares less 30,875 included in the historical amounts)........             8,146

          Pro forma issuance of shares to institutional  investors  (6,774,074  shares less
             4,415,994 included in the historical amounts).................................         2,358,080

          Pro forma  issuance  of shares to the public  (5,025,800  shares  less  2,312,085
             included in the historical amounts)...........................................         2,713,715
                                                                                                ---------------
               Total Pre-Merger pro forma weighted average shares..........................        22,999,969
                                                                                                ===============
</TABLE>
      

                                       21
<PAGE>


                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)

4.   Pro Forma Merger Adjustments - Exchange of Real Estate Facilities

     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>
     <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.............     $    1,744,000
                                                                                                ===============

      

     *    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........     $   (1,280,000)
                                                                                                =============== 
      

      
     *    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........................................    $      (87,000)
          *    eliminate  the  historical  facility  management  fees  related  to the  two
               commercial properties of PSP11 acquired in the Merger........................           (12,000)
                                                                                                ---------------                  
                                                                                                $      (99,000)
                                                                                                ===============
            
     *    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..............................    $      (12,000)
          *    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...................................................           665,000
          *    reflect the cost of management  for PSP11's two  commercial  properties  and
               the 11 commercial properties acquired in the Exchange........................            13,000
                                                                                                --------------- 
                                                                                                $      666,000
                                                                                                ===============

      

     *    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.........................................................................     $     (434,000)
                                                                                                =============== 
      

     *    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............................................................     $      (13,000)
                                                                                                ===============
</TABLE>

                                       22
<PAGE>


                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)
<TABLE>
     <S>                                                                                        <C> 
     *    A pro forma adjustment has been made to depreciation expense to:
          *    Eliminate the historical depreciation expense of PSP11's facilities.........     $     (248,000)
          *    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)........           316,000
                                                                                                ---------------
                                                                                                $       68,000
                                                                                                ===============

     *    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......................................................................     $      (25,000)
                                                                                                ===============      

5. Net income  per share  (PSB  Post-Merger  Pro  Forma)  has been  computed  as follows:


     Post-Merger pro forma net income......................................................     $   23,630,000


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

     Pro forma net income per share........................................................     $         1.00


      ----------------------------------------------------------------------------------------------------------
     (1)
     Pre-Merger pro forma weighted average shares from Note 3 above........................         22,999,969
     
     Issuance  of shares to PSP11's  Series A common  shareholders  (1,713,782  shares less
     1,236,690 shares included in the historical amounts)..................................            477,092

     Issuance of shares to PSP11's Series B and C common shareholders  (569,656 shares less
     411,067 shares included in the historical amounts)....................................            158,589
                                                                                                ---------------
     Post-Merger pro forma weighted average shares.........................................         23,635,650
                                                                                                ===============
</TABLE>

                                       23
<PAGE>


                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For The Nine Months Ended September 30, 1998
                                   (Unaudited)

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 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>

     <S>                                                                                        <C>    
     Pro forma PSB shares outstanding......................................................         23,635,650
     Pro forma OP units owned by minority  interests which are  convertible  into PSB
     shares................................................................................          7,400,951
                                                                                                ---------------
     Total PSB shares outstanding assuming conversion of OP units..........................         31,036,601
                                                                                                ===============

     Percentage ownership of PSB shares outstanding........................................              76.2%
     Percentage ownership of minority interests............................................              23.8%
                                                                                                --------------- 
          Total ownership interest.........................................................             100.0%
                                                                                                =============== 
</TABLE>
      

                                       24
<PAGE>
                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For The Year Ended December 31, 1997
                                   (Unaudited)
<TABLE>
<CAPTION>
                                                                              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)   
                                      --------------   --------------   ----------------   -------------   -------------  
<S>                                   <C>              <C>              <C>                <C>             <C>            
Revenues:
   Rental income:
     Commercial properties..........  $  30,169,000    $  1,038,000     $   56,984,000     $          -    $ 88,191,000    
     Mini-warehouse properties......              -               -                  -                -               -   
   Facility management fees.........        956,000         (52,000)                 -                -         904,000   
   Interest and other income........        453,000               -                  -         (453,000)              -   
                                      --------------   --------------   ----------------   -------------   -------------  
                                         31,578,000         986,000         56,984,000         (453,000)     89,095,000   
                                      --------------   --------------   ----------------   -------------   -------------  
Expenses:
   Cost of operations:
     Commercial properties..........     12,330,000         363,000         14,474,000                -      27,167,000   
     Mini-warehouse properties......              -               -                  -                -               -   
   Cost of managing facilities......        189,000         (12,000)                 -                -         177,000   
   Depreciation and amortization....      5,195,000          92,000         15,474,000                -      20,761,000   
   General and administrative.......      1,461,000               -                  -          300,000       1,761,000   
   Interest expense.................          1,000               -          3,030,000        1,562,000       4,593,000   
                                      --------------   --------------   ----------------   -------------   -------------  
                                         19,176,000         443,000         32,978,000        1,862,000      54,459,000   
                                      --------------   --------------   ----------------   -------------   -------------  
   Income (loss) before minority         12,402,000         543,000         24,006,000       (2,315,000)     34,636,000   
     interest in income.............
   Minority interest in income           (8,566,000)              -                  -         (251,000)     (8,817,000)  
   (Note 7).........................  --------------   --------------   ----------------    ------------   -------------  
   Net income (loss)................  $   3,836,000    $    543,000     $   24,006,000     $ (2,566,000)    $25,819,000   
                                      ==============   =============    ================   ==============   ============  
   Net income per share (Note 4 and 6):
     Basic..........................  $        1.23                                                         $      1.21   
                                      =============                                                         ============  
     Diluted........................  $        1.23                                                         $      1.21   
                                      =============                                                         ============  
   Weighted average shares (Note 4 and 6):
     Basic..........................      3,116,688                                                          21,352,212   
                                      =============                                                         ============  
     Diluted........................      3,128,688                                                          21,352,212   
                                      =============                                                         ============  
</TABLE>
<TABLE>
<CAPTION>
                                                      Pro Forma
                                                        Merger
                                                      Adjustments
                                                      -----------
                                                      Exchange of
                                                      Real Estate         PSB
                                         PSP11        Facilities      Post-Merger
                                      (Historical)     (Note 5)       (Pro Forma)
                                      ------------    -----------     -------------
<S>                                   <C>             <C>             <C> 
Revenues:
   Rental income:
     Commercial properties..........  $ 1,418,000     $8,008,000      $ 97,617,000
     Mini-warehouse properties......    6,143,000     (6,143,000)               -
   Facility management fees.........            -       (471,000)          433,000
   Interest and other income........       82,000              -            82,000
                                      ------------    -----------     -------------
                                        7,643,000      1,394,000        98,132,000
                                      ------------    -----------     -------------
Expenses:
   Cost of operations:
     Commercial properties..........      682,000      3,271,000        31,120,000
     Mini-warehouse properties......    2,082,000     (2,082,000)                -
   Cost of managing facilities......            -        (93,000)           84,000
   Depreciation and amortization....    1,198,000        324,000        22,283,000
   General and administrative.......      201,000              -         1,962,000
   Interest expense.................            -              -         4,593,000
                                      ------------    -----------     -------------
                                        4,163,000      1,420,000        60,042,000
                                      ------------    -----------     -------------
   Income (loss) before minority        3,480,000        (26,000)       38,090,000
     interest in income.............
   Minority interest in income                  -       (248,000)       (9,065,000)
   (Note 7).........................  ------------    -----------     -------------
   Net income (loss)................  $ 3,480,000     $ (274,000)     $ 29,025,000
                                      ============    ===========     =============
   Net income per share (Note 4 and 6):
     Basic..........................                                  $       1.23
                                                                      =============
     Diluted........................                                  $       1.23
                                                                      =============
   Weighted average shares (Note 4 and 6):                            
     Basic..........................                                    23,635,650
                                                                      =============
     Diluted........................                                    23,635,650
                                                                      =============   
</TABLE>
     See Accompanying Notes to Pro Forma Consolidated Statement of Income.
                                       25
<PAGE>


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


1.       Acquisition of Real Estate From Affiliates

         On April 1, 1997, the Operating  Partnership  acquired four  commercial
         properties  (the  "Acquired  Properties")  from  PSI  in  exchange  for
         1,480,968 OP units.

         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated  statement  of income to reflect the  operations  of these
         properties  as if such  properties  had been owned and  operated by PSB
         throughout the entire period presented:

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

         *   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.......................................................................  $      (52,000)
                                                                                                =============== 

         *   Cost of operations has been increased to reflect:
             * the pro forma cost of  operations as if the acquired  properties  were owned
               by PSB throughout the entire period presented................................    $    1,227,000
             * less  the cost of  operations  with  respect  to  these  properties  already
               included in PSB's historical amounts.........................................          (905,000)
             * The above  adjustment  excludes  facility  management fees,  accordingly,  a
               pro forma adjustment has been made to reflect the actual cost of management..            41,000
                                                                                                ---------------
                                                                                                $      363,000
                                                                                                ===============

         *   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............  $      (12,000)
                                                                                                =============== 

         *   Depreciation  has been increased to reflect the incremental  depreciation of the
             commercial properties acquired on April 1, 1997..................................  $       92,000
                                                                                                ===============
</TABLE>
          
                                       26
<PAGE>


                             PS BUSINESS PARKS, INC.

               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For The Year Ended December 31, 1997
                                   (Unaudited)


2.      Acquisition of Real Estate From Third Parties

         * On July 31, 1997, PSB acquired two commercial properties (the "Baldon
           Properties")  from an unaffiliated  third party for an aggregate cost
           of  approximately  $33,310,000  in cash. 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.

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

         * On  December  10,  1997,  PSB  acquired a  commercial  property  (the
           "Northpointe  Property")  from an  unaffiliated  third  party  for an
           aggregate  cost  of  approximately  $3,854,000,  consisting  of  cash
           totaling  $3,554,000  and the  issuance  of 13,111 OP units  having a
           value of approximately $300,000.

         * 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.  The  subsidiary  of the state
           pension  fund,  through a merger and  contribution,  transferred  six
           commercial   properties  (the  "Acquiport   Properties")   valued  at
           approximately  $118,655,000  and  $1,000,000  in  cash  to  PSB.  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.

         * On  January  13,  1998,  PSB  acquired  a  commercial  property  (the
           "Ammendale  Property")  from  an  unaffiliated  third  party  for  an
           aggregate  cost  of  approximately  $22,518,000,  consisting  of cash
           totaling  $22,325,000  and the  issuance  of 8,428 OP units  having a
           value of approximately $193,000.

         * In March 1998,  PSB acquired two  commercial  properties  (the "March
           Acquisition  Properties")  from  unaffiliated  third  parties  for an
           aggregate  cost  of  approximately  $32,916,000,  consisting  of cash
           totaling $17,377,000,  the issuance of 44,250 OP units having a value
           of approximately  $1,013,000 and the assumption of existing  mortgage
           notes payable of $14,526,000.

         * On May 4, 1998, PSB acquired 29 commercial properties (the "Principal
           Properties")  from an unaffiliated  third party for an aggregate cost
           of approximately $190.5 million in cash. PSB financed the acquisition
           costs through the use of available  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")  from an  unaffiliated  third party for an
           aggregate  cost  of  approximately  $7,323,000,  consisting  of  cash
           totaling $3,442,000, the issuance of 8,882 OP units having a value of
           approximately  $203,000 and the assumption of existing mortgage notes
           payable of $3,678,000.

         * On June 17, 1998,  PSB acquired a commercial  property  (the "Gunston
           Property") from an unaffiliated  third party for an aggregate cost of
           approximately  $21,820,000,  consisting of cash totaling  $10,049,000
           and  the   assumption  of  an  existing   mortgage  note  payable  of
           $11,771,000.

         * On September  30,  1998,  PSB  acquired a  commercial  property  (the
           "Spectrum  95  Property")  from an  unaffiliated  third  party for an
           aggregate  cost  of  approximately  $8,473,000,  consisting  of  cash
           totaling $8,317,000 and the issuance of 6,540 OP units having a value
           of approximately $156,000.

         * On  November  4,  1998,  PSB  acquired a newly  developed  commercial
           property (the "Royal Tech 15 Property")  from an  unaffiliated  third
           party for an  aggregate  cost of  approximately  $6,880,000  in cash.
           Operations commenced subsequent to the period presented. Thus, no pro
           forma adjustments have been made to the statement of income.

                                       27
<PAGE>

         * On December 31, 1998,  PSB acquired  six  commercial  properties  and
           proposed  to acquire six  additional  commercial  properties  and two
           newly  developed  properties  (collectively  referred to as the "Hill
           Properties")  from an unaffiliated  third party for an aggregate cost
           of approximately $42,897,000, consisting of cash totaling $34,224,000
           and  the   assumption  of  an  existing   mortgage  note  payable  of
           $8,673,000.

         * On December 31, 1998,  PSB acquired a commercial  property  (the "Las
           Plumas  Property") from an unaffiliated  third party for an aggregate
           cost of approximately $17,250,000 in cash.


                                       28
<PAGE>


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


         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated  statement  of income to reflect the  operations  of these
         properties  as if such  properties  had been owned and  operated by PSB
         throughout the entire period presented:
<TABLE>
         <S>                                                                                         <C>
         *       Rental income has been increased to reflect:
                 *  the pro forma rental income as if the acquired  properties
                    were owned by PSB throughout the entire period presented:
                        Baldon Properties.......................................................     $    6,570,000
                        Largo Property..........................................................          1,343,000
                        Northpointe Property....................................................            631,000
                        Acquiport  properties...................................................         14,813,000
                        Ammendale Property......................................................          2,883,000
                        March Acquisitions......................................................          3,916,000
                        Principal Properties....................................................         19,861,000
                        Northpointe Properties..................................................            930,000
                        Gunston Property........................................................          2,299,000
                        Spectrum 95 Property....................................................            850,000
                        Hill Properties.........................................................          3,742,000
                        Las Plumas Property ....................................................          2,278,000
                 *  less the rental income with respect to these  properties  already included
                    in PSB's historical amounts.................................................         (3,132,000)
                                                                                                     ---------------
                                                                                                     $   56,984,000
                                                                                                     ===============

         *       Cost of operations has been increased to reflect:
                 *  the  pro  forma  cost  of  operations  as if the  acquired
                    properties  were owned by PSB  throughout the entire period presented:
                        Baldon Properties.......................................................     $    2,280,000
                        Largo Property..........................................................            367,000
                        Northpointe Property....................................................            125,000
                        Acquiport Properties....................................................          3,059,000
                        Ammendale Property......................................................            640,000
                        March Acquisitions......................................................          1,089,000
                        Principal Properties....................................................          4,160,000
                        Northpointe Properties..................................................            176,000
                        Gunston Property........................................................            383,000
                        Spectrum 95 Property....................................................            183,000
                        Hill Properties.........................................................            847,000
                        Las Plumas Property.....................................................            470,000
                 *  less the cost of  operations  with  respect  to these  properties  already
                    included in PSB's historical amounts........................................         (1,157,000)
                 *  plus a pro forma  adjustment  to reflect  additional  estimated  personnel
                    cost to manage the facilities and property taxes............................          1,852,000
                                                                                                     ---------------
                                                                                                     $   14,474,000
                                                                                                     ===============
</TABLE>
         

                                       29
<PAGE>


                             PS BUSINESS PARKS, INC.
               NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For The Year Ended December 31, 1997
                                   (Unaudited)
<TABLE>

         <S>                                                                                         <C>

         *       Depreciation  has been increased to reflect a year of incremental  depreciation
                 expense.........................................................................    $   15,474,000
                                                                                                     ===============

 
         *       Interest expense has been increased to reflect the historical  interest expense
                 for the period  presented  with  respect to the  assumption  of  mortgage  notes     
                 payable.........................................................................    $    3,030,000
                                                                                                     ===============

3.       Other Adjustments
  
         *       A pro forma  adjustment  has been made to decrease  interest and other income to
                 reflect the reduction in average cash balances...................................   $     (453,000)
                                                                                                     ===============

       
         *      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.............................................     $      300,000
                                                                                                     =============== 
          
          
         *      Interest expense has been adjusted to reflect  additional  interest expense as a
                result of borrowings from the line of credit.....................................    $    1,562,000
                                                                                                     ===============
        

         *      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.....................................................................     $     (251,000)
                                                                                                     =============== 
           
</TABLE>

                                       30
<PAGE>


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


4.        Net income per share (PSB Pre-Merger Pro Forma) has been computed as 
          follows:
<TABLE>
          <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..................................................................     $   25,819,000

          Pro forma weighted average shares (1).................................................         21,352,212

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

          ----------------------------------------------------------------------------------------------------------
          (1)
          Historical weighted average shares....................................................          3,116,688

          Adjusted for:

               Issuance  of  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 shares 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 shares to  subsidiary  of a state  pension  fund in  connection  with 
                  conversion of OP units into shares.............................................         1,785,008

               Issuance of shares in connection with the exercise of stock options ..............            39,021

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

               Pro forma issuance of shares to the public .......................................         5,025,800
                                                                                                     ---------------
                    Total Pre-Merger pro forma weighted average shares...........................        21,352,212
                                                                                                     ===============
</TABLE>
           
                                       31
<PAGE>


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


5.       Pro Forma Merger Adjustments - Exchange of Real Estate Facilities:

         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>
         <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........................................................................     $    8,008,000
                                                                                                     ===============

           
         *      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.......     $   (6,143,000)
                                                                                                     =============== 
           

         *      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....................................     $     (400,000)
                    eliminate  the  historical  facility  management  fees  related  to the two
                    commercial properties of PSP11 acquired in the Merger.......................            (71,000)
                                                                                                     ---------------
                                                                                                     $     (471,000)
                                                                                                     ===============
                      
         *      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.............................     $      (71,000)
                *   reflect the cost of operations of the 11 commercial  properties acquired in
                    the Exchange (before cost of management)....................................          3,249,000
                *   reflect the cost of management  for PSP11's two  commercial  properties and
                    the 11 commercial properties acquired in the Exchange.......................             93,000
                                                                                                     ---------------
                                                                                                     $    3,271,000
                                                                                                     ===============
           
          
         *      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....................................................................     $   (2,082,000)
                                                                                                     =============== 
           

           

         *      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..............................................     $      (93,000)
                                                                                                     =============== 
</TABLE>
           

                                       32
<PAGE>


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

<TABLE>
         <S>                                                                                         <C>

         *      A pro forma adjustment has been made to depreciation expense to reflect the:
                *   Eliminate the historical depreciation expense of PSP11's facilities.........     $   (1,198,000)
                *   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).......          1,522,000
                                                                                                     ---------------
                                                                                                     $      324,000
                                                                                                     ===============

         *      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.....................................................................     $     (248,000)
                                                                                                     ================ 
</TABLE>
           
                                       33
<PAGE>


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


6.        Net income  per share  (PSB  Post-Merger  Pro  Forma)  has been  
          computed as follows:

<TABLE>
          <S>                                                                                       <C>
          Post-Merger pro forma net income......................................................    $    29,025,000


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

          Pro forma net income per share........................................................    $          1.23


          ----------------------------------------------------------------------------------------------------------
          (1)
          Pre-Merger pro forma weighted average shares from Note 4 above........................         21,352,212

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

          Issuance of shares to PSP11's Series B and C common shareholders......................            569,656
                                                                                                    ----------------

           
           
          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 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:

             Pro forma PSB shares outstanding...................................................         23,635,650
             Pro forma OP units owned by minority interests which are convertible into PSB shares         7,400,951
                                                                                                    ----------------
             Total PSB shares outstanding assuming conversion of OP units.......................         31,036,601
                                                                                                    ================

             Percentage ownership of PSB shares outstanding.....................................              76.2%
             Percentage ownership of minority interests.........................................              23.8%
                                                                                                    ----------------
                Total ownership interest........................................................             100.0%
                                                                                                    ================
</TABLE>
           
                                       34


                                   Exhibit 23





                         CONSENT OF INDEPENDENT AUDITORS


We consent to the  incorporation by reference in the  Registration  Statement on
Form S-8 (No.  333-48313)  of PS  Business  Parks,  Inc.,  pertaining  to the PS
Business Parks,  Inc. 1997 Stock Option and Incentive Plan, and the Registration
Statement  on Form S-3 (No.  333-50463)  and the related  prospectus  of (i) our
report  dated  February 23, 1998 except for Note 9 as to which the date is March
18, 1998, with respect to the consolidated  financial  statements of PS Business
Parks, Inc. (successor to American Office Park Properties, Inc.) included in the
Current  Report on Form 8-K/A dated April 17, 1998 of PS Business  Parks,  Inc.,
(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.,  (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.,  (vi) our report dated January 7, 1999 on
the combined  statement of revenues and certain  expenses of the Hill Properties
for the year ended  December  31, 1997  included  in the Current  Report on Form
8-K/A dated  December 31, 1998 of PS Business  Parks,  Inc. and (vii) our report
dated  January  22, 1999 on the  statement  of  revenues  and certain  operating
expenses  of the Las  Plumas  Property  for the year  ended  December  31,  1997
included  in the  Current  Report on Form 8-K/A  dated  December  31, 1998 of PS
Business Parks, Inc.





                                                           /s/ ERNST & YOUNG LLP



Los Angeles, California
February 16, 1999



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