PS BUSINESS PARKS INC/CA
8-K/A, 2000-03-13
REAL ESTATE INVESTMENT TRUSTS
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                   FORM 8-K/A


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

       Date of Report (Date of earliest event reported) December 30, 1999


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

<TABLE>
<CAPTION>

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

</TABLE>,

               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 January 29, 1999 through  December  30,  1999,  PS Business
Parks,  Inc. ("PSB" or the "Company"),  through its  consolidated  partnerships,
acquired nine  commercial  properties  and two parcels of vacant land located in
Northern Virginia, Northern California,  Texas and Arizona for an aggregate cost
of approximately $83 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,  proceeds from the issuance of preferred  stock and preferred units in
its operating  partnership  in addition to the  assumption of existing  mortgage
notes payable totaling $19,719,000.

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>

Lafayette
  Chantilly, Virginia      Taurus/Lafayette, L.L.C.    1/29/99    Industrial & Office   $ 4,850,000          56,916          100%

Monroe II                  D+R Monroe Limited
  Herndon, Virginia        Partnership                 1/29/99           Office           5,789,000          50,750          100%
                                                                                        --------------   --------------  -----------
                                                                                         10,639,000(1)      107,666          100%


Dulles South               Sullyfield Circle
  Chantilly, VA            Limited Partnership         6/30/99           Office           3,697,000          38,502          100%

Sullyfield Circle          Sullyfield Circle
  Chantilly, VA            Limited Partnership         6/30/99    Industrial & Office     4,487,000          59,922           94%

Park East I & II           Galaxy Investment Assoc.
  Chantilly, VA            Limited Partnership III     6/30/99    Industrial & Office    13,199,000         114,942          100%

Park East III              Galaxy Land Associates
  Chantilly, VA            Limited Partnership         6/30/99    Industrial & Office     8,681,000          83,300           90%
                                                                                        --------------   --------------  -----------
                                                                                         30,064,000(2)      296,666           96%


Northpointe                Metropolitan Life
  Sacramento, CA           Insurance Company           7/29/99    Industrial & Office    16,856,000(3)      211,017           91%


Westchase Corporate Park   Cave Creek/Westchase
  Houston, TX              Limited Partnership        12/30/99    Industrial & Office     9,519,000         176,977           95%

Phoenix Corporate Park     Cave Creek/Westchase
  Phoenix, AZ              Limited Partnership        12/30/99    Industrial & Office    13,037,000         199,581           95%
                                                                                        --------------   --------------  -----------
                                                                                         22,556,000(3)      376,558           95%

Vacant land (9.2 acres)
  Chantilly, VA            Lafayette Properties,       1/29/99                            1,006,000(3)            -             -
                           L.L.C.

Vacant land (6.4 acres)
  Herndon, VA              Nagoldpark L.P.             6/30/99                            1,969,000(3)            -             -

                                                                                        --------------   --------------  -----------
Totals                                                                                  $83,090,000         991,907           95%
                                                                                        ==============   ==============  ===========
</TABLE>
- ---------------
Notes to Table:
(1)  Acquired for cash of $8,119,000, the assumption of an existing mortgage
     note payable of $2,187,000 and the issuance of common operating partnership
     units having a value of $333,000.
(2)  Acquired for cash of  $11,832,000,  the  assumption  of existing  mortgage
     notes payable of  $17,532,000  and the issuance of common operating
     partnership units having a value of $700,000.
(3)  Acquired for cash.

                                       1
<PAGE>


Item 7. Financial Statements and Exhibits

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

         Monroe/Lafayette Properties

         o Report of Independent Auditors

         o Combined  Statements of Certain Revenues and Certain Expenses for the
           nine months ended  September  30, 1999  (unaudited)  and for the year
           ended  December  31, 1998

         o Notes to Combined Statements of Certain Revenues and Certain Expenses

         Kohm Properties

         o Report of  Independent  Auditors

         o Combined  Statements of Certain Revenues and Certain Expenses for the
           nine months ended  September  30, 1999  (unaudited)  and for the year
           ended December 31, 1998

         o Notes to Combined Statements of Certain Revenues and Certain Expenses

         Northpointe Property

         o Report of Independent Auditors

         o Statements of Certain Revenues and Certain Operating Expenses for the
           nine months ended  September  30, 1999  (unaudited)  and for the year
           ended December 31, 1998

         o Notes  to  Statements  of  Certain  Revenues  and  Certain  Operating
           Expenses

         R&B Properties

         o Report of Independent Auditors

         o Combined   Statements  of  Certain  Revenues  and  Certain  Operating
           Expenses for the nine months ended September 30, 1999 (unaudited) and
           for the year ended December 31, 1998

         o Notes  to  Combined   Statements  of  Certain  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: March 10, 2000                                      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 certain  revenues and
certain  expenses  of the  Monroe/Lafayette  Properties  (as  defined in Note 1)
("Statement")  for the year  ended  December  31,  1998.  The  Statement  is the
responsibility   of   the   Monroe/Lafayette    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 auditing standards  generally accepted
in the United States. 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 certain revenues and
certain expenses of the Monroe/Lafayette  Properties for the year ended December
31, 1998, in conformity with  accounting  principles  generally  accepted in the
United States.



                                                               ERNST & YOUNG LLP


Los Angeles, California
August 13, 1999



                                       4
<PAGE>


                           MONROE/LAFAYETTE PROPERTIES
          Combined Statements of Certain Revenues and Certain Expenses

<TABLE>

           <S>                                                              <C>                   <C>
                                                                             Nine months ended       Year ended
                                                                             September 30, 1999   December 31, 1998
                                                                            -------------------   -----------------
                                                                                (Unaudited)

           Certain rental revenues................................          $    1,182,000        $    1,267,000
           Certain operating expenses.............................                (289,000)             (427,000)
           Interest expense.......................................                (130,000)             (184,000)
                                                                            -------------------   -----------------
           Certain rental revenues in excess of certain expenses..          $      763,000        $      656,000
                                                                            ===================   =================
</TABLE>


                             See accompanying notes
                                       5

<PAGE>




                           MONROE/LAFAYETTE PROPERTIES
      Notes to Combined Statements of Certain Revenues and Certain Expenses


1.       Background and Basis of Combination

         The  accompanying  combined  statements of certain revenues and certain
         expenses  include the  accounts of two  properties  located in Northern
         Virginia (collectively  "Monroe/Lafayette  Properties") and acquired by
         PS Business  Parks,  Inc.  ("PSB") on January 29, 1999.  The properties
         were owned by different owners but have a common property manager.  The
         combined  statements  are prepared in order to comply with Rule 3.14 of
         Regulation S-X of the Securities and Exchange Commission.

         The  combined  statements  of certain  revenues  and  certain  expenses
         include  only  the  accounts  and  activities  of the  Monroe/Lafayette
         Properties.  Items that are not comparable to the future  operations of
         the Monroe/Lafayette  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  Monroe/Lafayette   Properties  were
         acquired from unaffiliated  parties and (ii) based on the investigation
         of the  Monroe/Lafayette  Properties by PSB, management is not aware of
         any material factors relating to the  Monroe/Lafayette  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  Monroe/Lafayette  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  Monroe/Lafayette  Properties,
         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 1998 and the nine months ended September 30, 1999.

2.       Summary of Significant Accounting Policies

         Revenue Recognition

         The  Monroe/Lafayette  Properties lease space to tenants for which they
         charge minimum rents and receive  reimbursement  for certain  operating
         expenses.  The leases are  accounted  for as  operating  leases and are
         non-cancelable with varying terms and expiration dates. 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 certain  revenues and
         certain  expenses in conformity  with accounting  principles  generally
         accepted in the United States requires management to make estimates and
         assumptions that affect the amounts reported in the combined statements
         of certain revenues and certain expenses and accompanying notes. Actual
         results could differ from those estimates.

3.       Mortgage Debt

         One of the properties provides collateral for a mortgage  note  with an
         outstanding  balance at December 31, 1998 of  $2,193,000.  The mortgage
         note bears interest at 8.0% and is due in April 2003.


                                       6

<PAGE>


                         REPORT OF INDEPENDENT AUDITORS


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


We have audited the  accompanying  combined  statement  of certain  revenues and
certain expenses of the Kohm Properties (as defined in Note 1) ("Statement") for
the year ended  December 31, 1998.  The Statement is the  responsibility  of the
Kohm 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 auditing standards  generally accepted
in the United States. 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 certain revenues and
certain expenses of the Kohm Properties for the year ended December 31, 1998, in
conformity with accounting principles generally accepted in the United States.



                                                               ERNST & YOUNG LLP


Los Angeles, California
August 23, 1999




                                       7
<PAGE>


                               THE KOHM PROPERTIES
          Combined Statements of Certain Revenues and Certain Expenses

<TABLE>

           <S>                                                              <C>                   <C>
                                                                             Nine months ended       Year ended
                                                                             September 30, 1999   December 31, 1998
                                                                            -------------------   -----------------
                                                                                (Unaudited)

           Certain rental revenues................................          $    2,698,000        $    2,956,000
           Certain operating expenses.............................                (668,000)             (878,000)
           Interest expense.......................................                (924,000)             (826,000)
                                                                            -------------------   -----------------
           Certain rental revenues in excess of certain expenses..          $    1,106,000        $    1,252,000
                                                                            ===================   =================


</TABLE>

                             See accompanying notes
                                       8
<PAGE>




                               THE KOHM PROPERTIES
      Notes to Combined Statements of Certain Revenues and Certain Expenses


1.       Background and Basis for Presentation

         The  accompanying  combined  statements of certain revenues and certain
         expenses  include the accounts of four  properties  located in Northern
         Virginia  (collectively  "Kohm Properties") and acquired by PS Business
         Parks,  Inc.  ("PSB") on June 30, 1999.  The  properties  were owned by
         different  owners  but have a common  property  manager.  The  combined
         statements are prepared in order to comply with Rule 3.14 of Regulation
         S-X of the Securities and Exchange Commission.

         The  combined  statements  of certain  revenues  and  certain  expenses
         include only the accounts and activities of the Kohm Properties.  Items
         that are not comparable to the future operations of the Kohm Properties
         have been  excluded.  Such items  include  depreciation,  amortization,
         management fees,  interest  income,  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  Kohm  Properties  were  acquired  from  unaffiliated
         parties and (ii) based on the  investigation  of the Kohm Properties by
         PSB,  management is not aware of any material  factors  relating to the
         Kohm 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 Kohm  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  Kohm  Properties,  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 1998 and the nine months ended September 30, 1999.

2.       Summary of Significant Accounting Policies

         Revenue Recognition

         The Kohm  Properties  lease  space to  tenants  for which  they  charge
         minimum rents and receive reimbursement for certain operating expenses.
         The leases are accounted for as operating leases and are non-cancelable
         with varying terms and expiration  dates.  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 certain  revenues and
         certain  expenses in conformity  with accounting  principles  generally
         accepted in the United States requires management to make estimates and
         assumptions that affect the amounts reported in the combined statements
         of certain revenues and certain expenses and accompanying notes. Actual
         results could differ from those estimates.

3.       Mortgage Debt

         The  Kohm  Properties   provide  collateral  for  mortgage  notes  with
         outstanding balances at December 31, 1998 of $4,414,000 and $6,835,000.
         The mortgage notes bear interest at 7.28% and 8.19%, respectively,  and
         are due in February 2003 and March 2007, respectively.



                                       9

<PAGE>



                         REPORT OF INDEPENDENT AUDITORS


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


We have  audited the  accompanying  statement  of certain  revenues  and certain
operating  expenses  of  the  Northpointe   Property  (as  defined  in  Note  1)
("Statement")  for the year  ended  December  31,  1998.  The  Statement  is the
responsibility of the Northpointe 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 auditing standards  generally accepted
in the United States. 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  certain  revenues and certain
operating  expenses of the Northpointe  Property for the year ended December 31,
1998, in conformity with accounting  principles generally accepted in the United
States.



                                                               ERNST & YOUNG LLP



Los Angeles, California
October 27, 1999



                                       10
<PAGE>




                            THE NORTHPOINTE PROPERTY
          Statements of Certain Revenues and Certain Operating Expenses

<TABLE>

           <S>                                                              <C>                   <C>
                                                                            Nine months ended      Year ended
                                                                            September 30, 1999   December 31, 1998
                                                                            ------------------- -------------------
                                                                                (Unaudited)

           Certain rental revenues..................................        $    2,042,000        $    2,494,000
           Certain operating expenses...............................              (650,000)             (889,000)
                                                                            -------------------   -----------------
           Certain rental revenues in excess of certain operating
                expenses............................................        $    1,392,000        $    1,605,000
                                                                            ===================   =================

</TABLE>


                             See accompanying notes
                                       11
<PAGE>


                            THE NORTHPOINTE PROPERTY
     Notes to Statements of Certain Revenues and Certain Operating Expenses


1.       Background and Basis for Presentation

         The accompanying  statements of certain revenues and certain  operating
         expenses  include the accounts of the Northpointe  Property  located in
         California and acquired by PS Business Parks,  Inc. ("PSB") on July 30,
         1999.  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 certain  revenues  and certain  operating  expenses
         include only the accounts and activities of the  Northpointe  Property.
         Items  that  are  not  comparable  to  the  future  operations  of  the
         Northpointe   Property   have  been   excluded.   Such  items   include
         depreciation,   amortization,   management   fees,   interest   income,
         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 Northpointe Property was acquired from an unaffiliated
         party and (ii) based on the  investigation of the Northpointe  Property
         by PSB, management is not aware of any material factors relating to the
         Northpointe 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 Northpointe 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  Northpointe  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 1998 and the nine months ended September 30, 1999.

2.       Summary of Significant Accounting Policies

         Revenue Recognition

         The Northpointe  Property leases space to tenants for which they charge
         minimum rents and receive reimbursement for certain operating expenses.
         The leases are accounted for as operating leases and are non-cancelable
         with varying terms and expiration  dates.  Recoveries  from tenants are
         recognized as income in the period the applicable costs are accrued.

         Use of Estimates

         The  preparation  of the  statements  of certain  revenues  and certain
         operating expenses in conformity with accounting  principles  generally
         accepted in the United States requires management to make estimates and
         assumptions  that affect the  amounts  reported  in the  statements  of
         certain revenues and certain operating expenses and accompanying notes.
         Actual results could differ from those estimates.



                                       12
<PAGE>


                         REPORT OF INDEPENDENT AUDITORS


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


We have audited the  accompanying  combined  statement  of certain  revenues and
certain  operating  expenses  of the  R&B  Properties  (as  defined  in  Note 1)
("Statement")  for the year  ended  December  31,  1998.  The  Statement  is the
responsibility  of the R&B  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 auditing standards  generally accepted
in the United States. 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 certain revenues and
certain operating expenses of the R&B Properties for the year ended December 31,
1998, in conformity with accounting  principles generally accepted in the United
States.



                                                               ERNST & YOUNG LLP


Los Angeles, California
January 14, 2000


                                       13
<PAGE>


                                 R&B PROPERTIES
     Combined Statements of Certain Revenues and Certain Operating Expenses


<TABLE>

           <S>                                                              <C>                   <C>

                                                                              Nine months ended       Year ended
                                                                             September 30, 1999   December 31, 1998
                                                                            -------------------   -----------------
                                                                                (Unaudited)

           Certain rental revenues..................................        $    2,824,000        $    3,519,000
           Certain operating expenses...............................            (1,030,000)           (1,371,000)
                                                                            -------------------   -----------------
           Certain rental revenues in excess of certain operating
                expenses............................................        $    1,794,000        $    2,148,000
                                                                            ===================   =================

</TABLE>

                             See accompanying notes
                                       14
<PAGE>




                                 R&B PROPERTIES
 Notes to Combined Statements of Certain Revenues and Certain Operating Expenses


1.       Background and Basis for Presentation

         The  accompanying  combined  statements of certain revenues and certain
         operating  expenses  include the accounts of two properties  located in
         Arizona and Texas and acquired by PS Business  Parks,  Inc.  ("PSB") on
         December 30, 1999.  The statements are prepared in order to comply with
         Rule 3.14 of Regulation S-X of the Securities and Exchange Commission.

         The  combined  statements  of certain  revenues  and certain  operating
         expenses   include  only  the  accounts  and   activities  of  the  R&B
         Properties.  Items that are not comparable to the future  operations of
         the R&B Properties have been excluded. Such items include depreciation,
         amortization,  management  fees,  interest income,  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 R&B  Properties  were acquired  from an  unaffiliated
         party and (ii) based on the investigation of the R&B Properties by PSB,
         management  is not aware of any  material  factors  relating to the R&B
         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 R&B  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 R&B Properties, 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 1998
         and the nine months ended September 30, 1999.

2.       Summary of Significant Accounting Policies

         Revenue Recognition

         The R&B Properties lease space to tenants for which they charge minimum
         rents and receive  reimbursements for certain operating  expenses.  The
         leases of the R&B Properties are accounted for as operating  leases and
         are non-cancelable with varying terms and expiration dates.  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 certain  revenues and
         certain  operating  expenses in conformity with  accounting  principles
         generally  accepted in the United  States  requires  management to make
         estimates  and  assumptions  that  affect the  amounts  reported in the
         combined  statements of certain revenues and certain operating expenses
         and  accompanying  notes.    Actual  results  could  differ from  those
         estimates.



                                       15
<PAGE>



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


PS Business  Parks,  Inc.  ("PSB" or the "Company") is the successor to American
Office Park Properties,  Inc. ("AOPP") which merged with and into Public Storage
Properties XI, Inc. ("PSP11") on March 17, 1998 (the "Merger").  The name of the
Company was changed to "PS Business Parks, Inc." in connection with the Merger.

Based upon the terms of the merger (see below),  the  transaction  for financial
reporting  and  accounting   purposes  has  been  accounted  for  as  a  reverse
acquisition whereby AOPP 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 or the Company for periods prior to March 17, 1998 shall 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 January 29, 1999 through December
30, 1999.  During that period,  PSB acquired nine commercial  properties and two
parcels of vacant land located in Northern Virginia, Northern California,  Texas
and Arizona for an aggregate cost of approximately  $83 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,  proceeds  from the  issuance of
preferred stock and preferred units in its operating  partnership in addition to
the assumption of existing mortgage notes payable totaling $19,719,000.

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:

         o Each  outstanding  share of PSP11 common  stock,  which did not elect
           cash,  continued to be owned by current  holders.  A total of 106,155
           PSP11 common shares elected to receive cash of $20.50 per share.

         o Each  share of PSP11  common  stock  Series B and each share of PSP11
           common  stock Series C converted  into 0.8641  shares of PSP11 common
           stock.

         o Each share of AOPP common stock  converted  into 1.18 shares of PSP11
           common stock.

         o Concurrent with the Merger,  PSP11 exchanged 11  mini-warehouses  and
           two properties that combine  mini-warehouse and commercial space (the
           "Exchange")  for 11 commercial  properties  owned by Public  Storage,
           Inc. ("PSI").  The fair value of each group of real estate facilities
           was approximately $48 million.

The Merger has been  accounted for as a reverse merger whereby PSB is treated as
the acquirer using the purchase method.  This has been determined based upon the
following: (i) the former shareholders and unitholders of PSB owned in excess of
80% of the  merged  companies  and  (ii) 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
had been primarily on the ownership and operation of its self-storage facilities
which represented approximately 81% of its portfolio.


                                       16
<PAGE>


In addition to adjustments to reflect the recently  acquired  properties and the
Merger,  pro forma  adjustments were made to reflect the following  transactions
(all common share and common operating partnership ("OP") unit amounts have been
adjusted to reflect the conversion factor of 1.18 pursuant to the Merger):

         1.   In January  1998,  PSB entered into an  agreement  with a group of
              institutional  investors  under  which  PSB  agreed to issue up to
              6,744,072  shares of common  stock at $22.88 per share in cash (an
              aggregate  of  $155  million)  in  separate  tranches.  The  first
              tranche,  representing  2,185,187 shares or $50 million was issued
              in January 1998.  The  remainder of the common  shares  (4,588,885
              shares)  was  issued  on May 6,  1998 and the net  proceeds  ($105
              million)  were used to fund a portion of the cost to  acquire  the
              Principal Properties.

         2.   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 $193,000.

         3.   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 assumption of existing  mortgage notes
              payable of $14,526,000  and the issuance of 44,250 OP units having
              a value of $1,013,000.

         4.   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  through the use of  available  cash and
              borrowings from an affiliate.

         5.   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.  Proceeds  were  used  to  pay  off
              borrowings from an affiliate.

         6.   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  assumption of existing  mortgage notes
              payable of $3,678,000  and the issuance of 8,882 OP units having a
              value of $203,000.

         7.   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 $11,777,000.

         8.   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 $156,000.

         9.   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.

        10.   On December 31, 1998, PSB acquired six  commercial  properties and
              subsequently acquired six additional commercial properties and two
              newly developed properties  (collectively referred to as the "Hill
              Properties")  on January 6, 1999 and May 31,  1999,  respectively,
              from   unaffiliated   third  parties  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.

        11.   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.


                                       17
<PAGE>


        12.    On  April 23,  1999,   the   Operating  Partnership  completed  a
               private  placement  of 510,000  preferred  units with a preferred
               distribution rate  of 8 7/8%. The net proceeds from the placement
               of  preferred  units were  approximately  $12.5  million and were
               used to repay borrowings from an affiliate.

        13.    On  April 30, 1998, PSB  issued 2,200,000 depositary  shares each
               representing 1/1,000  of a share of 9 1/4%  Cumulative  Preferred
               Stock, Series A. Net proceeds from the public perpetual preferred
               stock offering were approximately  $53.1 million and were used to
               repay  borrowings from an  affiliate  and a mortgage note payable
               of  approximately  $11 million.  The remaining proceeds were used
               for investment in real estate.

        14.    On  September 3, 1999,  the  Operating  Partnership  completed  a
               private placement of 3,200,000 preferred units with  a  preferred
               distribution rate of 8 3/4%.  The net proceeds from the placement
               of  preferred units were approximately $78 million.  A portion of
               the proceeds will be used to  prepay  a  mortgage note payable of
               approximately $8.5 million and the remaining portion will be used
               to finance future acquisitions.

        15.    On September 7 and 23, 1999,  the Operating Partnership completed
               private  placements  of  1,200,000  and  400,000 preferred units,
               respectively, with a  preferred distribution rate of 8 7/8%.  The
               net   proceeds  from  the   placement  of  preferred  units  were
               approximately  $39.2 million and will be  used to  finance future
               acquisitions.


The pro forma consolidated balance sheet at September 30, 1999 has been prepared
to  reflect  the  subsequent  acquisitions  of  commercial  properties  and  the
prepayment of a mortgage note payable from the proceeds of the preferred OP unit
offerings.

The pro  forma  consolidated  statement  of  income  for the nine  months  ended
September   30,  1999  has  been  prepared   assuming  (i)  the   aforementioned
acquisitions  of  commercial  properties  and  (ii) the  aforementioned  private
placements  of  preferred  OP units and public  offering  of  depositary  shares
representing fractional interest in preferred stock, as if all such transactions
were  completed at the beginning of fiscal 1999.  The operations of all property
acquisitions are based on the historical operating results for 1999.

The pro forma  consolidated  statement of income for the year ended December 31,
1998  has  been  prepared  assuming  (i)  the  aforementioned   acquisitions  of
commercial  properties,  (ii) the  aforementioned  issuance  of common  stock to
institutional and public  investors,  (iii) the Merger between PSB and PSP11 and
(iv) the  aforementioned  private  placements  of  preferred OP units and public
offering of  depositary  shares  representing  fractional  interest in preferred
stock,  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  statements  of income for the nine  months and year
ended  December 31, 1999 and 1998,  respectively,  do not include income derived
from uninvested cash of approximately $88 million.

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 PSB and PSP11 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 PSB, PSP11 and
other  documents  filed  by PSB and  PSP11  with  the  Securities  and  Exchange
Commission (such as Form 8-K's which reference property  acquisitions) from time
to time.  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 had in fact occurred at the beginning of the dates indicated
or to project PSB's results of operations for any future date or period.


                                       18
<PAGE>


                             PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                               September 30, 1999
                                   (Unaudited)
                  (Amounts in thousands, except per share data)


<TABLE>
<S>                                                             <C>                <C>                   <C>
                                                                      PSB            Acquisitions              PSB
                                                                  (Historical)          (Note 1)            (Pro Forma)
                                                                ----------------   -----------------     ----------------
                           ASSETS

Cash and cash equivalents.................................      $       118,988    $       (31,110)      $        87,878
Real estate facilities, net of accumulated depreciation...              772,005             22,556               794,561
Construction in progress..................................                7,137                  -                 7,137
Intangible assets, net of accumulated amortization........                1,357                  -                 1,357
Receivables and other assets..............................                6,900                  -                 6,900
                                                                ----------------   -----------------     ----------------
     Total assets.........................................      $       906,387    $        (8,554)      $       897,833
                                                                ================   =================     ================


            LIABILITIES AND SHAREHOLDERS' EQUITY



Accrued and other liabilities.............................      $        19,210    $             -       $        19,210
Mortgage notes payable....................................               45,828             (8,554)               37,274

Minority interests:
   Preferred units........................................              132,750                  -               132,750
   Common units...........................................              156,210                  -               156,210


Shareholders' equity:
   Preferred  stock,  $0.01  par  value,   50,000,000  shares
      authorized,  2,200  shares  issued and  outstanding  at
      September 30, 1999..................................               55,000                  -                55,000
   Common  stock,   $0.01  par  value,   100,000,000   shares
      authorized,  23,645,461  shares issued and  outstanding
      at September 30, 1999...............................                  236                  -                   236
   Paid-in capital........................................              479,466                  -               479,466
   Cumulative net income..................................               62,906                  -                62,906
   Cumulative distributions...............................              (45,219)                 -               (45,219)
                                                                ----------------   -----------------     ----------------
       Total shareholders' equity.........................              552,389                  -               552,389
                                                                ----------------   -----------------     ----------------
   Total liabilities and shareholders' equity.............      $       906,387    $        (8,554)      $       897,833
                                                                ================   =================     ================


Book value per common share (Note 2)......................      $         21.04                          $         21.04
                                                                ================                         ================
Shares outstanding........................................           23,645,000                               23,645,000
                                                                ================                         ================


</TABLE>

        See Accompanying Notes to Pro Forma Consolidated Balance Sheet.
                                       19

<PAGE>


                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                               September 30, 1999
                                   (Unaudited)
<TABLE>
<CAPTION>


1.       Property Acquisitions
         ---------------------

        <S>                                                                                      <C>

         On December 30, 1999, PSB acquired two commercial  properties (the "R&B
         Properties") from an unaffiliated  third party for an aggregate cost of
         approximately $22,556,000 in cash.

         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated balance sheet to reflect the aforementioned transaction as
         if these properties had been owned by PSB as of September 30, 1999.

        o  Cash and cash equivalents have been adjusted to reflect:
           o  the acquisition cost of the facilities acquired................................    $   (22,556,000)
           o  the  prepayment  of a mortgage  note payable from the proceeds of the preferred
              OP unit offerings..............................................................         (8,554,000)
                                                                                                 ----------------
                                                                                                 $   (31,110,000)
                                                                                                 ================

        o  A pro forma  adjustment has been made to real estate  facilities to reflect the
           acquisition cost of the facilities acquired.......................................    $    22,556,000
                                                                                                 ================

        o  A pro forma  adjustment  has been made to reflect the  prepayment of a mortgage
           note payable from the proceeds of the preferred OP unit offerings.................    $    (8,554,000)
                                                                                                 ================

2.       Book value per common share
         ---------------------------

         Book value per  common  share has been  determined  by  dividing  total
         common  shareholders'  equity by the  outstanding  common  shares.  The
         following summarizes the common shares outstanding:

                                                                                                  Common shares
                                                                                                   outstanding
                                                                                                 ----------------

        o PSB historical shares outstanding at September 30, 1999............................         23,645,461


</TABLE>


                                       20
<PAGE>



                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For the Nine Months Ended September 30, 1999
                                   (Unaudited)
                  (Amounts in thousands, except per share data)

<TABLE>

               <S>                                            <C>               <C>                <C>              <C>

                                                                                 Acquisition of
                                                                                Real Estate from        Other
                                                                   PSB           Third Parties       Adjustments         PSB
                                                              (Historical)         (Note 1)           (Note 2)       (Pro forma)
                                                              -------------     ----------------   -------------    -------------
               Revenues:
                  Rental income............................   $     92,544      $      6,153       $         -      $     98,697
                  Facility management fees from affiliates.            351                 -                 -               351
                  Interest and other income................            885                 -                 -               885
                                                              -------------     ----------------   -------------    -------------
                                                                    93,780             6,153                 -            99,933
                                                              -------------     ----------------   -------------    -------------

               Expenses:
                  Cost of operations.......................         25,951             1,986                 -            27,937
                  Cost of facility management..............             70                 -                 -                70
                  Depreciation and amortization............         21,641             2,658                 -            24,299
                  General and administrative...............          2,339                 -                 -             2,339
                  Interest expense.........................          2,658               660              (986)            2,332
                                                              -------------     ----------------   -------------    -------------
                                                                    52,659             5,304              (986)           56,977
                                                              -------------     ----------------   -------------    -------------

               Income before minority interest in income...         41,121               849               986            42,956
                  Minority interest in income - preferred
                  units (Note 6)...........................         (1,236)                -            (7,524)           (8,760)
                  Minority interest in income - common
                  units (Note 6)...........................         (9,533)             (203)            1,965            (7,771)
                                                              -------------     ----------------   -------------    -------------
               Net income (loss)...........................   $     30,352      $        646       $    (4,573)     $     26,425
                                                              =============     ================   =============    =============


               Net income (loss) allocation:
                  Allocable to preferred shareholders......   $      2,134      $          -       $     1,682      $      3,816
                  Allocable to common shareholders.........         28,218               646            (6,255)           22,609
                                                              -------------     ----------------   -------------    -------------
                                                              $     30,352      $        646       $    (4,573)     $     26,425
                                                              =============     ================   =============    =============

               Net income per common share (Notes 3 and 5):
                    Basic..................................   $      1.19                                           $       0.96
                                                              =============                                         =============
                    Diluted................................   $      1.19                                           $       0.95
                                                              =============                                         =============

               Weighted average common shares outstanding
               (Notes 3 and 5):
                    Basic..................................         23,639                                                23,639
                                                              =============                                         =============
                    Diluted................................         23,713                                                23,713
                                                              =============                                         =============



</TABLE>

     See Accompanying Notes to Pro Forma Consolidated Statements of Income.
                                       21
<PAGE>





                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For the Year Ended December 31, 1998
                                   (Unaudited)
                  (Amounts in thousands, except per share data)


<TABLE>
<S>                                                  <C>               <C>                <C>            <C>
                                                                                   Pro Forma
                                                                             Pre-Merger Adjustments
                                                                             ----------------------
                                                                        Acquisition of
                                                                       Real Estate from        Other         PSB
                                                          PSB            Third Parties      Adjustments   Pre-Merger
                                                      (Historical)         (Note 1)          (Note 2)     (Pro forma)
                                                     -------------     ----------------   -------------  -------------
Revenues:
   Rental income:
     Commercial properties.......................    $     88,320      $     28,199       $         -    $    116,519
     Mini-warehouse properties...................               -                 -                 -               -
   Facility management fees......................             529                 -                 -             529
   Interest and other income.....................           1,411                 -                 -           1,411
                                                     -------------     ----------------   -------------  -------------
                                                           90,260            28,199                 -         118,459
                                                     -------------     ----------------   -------------  -------------
Expenses:
   Cost of operations:
     Commercial properties.......................          26,073             7,300                 -          33,373
     Mini-warehouse properties...................               -                 -                 -               -
   Cost of managing facilities...................              77                 -                 -              77
   Depreciation and amortization.................          18,908            10,719                 -          29,627
   General and administrative....................           2,233                 -               225           2,458
   Interest expense..............................           2,361             2,547            (1,227)          3,681
                                                     -------------     ----------------   -------------  -------------
                                                           49,652            20,566            (1,002)         69,216
                                                     -------------     ----------------   -------------  -------------
Income before minority interests................          40,608             7,633             1,002          49,243
   Minority interest in income - preferred units                -                 -           (11,682)        (11,682)
   (Note 6)
   Minority interest in income - common units             (11,208)           (1,832)            3,784          (9,256)
   (Note 6)                                          -------------     ----------------   -------------  -------------
Net income (loss)................................    $     29,400      $      5,801       $    (6,896)   $     28,305
                                                     =============     ================   =============  =============
Net income (loss) allocation:
   Allocable to preferred shareholders...........    $          -      $          -       $     5,088    $      5,088
   Allocable to common shareholders..............          29,400             5,801           (11,984)         23,217
                                                     -------------     ----------------   -------------  -------------
                                                     $     29,400      $      5,801       $    (6,896)   $     28,305
                                                     =============     ================   =============  =============

Net income per common share (Notes 3 and 5):
     Basic.......................................    $       1.52                                        $       1.00
                                                     =============                                       =============
     Diluted.....................................    $       1.51                                        $       1.00
                                                     =============                                       =============
Weighted average common shares outstanding
(Notes 3 and 5):
     Basic.......................................          19,361                                              23,155
                                                     =============                                       =============
     Diluted.....................................          19,429                                              23,223
                                                     =============                                       =============
</TABLE>

     See Accompanying Notes to Pro Forma Consolidated Statements of Income.
                                       22
<PAGE>


                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For the Year Ended December 31, 1998
                                   (Unaudited)
                  (Amounts in thousands, except per share data)


<TABLE>

<S>                                                  <C>               <C>                <C>
                                                                          Pro Forma
                                                                      Merger Adjustments
                                                                      ------------------
                                                                       Exchange of Real        PSB
                                                        PSB 11        Estate Facilities     Pre-Merger
                                                      (Historical)         (Note 4)        (Pro forma)
                                                     -------------    -----------------   -------------


Revenues:
   Rental income:
     Commercial properties.......................    $        232     $       1,744       $   118,495
     Mini-warehouse properties...................           1,280            (1,280)                -
   Facility management fees......................               -               (99)              430
   Interest and other income.....................               -                 -             1,411
                                                     -------------    -----------------   -------------
                                                            1,512               365           120,336
                                                     -------------    -----------------   -------------
Expenses:
   Cost of operations:
     Commercial properties.......................              86               666            34,125
     Mini-warehouse properties...................             434              (434)                -
   Cost of managing facilities...................               -               (13)               64
   Depreciation and amortization.................             250                85            29,962
   General and administrative....................              36                 -             2,494
   Interest expense..............................               -                 -             3,681
                                                     -------------    -----------------   -------------
                                                              806               304            70,326
                                                     -------------    -----------------   -------------
Income before minority interests.................             706                61            50,010
   Minority interest in income - preferred units                -                 -           (11,682)
   (Note 6)
   Minority interest in income - common units                (169)              (15)           (9,440)
   (Note 6)                                          -------------    -----------------   -------------
Net income (loss)................................    $        537     $          46       $    28,888
                                                     =============    =================   =============
Net income (loss) allocation:
   Allocable to preferred shareholders...........    $          -     $           -       $     5,088
   Allocable to common shareholders..............             537                46            23,800
                                                     -------------    -----------------   -------------
                                                     $        537     $          46       $    28,888
                                                     =============    =================   =============

Net income per common share (Notes 3 and 5):
     Basic.......................................                                         $      1.01
                                                                                          =============
     Diluted.....................................                                         $      1.00
                                                                                          =============
Weighted average common shares outstanding
(Notes 3 and 5):
     Basic.......................................                                              23,631
                                                                                          =============
     Diluted.....................................                                              23,699
                                                                                          =============
</TABLE>

     See Accompanying Notes to Pro Forma Consolidated Statements of Income.
                                       23
<PAGE>



                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 1998
                                   (Unaudited)


1.       Acquisition of Real Estate Facilities from Third Parties
         --------------------------------------------------------

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

<TABLE>

       <S>                                                                    <C>                   <C>
                                                                              Nine months ended        Year ended
                                                                              September 30, 1999    December 31, 1998
                                                                              ------------------    -----------------
        o  Rental income has been adjusted to reflect:                                 (Amounts in thousands)
           o  the pro forma rental income as if the acquired properties
              were owned by PSB for the periods presented:
                     Ammendale Property...................................    $            -        $        3,235
                     March Acquisitions Properties........................                 -                 4,113
                     Principal Properties.................................                 -                23,377
                     Northpointe Properties...............................                 -                   950
                     Gunston Property ....................................                 -                 2,430
                     Spectrum 95 Property.................................                 -                   768
                     Royal Tech 15 Property...............................                 -                    93
                     Las Plumas Property .................................                 -                 2,369
                     Hill Properties......................................             1,855                 4,779
                     Monroe/Lafayette Properties..........................             1,182                 1,267
                     Kohm Properties......................................             2,698                 2,956
                     Northpointe Property.................................             2,042                 2,494
                     R&B Properties.......................................             2,824                 3,519
           o  the rental income of these  properties  which are already
              included in PSB's historical amounts........................            (4,448)              (24,151)
                                                                              ------------------    -----------------
                                                                              $        6,153        $       28,199
                                                                              ==================    =================
        o  Cost of operations has been adjusted to reflect:
           o  the pro  forma  cost  of  operations  as if the  acquired
              properties were owned by PSB for the periods presented:
                     Ammendale Property...................................    $            -        $          818
                     March Acquisitions Properties........................                 -                 1,071
                     Principal Properties.................................                 -                 5,301
                     Northpointe Properties...............................                 -                   174
                     Gunston Property.....................................                 -                   270
                     Spectrum 95 Property.................................                 -                   192
                     Royal Tech 15 Property...............................                 -                    10
                     Las Plumas Property .................................                 -                   440
                     Hill Properties .....................................               527                 1,073
                     Monroe/Lafayette Properties..........................               289                   427
                     Kohm Properties......................................               668                   878
                     Northpointe Property.................................               650                   889
                     R&B Properties.......................................             1,030                 1,371
           o  the cost of  operations  of these  properties  which  are
              already included in PSB's historical amounts................            (1,178)               (5,614)
                                                                              ------------------    -----------------
                                                                              $        1,986        $        7,300
                                                                              ==================    =================

</TABLE>

                                       24
<PAGE>


                             PS BUSINESS PARKS, INC.

              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 1998
                                   (Unaudited)

<TABLE>
        <S>                                                                   <C>                   <C>
                                                                              Nine months ended        Year ended
                                                                              September 30, 1999    December 31, 1998
                                                                              ------------------    -----------------
                                                                                       (Amounts in thousands)
        o  A  pro  forma   adjustment  has  been  made  to  reflect  the
           incremental  depreciation  expense of the acquired properties
           as if they were owned by PSB for the periods presented.........    $        2,658        $       10,719
                                                                              ==================    =================

        o  A  pro forma   adjustment  has  been  made  to reflect  the
           incremental  interest  expense  as  if the  mortgage  notes
           associated with the acquired properties were assumed at the
           beginning of the periods presented.............................    $          660        $        2,547
                                                                              ==================    =================

        o  Minority   interest   in  income   allocable   to  common
           unitholders  has   been  adjusted   based  upon  its  pro
           rata ownership interest in the pro forma adjustments above.....    $         (203)       $       (1,832)
                                                                              ==================    =================

2.       Other Pro Forma Adjustments
         ---------------------------

        o  General  and  administrative  expense  has  been  adjusted to
           reflect  additional  payroll  costs  associated  with  hiring
           acquisition and executive personnel............................    $            -        $          225
                                                                              ==================    =================

        o  Interest  expense   has   been   adjusted   to   reflect   the
           following transactions as if the proceeds from the issuance of
           common shares, preferred shares  and  preferred  OP units were
           available at the beginning of the periods presented:
           o  the prepayment of a mortgage note payable...................    $         (543)       $         (736)
           o  the paydown of the Company's line of credit.................               (72)                    -
           o  the  paydown  of the  Company's  borrowings  from  Public
              Storage, Inc................................................              (371)                 (491)
                                                                              ------------------    -----------------
                                                                              $         (986)       $       (1,227)
                                                                              ==================    =================

        o  Minority interest in income allocable to preferred unitholders
           has  been  adjusted  to  reflect  the   incremental  preferred
           distributions if the  preferred  OP unit  offerings  had  been
           completed at the beginning of the periods presented............    $       (7,524)       $      (11,682)
                                                                              ==================    =================

        o  Minority   interest   in  income   allocable   to  common
           unitholders has been adjusted  based  upon  its pro  rata
           ownership interest in the above pro forma adjustments..........    $        1,965        $        3,784
                                                                              ==================    =================

        o  Net  income  allocable to preferred  shareholders has been
           adjusted to reflect the incremental preferred dividends as
           if the preferred  stock offering had been completed at the
           beginning of the periods presented.............................    $        1,682        $        5,088
                                                                              ==================    =================

</TABLE>


                                       25
<PAGE>


                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 1998
                                   (Unaudited)


3.      Net income per common share (Pro Forma in 1999 and Pre-Merger Pro
        -----------------------------------------------------------------
        Forma in 1998) has been computed as follows:
        --------------------------------------------
<TABLE>
        <S>                                                                   <C>                   <C>
                                                                               Nine months ended        Year ended
                                                                              September 30, 1999    December31, 1998
                                                                              ------------------    -----------------
                                                                                       (Amounts in thousands,
                                                                                       except per share data)

        Historical net income allocable to common shareholders...........     $       28,218        $       29,400
                                                                              ==================    =================

        Historical weighted average common shares - basic................             23,639                19,361
             Dilutive effect of stock options............................                 74                    68
                                                                              ------------------    -----------------
        Historical weighted average common shares - diluted..............             23,713                19,429
                                                                              ==================    =================

        Historical net income per common share - basic...................     $         1.19        $         1.52
        Historical net income per common share - diluted.................     $         1.19        $         1.51

        -------------------------------------------------------------------------------------------------------------

        Pro forma net income allocable to common shareholders.                $       22,609        $       23,217
                                                                              ==================    =================

        Historical weighted average common shares - basic................             23,639                19,361
             Issuance  of common  shares to  institutional  investors  in
             January  and  May  1998  (6,774,072  shares  less  5,010,359
             shares which are already included in the historical  amounts
             for the year ended December 31, 1998).......................                  -                 1,764
             Issuance  of  common  shares  to  the  public  in  May  1998
             (5,025,800  shares less  2,996,090  shares which are already
             included  in the  historical  amounts  for  the  year  ended
             December 31, 1998)..........................................                  -                 2,030
                                                                              ------------------    -----------------

         Pro forma weighted average common shares - basic...............              23,639                23,155
             Dilutive effect of stock options............................                 74                    68
                                                                              ------------------    -----------------

         Pro forma weighted average common shares - diluted..............             23,713                23,223
                                                                              ==================    =================

        Pro forma net income per common share - basic....................     $         0.96        $         1.00
        Pro forma net income per common share - diluted..................     $         0.95        $         1.00



</TABLE>


                                       26
<PAGE>


                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 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>                   <C>

                                                                              Nine months ended       Year ended
                                                                              September 30, 1999    December 31, 1998
                                                                              ------------------    -----------------
                                                                                        (Amounts in thousands)
         o Rental  income -  commercial  properties  has been  adjusted
           to  reflect  the  incremental  rental  income  as if the  11
           commercial properties received in the Exchange were owned by
           PSB prior to the Merger........................................    $            -        $        1,744
                                                                              ==================    =================

        o  Rental income - mini-warehouses has been adjusted to eliminate
           the rental  income  of  the  11  mini-warehouse facilities and
           two  properties  that  combine  mini-warehouse  and commercial
           space owned by PSP11 prior to the Merger and Exchange..........    $            -        $       (1,280)
                                                                              ==================    =================

        o  A   pro  forma   adjustment   has   been   made  to  facility
           management fees to:
           o  eliminate   the  historical  facility   management  fees
              associated  with the 11 commercial  properties  received
              in the Exchange as such fee will no longer be charged to
              these properties as PSB will own them.......................    $            -        $          (87)
           o  eliminate  the  historical   facility   management  fees
              associated  with the two commercial  properties acquired
              from PSP11 during the Merger................................                 -                   (12)
                                                                              ------------------    -----------------
                                                                              $            -        $          (99)
                                                                              ==================    =================

        o  A  pro  forma   adjustment  has  been  made  to  cost  of
           operations to:

           o  eliminate historical  management fees paid  to PSB to manage
              the two commercial properties acquired from PSP11 during the
              Merger  which  are  included in  historical amounts and as a
              result of the Merger will no longer be incurred.............    $            -        $          (12)

           o  reflect the incremental cost of operations as if the 11
              commercial  properties received in the Exchange (before
              cost of management) were owned by PSB prior to the Merger...                 -                   665

           o  reflect  the cost of  management  for the two  commercial
              properties  acquired from PSP11 during the Merger and the
              11 commercial properties received in the Exchange...........                 -                    13
                                                                              ------------------    -----------------
                                                                              $            -        $          666
                                                                              ==================    =================

</TABLE>

                                       27
<PAGE>



                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 1998
                                   (Unaudited)


<TABLE>

        <S>                                                                   <C>                   <C>
                                                                              Nine months ended        Year ended
                                                                              September 30, 1999    December 31, 1998
                                                                              ------------------    -----------------
                                                                                       (Amounts in thousands)
        o  Cost  of  operations  -  mini-warehouses  has been  adjusted to
           eliminate  the  cost  of   operations  of  the  11   mini-warehouse
           facilities  and two  properties  that  combine  mini-warehouse  and
           commercial space owned by PSP11 prior to the Merger and
           Exchange.......................................................    $            -        $         (434)
                                                                              ==================    =================

        o  Cost of managing  facilities  has been  adjusted to  eliminate  the
           historical cost of managing the two PSP11 commercial properties and
           the 11 commercial  properties received in the Exchange,  such costs
           are reclassified to
           cost of operations - commercial properties.....................    $            -        $          (13)
                                                                              ==================    =================

        o  Depreciation expense has been adjusted to:
           o  Eliminate the historical  depreciation expense of PSP11's
              facilities..................................................    $            -        $         (248)
           o  Record  depreciation  expense  based on the acquired cost
              of the  remaining  PSP11  facilities  ($48  million  cost,  20%
              allocated to land,  the remaining  cost allocated to buildings,
              depreciated straight-line over 30 years)....................                 -                   333
                                                                              ------------------    -----------------
                                                                              $            -        $           85
                                                                              ==================    =================

        o  Minority   interest   in  income   allocable   to  common
           unitholders  has  been  adjusted  based  upon  its  pro  rata
           ownership interest in the above pro forma adjustments..........    $            -        $          (15)
                                                                              ==================    =================

</TABLE>

                                       28
<PAGE>



                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 1998
                                  (Unaudited)



5.       Net  income  per  share (Pro forma in 1999 and Post-Merger Pro Forma in
         -----------------------------------------------------------------------
         1998) has been computed as follows:
         -----------------------------------

<TABLE>
<CAPTION>
        <S>                                                                   <C>                   <C>
                                                                              Nine months ended        Year ended
                                                                              September 30, 1999    December 31, 1998
                                                                              ------------------    -----------------
                                                                                       (Amounts in thousands,
                                                                                       except per share data)

        Pro forma net income allocable to common shareholders.............    $       22,609        $       23,800
                                                                              ==================    =================

        Pro forma weighted average shares from Note 3 above...............
                                                                                      23,639                23,155
             Issuance  of shares to PSP11's  Series  A common shareholders
             (1,713,782  shares  less 1,356,940  shares  which are already
             included  in  the  historical  amounts  for  the  year  ended
             December 31, 1998)...........................................                 -                   357
             Issuance  of  shares  to  PSP11's   Series  B  and  C  common
             shareholders  (569,656  shares less 451,042  shares which are
             already  included  in the  historical  amounts  for the  year
             ended December 31, 1998).....................................                 -                   119
                                                                              ------------------    -----------------
        Pro forma weighted average common shares -basic...................            23,639                23,631
             Dilutive effect of stock options.............................                74                    68
                                                                              ------------------    -----------------
        Pro forma weighted average common shares - diluted................            23,713                23,699
                                                                              ==================    =================

        Pro forma net income per common share - basic.....................    $         0.96        $         1.01
        Pro forma net income per common share - diluted...................    $         0.95        $         1.00

</TABLE>

                                       29
<PAGE>


                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 1999
                      and the year ended December 31, 1998
                                   (Unaudited)


6.       Minority Interest
         -----------------

         Minority interest represents  ownership interests of common OP units in
         the consolidated  Operating Partnership which are not owned by PSB. The
         common  OP  units,  subject  to  certain  conditions  of the  Operating
         Partnership  Agreement,  are convertible into common shares of PSB on a
         one-for-one   basis.  The  following  table  summarizes  the  ownership
         interests:

<TABLE>
<CAPTION>
        <S>                                                                   <C>                   <C>
                                                                              Nine months ended        Year ended
                                                                              September 30, 1999    December 31, 1998
                                                                              ------------------    -----------------
                                                                                       (Amount in thousands)

        Pro forma weighted average common shares outstanding..............         23,639                23,631
        Pro  forma  weighted   average  common  OP  units  owned  by
          minority interests..............................................          7,443                 7,443
                                                                              ------------------    -----------------
        Pro forma  weighted  average  common shares  outstanding  assuming         31,082                31,074
        conversion of common OP units.....................................    ==================    =================


        Percentage ownership of PSB shares outstanding....................           76.1%                 76.0%
        Percentage ownership of minority interests........................           23.9%                 24.0%
                                                                              ------------------    -----------------
             Total ownership interest.....................................          100.0%                100.0%
                                                                              ==================    =================

</TABLE>

                                       30




                                                                      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.  333-78627)  and the related  prospectus  of (i) our
report dated August 13, 1999 on the combined  statement of certain  revenues and
certain expenses of the Monroe/Lafayette  Properties for the year ended December
31, 1998 included in the Current Report on Form 8-K/A dated December 30, 1999 of
PS Business  Parks,  Inc., (ii) our report dated August 23, 1999 on the combined
statement of certain  revenues and certain  expenses of the Kohm  Properties for
the year ended  December 31, 1998  included in the Current  Report on Form 8-K/A
dated  December  30, 1999 of PS Business  Parks,  Inc.,  (iii) our report  dated
October 27, 1999 on the  statement  of certain  revenues  and certain  operating
expenses  of the  Northpointe  Property  for the year ended  December  31,  1998
included  in the  Current  Report on Form 8-K/A  dated  December  30, 1999 of PS
Business Parks,  Inc. and (iv) our report dated January 14, 2000 on the combined
statement  of  certain  revenues  and  certain  operating  expenses  of the  R&B
Properties  for the year ended  December 31, 1998 included in the Current Report
on Form 8-K/A dated December 30, 1999 of PS Business Parks, Inc.



                                                           /s/ ERNST & YOUNG LLP




Los Angeles, California
March 10, 2000



                                       31




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