PS BUSINESS PARKS INC/CA
10-Q, 1999-11-12
REAL ESTATE INVESTMENT TRUSTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q


[X]  Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934

For the quarterly period ended September 30, 1999

                                       or

[ ]  Transition Report Pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934

For the transition period from _______________ to _______________

Commission File Number 1-10709

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


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


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


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


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports)  and  (2)  has  been  subject  to such  filing
requirements for the past 90 days.

                                    Yes X  No
                                       ---   ---

Number of shares outstanding of each of the issuer's classes of common stock, as
of  November  10,  1999:
Common  Stock,  $0.01  par  value,  23,645,461 shares outstanding

<PAGE>
                             PS BUSINESS PARKS, INC.

                                      INDEX


Page PART I. FINANCIAL INFORMATION

Item 1.   Financial Statements

          Condensed Consolidated Balance Sheets as of September 30, 1999
          and December 31, 1998.........................................       2

          Condensed Consolidated Statements of Income for the Three
          and Nine Months Ended September 30, 1999 and 1998.............       3

          Condensed Consolidated Statement of Shareholders' Equity for
          the Nine Months Ended September 30, 1999......................       4

          Condensed Consolidated Statements of Cash Flows for the Nine
          Months Ended September 30, 1999...............................  5 -  6

          Notes to Condensed Consolidated Financial Statements..........  7 - 16

Item 2.   Management's Discussion and Analysis of Financial Condition
          and Results of Operations..................................... 17 - 25

Item 3.   Quantitative and Qualitative Disclosures About Market Risk....      26

PART II.  OTHER INFORMATION

Item 1.   Legal Proceedings.............................................      27

Item 6.   Exhibits & Reports on Form 8-K................................      27

<PAGE>

                             PS BUSINESS PARKS, INC.
                      CONDENSED CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                           September 30,            December 31,
                                                                                1999                    1998
                                                                          ---------------         ---------------
                                                                            (unaudited)
                                                       ASSETS
                                                       ------
<S>                                                                       <C>                     <C>

Cash and cash equivalents...............................                  $   118,988,000         $     6,068,000

Real estate facilities, at cost:
   Land.................................................                      192,352,000             176,241,000
   Buildings and equipment..............................                      623,585,000             536,697,000
                                                                          ---------------         ---------------
                                                                              815,937,000             712,938,000
   Accumulated depreciation.............................                      (43,932,000)            (22,517,000)
                                                                          ---------------         ---------------
                                                                              772,005,000             690,421,000
Construction in progress................................                        7,137,000               7,716,000
                                                                          ---------------         ---------------
                                                                              779,142,000             698,137,000

Receivables.............................................                          295,000                 242,000
Deferred rent receivables...............................                        4,630,000               2,086,000
Intangible assets, net..................................                        1,357,000               1,583,000
Other assets............................................                        1,975,000               1,298,000
                                                                          ---------------         ---------------
              Total assets..............................                  $   906,387,000         $   709,414,000
                                                                          ===============         ===============


                                        LIABILITIES AND SHAREHOLDERS' EQUITY
                                        ------------------------------------

Accrued and other liabilities...........................                  $    19,210,000         $    15,953,000
Line of credit..........................................                                -              12,500,000
Mortgage notes payable..................................                       45,828,000              38,041,000
                                                                          ---------------         ---------------
         Total liabilities..............................                       65,038,000              66,494,000

Minority interests:
   Preferred units......................................                      132,750,000                       -
   Common units.........................................                      156,210,000             153,015,000

Shareholders' equity:
   Preferred stock, $0.01 par value, 50,000,000
     shares authorized, 2,200 shares issued and
     outstanding at September 30, 1999 (none
     issued and outstanding at December 31, 1998).......                       55,000,000                       -
   Common stock, $0.01 par value, 100,000,000
     shares authorized, 23,645,461 shares issued
     and outstanding at September 30, 1999
     (23,635,650 shares issued and outstanding at
     December 31, 1998).................................                          236,000                 236,000
   Paid-in capital......................................                      479,466,000             482,471,000
   Cumulative net income................................                       62,906,000              32,554,000
   Cumulative distributions.............................                      (45,219,000)            (25,356,000)
                                                                          ---------------         ---------------
         Total shareholders' equity.....................                      552,389,000             489,905,000
                                                                          ---------------         ---------------
            Total liabilities and shareholders'equity...                  $   906,387,000         $   709,414,000
                                                                          ===============         ===============
</TABLE>

                             See accompanying notes.

                                       2
<PAGE>

                             PS BUSINESS PARKS, INC.
                   CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                             For the three months                For the nine months
                                                              ended September 30,                ended September 30,
                                                        --------------------------------   --------------------------------
                                                             1999             1998              1999             1998
                                                        --------------    --------------   --------------    --------------
<S>                                                     <C>               <C>              <C>               <C>

Revenues:
   Rental income.................................       $   32,568,000    $   25,635,000   $   92,544,000    $   61,459,000
   Facility management fees from affiliates......              121,000           109,000          351,000           440,000
   Interest and other income.....................              592,000           533,000          885,000         1,077,000
                                                        --------------    --------------   --------------    --------------
                                                            33,281,000        26,277,000       93,780,000        62,976,000
                                                        --------------    --------------   --------------    --------------
Expenses:
  Cost of operations.............................            8,920,000         7,379,000       25,951,000        18,361,000
  Cost of facility management....................               24,000            12,000           70,000            49,000
  Depreciation and amortization..................            7,594,000         4,865,000       21,641,000        11,421,000
  General and administrative.....................              742,000           593,000        2,339,000         1,589,000
  Interest expense...............................              977,000           667,000        2,658,000         1,736,000
                                                        --------------    --------------   --------------    --------------
                                                            18,257,000        13,516,000       52,659,000        33,156,000
                                                        --------------    --------------   --------------    --------------

Income before minority interest..................           15,024,000        12,761,000       41,121,000        29,820,000

  Minority interest in income - preferred units..           (1,022,000)                -       (1,236,000)                -
  Minority interest in income - common units.....           (3,347,000)       (3,013,000)      (9,533,000)       (8,696,000)
                                                        --------------    --------------   --------------    --------------
Net income.......................................       $   10,655,000    $    9,748,000   $   30,352,000    $   21,124,000
                                                        ==============    ==============   ==============    ==============
Net income allocation:
  Allocable to preferred shareholders............       $    1,272,000    $            -   $    2,134,000    $            -
  Allocable to common shareholders...............            9,383,000         9,748,000       28,218,000        21,124,000
                                                        --------------    --------------   --------------    --------------
                                                        $   10,655,000    $    9,748,000   $   30,352,000    $   21,124,000
                                                        ==============    ==============   ==============    ==============
Net income per common share:
  Basic..........................................       $         0.40    $         0.41   $         1.19    $         1.18
                                                        ==============    ==============   ==============    ==============
  Diluted........................................       $         0.40    $         0.41   $         1.19    $         1.17
                                                        ==============    ==============   ==============    ==============
Weighted average common shares outstanding:
  Basic..........................................           23,641,000        23,636,000       23,639,000        17,920,000
                                                        ==============    ==============   ==============    ==============
  Diluted........................................           23,724,000        23,696,000       23,713,000        17,990,000
                                                        ==============    ==============   ==============    ==============
</TABLE>

                             See accompanying notes.

                                       3
<PAGE>

                             PS BUSINESS PARKS, INC.
            CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
                  For the nine months ended September 30, 1999
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                      Preferred Stock                   Common Stock
                                                 -----------------------------    ---------------------------
                                                    Shares           Amount           Shares         Amount
                                                 ------------    -------------    -----------    ------------
<S>                                              <C>             <C>              <C>            <C>

Balances at December 31, 1998................               -    $           -     23,635,650    $    236,000

   Issuance of preferred stock, net of
     issuance costs..........................           2,200       55,000,000              -               -

   Issuance of common stock..................               -                -          9,811               -

   Net income................................               -                -              -               -

   Distributions paid:
       Preferred stock.......................               -                -              -               -
       Common stock..........................               -                -              -               -

   Adjustment to reflect minority interest
     to underlying ownership interest........               -                -              -               -
                                                 ------------    -------------    -----------    ------------
Balances at September 30, 1999...............           2,200    $  55,000,000     23,645,461    $    236,000
                                                 ============    =============    ===========    ============
</TABLE>


<TABLE>
<CAPTION>

                                                                      Cumulative        Cumulative         Shareholders'
                                                 Paid-in Capital      Net Income       Distributions          Equity
                                                 ---------------     -------------    ---------------     --------------
<S>                                              <C>                 <C>              <C>                 <C>

Balances at December 31, 1998................    $   482,471,000     $  32,554,000    $   (25,356,000)    $  489,905,000

   Issuance of preferred stock, net of
     issuance costs..........................         (1,914,000)                -                  -         53,086,000

   Issuance of common stock..................            161,000                 -                  -            161,000

   Net income................................                  -        30,352,000                  -         30,352,000

   Distributions paid:
       Preferred stock.......................                  -                 -         (2,134,000)        (2,134,000)
       Common stock..........................                  -                 -        (17,729,000)       (17,729,000)

   Adjustment to reflect minority  interest
     to underlying ownership interest........         (1,252,000)                -                  -         (1,252,000)
                                                 ---------------     -------------    ---------------     --------------
Balances at September 30, 1999...............    $   479,466,000     $  62,906,000    $   (45,219,000)    $  552,389,000
                                                 ===============     =============    ===============     ==============
</TABLE>
                             See accompanying notes.

                                       4
<PAGE>


                             PS BUSINESS PARKS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)


<TABLE>
<CAPTION>

                                                                            For the nine months ended September 30,
                                                                          -----------------------------------------
                                                                                1999                       1998
                                                                          -----------------          --------------
<S>                                                                       <C>                        <C>

Cash flows from operating activities:
   Net income........................................................     $      30,352,000          $   21,124,000
   Adjustments to reconcile net income to net cash provided
   by operating activities:..........................................
       Depreciation and amortization expense.........................            21,641,000              11,421,000
       Minority interest in income...................................            10,769,000               8,696,000
       Increase in receivables and other assets......................            (3,274,000)             (2,620,000)
       Increase in accrued and other liabilities.....................             3,257,000               3,221,000
                                                                          -----------------          --------------
         Total adjustments...........................................            32,393,000              20,718,000
                                                                          -----------------          --------------

         Net cash provided by operating activities...................            62,745,000              41,842,000
                                                                          -----------------          --------------

Cash flows from investing activities:
       Acquisition of real estate facilities.........................           (59,555,000)           (252,649,000)
       Acquisition cost of business combination......................                     -                (424,000)
       Capital improvements to real estate facilities................           (10,546,000)             (6,030,000)
       Construction in progress......................................           (11,567,000)                      -
                                                                          -----------------          --------------
         Net cash used in investing activities.......................          ( 81,668,000)           (259,103,000)
                                                                          -----------------          --------------
Cash flows from financing activities:
       Borrowings from an affiliate..................................            41,400,000             179,000,000
       Repayment of borrowings from an affiliate.....................           (41,400,000)           (182,500,000)
       Borrowings from line of credit................................            14,000,000                       -
       Repayment of borrowings from line of credit...................           (26,500,000)                      -
       Principal payments on mortgage notes payable..................           (11,932,000)               (343,000)
       Net proceeds from the issuance of common stock................               161,000             272,112,000
       Net proceeds from the issuance of preferred stock.............            53,086,000                       -
       Net proceeds from the issuance of preferred operating
         partnership units...........................................           129,695,000                       -
       Distributions paid to preferred shareholders..................            (2,134,000)                      -
       Distributions paid to common shareholders.....................           (17,729,000)            (15,897,000)
       Distributions paid to minority interests - preferred..........            (1,236,000)                      -
       Distributions paid to minority interests - common.............            (5,568,000)             (6,248,000)
                                                                          -----------------          --------------

         Net cash provided by financing activities...................           131,843,000             246,124,000
                                                                          -----------------          --------------

Net increase in cash and cash equivalents............................           112,920,000              28,863,000

Cash and cash equivalents at the beginning of the period.............             6,068,000               3,884,000
                                                                          -----------------          --------------
Cash and cash equivalents at the end of the period...................     $     118,988,000          $   32,747,000
                                                                          =================          ==============
</TABLE>

                             See accompanying notes.


                                       5
<PAGE>

                             PS BUSINESS PARKS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                            For the nine months ended September 30,
                                                                            ---------------------------------------
                                                                                  1999                    1998
                                                                            ---------------           -------------
<S>                                                                         <C>                       <C>
Supplemental schedule of non-cash investing and financing activities:

Acquisitions  of real estate  facilities  and  associated  assets and
   liabilities in exchange for minority  interests and mortgage notes
   payable:
       Real estate facilities........................................       $   (20,752,000)          $ (33,584,000)
       Other assets (deposits on real estate acquisitions)...........                     -                 800,000
       Accrued and other liabilities.................................                     -               1,245,000
       Minority interest - common units..............................             1,033,000               1,564,000
       Mortgage notes payable........................................            19,719,000              29,975,000

Business combination:
       Real estate facilities........................................                     -             (48,000,000)
       Other assets..................................................                     -                (452,000)
       Accrued and other liabilities.................................                     -               1,218,000
       Common stock..................................................                     -                  23,000
       Paid-in capital...............................................                     -              46,787,000


Conversion of operating partnership units into shares of
common stock:........................................................
       Minority interest - common units..............................                     -             (33,023,000)
       Common stock..................................................                     -                  18,000
       Paid-in capital...............................................                     -              33,005,000

Adjustment to reflect minority interest to underlying ownership
interest:............................................................
       Minority interest - common units..............................             1,252,000              12,736,000
       Paid-in capital...............................................            (1,252,000)            (12,736,000)

Adjustment to acquisition cost (see Note 2):
       Real estate facilities........................................                     -              (1,315,000)
       Intangible assets.............................................                     -               1,315,000

Capitalization of developed projects:
       Real estate facilities........................................            12,146,000                       -
       Construction in progress......................................           (12,146,000)                      -


</TABLE>

                             See accompanying notes.
                                       6
<PAGE>


                             PS BUSINESS PARKS, INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                               September 30, 1999
                                   (Unaudited)



1.   Organization and description of business

     Organization

     PS Business Parks, Inc. ("PSB" or the "Company"), a California corporation,
     is the successor to American Office Park  Properties,  Inc.  ("AOPP") which
     merged with and into Public Storage Properties XI, Inc. ("PSP 11") on March
     17,  1998  (the  "Merger").  The name of the  Company  was  changed  to "PS
     Business  Parks,  Inc." in  connection  with the  Merger.  See Note 3 for a
     description of the Merger and its terms.

     Based upon the terms of the Merger, 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.

     Description of business

     PSB  is a  fully-integrated,  self-managed  real  estate  investment  trust
     ("REIT") that acquires,  owns, operates and develops commercial  properties
     containing  commercial and industrial rental space. PSB is the sole general
     partner of PS Business Parks,  L.P. (the "Operating  Partnership")  through
     which the Company conducts most of its activities.  From 1986 through 1996,
     PSB's sole  business  activity  consisted of the  management  of commercial
     properties  owned primarily by Public Storage,  Inc. ("PSI") and affiliated
     entities.

     Commencing in 1997, PSB began to own and operate commercial  properties for
     its own behalf.  At September 30, 1999,  PSB and the Operating  Partnership
     collectively  owned and operated 123 commercial  properties  (approximately
     12.0 million net rentable  square feet) located in 11 states.  In addition,
     the Operating Partnership managed 37 commercial  properties  (approximately
     1.0  million  net  rentable  square  feet) on behalf of PSI and  affiliated
     entities.

2.   Summary of significant accounting policies

     Basis of presentation

     The accompanying unaudited condensed consolidated financial statements have
     been prepared in accordance with generally accepted  accounting  principles
     for interim  financial  information and with  instructions to Form 10-Q and
     Article 10 of Regulation S-X.  Accordingly,  they do not include all of the
     information  and  footnotes  required  by  generally  accepted   accounting
     principles  for  complete  financial  statements.  The  preparation  of the
     condensed  consolidated  financial  statements in conformity with generally
     accepted  accounting  principles  requires management to make estimates and
     assumptions that affect the amounts reported in the condensed  consolidated
     financial  statements and accompanying  notes.  Actual results could differ
     from estimates.  In the opinion of management,  all adjustments (consisting
     of normal recurring  accruals)  necessary for a fair presentation have been
     included.  Operating  results for the three and nine months ended September
     30, 1999 are not necessarily indicative of the results that may be expected
     for the year ended December 31, 1999. For further information, refer to the
     consolidated  financial  statements and footnotes thereto included in PSB's
     annual report on Form 10-K for the year ended December 31, 1998.

     The condensed consolidated financial statements include the accounts of PSB
     and  the  Operating   Partnership.   At  September  30,  1999,   PSB  owned
     approximately 72.5% of the common units of the Operating Partnership.  PSB,
     as the  sole  general  partner  of the  Operating  Partnership,  has  full,
     exclusive  and  complete  responsibility  and  discretion  in managing  and
     controlling the Operating  Partnership.  Historical financial data of PSP11
     have not been included in the historical financial statements of PSB.

                                       7
<PAGE>

     Cash and cash equivalents

     PSB considers all highly liquid  investments  with an original  maturity of
     three  months or less at the date of purchase to be cash  equivalents.  The
     carrying amount of cash and cash equivalents approximates fair value.

     Real estate facilities

     Costs  related  to  the   improvements   of  properties  are   capitalized.
     Expenditures  for  repairs  and  maintenance  are  charged to expense  when
     incurred.  Buildings  and equipment are  depreciated  on the  straight-line
     method over the estimated useful lives, which are generally 30 and 5 years,
     respectively.

     Interest cost  incurred  during the period of  construction  of real estate
     facilities is capitalized.  Construction in progress  includes $852,000 and
     $268,000 of  capitalized  interest costs at September 30, 1999 and December
     31, 1998,  respectively.  The Company capitalized  $584,000 during the nine
     months ended  September  30, 1999. No interest was  capitalized  during the
     nine months ended September 30, 1998.

     Intangible assets

     Intangible assets consist of property  management  contracts for properties
     managed,  but not owned, by PSB. The intangible  assets are being amortized
     over seven years. As properties managed have been subsequently  acquired by
     PSB, the unamortized  basis of intangible assets related to such properties
     is included in the cost of  acquisition of such  properties.  In connection
     with the Merger,  PSB  acquired 13  properties  and included in the cost of
     such properties is $1,315,000 (which was net of accumulated amortization of
     $194,000) of costs previously  classified as intangible assets.  Intangible
     assets are net of  accumulated  amortization  of $799,000  and  $573,000 at
     September 30, 1999 and December 31, 1998, respectively.

     Evaluation of asset impairment

     PSB evaluates its assets used in operations,  by identifying  indicators of
     impairment  and by comparing the sum of the estimated  undiscounted  future
     cash flows for each asset to the asset's carrying  amount.  When indicators
     of impairment are present and the sum of the undiscounted future cash flows
     is less  than the  carrying  value of such  asset,  an  impairment  loss is
     recorded equal to the difference between the asset's current carrying value
     and its value based on  discounting  its  estimated  future cash flows.  At
     September 30, 1999, no such indicators of impairment have been identified.

     Borrowings from an affiliate

     The Company  borrowed  $41.4 million from PSI during the nine months ending
     September  30, 1999.  The notes bore  interest at 5.5% (per annum) and were
     repaid as of April 30, 1999.

     Revenue and expense recognition

     All leases are classified as operating leases.  Rental income is recognized
     on a straight-line basis over the terms of the leases.  Reimbursements from
     tenants for real estate taxes and other recoverable  operating expenses are
     recognized as revenue in the period the applicable costs are incurred.

     Costs incurred in connection with leasing  (primarily  tenant  improvements
     and leasing  commissions)  are  capitalized  and  amortized  over the lease
     period.

     Property management fees are recognized in the period earned.

                                       8
<PAGE>

     General and administrative expense

     General and administrative expense includes executive compensation,  office
     expense,  professional  fees,  state  income  taxes,  cost  of  acquisition
     personnel and other such administrative items. Such amounts include amounts
     incurred by PSI on behalf of PSB, which were subsequently charged to PSB in
     accordance with the allocation  methodology pursuant to the cost allocation
     and administrative service agreement between PSB and PSI.

     Acquisition and development costs

     Internal acquisition and development costs are expensed as incurred.

     Income taxes

     During  1997,  PSB  qualified  and intends to continue to qualify as a real
     estate investment trust ("REIT"), as defined in Section 856 of the Internal
     Revenue  Code. As a REIT,  PSB is not subject to federal  income tax to the
     extent  that it  distributes  at least  95% of its  taxable  income  to its
     shareholders.  In addition, REITs are subject to a number of organizational
     and  operating  requirements.  If the Company fails to qualify as a REIT in
     any  taxable  year,  the  Company  will be subject  to  federal  income tax
     (including  any  applicable  alternative  minimum tax) based on its taxable
     income using corporate income tax rates.  Even if the Company qualifies for
     taxation as a REIT,  the Company may be subject to certain  state and local
     taxes on its income and property and to federal  income and excise taxes on
     its  undistributed   taxable  income.  The  Company  believes  it  met  all
     organizational  and  operating  requirements  to  maintain  its REIT status
     during 1998 and intends to  continue  to meet such  requirements  for 1999.
     Accordingly,   no  provision   for  income  taxes  has  been  made  in  the
     accompanying financial statements.

     Net income per common share

     Per share  amounts are computed  using the weighted  average  common shares
     outstanding.  "Diluted" weighted average common shares outstanding  include
     the  dilutive  effect of stock  options  under the treasury  stock  method.
     "Basic"  weighted average common shares  outstanding  excludes such effect.
     Earnings per common share has been calculated as follows:


<TABLE>
<CAPTION>

                                                                 For the Three Months Ended      For the Nine Months Ended
                                                                        September 30,                  September 30,
                                                               -----------------------------   ------------------------------
                                                                    1999            1998            1999           1998
                                                               ------------    -------------   --------------  --------------
<S>                                                            <C>              <C>            <C>             <C>

Net income allocable to common shareholders                    $  9,383,000    $   9,748,000   $   28,218,000  $   21,124,000
                                                               ============    =============   ==============  ==============

Weighted average common shares outstanding:
  Basic weighted average common shares outstanding..........     23,641,000       23,636,000       23,639,000      17,920,000

  Net effect of dilutive  stock  options - based
    on treasury stock method using average market price.....         83,000           60,000           74,000          70,000
                                                               ------------    -------------   --------------  --------------
  Diluted weighted average common shares outstanding........     23,724,000       23,696,000       23,713,000      17,990,000
                                                               ============    =============   ==============  ==============


Basic earnings per common share.............................   $       0.40    $        0.41   $         1.19  $         1.18
                                                               ============    =============   ==============  ==============
Diluted earnings per common share...........................   $       0.40    $        0.41   $         1.19  $         1.17
                                                               ============    =============   ==============  ==============

</TABLE>

                                       9
<PAGE>

     Comprehensive Income

     Effective   January  1,  1998,   PSB  adopted  SFAS  No.  130,   "Reporting
     Comprehensive Income." SFAS No. 130 requires a separate statement to report
     the  components  of  comprehensive  income for each  period  reported.  The
     adoption  of SFAS  No.  130  did not  have an  impact  on  PSB's  reporting
     presentation.

     Segment Reporting

     Effective  January 1, 1998,  PSB adopted SFAS No. 131,  "Disclosures  about
     Segments  of  an  Enterprise  and  Related   Information."   SFAS  No.  131
     established  standards  for  the way  public  business  enterprises  report
     information  about operating  segments in annual  financial  statements and
     requires that those enterprises report selected information about operating
     segments in interim financial reports.  SFAS 131 also establishes standards
     for related disclosures about products and services,  geographic areas, and
     major  customers.  As management views the Company as operating in a single
     segment as described in Note 1, the adoption of SFAS No. 131 did not affect
     PSB's disclosure of segment information.

     Reclassifications

     Certain  reclassifications  have been made to the financial  statements for
     1998 in order to conform to the 1999 presentation.

3.   Business combination

     On March 17, 1998,  AOPP merged into PSP11,  a publicly  traded real estate
     investment  trust and an affiliate of PSI. Upon  consummation of the Merger
     of AOPP into PSP11,  the  surviving  corporation  was renamed "PS  Business
     Parks, Inc." (PSB as defined in Note 1). In connection with the Merger:

      *   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.

      *   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.

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

      *   Concurrent with the Merger, PSP11 exchanged 11 mini-warehouses and two
          properties  that combine  mini-warehouse  and commercial  space for 11
          commercial  properties  owned by PSI.  The fair value of 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.

                                       10
<PAGE>

     Allocations of the total  acquisition  cost to the net assets acquired were
     made based upon the fair value of PSP11's assets and  liabilities as of the
     date of the Merger.  The acquisition cost and the fair market values of the
     assets  acquired and  liabilities  assumed in the Merger are  summarized as
     follows:

          Acquisition cost:

          Issuance of common stock.........       $46,810,000
          Cash.............................           424,000
                                                  ------------
          Total acquisition cost...........       $47,234,000
                                                  ============

          Allocation of acquisition cost:

          Real estate facilities...........       $48,000,000
          Other assets.....................           452,000
          Accrued and other liabilities....       (1,218,000)
                                                  ------------
          Total allocation.................       $47,234,000
                                                  ============

     The historical operating results of PSP11 prior to the Merger have not been
     included in PSB's historical operating results. Pro forma data for the nine
     months ended  September 30, 1998 as though the Merger and related  exchange
     of  properties  have been  effective at the  beginning of fiscal 1998 is as
     follows:

                                                  Nine months ended
                                                 September 30, 1998
                                                 ------------------

     Revenues..............................         $64,853,000
     Net income............................         $21,908,000
     Net income per share - basic..........         $      1.18
     Net income per share - diluted........         $      1.18

     The pro forma data does not purport to be indicative  either of the results
     of  operations  that would have  occurred  had the Merger  occurred  at the
     beginning of fiscal 1998 or of the future results of PSB.

                                       11
<PAGE>

4.   Real estate facilities

     The activity in real estate  facilities for the nine months ended September
     30, 1999 is as follows:

<TABLE>
<CAPTION>
                                                                                 Accumulated
                                                Land            Buildings       Depreciation            Total
                                           ---------------   ---------------    ---------------   ---------------
     <S>                                   <C>               <C>                <C>               <C>

     Balances at December 31, 1998......   $   176,241,000   $   536,697,000    $   (22,517,000)  $   690,421,000
     Property acquisitions..............        13,770,000        66,537,000                  -        80,307,000
     Developed projects.................         2,341,000         9,805,000                  -        12,146,000
     Capital improvements...............                 -        10,546,000                  -        10,546,000
     Depreciation expense...............                 -                 -        (21,415,000)      (21,415,000)
                                           ---------------   ---------------    ---------------   ---------------
     Balances at September 30, 1999.....   $   192,352,000   $   623,585,000    $   (43,932,000)  $   772,005,000
                                           ===============   ===============    ===============   ===============

</TABLE>

5.   Leasing activity

     The Company  leases space in its real estate  facilities  to tenants  under
     non-cancelable  leases  generally  ranging  from one to ten  years.  Future
     minimum rental revenues  excluding recovery of expenses as of September 30,
     1999 under these leases are as follows:

         1999 (October - December)...........         $   25,623,000
         2000................................             88,247,000
         2001................................             63,685,000
         2002................................             42,843,000
         2003................................             28,028,000
         Thereafter..........................             51,406,000
                                                      --------------
                                                      $  299,832,000
                                                      ==============

     In addition to minimum  rental  payments,  tenants pay  reimbursements  for
     their pro rata  share of  specified  operating  expenses,  which  amount to
     $12,369,000 and $7,051,000 for the nine months ended September 30, 1999 and
     1998, respectively. These amounts are included as rental income and cost of
     operations in the accompanying condensed consolidated statements of income.

6.   Revolving line of credit

     The Company  extended its unsecured line of credit (the "Credit  Facility")
     with Wells Fargo Bank.  The Credit  Facility has a borrowing  limit of $100
     million and a revised  expiration  date of August 6, 2002.  The  expiration
     date  may be  extended  by one  year  on  each  anniversary  of the  Credit
     Facility.  Interest on outstanding  borrowings is payable  monthly.  At the
     option of the  Company,  the rate of  interest  charged is equal to (i) the
     prime rate or (ii) a rate  ranging from the London  Interbank  Offered Rate
     ("LIBOR") plus 0.75% to LIBOR plus 1.35% depending on the Company's  credit
     ratings and coverage ratios,  as defined  (currently LIBOR plus 1.00%).  In
     addition, the Company is required to pay an annual commitment fee of 0.25%.

     Under  covenants  of the Credit  Facility,  the  Company is required to (i)
     maintain a balance sheet  leverage  ratio (as defined) of less than 0.50 to
     1.00, (ii) maintain  interest and fixed charge coverage ratios (as defined)
     of not less than 2.25 to 1.0 and 1.75 to 1.0, respectively,  (iii) maintain
     a  minimum  total   shareholders'   equity  (as  defined)  and  (iv)  limit
     distributions to 95% of funds from operations.  In addition, the Company is
     limited  in its  ability to incur  additional  borrowings  (the  Company is
     required to maintain unencumbered assets with an aggregate book value equal
     to or greater than two times the Company's unsecured recourse debt) or sell
     assets.  The Company was in  compliance  with the  covenants  of the Credit
     Facility at September 30, 1999.

                                       12
<PAGE>

7.   Mortgage notes payable

<TABLE>
<CAPTION>

         Mortgage notes at September 30, 1999 consist of the following:

             <S>                                                                      <C>

             7.125% mortgage note, secured by one commercial property, principal
                  and interest payable monthly, due May 2006......................       8,794,000
             8.4% mortgage note, secured by six commercial properties, principal
                  and interest payable monthly, due November 1999.................       8,554,000
             8.19% mortgage note, secured by one commercial property, principal
                  and interest payable monthly, due March 2007....................       6,710,000
             8.125% mortgage note, secured by one commercial property, principal
                  and interest payable monthly, due February 2009.................       6,396,000
             8.125% mortgage note, secured by one commercial property, principal
                  and interest payable monthly, due July 2005.....................       5,352,000
             7.28% mortgage note, secured by two commercial properties, principal
                  and interest payable monthly, due February 2003.................       4,332,000
             8% mortgage note, secured by one commercial  property, principal and
                  interest payable monthly, due April 2003........................       2,128,000
             8.5% mortgage note, secured by one commercial property, principal
                  and interest payable monthly, due July 2007.....................       1,910,000
             8% mortgage note, secured by one commercial property, principal and
                  interest payable monthly, due April 2003........................       1,652,000
                                                                                       -----------
                                                                                       $45,828,000
                                                                                       ===========
</TABLE>

     At September 30, 1999, approximate principal maturities of mortgage notes
payable are as follows:

            1999 (October - December)...........           $    8,762,000
            2000................................                  872,000
            2001................................                  942,000
            2002................................                1,018,000
            2003................................                8,004,000
            Thereafter..........................               26,230,000
                                                           --------------
                                                           $   45,828,000
                                                           ==============
                                       13
<PAGE>

8.   Minority interest - common units

     The Company presents the accounts of PSB and the Operating Partnership on a
     consolidated basis. Ownership interest in the Operating Partnership,  other
     than PSB's interest,  are classified as minority  interest in the condensed
     consolidated financial statements.  Minority interest in income consists of
     the  minority  interests'  share of the  condensed  consolidated  operating
     results.

     Beginning  one year from the date of  admission  as a limited  partner  and
     subject to certain limitations  described below, each limited partner other
     than  PSB has the  right  to  require  the  redemption  of its  partnership
     interest.

     A limited  partner that  exercises its  redemption  right will receive cash
     from the Operating  Partnership  in an amount equal to the market value (as
     defined  in  the  Operating  Partnership   Agreement)  of  the  partnership
     interests  redeemed.  In lieu of the  Operating  Partnership  redeeming the
     partner  for  cash,  PSB,  as  general  partner,  has the right to elect to
     acquire the partnership interest directly from a limited partner exercising
     its redemption right, in exchange for cash in the amount specified above or
     by  issuance  of one share of PSB  common  stock  for each unit of  limited
     partnership interest redeemed.

     A limited  partner  cannot  exercise  its  redemption  right if delivery of
     shares  of PSB  common  stock  would be  prohibited  under  the  applicable
     articles of incorporation,  if the general partner believes that there is a
     risk  that  delivery  of shares of common  stock  would  cause the  general
     partner to no longer  qualify as a REIT,  would  cause a  violation  of the
     applicable securities laws, or would result in the Operating Partnership no
     longer being treated as a partnership for federal income tax purposes.

     At September 30, 1999,  there were 7,443,356 common units owned by minority
     interests  (7,305,355 were owned by PSI and affiliated entities and 138,001
     were owned by  unaffiliated  third parties).  On a fully  converted  basis,
     assuming all 7,443,356  minority  interest common units were converted into
     shares of common stock of PSB at September 30, 1999, the minority interests
     would own approximately 23.9% of the common shares outstanding.  At the end
     of each reporting  period,  PSB determines the amount of equity (book value
     of net assets) which is allocable to the minority  interest  based upon the
     ownership interest and an adjustment is made to the minority interest, with
     a  corresponding  adjustment  to paid-in  capital,  to reflect the minority
     interests' equity in the Company.

9.   Minority interest - preferred units

     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.

     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 and part of the proceeds will be used to prepay a
     mortgage note payable of approximately $8.5 million.

     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.

     The Operating Partnership has the right to redeem the preferred units on or
     after the fifth  anniversary  of the issuance date at the original  capital
     contribution plus the cumulative  priority return to the redemption date to
     the extent not previously distributed. The preferred units are exchangeable
     for Cumulative  Redeemable  Preferred Stock of the respective  series of PS
     Business  Parks,  Inc.  on or after  the tenth  anniversary  of the date of
     issuance  at the option of the  Operating  Partnership  or  majority of the
     holders of the  preferred  units.  The  Preferred  Stock will have the same
     distribution  rate and par  value as the  respective  units  and will  have
     equivalent terms to those described in Note 11.

                                       14
<PAGE>

10.  Property management contracts

     The Operating Partnership manages industrial,  office and retail facilities
     for PSI and entities affiliated with PSI. These facilities,  all located in
     the United  States,  operate  under the "Public  Storage"  or "PS  Business
     Parks" name.

     The property management  contracts provide for compensation of five percent
     of the gross revenue of the facilities  managed.  Under the  supervision of
     the property owners, the Operating Partnership coordinates rental policies,
     rent  collections,  marketing  activities,  the purchase of  equipment  and
     supplies,  maintenance  activities,  and the  selection  and  engagement of
     vendors, suppliers and independent contractors.  In addition, the Operating
     Partnership  assists  and  advises  the  property  owners  in  establishing
     policies for the hire,  discharge  and  supervision  of  employees  for the
     operation  of  these  facilities,  including  property  managers,  leasing,
     billing and maintenance personnel.

     The property management contract with PSI is for a seven year term with the
     term being  extended one year each  anniversary.  The  property  management
     contracts with  affiliates of PSI are cancelable by either party upon sixty
     days notice.

11.  Shareholders' equity

     In addition  to common and  preferred  stock,  PSB is  authorized  to issue
     100,000,000  shares of Equity Stock. The Articles of Incorporation  provide
     that the Equity Stock may be issued from time to time in one or more series
     and gives the Board of  Directors  broad  authority to fix the dividend and
     distribution rights,  conversion and voting rights,  redemption  provisions
     and liquidation rights of each series of Equity Stock.

     On April 30, 1999, 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.

     Holders of the  Company's  preferred  stock will not be entitled to vote on
     most matters, except under certain conditions. In the event of a cumulative
     arrearage  equal to six quarterly  dividends,  the holders of the preferred
     stock will have the right to elect two  additional  members to serve on the
     Company's  Board of Directors  until all events of default have been cured.
     At September 30, 1999, there were no dividends in arrears.

     Except under certain conditions relating to the Company's  qualification as
     a REIT, the preferred  stock is not redeemable  prior to April 30, 2004. On
     or after April 30, 2004,  the preferred  stock will be  redeemable,  at the
     option of the Company,  in whole or in part, at $25 per  depositary  share,
     plus any accrued and unpaid dividends.

     The Company paid  distributions  to its common and  preferred  shareholders
     totaling $17,729,000 ($0.75 per common share) and $2,134,000 ($0.969965 per
     depositary  share),  respectively,  for the nine months ended September 30,
     1999.

                                       15
<PAGE>

12.  Recent accounting pronouncements

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
     "Accounting for Derivative  Instruments and Hedging  Activities,"  which is
     required to be adopted in years beginning  after June 15, 2000.  Management
     anticipates  that the  adoption  of SFAS No.  133 will  have no  effect  on
     earnings  or  the  financial  position  of PSB  since  no  derivatives  are
     currently being used.

13.  Commitments and contingencies

     PSB is subject to the risks  inherent in the  ownership  and  operation  of
     commercial  real estate.  These include,  among others,  the risks normally
     associated with changes in the general economic climate, trends in the real
     estate industry,  creditworthiness of tenants, competition,  changes in tax
     laws,  interest rate levels,  the  availability  of financing and potential
     liability under environmental and other laws.

     Substantially  all of  the  properties  have  been  subjected  to  Phase  I
     environmental  reviews.  Such reviews have not revealed,  nor is management
     aware of, any  probable or  reasonably  possible  environmental  costs that
     management  believes  would  be  material  to  the  condensed  consolidated
     financial statements except as discussed below.

     The Company acquired a property in Beaverton,  Oregon ("Creekside Corporate
     Park") in May 1998.  A property  adjacent to  Creekside  Corporate  Park is
     currently     the     subject     of     an     environmental      remedial
     investigation/feasibility  study that is being conducted by the current and
     past  owners of the  property,  pursuant  to an order  issued by the Oregon
     Department of Environmental  Quality ("ODEQ").  As part of that study, ODEQ
     ordered the property owners to sample soil and groundwater on the Company's
     property to determine the nature and extent of contamination resulting from
     past  industrial  operations  at the  property  subject to the  study.  The
     Company,  which is not a party of the Order on Consent,  executed  separate
     Access  Agreements with the property owners to allow access to its property
     to conduct the required  sampling and testing.  The sampling and testing is
     ongoing,   and  preliminary   results  from  one  area  indicate  that  the
     contamination from the property subject to the study may have migrated onto
     a portion of Creekside Corporate Park owned by the Company.

     There  is no  evidence  that  any  past  or  current  use of the  Creekside
     Corporate Park property contributed in any way to the contamination that is
     the subject of the current investigation.  Nevertheless, upon completion of
     the study, it is likely that removal or remedial  measures will be required
     to address any  contamination  detected  during the current  investigation,
     including  any  contamination  on or under  the  Creekside  Corporate  Park
     property.  Because  of the  preliminary  nature of the  investigation,  the
     Company  cannot  predict  the  outcome  of the  investigation,  nor  can it
     estimate the costs of any  remediation  or removal  activities  that may be
     required.

     The Company believes that it bears no  responsibility  or liability for the
     contamination.  In the event the Company is ultimately  deemed  responsible
     for any costs relating to this matter,  the Company believes that the party
     from whom the property was purchased will be  responsible  for any expenses
     or   liabilities   that  the   Company  may  incur  as  a  result  of  this
     contamination.

     PSB currently is neither  subject to any other material  litigation nor, to
     management's  knowledge,  is any material litigation  currently  threatened
     against PSB other than routine  litigation and  administrative  proceedings
     arising in the ordinary  course of  business.  Based on  consultation  with
     counsel,  management  believes  that  these  items will not have a material
     adverse impact on the Company's condensed  consolidated  financial position
     or results of operations.

                                       16
<PAGE>


Item 2:  Management's Discussion and Analysis of Financial Condition and
         Results of Operations
         ---------------------------------------------------------------

          General:   Private  Securities   Litigation  Reform  Act  Safe  Harbor
Statement.  In addition to historical  information,  management's discussion and
analysis  includes  certain  forward-looking  statements  regarding  events  and
financial  trends which may affect the Company's  future  operating  results and
financial position. Such forward-looking  statements are often identified by the
words "estimate,"  "project,"  "intend," "plan," "expect," "believe," or similar
expressions.  Such statements are subject to risks and uncertainties  that could
cause the Company's actual results and financial  position to differ  materially
from that indicated by the forward-looking  statement. Such factors include, but
are not limited to a change in economic conditions in the various markets served
by the Company's operations which would adversely affect the level of demand for
rental of commercial  space and the cost  structure of the Company.  Readers are
cautioned not to place undue reliance on these forward-looking statements, which
speak only as of the date  hereof.  The  Company  undertakes  no  obligation  to
publicly release the result of any revisions to these forward-looking statements
to reflect  events or  circumstances  after the date  hereof or to  reflect  the
occurrence of unanticipated events.

          Overview:   Comparisons  between  the  three  and  nine  months  ended
September  30, 1999 and 1998 will  reflect  significant  levels of  acquisitions
during 1998 and the first nine months of 1999.

          During  1998,  the  Company  added  4.9  million  square  feet  to its
portfolio.  The cost of these acquisitions was approximately  $378 million.  The
acquisitions  added  square  footage  to each  of the  Company's  existing  core
markets.  The Company  acquired  1,687,000  square feet in Texas at an aggregate
cost of approximately $102 million; 1,001,000 square feet in Portland, Oregon at
an aggregate cost of  approximately  $115 million;  1,442,000 square feet in the
Northern  Virginia/Maryland  market at an aggregate cost of  approximately  $108
million;  422,000  square feet in Southern  California  at an aggregate  cost of
approximately  $25 million and 307,000 square feet in Northern  California at an
aggregate cost of approximately $25 million.  In addition,  the Company acquired
62,000  square  feet in the  Merger at an  aggregate  cost of  approximately  $3
million in a market the Company does not consider a core market.

          During the nine months ended  September  30, 1999,  the Company  added
922,000  square  feet to its  portfolio.  The  cost of  these  acquisitions  was
approximately $80 million.  These acquisitions  increased the Company's presence
in existing markets,  which the Company believes have characteristics  necessary
for long-term  growth.  The Company  acquired 306,000 square feet in Texas at an
aggregate cost of approximately $23 million, 405,000 square feet in the Northern
Virginia/Maryland  market at an aggregate cost of approximately  $40 million and
211,000 square feet in Northern California for approximately $17 million.

          Results of Operations: Net income for the three months ended September
30, 1999 was $10,655,000 compared to $9,748,000 for the same period in 1998. Net
income  allocable  to common  shareholders  (net  income  less  preferred  stock
dividends) for the three months ended September 30, 1999 was $9,383,000 compared
to  $9,748,000  for the same  period in 1998.  Net income per common  share on a
diluted basis was $0.40 (based on weighted average diluted shares outstanding of
23,724,000) for the three months ended September 30, 1999 compared to net income
per common share on a diluted basis of $0.41 (based on weighted  average diluted
shares  outstanding of  23,696,000)  for the same period in 1998. Net income for
the nine months ended September 30, 1999 was $30,352,000 compared to $21,124,000
for the same period in 1998. Net income  allocable to common  shareholders  (net
income less preferred  stock  dividends) for the nine months ended September 30,
1999 was  $28,218,000  compared to $21,124,000  for the same period in 1998. Net
income per common share on a diluted basis was $1.19 (based on weighted  average
diluted shares  outstanding of 23,713,000)  for the nine months ended  September
30,  1999  compared to net income per common  share on a diluted  basis of $1.17
(based on weighted  average  diluted shares  outstanding of 17,990,000)  for the
same period in 1998.  The  increases in net income  reflects  PSB's  significant
growth in its asset base through the  acquisition  of commercial  properties and
increase in net operating income from the consistent group of properties.

                                       17
<PAGE>

          The Company's  property  operations  account for almost all of the net
operating  income  earned by the  Company.  The  following  table  presents  the
pre-depreciation  operating  results  of the  properties  for the three and nine
months ended September 30, 1999 and 1998:

<TABLE>
<CAPTION>

                                                              Three Months Ended September 30,
                                                              ----------------------------------
                                                                    1999               1998               Change
                                                              --------------      --------------       ----------
<S>                                                           <C>                 <C>                  <C>

Rental income:
     Facilities owned throughout each period (50
       facilities, 6.4 million net rentable square feet)..      $16,353,000         $15,208,000             7.5%
     Facilities acquired subsequent to January 1998 (73
       facilities, 5.5 million net rentable square feet)..       16,215,000          10,427,000            55.5%
                                                              --------------      --------------       ----------
Total rental income.......................................      $32,568,000         $25,635,000            27.0%
                                                              ==============      ==============       ==========

Cost of operations (excluding depreciation):
     Facilities owned throughout each period..............       $4,671,000          $4,773,000            (2.1%)
     Facilities acquired subsequent to January 1998.......        4,249,000           2,606,000            63.0%
                                                              --------------      --------------       ----------
Total cost of operations..................................       $8,920,000           7,379,000            20.9%
                                                              ==============      ==============       ==========

Net operating income (rental income less cost of operations):
     Facilities owned throughout each period..............      $11,682,000         $10,435,000            12.0%
     Facilities acquired subsequent to January 1998.......       11,966,000           7,821,000            53.0%
                                                              --------------      --------------       ----------
Total net operating income................................      $23,648,000         $18,256,000            29.5%
                                                              ==============      ==============       ==========
</TABLE>

<TABLE>
<CAPTION>

                                                               Nine Months Ended September 30,
                                                              ---------------------------------
                                                                   1999               1998              Change
                                                              -------------      --------------       ----------
<S>                                                           <C>                 <C>                  <C>

Rental income:
     Facilities owned throughout each period (50
       facilities, 6.4 million net rentable square feet)..    $  47,231,000      $   43,152,000             9.5%
     Facilities  acquired  subsequent  to January 1998 (73
       facilities, 5.5 million net rentable square feet)..       45,313,000          18,307,000           147.5%
                                                              -------------      --------------       ----------
Total rental income.......................................    $  92,544,000      $   61,459,000            50.6%
                                                              =============      ==============       ==========

Cost of operations (excluding depreciation):
     Facilities owned throughout each period..............    $  13,998,000      $   13,830,000             1.2%
     Facilities acquired subsequent to January 1998.......       11,953,000           4,531,000           163.8%
                                                              -------------      --------------       ----------
Total cost of operations..................................    $  25,951,000          18,361,000            41.3%
                                                              =============      ==============       ==========

Net operating income (rental income less cost of operations):
     Facilities owned throughout each period..............    $  33,233,000      $   29,322,000            13.3%
     Facilities acquired subsequent to January 1998.......       33,360,000          13,776,000           142.2%
                                                              -------------      --------------       ----------
Total net operating income................................    $  66,593,000      $   43,098,000            54.5%
                                                              =============      ==============       ==========
</TABLE>

                                       18
<PAGE>

     Rental  income and rental  income less cost of  operations or net operating
income ("NOI") prior to  depreciation  are summarized for the three months ended
September 30, 1999 by major geographic region below:

<TABLE>
<CAPTION>

                                   Square       Percent         Rental         Percent                        Percent
          Region                   Footage      of Total        Income         of Total          NOI          of Total
- ---------------------------      -----------   ----------      ------------    --------     ------------      --------
<S>                              <C>           <C>             <C>             <C>          <C>               <C>

Southern California.......        3,091,000        25.8%        $8,761,000        26.9%      $6,494,000          27.5%
Northern California.......        1,317,000        11.0%         3,398,000        10.4%       2,582,000          10.9%
Virginia..................        1,612,000        13.4%         5,254,000        16.1%       3,771,000          15.9%
Maryland..................        1,104,000         9.2%         3,469,000        10.7%       2,568,000          10.9%
Texas.....................        2,857,000        23.8%         6,497,000        19.9%       4,367,000          18.5%
Oregon....................        1,172,000         9.8%         3,700,000        11.4%       2,899,000          12.3%
Other.....................          833,000         7.0%         1,489,000         4.6%         967,000           4.0%
                                 -----------   ----------      ------------    --------     ------------      --------
                                 11,986,000       100.0%       $32,568,000       100.0%     $23,648,000         100.0%
                                 ===========   ==========      ============    ========     ============      ========
</TABLE>

         Rental income and rental income less cost of operations or net
operating income ("NOI") prior to depreciation are summarized for the nine
months ended September 30, 1999 by major geographic region below:

<TABLE>
<CAPTION>
                                   Square       Percent         Rental         Percent                        Percent
          Region                   Footage      of Total        Income         of Total          NOI          of Total
- ---------------------------      -----------   ---------       -----------     --------     -----------      ---------
<S>                              <C>           <C>             <C>             <C>          <C>               <C>

Southern California.......        3,091,000        25.8%       $25,163,000        27.2%     $18,638,000          28.0%
Northern California.......        1,317,000        11.0%         8,830,000         9.5%       6,643,000          10.0%
Virginia..................        1,612,000        13.4%        13,497,000        14.6%       9,609,000          14.4%
Maryland..................        1,104,000         9.2%        10,215,000        11.0%       7,328,000          11.0%
Texas.....................        2,857,000        23.8%        19,444,000        21.0%      12,919,000          19.4%
Oregon....................        1,172,000         9.8%        11,036,000        11.9%       8,690,000          13.0%
Other.....................          833,000         7.0%         4,359,000         4.8%       2,766,000           4.2%
                                 ----------    ---------       -----------     --------     -----------      ---------
                                 11,986,000       100.0%       $92,544,000       100.0%     $66,593,000         100.0%
                                 ==========    =========       ===========     ========     ===========      =========
</TABLE>

          Supplemental  Property  Data and  Trends:  In order  to  evaluate  the
performance  of  the  Company's  overall  portfolio,   management  analyzes  the
operating  performance of a consistent  group of 62 properties  (7.2 million net
rentable square feet). These 62 properties in which the Company currently has an
ownership  interest (herein referred to as the "Same Park" facilities) have been
managed by the Company since January 1998.  The following  table  summarizes the
pre-depreciation  historical  operating  results of the "Same  Park"  facilities
excluding the effects of accounting for rental income on a straight-line  basis.
The "Same Park" facilities now represent approximately 60% of the square footage
of the Company's portfolio at September 30, 1999.

                                       19
<PAGE>

                     "Same Park" Facilities (62 Properties)
                     --------------------------------------

<TABLE>
<CAPTION>
                                                                                Three months ended September 30,
                                                                       ------------------------------------------------
                                                                           1999               1998              Change
                                                                       -------------      -------------         -------
     <S>                                                               <C>                <C>                   <C>

     Rental income (1)............................................     $  18,697,000      $  17,216,000            8.6%
     Cost of operations...........................................         5,896,000          5,869,000            0.5%
                                                                       -------------      -------------         -------
          Net operating income....................................     $  12,801,000      $  11,347,000           12.8%
                                                                       =============      =============         =======
     Gross margin (2).............................................             68.5%              65.9%            2.6%

     Weighted average for period:
     ---------------------------

          Occupancy...............................................            96.7%              95.3%            1.4%

          Annualized realized rent per sq. ft.(3).................     $      10.74             $10.03             7.1%

</TABLE>

<TABLE>
<CAPTION>

                                                                                 Nine months ended September 30,
                                                                       ------------------------------------------------
                                                                           1999             1998 (4)            Change
                                                                       -------------      -------------         -------
     <S>                                                               <C>                <C>                   <C>

     Rental income (1)............................................     $  54,025,000      $  49,824,000            8.4%
     Cost of operations...........................................        16,944,000         16,583,000            2.2%
                                                                       -------------      -------------         -------
          Net operating income....................................     $  37,081,000      $  33,241,000           11.6%
                                                                       =============      =============         =======
     Gross margin (2).............................................             68.6%              66.7%            1.9%

     Weighted average for period:
     ---------------------------

          Occupancy...............................................             96.7%              94.4%            2.3%

          Annualized realized rent per sq. ft.(3).................      $     10.34       $       9.77             5.8%
</TABLE>

- ------------------
(1)  Rental income does not include the effect of straight-line accounting.
(2)  Gross margin is computed by dividing property net operating income by
     rental income.
(3)  Realized rent per square foot represents the actual revenues earned per
     occupied square foot.
(4)  Operations for the nine months ended September 30, 1998 represent the
     historical operations of the 62 properties; however, the Company did not
     own all of the properties throughout the periods presented and therefore
     such operations are not reflected in the Company's historical operating
     results. All such properties were owned effective March 17, 1998.

                                       20
<PAGE>

     The following tables summarize the "Same Park" operating results by major
geographic region for the three months ended September 30, 1999 and 1998:

<TABLE>
<CAPTION>
                                Revenues          Revenues       Percent           NOI               NOI         Percent
                                  1999              1998         Increase          1999             1998         Increase
                              -------------     -------------   ---------      -------------    -------------   ---------
<S>                           <C>               <C>             <C>            <C>              <C>             <C>

Southern California.......      $8,449,000        $7,439,000      13.6%          $6,061,000       $5,180,000       17.0%
Northern California.......       2,101,000         1,945,000       8.0%           1,544,000        1,374,000       12.4%
Texas.....................       1,829,000         1,714,000       6.7%             943,000          868,000        8.6%
Virginia..................       2,360,000         2,204,000       7.1%           1,608,000        1,443,000       11.4%
Maryland..................       2,291,000         2,318,000      (1.2%)          1,611,000        1,529,000        5.4%
Arizona...................         732,000           693,000       5.6%             465,000          386,000       20.5%
Other.....................         935,000           903,000       3.5%             569,000          567,000        0.4%
                              -------------     -------------   ---------      -------------    -------------   ---------
                               $18,697,000       $17,216,000       8.6%         $12,801,000      $11,347,000       12.8%
                              =============     =============   =========      =============    =============   =========
</TABLE>

          The following  tables  summarize the "Same Park" operating  results by
major geographic region for the nine months ended September 30, 1999 and 1998:

<TABLE>
<CAPTION>

                                Revenues          Revenues        Percent          NOI               NOI          Percent
                                  1999              1998         Increase          1999             1998         Increase
                              -------------     -------------   ---------      -------------    -------------   ---------
<S>                           <C>               <C>             <C>            <C>              <C>             <C>

Southern California.......     $24,023,000       $21,451,000      12.0%         $17,382,000      $14,884,000       16.8%
Northern California.......       6,139,000         5,711,000       7.5%           4,511,000        4,034,000       11.8%
Texas.....................       5,451,000         4,982,000       9.4%           2,939,000        2,579,000       14.0%
Virginia..................       6,789,000         6,447,000       5.3%           4,525,000        4,218,000        7.3%
Maryland..................       6,795,000         6,504,000       4.5%           4,719,000        4,559,000        3.5%
Arizona...................       2,097,000         2,029,000       3.4%           1,311,000        1,255,000        4.5%
Other.....................       2,731,000         2,700,000       1.1%           1,694,000        1,712,000       (1.1%)
                              -------------     -------------   ---------      -------------    -------------   ---------
                               $54,025,000       $49,824,000       8.4%         $37,081,000      $33,241,000       11.6%
                              =============     =============   =========      =============    =============   =========
</TABLE>

          The growth in the strong Southern California market was accentuated by
increasing  occupancies  in the New York Common  portfolio  acquired in December
1997.  The  performance of the Texas  facilities  reflects  improvements  in the
Austin and San  Antonio  facilities  as well as  economies  of scale  created by
substantial  square  footage  added to the  Texas  market  over the last  twelve
months.

          Facility  Management  Operations:  The Company's  facility  management
accounts for a small portion of the Company's net operating  income.  During the
three  months ended  September  30, 1999,  $97,000 in net  operating  income was
recognized from facility management  operations compared to $97,000 for the same
period in 1998. During the nine months ended September 30, 1999, $281,000 in net
operating income was recognized from facility management  operations compared to
$391,000 for the same period in 1998.  Facility  management  fees have decreased
due to the Company's acquisition of properties previously managed.

          Interest and Other Income: Interest and other income primarily reflect
earnings on cash balances. Interest and other income were $592,000 for the three
months  ended  September  30, 1999  compared to $533,000  for the same period in
1998.  Interest  and  other  income  were  $885,000  for the nine  months  ended
September 30, 1999 compared to $1,077,000  for the same period in 1998.  Average
cash balances for the three months ended  September 30, 1999 were  approximately
$47 million  compared to $41 million for the same period in 1998.  Average  cash
balances for the nine months ended  September  30, 1999 were  approximately  $24
million compared to $28 million for the same period in 1998.

                                       21
<PAGE>

          Cost of  Operations:  Cost of  operations  for the three  months ended
September 30, 1999 was $8,920,000  compared to $7,379,000 for the same period in
1998.  Cost of  operations  for the nine  months  ended  September  30, 1999 was
$25,951,000  compared  to  $18,361,000  for the same  period  in  1998.  Cost of
operations for the three months ended  September 30, 1999 consists  primarily of
property  taxes  ($2,889,000),  property  maintenance  ($1,171,000),   utilities
($1,403,000)  and direct payroll  ($1,065,000).  Cost of operations for the nine
months  ended   September  30,  1999  consists   primarily  of  property   taxes
($8,163,000),  property  maintenance  ($3,761,000),  utilities  ($3,805,000) and
direct  payroll  ($3,242,000).  The increases are due primarily to the growth in
the total  square  footage of the  Company's  portfolio of  properties.  Cost of
operations as a percentage of rental  income  decreased  from 28.8% to 27.4% and
from  29.9% to 28.0% for the three and nine  months  ended  September  30,  1999
compared to the same period in 1998,  respectively,  as a result of economies of
scale  achieved  through the  acquisition  of  properties  in  existing  markets
partially offset by an increase in property tax expense.

          Depreciation and Amortization  Expense:  Depreciation and amortization
expense for the three months ended September 30, 1999 were  $7,594,000  compared
to $4,865,000 for the same period in 1998. Depreciation and amortization expense
for the nine  months  ended  September  30,  1999 were  $21,641,000  compared to
$11,421,000  for the same period in 1998. The increase is due to the acquisition
of real estate facilities in 1998 and 1999.

          General and Administrative Expense: General and administrative expense
was $742,000 for the three months ended  September 30, 1999 compared to $593,000
for the same period in 1998. General and  administrative  expense was $2,339,000
for the nine months ended September 30, 1999 compared to $1,589,000 for the same
period  in 1998.  The  increase  is due to the  increased  size and  acquisition
activities  of the  Company.  Included in general and  administrative  costs are
acquisition costs and abandoned transaction costs.  Acquisition expenses for the
three  months ended  September  30, 1999 and 1998 were  $139,000  and  $279,000,
respectively.  Abandoned  transaction  costs were none and $11,000 for the three
months ended September 30, 1999 and 1998, respectively. Acquisition expenses for
the nine months ended  September  30, 1999 and 1998 were  $324,000 and $557,000,
respectively.  Abandoned transaction costs were $30,000 and $15,000 for the nine
months ended September 30, 1999 and 1998, respectively.

     Interest Expense:  Interest expense was $977,000 for the three months ended
September  30,  1999  compared  to  $667,000  for the same  period in 1998.  The
increase  is  attributable  to mortgage  notes  assumed in  connection  with the
acquisition of real estate facilities ($785,000 in interest expense) and line of
credit  costs  ($366,000)  net of $174,000 of interest  expense  capitalized  to
ongoing  construction  projects for the three months ended  September  30, 1999.
Interest  expense was  $2,658,000  for the nine months ended  September 30, 1999
compared to $1,736,000 for the same period in 1998. The increase is attributable
to mortgage  notes assumed in  connection  with the  acquisition  of real estate
facilities  ($2,285,000 in interest  expense) and line of credit costs and other
short tern borrowings ($957,000) net of $584,000 of interest expense capitalized
to ongoing construction projects for the nine months ended September 30, 1999.

          Minority Interest in Income:  Minority interest in income reflects the
income allocable to equity interests in the Operating  Partnership which are not
owned by the  Company.  Minority  interest in income for the three  months ended
September 30, 1999 was $4,369,000 ($1,022,000 allocated to preferred unitholders
and $3,347,000 allocated to common unitholders) compared to $3,013,000 allocated
to common  unitholders for the same period in 1998.  Minority interest in income
for the  nine  months  ended  September  30,  1999 was  $10,769,000  ($1,236,000
allocated  to  preferred   unitholders   and  $9,533,000   allocated  to  common
unitholders) compared to $8,696,000 allocated to common unitholders for the same
period in 1998.  The increase in minority  interest in income is due to improved
operating  results,  the issuance of additional  common units in connection with
the acquisition of real estate facilities and the private placement of preferred
units.

Liquidity and Capital Resources
- -------------------------------

          Net cash  provided by operating  activities  for the nine months ended
September  30,  1999 and 1998 was  $62,745,000  and  $41,842,000,  respectively.
Management believes that the Company's internally generated net cash provided by
operating  activities  will  continue to be  sufficient to enable it to meet its
operating expenses, capital improvements, debt service requirements and maintain
the current level of distribution to shareholders.

          The following table  summarizes the Company's  ability to make capital
improvements  to maintain  its  facilities  through the use of cash  provided by
operating activities. The remaining cash flow is available to the Company to pay
distributions to shareholders and to acquire property interests.

                                       22
<PAGE>

<TABLE>
<CAPTION>
                                                                         Nine months ended September 30,
                                                                              1999              1998
                                                                        ----------------  ---------------
<S>                                                                     <C>               <C>


Net income..........................................................     $   30,352,000    $  21,124,000
Depreciation and amortization.......................................         21,641,000       11,421,000
Minority interest in income.........................................         10,769,000        8,696,000
Change in working capital...........................................            (17,000)         601,000
                                                                        ----------------  ---------------
Net cash provided by operating activities...........................         62,745,000       41,842,000


Maintenance capital expenditures....................................         (2,153,000)      (2,117,000)
Tenant improvements.................................................         (3,857,000)      (2,588,000)
Capitalized lease commissions.......................................         (1,479,000)      (1,325,000)
                                                                        ----------------  ---------------
Funds available for distributions to shareholders, minority
  interests, acquisitions and other corporate purposes..............         55,256,000       35,812,000

Cash distributions to shareholders and minority interests...........        (26,667,000)     (22,145,000)
                                                                        ----------------  ---------------

Excess funds available for acquisitions and other corporate purposes     $   28,589,000    $  13,667,000
                                                                        ================  ===============
</TABLE>

          The Company's  capital  structure is  characterized  by a low level of
leverage.  As of September  30, 1999,  the Company had nine fixed rate  mortgage
notes  payable  totaling   $45,828,000   which   represented  5%  of  its  total
capitalization (based on book value, including minority interests and debt). The
weighted average interest rate for the mortgage notes is 7.92%.

     The Company  extended its unsecured line of credit (the "Credit  Facility")
with Wells Fargo Bank. The Credit Facility has a borrowing limit of $100 million
and a revised  expiration  date of August 6, 2002.  The  expiration  date may be
extended by one year on each  anniversary of the Credit  Agreement.  Interest on
outstanding  borrowings is payable  monthly.  At the option of the Company,  the
rate of interest  charged is equal to (i) the prime rate or (ii) a rate  ranging
from the London Interbank  Offered Rate ("LIBOR") plus 0.75% to LIBOR plus 1.35%
depending on the  Company's  credit  ratings and interest  coverage  ratios,  as
defined  (currently LIBOR plus 1.00%).  In addition,  the Company is required to
pay an annual commitment fee of 0.25%.

          The  Company  expects to fund its  growth  strategies  with  permanent
capital,  including  issuances  of common  and  preferred  stock and  internally
generated  retained  cash  flows.  The Company  may  finance  acquisitions  on a
temporary basis with borrowings from its line of credit.  The Company intends to
repay amounts  borrowed under the credit facility from  undistributed  cash flow
or, as market conditions  permit and as determined to be advantageous,  from the
public or private  placement of preferred and common stock or formation of joint
ventures.  The  Company  targets  a  leverage  ratio  of 40%  and a  Funds  from
Operations ("FFO") to combined fixed charges and preferred  distributions  ratio
of 3.0 to 1.0. As of September 30, 1999 and for the nine months then ended,  the
leverage  ratio was 22% and the FFO to  combined  fixed  charges  and  preferred
distributions coverage ratio was 9.5 to 1.0.

          In April 1999, the Company  completed a private placement of preferred
OP units and a public  offering of  depositary  shares  representing  fractional
interests in perpetual  preferred stock resulting in net proceeds totaling $65.6
million.  The net proceeds from the  placement of preferred OP units,  completed
April 23, 1999 were approximately  $12.5 million and the preferred OP units have
a preferred distribution rate of 8 7/8% on a stated value of $12.75 million. The
preferred OP units have equivalent terms to those of perpetual  preferred stock.
Net proceeds from the public perpetual  preferred stock offering completed April
30, 1999 were $53.1  million,  and the preferred  stock has a dividend rate of 9
1/4% on a stated value of $55 million.  Proceeds from the issuances were used to
pay off borrowings  from an affiliate and a portion was used to repay a mortgage
note payable of approximately $11 million. The remaining proceeds have been used
for investment in real estate.

          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  and part of the  proceeds  will be used to prepay a mortgage  note
payable of approximately $8.5 million.

                                       23
<PAGE>

          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.

          Funds  from  Operations:  FFO is defined as net  income,  computed  in
accordance  with  generally  accepted  accounting  principles  ("GAAP"),  before
depreciation,  amortization,  minority  interest in income,  straight  line rent
adjustments and  extraordinary or non-recurring  items. FFO is presented because
the Company considers FFO to be a useful measure of the operating performance of
a REIT which,  together with net income and cash flows provide  investors with a
basis to evaluate the operating and cash flow  performances  of a REIT. FFO does
not represent net income or cash flows from  operations as defined by GAAP.  FFO
does  not take  into  consideration  scheduled  principal  payments  on debt and
capital improvements.  Accordingly, FFO is not necessarily a substitute for cash
flow or net income as a measure of liquidity or operating performance or ability
to make acquisitions and capital improvements or ability to pay distributions or
debt principal payments.  Also, FFO as computed and disclosed by the Company may
not be comparable to FFO computed and disclosed by other REITs.

         FFO for the Company is computed as follows:

<TABLE>
<CAPTION>
                                                                         Nine months ended September 30,
                                                                              1999              1998
                                                                        ----------------  ---------------
<S>                                                                     <C>               <C>

Net income allocable to common shareholders........................       $  28,218,000     $  21,124,000
  Depreciation and amortization....................................          21,641,000        11,421,000
  Minority interest in income - common units.......................           9,533,000         8,696,000
  Less effects of straight-line rents..............................          (2,544,000)         (924,000)
                                                                        ----------------  ---------------
Consolidated FFO allocable to common shareholders and common
unitholders........................................................          56,848,000        40,317,000

FFO allocated to minority interest - common units..................         (13,179,000)      (11,757,000)
                                                                        ----------------  ---------------

FFO allocated to common shareholders...............................      $   43,669,000    $   28,560,000
                                                                        ================  ===============
</TABLE>

     Capital Expenditures:  During the nine months ended September 30, 1999, the
Company  incurred a total of $7.5 million in maintenance  capital  expenditures,
tenant improvements and capitalized lease commissions.  In addition, the Company
made $2.6 million of renovation  expenditures.  On a recurring annual basis, the
Company expects $0.90 to $1.20 per square foot in recurring  maintenance capital
expenditures,  tenant improvements and capitalized lease commissions. During the
remainder  of 1999,  the  Company  expects  to make an  additional  $400,000  in
additional expenditures to continue renovation on two properties in Texas.

          Distributions:  The  Company  has  elected and intends to qualify as a
REIT for federal income tax purposes.  As a REIT,  the Company must meet,  among
other tests,  sources of income,  share  ownership and certain  asset tests.  In
addition,  the Company is not taxed on that portion of its taxable  income which
is  distributed  to its  shareholders  provided that at least 95% of its taxable
income is so distributed to its shareholders prior to filing of its tax return.

          The Board of  Directors  declared a  quarterly  dividend  of $0.25 per
common  share on November 9, 1999.  The Board of  Directors  has  established  a
distribution  policy to maximize the retention of cash flow and only  distribute
the minimum  amount  required  for the  Company to maintain  its tax status as a
REIT.  In  addition,  the Board of  Directors  declared a quarterly  dividend of
$0.578125 per share on the 2,200,000 depositary shares each representing 1/1,000
of a share of 9 1/4% Cumulative  Preferred Stock,  Series A.  Distributions  are
payable  on  December  31,  1999 to  shareholders  of  record as of the close of
business on December 15, 1999.

                                       24
<PAGE>

Impact of Year 2000
- -------------------

          The Company  utilizes PSI's  information  systems in connection with a
cost sharing and  administrative  services  agreement.  The Company and PSI have
completed  an  assessment  of all  of its  hardware  and  software  applications
including  those  affecting  the Company to identify  susceptibility  to what is
commonly  referred to as the "Y2K issue" whereby certain computer  programs have
been using two digits rather than four to define the  applicable  year.  Certain
computer   programs  or  hardware   with  the  Y2K  issue  have   date-sensitive
applications  or embedded chips that may recognize a date using "00" as the year
1900 rather than the year 2000,  resulting in  miscalculations or system failure
causing disruptions to operations.

          The Company in conjunction with PSI has two phases in its process with
respect to each of its  systems;  i)  assessment,  whereby  the  Company and PSI
evaluate  whether the system is Y2K  compliant  and  identify the plan of action
with respect to remediating  any Y2K issues  identified and ii)  implementation,
whereby  the  Company  and PSI  complete  the  plan of  action  prepared  in the
assessment phase and verify that Y2K compliance has been achieved.

          Implementations  have been completed for PSI's  critical  applications
that impact the Company,  including its general ledger and related systems, that
are believed to have Y2K issues.  Contingency  plans have been developed for use
in  case  the  assessment  did not  identify  all  such  Y2K  issues,  or if the
implementation  were  subsequently  determined to not fully remediate Y2K issues
that were identified.  The Company presently believes that the impact of the Y2K
issue on its system can be  mitigated.  However,  if the plan for  ensuring  Y2K
compliance and the related  contingency plans were to fail, be insufficient,  or
not be  implemented  on a  timely  basis,  operations  of the  Company  could be
materially impacted.

          Certain of the Company's other  non-computer  related systems that may
be impacted by the Y2K issue,  such as security  systems,  have been  evaluated.
Based upon its  evaluation,  the Company  has no reason to believe  that lack of
compliance  or  failure  of  required  solutions  would  materially  impact  its
operations.

          The Company exchanges  electronic data with certain outside vendors in
the banking and payroll  processing areas. The Company has been advised by these
vendors that their  systems are Y2K  compliant.  The Company is not aware of any
other vendors,  suppliers,  or other external agents with a Y2K issue that would
materially  impact the Company's  results of operations,  liquidity,  or capital
resources.  However,  the Company has no means of ensuring that external  agents
will be Y2K  compliant,  and  there can be no  assurance  that the  Company  has
identified  all such  external  agents.  The  inability  of  external  agents to
complete  their Y2K  compliance  process in a timely  fashion  could  materially
impact the  Company.  The effect of  non-compliance  by  external  agents is not
determinable.

          The total cost of PSI's Y2K  compliance  activities  (which  primarily
consists of the costs of  implementing  new  systems)  will be  allocated to all
entities  that use the PSI computer  systems.  The amount to be allocated to the
Company is estimated at approximately $250,000.

          The costs of the  projects  and the date on which PSI and the  Company
expect to achieve Y2K compliance are based upon management's best estimates, and
were derived utilizing  numerous  assumptions of future events.  There can be no
assurance that these estimates will be achieved, and actual results could differ
materially  from those  anticipated.  There can be no assurance that PSI and the
Company have identified all potential Y2K issues either within the Company or at
external  agents.  In  addition,  the  impact of the Y2K  issue on  governmental
entities and utility providers and the resultant impact on the Company,  as well
as disruptions in the general economy,  may be material but cannot be reasonably
determined or quantified.

                                       25
<PAGE>

Item 3.  Quantitative and Qualitative Disclosures about Market Risk
         ----------------------------------------------------------

          To  limit  the  Company's   exposure  to  market  risk,   the  Company
principally  finances its operations  and growth with  permanent  equity capital
consisting  of either  common or preferred  stock.  At September  30, 1999,  the
Company's  debt as a percentage of  shareholders'  equity (based on book values)
was 8.3%.

          The Company's market risk sensitive instruments include mortgage notes
payable which totaled  $45,828,000 at September 30, 1999.  Substantially  all of
the Company's mortgage notes payable bear interest at fixed rates. See Note 7 of
the Notes to Condensed Consolidated  Financial Statements for terms,  valuations
and  approximate  principal  maturities  of the  mortgage  notes  payable  as of
September 30, 1999. Based on borrowing rates currently available to the Company,
the carrying amount of debt approximates fair value.

                                       26
<PAGE>

PART II. OTHER INFORMATION

Item 1.  Legal Proceedings
         -----------------

        PS Business Parks, L.P. v. Principal Mutual Life Insurance Company, et
        ----------------------------------------------------------------------
al., Circuit Court of Washington County, Oregon (filed April 29, 1999)
- ---

          In May 1998, the Company acquired a property in Beaverton,  Oregon. An
adjacent property is the subject of an environmental remedial investigation. For
additional information on the investigation,  please refer to the Company's 1998
annual report on Form 10-K under "Item 7.  Management's  Discussion and Analysis
of Financial  Condition  and Results of Operations - Risk Factors - Our Business
Could Be Subject to Environmental Liabilities."

          In April 1999, the Company  commenced an action against the sellers of
the property  seeking  indemnification  for any damages and expenses that may be
incurred by the Company in this matter and for other relief.  The Company is not
currently able to quantify the extent of such damages and expenses.

Item 6.  Exhibits and Reports on Form 8-K
         --------------------------------

         (a)   Exhibits

2.1      Amended and Restated Agreement and Plan of Reorganization among
         Registrant, American Office Park Properties, Inc. ("AOPP") and Public
         Storage, Inc. ("PSI") dated as of December 17, 1997. Filed with
         Registrant's Registration Statement No. 333-45405 and incorporated
         herein by reference.

3.1      Restated Articles of Incorporation. Filed with Registrant's
         Registration Statement No. 333-78627 and incorporated herein by
         reference.

3.2      Certificate of Determination of Preferences of 8 3/4% Series C
         Cumulative Redeemable Preferred Stock of PS Business Parks, Inc. Filed
         herewith.

3.3      Certificate of Determination of Preferences of 8 7/8% Series X
         Cumulative Redeemable Preferred Stock of PS Business Parks, Inc. Filed
         herewith.

3.4      Amendment to Certificate of Determination of Preferences of 8 7/8%
         Series X Cumulative Redeemable Preferred Stock of PS Business Parks,
         Inc. Filed herewith.

3.5      Restated Bylaws. Filed with Registrant's Current Report on Form 8-K
         dated March 17, 1998 and incorporated herein by reference.

10.1     Amended Management Agreement between Storage Equities, Inc. and Public
         Storage Commercial Properties Group, Inc. dated as of February 21,
         1995. Filed with PSI's Annual Report on Form 10-K for the year ended
         December 31, 1994 and incorporated herein by reference.

10.2     Registrant's 1997 Stock Option and Incentive Plan. Filed with
         Registrant's Registration Statement No. 333-48313 and incorporated
         herein by reference.

10.3     Agreement of Limited Partnership of PS Business Parks, L.P. Filed with
         Registrant's Quarterly Report on Form 10-Q for the quarterly period
         ended June 30, 1998 and incorporated herein by reference.

10.4     Merger and Contribution Agreement dated as of December 23, 1997 among
         Acquiport Two Corporation, Acquiport Three Corporation, New York State
         Common Retirement Fund, American Office Park Properties, L.P., AOPP and
         AOPP Acquisition Corp. Three. Filed with Registrant's Registration
         Statement No. 333-45405 and incorporated herein by reference.

                                       27
<PAGE>

10.5     Agreement Among Shareholders and Company dated as of December 23, 1997
         among Acquiport Two Corporation, AOPP, American Office Park Properties,
         L.P. and PSI. Filed with Registrant's Registration Statement No.
         333-45405 and incorporated herein by reference.

10.6     Amendment to Agreement Among Shareholders and Company dated as of
         January 21, 1998 among Acquiport Two Corporation, AOPP, American Office
         Park Properties, L.P. and PSI. Filed with Registrant's Registration
         Statement No. 333-45405 and incorporated herein by reference.

10.7     Non-Competition Agreement dated as of December 23, 1997 among PSI,
         AOPP, American Office Park Properties, L.P. and Acquiport Two
         Corporation. Filed with Registrant's Registration Statement No.
         333-45405 and incorporated herein by reference.

10.8     Employment Agreement between AOPP and Ronald L. Havner, Jr. dated as of
         December 23, 1997. Filed with Registrant's Registration Statement No.
         333-45405 and incorporated herein by reference.

10.9     Employment Agreement between AOPP and Mary Jayne Howard dated as of
         December 23, 1997. Filed with Registrant's Registration Statement No.
         333-45405 and incorporated herein by reference.

10.10    Employment Agreement between Registrant and J. Michael Lynch dated as
         of May 20, 1998. Filed with Registrant's Quarterly Report on Form 10-Q
         for the quarterly period ended June 30, 1998 and incorporated herein by
         reference.

10.11    Common Stock Purchase Agreement dated as of January 23, 1998 among AOPP
         and the Investors signatory thereto. Filed with Registrant's
         Registration Statement No. 333-45405 and incorporated herein by
         reference.

10.12    Registration Rights Agreement dated as of January 30, 1998 among AOPP
         and the Investors signatory thereto. Filed with Registrant's
         Registration Statement No. 333-45405 and incorporated herein by
         reference.

10.13    Registration Rights Agreement dated as of March 17, 1998 between
         Registrant and Acquiport Two Corporation ("Acquiport Registration
         Rights Agreement"). Filed with Registrant's Quarterly Report on Form
         10-Q for the quarterly period ended June 30, 1998 and incorporated
         herein by reference.

10.14    Letter dated May 20, 1998 relating to Acquiport Registration Rights
         Agreement. Filed with Registrant's Quarterly Report on Form 10-Q for
         the quarterly period ended June 30, 1998 and incorporated herein by
         reference.

10.15    Revolving Credit Agreement dated August 6, 1998 among PS Business
         Parks, L.P., Wells Fargo Bank, National Association, as Agent, and the
         Lenders named therein. Filed with Registrant's Quarterly Report on Form
         10-Q for the quarterly period ended June 30, 1998 and incorporated
         herein by reference.

10.16    First Amendment to Revolving Credit Agreement dated as of August 19,
         1999 among PS Business Parks, L.P., Wells Fargo Bank, National
         Association, as Agent, and the Lenders named therein. Filed herewith.

10.17    Form of Indemnity Agreement. Filed with Registrant's Quarterly Report
         on Form 10-Q for the quarterly period ended March 31, 1998 and
         incorporated herein by reference.

10.18    Cost Sharing and Administrative Services Agreement dated as of November
         16, 1995 by and among PSCC, Inc. and the owners listed therein. Filed
         with Registrant's Quarterly Report on Form 10-Q for the quarterly
         period ended March 31, 1998 and incorporated herein by reference.

10.19    Amendment to Cost Sharing and Administrative Services Agreement dated
         as of January 2, 1997 by and among PSCC, Inc. and the owners listed
         therein. Filed with Registrant's Quarterly Report on Form 10-Q for the
         quarterly period ended March 31, 1998 and incorporated herein by
         reference.

                                       28
<PAGE>

10.20    Accounts Payable and Payroll Disbursement Services Agreement dated as
         of January 2, 1997 by and between PSCC, Inc. and American Office Park
         Properties, L.P. Filed with Registrant's Quarterly Report on Form 10-Q
         for the quarterly period ended March 31, 1998 and incorporated herein
         by reference.

10.21    Amendment to Agreement of Limited Partnership of PS Business Parks,
         L.P. Relating to 8 7/8% Series B Cumulative Redeemable Preferred Units,
         dated as of April 23, 1999. Filed with Registrant's Quarterly Report on
         Form 10-Q for the quarterly period ended March 31, 1999 and
         incorporated herein by reference.

10.22    Amendment to Agreement of Limited Partnership of PS Business Parks,
         L.P. Relating to 9 1/4% Series A Cumulative Redeemable Preferred Units,
         dated as of April 30, 1999. Filed with Registrant's Quarterly Report on
         Form 10-Q for the quarterly period ended March 31, 1999 and
         incorporated herein by reference.

10.23    Amendment to Agreement of Limited Partnership of PS Business Parks,
         L.P. Relating to 83/4% Series C Cumulative Redeemable Preferred Units,
         dated as of September 3, 1999. Filed herewith.

10.24    Amendment to Agreement of Limited Partnership of PS Business Parks,
         L.P. Relating to 8 7/8% Series X Cumulative Redeemable Preferred Units,
         dated as of September 7, 1999. Filed herewith.

10.25    Amendment to Agreement of Limited Partnership of PS Business Parks,
         L.P. Relating to Additional 8 7/8% Series X Cumulative Redeemable
         Preferred Units, dated as of September 23, 1999. Filed herewith.

11       Statement re: Computation of Earnings per Share. Filed herewith.

12       Statement re: Computation of Ratio of Earnings to Fixed Charges. Filed
         herewith.

27       Financial Data Schedule. Filed herewith.

         (b)   Reports on Form 8-K

               None.

                                       29
<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 thereunto duly authorized.

                                           Dated:  November 10, 1999

                                           PS BUSINESS PARKS, INC.

                                           By: /s/ Jack Corrigan
                                               -------------------------
                                               Jack Corrigan
                                               Vice President and
                                               Chief Financial Officer

                                       30


                                                                     Exhibit 3.2

                   CERTIFICATE OF DETERMINATION OF PREFERENCES
                                       OF
                      8 3/4% SERIES C CUMULATIVE REDEEMABLE
                                 PREFERRED STOCK
                                       OF
                             PS BUSINESS PARKS, INC.

        [As  filed in the  office  of the  Secretary  of  State of the  State of
California on September 3, 1999]

        The undersigned, David Goldberg and Jack E. Corrigan, Vice President and
Secretary,  respectively,  of PS BUSINESS PARKS, INC., a California corporation,
do hereby certify:

        FIRST:  The  Restated  Articles  of  Incorporation  of  the  Corporation
authorize  the  issuance of  50,000,000  shares of stock  designated  "preferred
shares,"  issuable  from time to time in one or more series,  and  authorize the
Board of Directors to fix the number of shares constituting any such series, and
to determine or alter the dividend  rights,  dividend rate,  conversion  rights,
voting  rights,   right  and  terms  of  redemption   (including   sinking  fund
provisions),  the redemption  price or prices and the liquidation  preference of
any wholly  unissued series of such preferred  shares,  and the number of shares
constituting any such series.

        SECOND:  The Board of  Directors of the  Corporation  did duly adopt the
resolutions  attached hereto as Exhibit A and  incorporated  herein by reference
authorizing and providing for the creation of a series of preferred shares to be
known as "8 3/4% Series C Cumulative  Redeemable  Preferred Stock" consisting of
3,200,000 shares, none of the shares of such series having been issued.

        We further  declare under penalty of perjury under the laws of the State
of  California  that the  matters  set  forth in this  certificate  are true and
correct of our own knowledge.

        IN WITNESS WHEREOF,  the undersigned have executed this certificate this
3rd day of September, 1999.


                                        /s/ David Goldberg
                                        --------------------------
                                        David Goldberg, Vice President


                                        /s/ Jack E. Corrigan
                                        --------------------------
                                        Jack E. Corrigan, Secretary


<PAGE>

                                    EXHIBIT A

                      RESOLUTION OF THE BOARD OF DIRECTORS
                           OF PS BUSINESS PARKS, INC.

                    ESTABLISHING A SERIES OF 8 3/4% SERIES C
                      CUMULATIVE REDEEMABLE PREFERRED STOCK


        RESOLVED  that  pursuant to the  authority  conferred  upon the Board of
Directors  by Article  III of the  Restated  Articles of  Incorporation  of this
Corporation,  there is hereby  established a series of the authorized  preferred
shares of this  Corporation  having a par value of $.01 per share,  which series
shall be designated  "8 3/4% Series C Cumulative  Redeemable  Preferred  Stock,"
shall  consist  of  3,200,000  shares  and  shall  have  the  following  rights,
preferences and privileges:

        1. Rank. The 8 3/4% Series C Cumulative  Redeemable Preferred Stock (the
"Series C Preferred  Stock") will, with respect to distributions and rights upon
voluntary  or  involuntary   liquidation,   winding-up  or  dissolution  of  the
Corporation,  or both, rank senior to all classes or series of Common Shares and
to all  classes  or  series  of  equity  securities  of the  Corporation  now or
hereafter authorized,  issued or outstanding,  other than any class or series of
equity securities of the Corporation expressly designated as ranking on a parity
with or senior to the Series C Preferred  Stock as to  distributions  and rights
upon  voluntary or  involuntary  liquidation,  winding-up or  dissolution of the
Corporation. For purposes of this Certificate of Determination, the term "Parity
Preferred  Stock" shall be used to refer to any class or series of capital stock
of the Corporation now or hereafter authorized,  issued or outstanding expressly
designated by the  Corporation to rank on a parity with Series C Preferred Stock
with  respect  to  distributions   and  rights  upon  voluntary  or  involuntary
liquidation,  winding-up  or  dissolution  of  the  Corporation  (including  the
Corporation's 9 1/4% Cumulative  Preferred  Stock,  Series A and 8 7/8% Series B
Cumulative  Redeemable Preferred Stock). For purposes of the preceding sentence,
"capital  stock"  means any  equity  securities  (including  Common  Shares  and
Preferred Stock),  shares,  participation or other ownership  interests (however
designated)  and any rights  (other  than debt  securities  convertible  into or
exchangeable for equity securities) or options to purchase any of the foregoing.

        2. Distribution  Rights.  (a) Payment of  Distributions.  Subject to the
rights of holders of Parity Preferred Stock as to the payment of  distributions,
holders of Series C  Preferred  Stock  shall be entitled to receive the Series C
Priority  Return,  when,  as and if  declared by the Board of  Directors  of the
Corporation,  out of funds legally  available for the payment of  distributions.
Such distributions  shall be cumulative,  shall accrue from the original date of
issuance of the Series C Preferred  Stock and will be payable (A)  quarterly  in
arrears,  on March 1, June 1, September 1 and December 1 of each year commencing
on the first such date  following the date of issuance of such stock and, (B) in
the event of a redemption,  on the  redemption  date (each a "Series C Preferred
Stock Distribution  Payment Date"). If any Series C Preferred Stock Distribution
Payment  Date is not a Business  Day (as defined  herein),  then  payment of the
distribution  to be  made on  such  date  shall  be  made  on the  Business  Day
immediately preceding such Series C Preferred Stock Distribution Payment Date in
each case with the same force and effect as if made on such date.  Distributions
on the Series C  Preferred  Stock  will be made to the  holders of record of the
Series C Preferred  Stock on the relevant  record dates to be fixed by the Board
of  Directors of the  Corporation,  which record dates shall in no event be more
than 45 days or less than 15 days prior to the relevant Series C Preferred Stock
Distribution Payment Date (each a "Distribution Record Date").

        For purposes of this Certificate of  Determination,  the following terms
shall have the meanings set forth herein:  (i)  "Liquidation  Preference"  shall
mean, with respect to the Series C Preferred Stock, $25.00 per share of Series C
Preferred Stock, plus the amount of any accumulated and unpaid Series C Priority
Return (as  hereinafter  defined)  with  respect to such  share,  whether or not
declared, minus any distributions in excess of the Series C Priority Return that
has  occurred  with  respect to such  Series C Preferred  Units,  to the date of
payment;  (ii) "Series C Priority  Return"  shall mean an amount equal to 8 3/4%
per annum of the Liquidation  Preference per share of Series C Preferred  Stock,
commencing  on the date of issuance  of such share of Series C Preferred  Stock,
determined  on the basis of a 360-day year of twelve  30-day months (and for any
period  shorter  than  a full  quarterly  period  for  which  distributions  are
computed,  the amount of the distribution  payable will be computed based on the
ratio of the actual  number of days elapsed in such period to ninety (90) days),
cumulative  to the  extent  not  distributed  on any  Series C  Preferred  Stock
Distribution  Payment  Date plus the per share  amount  accrued on each share of
Series C  Preferred  Stock on the date of issuance of such shares in exchange of
Series C Preferred Units of PS Business Parks, L.P. corresponding to the accrued
and unpaid priority return on such Preferred  Units, if any; and (iii) "Business
Day" shall mean each day, other than a Saturday or a Sunday,  which is not a day
on which banking  institutions  in New York, New York are authorized or required
by law, regulation or executive order to close.

        (b) Prohibition on Distributions. No distributions on Series C Preferred
Stock shall be authorized by the Board of Directors of the  Corporation  or paid
or set apart for  payment by the  Corporation  at any such time as the terms and
provisions of any agreement of the Corporation  including any agreement relating
to  indebtedness,  prohibits  such  authorization,  payment or setting apart for
payment or  provides  that such  authorization,  payment  or  setting  apart for
payment would  constitute a breach  thereof or a default  thereunder,  or to the
extent that such  authorization  or payment shall be restricted or prohibited by
law.

        (c)  Distributions  Cumulative.  Distributions on the Series C Preferred
Stock will accrue  whether or not the terms and  provisions  of any agreement of
the  Corporation,  including any agreement  relating to its  indebtedness at any
time  prohibits  the  current  payment  of  distributions,  whether  or not  the
Corporation has earnings,  whether or not there are funds legally  available for
the  payment of such  distributions  and whether or not such  distributions  are
authorized  or  declared.  Accrued  but  unpaid  distributions  on the  Series C
Preferred Stock will accumulate as of the Series C Preferred Stock  Distribution
Payment Date on which they first  become  payable.  Distributions  on account of
arrears for any past distribution  periods may be declared and paid at any time,
without  reference to a regular Series C Preferred  Stock  Distribution  Payment
Date to  holders of record of the Series C  Preferred  Stock on the record  date
fixed by the Board of  Directors  which  date  shall  not  exceed  fifteen  (15)
business days prior to the payment date.  Accumulated  and unpaid  distributions
will not bear interest.

        (d) Priority as to Distributions.  (i) So long as any Series C Preferred
Stock  is  outstanding,  no  distribution  of cash or  other  property  shall be
authorized,  declared,  paid or set apart for payment on or with  respect to any
class or series of  Common  Shares or any class or series of other  stock of the
Corporation  ranking  junior as to the payment of  distributions  or rights upon
voluntary  or  involuntary   dissolution,   liquidation  or  winding-up  of  the
Corporation to the Series C Preferred  Stock (such Common Shares or other junior
stock,  collectively,  "Junior Stock"),  nor shall any cash or other property be
set aside for or applied to the purchase,  redemption or other  acquisition  for
consideration of any Series C Preferred Stock, any Parity Preferred Stock or any
Junior Stock, unless, in each case, all distributions  accumulated on all Series
C Preferred  Stock and all classes and series of  outstanding  Parity  Preferred
Stock have been paid in full.  The  foregoing  sentence  shall not  prohibit (i)
distributions  payable solely in Junior Stock, and (ii) the conversion of Series
C Preferred  Stock,  Junior  Stock or Parity  Preferred  Stock into stock of the
Corporation ranking junior to the Series C Preferred Stock as to distributions.

        (ii) So long as  distributions  have  not  been  paid in full  (or a sum
sufficient  for such full  payment  is not  irrevocably  deposited  in trust for
payment) upon the Series C Preferred  Stock,  all  distributions  authorized and
declared  on the  Series  C  Preferred  Stock  and  all  classes  or  series  of
outstanding  Parity  Preferred  Stock  with  respect to  distributions  shall be
authorized  and  declared  so that the amount of  distributions  authorized  and
declared per share of Series C Preferred  Stock and such other classes or series
of Parity  Preferred  Stock shall in all cases bear to each other the same ratio
that accrued  distributions  per share on the Series C Preferred  Stock and such
other classes or series of Parity  Preferred  Stock (which shall not include any
accumulation in respect of unpaid  distributions for prior distribution  periods
if such  class or  series  of  Parity  Preferred  Stock  do not have  cumulative
distribution rights) bear to each other.

        (e) No Further Rights.  Holders of Series C Preferred Stock shall not be
entitled  to any  distributions,  whether  payable in cash,  other  property  or
otherwise, in excess of the full cumulative distributions described herein.

        3. Liquidation. (a) Payment of Liquidating Distributions. Subject to the
rights of holders of Parity  Preferred  Stock  with  respect to rights  upon any
voluntary  or  involuntary   liquidation,   dissolution  or  winding-up  of  the
Corporation  and subject to any series of capital  stock  ranking  senior to the
Series  C  Preferred  Stock  with  respect  to  rights  upon  any  voluntary  or
involuntary  liquidation,  dissolution  or  winding-up of the  Corporation,  the
holders of Series C  Preferred  Stock  shall be  entitled  to receive out of the
assets of the  Corporation  legally  available for  distribution or the proceeds
thereof,  after  payment or  provision  for debts and other  liabilities  of the
Corporation, but before any payment or distributions of the assets shall be made
to  holders  of  Common  Shares  or any  other  class or series of shares of the
Corporation  that ranks junior to the Series C Preferred Stock as to rights upon
liquidation,  dissolution or winding-up of the  Corporation,  an amount equal to
the Liquidation  Preference per share of Series C Preferred  Stock. If upon such
voluntary or  involuntary  liquidation,  dissolution  or  winding-up,  there are
insufficient  assets to permit full payment of liquidating  distributions to the
holders of Series C Preferred Stock and any Parity  Preferred Stock as to rights
upon liquidation,  dissolution or winding-up of the Corporation, all payments of
liquidating  distributions  on the  Series C  Preferred  Stock  and such  Parity
Preferred  Stock  shall be made so that the  payments  on the Series C Preferred
Stock and such Parity  Preferred Stock shall in all cases bear to each other the
same ratio that the respective  rights of the Series C Preferred  Stock and such
other  Parity  Preferred  Stock  (which  shall not include any  accumulation  in
respect of unpaid  distributions for prior  distribution  periods if such Parity
Preferred Stock does not have cumulative  distribution rights) upon liquidation,
dissolution or winding-up of the Corporation bear to each other.

      (b)  Notice.  Written  notice  of  any  such  voluntary  or  involuntary
liquidation,  dissolution or winding-up of the Corporation,  stating the payment
date or dates when, and the place or places where, the amounts  distributable in
such circumstances shall be payable, shall be given by (i) fax and (ii) by first
class mail,  postage pre-paid,  not less than 10 and not more than 60 days prior
to the  payment  date  stated  therein,  to each  record  holder of the Series C
Preferred  Stock at the  respective  addresses of such holders as the same shall
appear on the share transfer records of the Corporation.

        (c)  No  Further  Rights.  After  payment  of  the  full  amount  of the
liquidating  distributions  to which they are entitled,  the holders of Series C
Preferred  Stock will have no right or claim to any of the  remaining  assets of
the Corporation.

        (d) Consolidation,  Merger or Certain Other Transactions.  The voluntary
sale,  conveyance,  lease,  exchange  or  transfer  (for cash,  shares of stock,
securities or other  consideration)  of all or substantially all of the property
or  assets  of the  Corporation  to,  or the  consolidation  or  merger or other
business combination of the Corporation with or into, any corporation,  trust or
other  entity (or of any  corporation,  trust or other  entity  with or into the
Corporation)  or a statutory  share exchange shall not be deemed to constitute a
liquidation, dissolution or winding-up of the Corporation.

        4. Optional Redemption.  (a) Right of Optional Redemption.  The Series C
Preferred Stock may not be redeemed prior to September 3, 2004. On or after such
date,  the  Corporation  shall have the right to redeem  the Series C  Preferred
Stock,  in whole (but not in part),  at any time, upon not less than 30 nor more
than 60 days' written notice, at a redemption  price,  payable in cash, equal to
the Liquidation Preference (the "Series C Redemption Price").

        (b)  Limitation  on  Redemption.  The  redemption  price of the Series C
Preferred  Stock will be  payable  solely to the extent  such  payment  would be
permitted as a distribution under the California Corporations Code.

        (c)  Procedures  for  Redemption.  (i) Notice of redemption  will be (i)
faxed, and (ii) mailed by the Corporation, postage prepaid, not less than 30 nor
more than 60 days prior to the  redemption  date,  addressed  to the  respective
holders  of record  of the  Series C  Preferred  Stock to be  redeemed  at their
respective  addresses as they appear on the transfer records of the Corporation.
No failure to give or defect in such  notice  shall  affect the  validity of the
proceedings  for the redemption of any Series C Preferred Stock except as to the
holder to whom such  notice was  defective  or not  given.  In  addition  to any
information  required by law or by the  applicable  rules of any  exchange  upon
which the Series C Preferred  Stock may be listed or  admitted to trading,  each
such notice shall state:  (i) the redemption  date,  (ii) the redemption  price,
(iii) the number of shares of Series C Preferred Stock to be redeemed,  (iv) the
place or  places  where  such  shares  of  Series C  Preferred  Stock  are to be
surrendered for payment of the redemption  price, (v) that  distributions on the
Series C  Preferred  Stock to be  redeemed  will  cease  to  accumulate  on such
redemption  date  and  (vi)  that  payment  of  the  redemption  price  and  any
accumulated  and  unpaid  distributions  will  be  made  upon  presentation  and
surrender of such Series C Preferred Stock.

        (ii) If the  Corporation  gives a notice of  redemption  in  respect  of
Series C Preferred Stock (which notice will be irrevocable) then, by 12:00 noon,
New York City  time,  on the  redemption  date,  the  Corporation  will  deposit
irrevocably  in trust for the  benefit of the  Series C  Preferred  Stock  being
redeemed funds sufficient to pay the applicable  Series C Redemption  Price, and
will give irrevocable instructions and authority to pay such Series C Redemption
Price to the  holders of the Series C  Preferred  Stock  upon  surrender  of the
certificate evidencing the Series C Preferred Stock by such holders at the place
designated  in the notice of  redemption.  On and after the date of  redemption,
distributions  will cease to accumulate  on the Series C Preferred  Stock called
for redemption,  unless the Corporation  defaults in the payment thereof. If any
date fixed for  redemption  of Series C Preferred  Stock is not a Business  Day,
then payment of the  redemption  price  payable on such date will be made on the
next  succeeding  day that is a Business  Day (and without any interest or other
payment in respect of any such delay) except that, if such Business Day falls in
the next calendar year, such payment will be made on the  immediately  preceding
Business  Day,  in each case with the same  force and  effect as if made on such
date fixed for  redemption.  If payment of the Series C Redemption  Price or any
accumulated or unpaid  distributions  in respect of the Series C Preferred Stock
is improperly withheld or refused and not paid by the Corporation, distributions
on such Series C Preferred  Stock will continue to accumulate  from the original
redemption  date to the date of payment,  in which case the actual  payment date
will be considered the date fixed for redemption for purposes of calculating the
applicable Series C Redemption Price.

        (d) Status of Redeemed Stock. Any Series C Preferred Stock that shall at
any time have been  redeemed  shall  after such  redemption,  have the status of
authorized  but unissued  Preferred  Stock,  without  designation as to class or
series until such shares are once more designated as part of a particular  class
or series by the Board of Directors.

        5. Voting Rights.  (a) General.  Holders of the Series C Preferred Stock
will not have any voting rights, except as set forth below.

        (b) Right to Elect Directors.  If the Corporation shall fail to pay full
cumulative  dividends  on the shares of Series C  Preferred  Stock or any of its
preferred  shares for six quarterly  dividend  payment  periods,  whether or not
consecutive (a "Dividend  Default"),  the holders of all  outstanding  preferred
shares,  voting as a single class without regard to series,  will be entitled to
elect two  Directors  until  full  cumulative  dividends  for all past  dividend
payment  periods on all  preferred  shares have been paid or declared  and funds
therefor  set apart for  payment.  Such right to vote  separately  as a class to
elect Directors shall, when vested,  be subject,  always, to the same provisions
for the vesting of such right to elect  Directors  separately  as a class in the
case of future Dividend Defaults. At any time when such right to elect Directors
separately as a class shall have so vested,  the Corporation may call, and, upon
the  written  request of the holders of record of not less than 20% of the total
number of preferred  shares of the Corporation then  outstanding,  shall call, a
special  meeting of stockholders  for the election of Directors.  In the case of
such a written request,  such special meeting shall be held within 90 days after
the  delivery of such  request  and, in either  case,  at the place and upon the
notice provided by law and in the Bylaws of the  Corporation;  provided that the
Corporation shall not be required to call such a special meeting if such request
is received less than 120 days before the date fixed for the next ensuing Annual
Meeting of  Shareholders  of the  Corporation  and the holders of all classes of
outstanding  preferred  shares  are  afforded  the  opportunity  to  elect  such
Directors  (or  fill  any  vacancy)  at such  Annual  Meeting  of  Shareholders.
Directors  elected as  aforesaid  shall serve  until the next Annual  Meeting of
Shareholders of the Corporation or until their  respective  successors  shall be
elected and qualified.  If, prior to the end of the term of any Director elected
as aforesaid,  a vacancy in the office of such  Director  shall occur during the
continuance  of  a  Dividend  Default  by  reason  of  death,  resignation,   or
disability,  such  vacancy  shall  be  filled  for  the  unexpired  term  by the
appointment  of a new Director for the unexpired  term of such former  Director,
such appointment to be made by the remaining Director elected as aforesaid.

        (c) Certain  Voting Rights.  So long as any Series C Preferred  Stock or
Series C Preferred  Units  exchangeable  into Series C  Preferred  Stock  remain
outstanding,  the Corporation  shall not,  without the  affirmative  vote of the
holders of a majority of the Series C Preferred  Stock  outstanding  at the time
(i)  designate or create,  or increase the  authorized  or issued amount of, any
class or series of shares  ranking  prior to the Series C  Preferred  Stock with
respect to payment of distributions or rights upon  liquidation,  dissolution or
winding-up or reclassify any authorized  shares of the Corporation into any such
shares,  or create,  authorize or issue any obligations or security  convertible
into or  evidencing  the right to purchase  any such shares,  (ii)  designate or
create,  or increase the  authorized or issued  amount of, any Parity  Preferred
Stock or  reclassify  any  authorized  shares of the  Corporation  into any such
shares,  or create,  authorize or issue any obligations or security  convertible
into or evidencing the right to purchase any such shares, but only to the extent
such Parity  Preferred  Stock is issued to an  Affiliate of the  Corporation  on
terms that differ from the terms of such series of Parity Preferred Stock issued
to the  public  or  non-Affiliates  of the  Corporation,  or  (iii)  either  (A)
consolidate,  merge  into or with,  or  convey,  transfer  or lease  its  assets
substantially as an entirety,  to any corporation or other entity, or (B) amend,
alter or repeal the  provisions of the  Corporation's  Charter  (including  this
Certificate of  Determination) or By-laws,  whether by merger,  consolidation or
otherwise,  in each case that would  materially and adversely affect the powers,
special  rights,  preferences,  privileges  or  voting  power  of the  Series  C
Preferred Stock or the holders thereof; provided,  however, that with respect to
the  occurrence  of a  merger,  consolidation  or a sale or  lease of all of the
Corporation's  assets  as an  entirety,  so long as (a) the  Corporation  is the
surviving  entity and the Series C Preferred Stock remains  outstanding with the
terms thereof unchanged, or (b) the resulting, surviving or transferee entity is
a corporation organized under the laws of any state and substitutes the Series C
Preferred Stock for other preferred  stock having  substantially  the same terms
and same  rights as the Series C  Preferred  Stock,  including  with  respect to
distributions,  voting  rights  and  rights  upon  liquidation,  dissolution  or
winding-up, then the occurrence of any such event shall not be deemed materially
and adversely affect such rights,  privileges or voting powers of the holders of
the Series C Preferred  Stock; and provided,  further,  that any increase in the
amount of  authorized  Preferred  Stock or the creation or issuance of any other
class or series of Preferred  Stock,  or any increase in an amount of authorized
shares of each class or series,  in each case  ranking  either (a) junior to the
Series C  Preferred  Stock with  respect to  payment  of  distributions  and the
distribution of assets upon liquidation,  dissolution or winding-up, or (b) on a
parity  with  the  Series  C  Preferred   Stock  with   respect  to  payment  of
distributions  or the  distribution of assets upon  liquidation,  dissolution or
winding-up to the extent such  Preferred  Stock is not issued to an Affiliate of
the  Corporation  on terms that  differ  from the terms of any Parity  Preferred
Stock issued to the public or  non-Affiliates  of the Corporation,  shall not be
deemed to materially and adversely affect such rights,  preferences,  privileges
or voting powers.

        The  affirmative  vote or consent of the  holders of at least 66 2/3% of
the outstanding  shares of this Series and any other series of preferred  shares
ranking  on a parity  with this  Series as to  dividends  and upon  liquidation,
voting as a single class  without  regard to series,  will be required to issue,
authorize  or increase  the  authorized  amount of any class or series of shares
ranking prior to this Series as to dividends or upon  liquidation or to issue or
authorize any obligation or security  convertible  into or evidencing a right to
purchase any such security, but subject to Section 5(c)(ii) hereof, the Articles
of Incorporation  may be amended to increase the number of authorized  preferred
shares  ranking on a parity with or junior to this  Series or to create  another
class of  preferred  shares  ranking on a parity  with or junior to this  Series
without the vote of the holders of outstanding shares of this Series.

        6.  Conversion.  The holders of the Series C  Preferred  Stock shall not
have any rights to convert  such shares into shares of any other class or series
of stock or into any other securities of, or interest in, the Corporation.

        7. No  Sinking  Fund.  No  sinking  fund  shall be  established  for the
retirement or redemption of Series C Preferred Stock.

        8. No Preemptive  Rights.  No holder of the Series C Preferred  Stock of
the Corporation shall, as such holder, have any preemptive rights to purchase or
subscribe  for  additional  shares  of stock  of the  Corporation  or any  other
security of the Corporation which it may issue or sell.



                                                                     Exhibit 3.3

                   CERTIFICATE OF DETERMINATION OF PREFERENCES
                                       OF
                      8 7/8% SERIES X CUMULATIVE REDEEMABLE
                                 PREFERRED STOCK
                                       OF
                             PS BUSINESS PARKS, INC.

            [As filed in the office of the Secretary of State of the
                    State of California on September 7, 1999]

        The undersigned, David Goldberg and Jack E. Corrigan, Vice President and
Secretary,  respectively,  of PS BUSINESS PARKS, INC., a California corporation,
do hereby certify:

        FIRST:  The  Restated  Articles  of  Incorporation  of  the  Corporation
authorize  the  issuance of  50,000,000  shares of stock  designated  "preferred
shares,"  issuable  from time to time in one or more series,  and  authorize the
Board of Directors to fix the number of shares constituting any such series, and
to determine or alter the dividend  rights,  dividend rate,  conversion  rights,
voting  rights,   right  and  terms  of  redemption   (including   sinking  fund
provisions),  the redemption  price or prices and the liquidation  preference of
any wholly  unissued series of such preferred  shares,  and the number of shares
constituting any such series.

        SECOND:  The Board of  Directors of the  Corporation  did duly adopt the
resolutions  attached hereto as Exhibit A and  incorporated  herein by reference
authorizing and providing for the creation of a series of preferred shares to be
known as "8 7/8% Series X Cumulative  Redeemable  Preferred Stock" consisting of
1,200,000 shares, none of the shares of such series having been issued.

        We further  declare under penalty of perjury under the laws of the State
of  California  that the  matters  set  forth in this  certificate  are true and
correct of our own knowledge.

        IN WITNESS WHEREOF,  the undersigned have executed this certificate this
7th day of September, 1999.


                                        /s/ David Goldberg
                                        --------------------------
                                        David Goldberg, Vice President


                                        /s/ Jack E. Corrigan
                                        --------------------------
                                        Jack E. Corrigan, Secretary


<PAGE>

                                    EXHIBIT A

                      RESOLUTION OF THE BOARD OF DIRECTORS
                           OF PS BUSINESS PARKS, INC.

                    ESTABLISHING A SERIES OF 8 7/8% SERIES X
                      CUMULATIVE REDEEMABLE PREFERRED STOCK


        RESOLVED  that  pursuant to the  authority  conferred  upon the Board of
Directors  by Article  III of the  Restated  Articles of  Incorporation  of this
Corporation,  there is hereby  established a series of the authorized  preferred
shares of this  Corporation  having a par value of $.01 per share,  which series
shall be  designated 8 7/8% Series X  Cumulative  Redeemable  Preferred  Stock,"
shall  consist  of  1,200,000  shares  and  shall  have  the  following  rights,
preferences and privileges:

        1. Rank. The 8 7/8% Series X Cumulative  Redeemable Preferred Stock (the
"Series X Preferred  Stock") will, with respect to distributions and rights upon
voluntary  or  involuntary   liquidation,   winding-up  or  dissolution  of  the
Corporation,  or both, rank senior to all classes or series of Common Shares and
to all  classes  or  series  of  equity  securities  of the  Corporation  now or
hereafter authorized,  issued or outstanding,  other than any class or series of
equity securities of the Corporation expressly designated as ranking on a parity
with or senior to the Series X Preferred  Stock as to  distributions  and rights
upon  voluntary or  involuntary  liquidation,  winding-up or  dissolution of the
Corporation. For purposes of this Certificate of Determination, the term "Parity
Preferred  Stock" shall be used to refer to any class or series of capital stock
of the Corporation now or hereafter authorized,  issued or outstanding expressly
designated by the  Corporation to rank on a parity with Series X Preferred Stock
with  respect  to  distributions   and  rights  upon  voluntary  or  involuntary
liquidation,  winding-up  or  dissolution  of  the  Corporation  (including  the
Corporation's  9 1/4%  Cumulative  Preferred  Stock,  Series A, 8-7/8%  Series B
Cumulative Redeemable Preferred Stock, and 8 3/4% Series C Cumulative Redeemable
Preferred Stock). For purposes of the preceding sentence,  "capital stock" means
any equity securities  (including  Common Shares and Preferred  Stock),  shares,
participation or other ownership  interests (however  designated) and any rights
(other  than  debt  securities  convertible  into  or  exchangeable  for  equity
securities) or options to purchase any of the foregoing.

        2. Distributions  Rights.  (a) Payment of Distributions.  Subject to the
rights of holders of Parity Preferred Stock as to the payment of  distributions,
holders of Series X  Preferred  Stock  shall be entitled to receive the Series X
Priority  Return,  when,  as and if  declared by the Board of  Directors  of the
Corporation,  out of funds legally  available for the payment of  distributions.
Such distributions  shall be cumulative,  shall accrue from the original date of
issuance of the Series X Preferred  Stock and will be payable (A)  quarterly  in
arrears,  on March  31,  June 30,  September  30 and  December  31 of each  year
commencing  on the  last  day of the  calendar  quarter  following  the  date of
issuance of such stock and, (B) in the event of a redemption,  on the redemption
date (each a "Series X  Preferred  Stock  Distribution  Payment  Date").  If any
Preferred  Stock  Distribution  Payment  Date is not a Business  Day (as defined
herein),  then payment of the distribution to be made on such date shall be made
on the Business Day  immediately  preceding  such Preferred  Stock  Distribution
Payment  Date in each  case with the same  force  and  effect as if made on such
date.  Distributions on the Series X Preferred Stock will be made to the holders
of record of the Series X Preferred  Stock on the  relevant  record  dates to be
fixed by the Board of Directors of the Corporation,  which record dates shall in
no event be more than 45 days or less than 15 days prior to the relevant  Series
X Preferred Stock Distribution Payment Date (each a "Distribution Record Date").

        For purposes of this Certificate of  Determination,  the following terms
shall have the meanings set forth herein:  (i)  "Liquidation  Preference"  shall
mean, with respect to the Series X Preferred Stock, $25.00 per share of Series X
Preferred Stock, plus the amount of any accumulated and unpaid Series X Priority
Return (as  hereinafter  defined)  with  respect to such  share,  whether or not
declared, minus any distributions in excess of the Series X Priority Return that
has  occurred  with  respect to such  Series X Preferred  Units,  to the date of
payment;  (ii) "Series X Priority  Return" shall mean an amount equal to 8?% per
annum of the  Liquidation  Preference  per  share of Series X  Preferred  Stock,
commencing  on the date of issuance  of such share of Series X Preferred  Stock,
determined  on the basis of a 365-day  year (and  actual  days for any  period),
cumulative  to the  extent  not  distributed  on any  Series X  Preferred  Stock
Distribution  Payment Date; and (iii)  "Business Day" shall mean each day, other
than a Saturday or a Sunday, which is not a day on which banking institutions in
New York,  New York are  authorized or required by law,  regulation or executive
order to close.

      (b) Prohibition on Distributions. No distributions on Series X Preferred
Stock shall be authorized by the Board of Directors of the  Corporation  or paid
or set apart for  payment by the  Corporation  at any such time as the terms and
provisions of any agreement of the Corporation  including any agreement relating
to  indebtedness,  prohibits  such  authorization,  payment or setting apart for
payment or  provides  that such  authorization,  payment  or  setting  apart for
payment would  constitute a breach  thereof or a default  thereunder,  or to the
extent that such  authorization  or payment shall be restricted or prohibited by
law.

        (c)  Distributions  Cumulative.  Distributions on the Series X Preferred
Stock will accrue  whether or not the terms and  provisions  of any agreement of
the  Corporation,  including any agreement  relating to its  indebtedness at any
time  prohibits  the  current  payment  of  distributions,  whether  or not  the
Corporation has earnings,  whether or not there are funds legally  available for
the  payment of such  distributions  and whether or not such  distributions  are
authorized  or  declared.  Accrued  but  unpaid  distributions  on the  Series X
Preferred Stock will accumulate as of the Series X Preferred Stock  Distribution
Payment Date on which they first  become  payable.  Distributions  on account of
arrears for any past distribution  periods may be declared and paid at any time,
without  reference to a regular Series X Preferred  Stock  Distribution  Payment
Date to  holders of record of the Series X  Preferred  Stock on the record  date
fixed by the Board of  Directors  which  date  shall not be more than 45 days or
less  than  15  days  prior  to  the  payment  date.   Accumulated   and  unpaid
distributions will not bear interest.

        (d) Priority as to Distributions.  (i) So long as any Series X Preferred
Stock  is  outstanding,  no  distribution  of cash or  other  property  shall be
authorized,  declared,  paid or set apart for payment on or with  respect to any
class or series of  Common  Shares or any class or series of other  stock of the
Corporation  ranking  junior as to the payment of  distributions  or rights upon
voluntary  or  involuntary   dissolution,   liquidation  or  winding-up  of  the
Corporation to the Series X Preferred  Stock (such Common Shares or other junior
stock,  collectively,  "Junior Stock"),  nor shall any cash or other property be
set aside for or applied to the purchase,  redemption or other  acquisition  for
consideration of any Series X Preferred Stock, any Parity Preferred Stock or any
Junior Stock, unless, in each case, all distributions  accumulated on all Series
X Preferred  Stock and all classes and series of  outstanding  Parity  Preferred
Stock have been paid in full.  The  foregoing  sentence  shall not  prohibit (i)
distributions  payable solely in Junior Stock, and (ii) the conversion of Series
X Preferred  Stock,  Junior  Stock or Parity  Preferred  Stock into stock of the
Corporation ranking junior to the Series X Preferred Stock as to distributions.

        (ii) So long as  distributions  have  not  been  paid in full  (or a sum
sufficient  for such full  payment  is not  irrevocably  deposited  in trust for
payment) upon the Series X Preferred  Stock,  all  distributions  authorized and
declared  on the  Series  X  Preferred  Stock  and  all  classes  or  series  of
outstanding  Parity  Preferred  Stock  with  respect to  distributions  shall be
authorized  and  declared  so that the amount of  distributions  authorized  and
declared per share of Series X Preferred  Stock and such other classes or series
of Parity  Preferred  Stock shall in all cases bear to each other the same ratio
that accrued  distributions  per share on the Series X Preferred  Stock and such
other classes or series of Parity  Preferred  Stock (which shall not include any
accumulation in respect of unpaid  distributions for prior distribution  periods
if such  class or  series  of  Parity  Preferred  Stock  do not have  cumulative
distribution rights) bear to each other.

        (e) No Further Rights.  Holders of Series X Preferred Stock shall not be
entitled  to any  distributions,  whether  payable in cash,  other  property  or
otherwise, in excess of the full cumulative distributions described herein.

        3. Liquidation. (a) Payment of Liquidating Distributions. Subject to the
rights of holders of Parity  Preferred  Stock  with  respect to rights  upon any
voluntary  or  involuntary   liquidation,   dissolution  or  winding-up  of  the
Corporation  and subject to any series of capital  stock  ranking  senior to the
Series  X  Preferred  Stock  with  respect  to  rights  upon  any  voluntary  or
involuntary  liquidation,  dissolution  or  winding-up of the  Corporation,  the
holders of Series X  Preferred  Stock  shall be  entitled  to receive out of the
assets of the  Corporation  legally  available for  distribution or the proceeds
thereof,  after  payment or  provision  for debts and other  liabilities  of the
Corporation, but before any payment or distributions of the assets shall be made
to  holders  of  Common  Shares  or any  other  class or series of shares of the
Corporation  that ranks junior to the Series X Preferred Stock as to rights upon
liquidation,  dissolution or winding-up of the  Corporation,  an amount equal to
the Liquidation  Preference per share of Series X Preferred  Stock. If upon such
voluntary or  involuntary  liquidation,  dissolution  or  winding-up,  there are
insufficient  assets to permit full payment of liquidating  distributions to the
holders of Series X Preferred Stock and any Parity  Preferred Stock as to rights
upon liquidation,  dissolution or winding-up of the Corporation, all payments of
liquidating  distributions  on the  Series X  Preferred  Stock  and such  Parity
Preferred  Stock  shall be made so that the  payments  on the Series X Preferred
Stock and such Parity  Preferred Stock shall in all cases bear to each other the
same ratio that the respective  rights of the Series X Preferred  Stock and such
other  Parity  Preferred  Stock  (which  shall not include any  accumulation  in
respect of unpaid  distributions for prior  distribution  periods if such Parity
Preferred Stock does not have cumulative  distribution rights) upon liquidation,
dissolution or winding-up of the Corporation bear to each other.

        (b)  Notice.  Written  notice  of  any  such  voluntary  or  involuntary
liquidation,  dissolution or winding-up of the Corporation,  stating the payment
date or dates when, and the place or places where, the amounts  distributable in
such circumstances shall be payable, shall be given by (i) fax and (ii) by first
class mail,  postage pre-paid,  not less than 10 and not more than 60 days prior
to the  payment  date  stated  therein,  to each  record  holder of the Series X
Preferred  Stock at the  respective  addresses of such holders as the same shall
appear on the share transfer records of the Corporation.

        (c)  No  Further  Rights.  After  payment  of  the  full  amount  of the
liquidating  distributions  to which they are entitled,  the holders of Series X
Preferred  Stock will have no right or claim to any of the  remaining  assets of
the Corporation.

        (d) Consolidation,  Merger or Certain Other Transactions.  The voluntary
sale,  conveyance,  lease,  exchange  or  transfer  (for cash,  shares of stock,
securities or other  consideration)  of all or substantially all of the property
or  assets  of the  Corporation  to,  or the  consolidation  or  merger or other
business combination of the Corporation with or into, any corporation,  trust or
other  entity (or of any  corporation,  trust or other  entity  with or into the
Corporation)  or a statutory  share exchange shall not be deemed to constitute a
liquidation, dissolution or winding-up of the Corporation.

        4. Redemption.  (a) Right of Optional Redemption. The Series X Preferred
Stock may not be redeemed prior to September 7, 2004. On or after such date, the
Corporation  shall  have the right to redeem the Series X  Preferred  Stock,  in
whole  (but not in part),  at any  time,  upon not less than 30 nor more than 60
days'  written  notice,  at a redemption  price,  payable in cash,  equal to the
Liquidation Preference (the "Series X Redemption Price").

        (b)  Limitation  on  Redemption.  The  redemption  price of the Series X
Preferred  Stock will be  payable  solely to the extent  such  payment  would be
permitted as a distribution under the California Corporations Code.

        (c)  Procedures  for  Redemption.  (i) Notice of redemption  will be (i)
faxed, and (ii) mailed by the Corporation, postage prepaid, not less than 30 nor
more than 60 days prior to the  redemption  date,  addressed  to the  respective
holders  of record  of the  Series X  Preferred  Stock to be  redeemed  at their
respective  addresses as they appear on the transfer records of the Corporation.
No failure to give or defect in such  notice  shall  affect the  validity of the
proceedings  for the redemption of any Series X Preferred Stock except as to the
holder to whom such  notice was  defective  or not  given.  In  addition  to any
information  required by law or by the  applicable  rules of any  exchange  upon
which the Series X Preferred  Stock may be listed or  admitted to trading,  each
such notice shall state:  (i) the redemption  date,  (ii) the redemption  price,
(iii) the number of shares of Series X Preferred Stock to be redeemed,  (iv) the
place or  places  where  such  shares  of  Series X  Preferred  Stock  are to be
surrendered for payment of the redemption  price, (v) that  distributions on the
Series X  Preferred  Stock to be  redeemed  will  cease  to  accumulate  on such
redemption  date  and  (vi)  that  payment  of  the  redemption  price  and  any
accumulated  and  unpaid  distributions  will  be  made  upon  presentation  and
surrender of such Series X Preferred Stock.

        (ii) If the  Corporation  gives a notice of  redemption  in  respect  of
Series X Preferred Stock (which notice will be irrevocable) then, by 12:00 noon,
New York City  time,  on the  redemption  date,  the  Corporation  will  deposit
irrevocably  in trust for the  benefit of the  Series X  Preferred  Stock  being
redeemed funds sufficient to pay the applicable  Series X Redemption  Price, and
will give irrevocable instructions and authority to pay such Series X Redemption
Price to the  holders of the Series X  Preferred  Stock  upon  surrender  of the
certificate evidencing the Series X Preferred Stock by such holders at the place
designated  in the notice of  redemption.  On and after the date of  redemption,
distributions  will cease to accumulate  on the Series X Preferred  Stock called
for redemption,  unless the Corporation  defaults in the payment thereof. If any
date fixed for  redemption  of Series X Preferred  Stock is not a Business  Day,
then payment of the  redemption  price  payable on such date will be made on the
next  succeeding  day that is a Business  Day (and without any interest or other
payment in respect of any such delay) except that, if such Business Day falls in
the next calendar year, such payment will be made on the  immediately  preceding
Business  Day,  in each case with the same  force and  effect as if made on such
date fixed for  redemption.  If payment of the Series X Redemption  Price or any
accumulated or unpaid  distributions  in respect of the Series X Preferred Stock
is improperly withheld or refused and not paid by the Corporation, distributions
on such Series X Preferred  Stock will continue to accumulate  from the original
redemption  date to the date of payment,  in which case the actual  payment date
will be considered the date fixed for redemption for purposes of calculating the
applicable Series X Redemption Price.

        (d) Status of Redeemed Stock. Any Series X Preferred Stock that shall at
any time have been  redeemed  shall  after such  redemption,  have the status of
authorized  but unissued  Preferred  Stock,  without  designation as to class or
series until such shares are once more designated as part of a particular  class
or series by the Board of Directors.

        5. Voting Rights.  (a) General.  Holders of the Series X Preferred Stock
will not have any voting rights, except as set forth below.

      (b) Right to Elect Directors.  If the Corporation shall fail to pay full
cumulative  dividends  on the shares of Series X  Preferred  Stock or any of its
preferred  shares for six quarterly  dividend  payment  periods,  whether or not
consecutive (a "Dividend  Default"),  the holders of all  outstanding  preferred
shares,  voting as a single class without regard to series,  will be entitled to
elect two  Directors  until  full  cumulative  dividends  for all past  dividend
payment  periods on all  preferred  shares have been paid or declared  and funds
therefor  set apart for  payment.  Such right to vote  separately  as a class to
elect Directors shall, when vested,  be subject,  always, to the same provisions
for the vesting of such right to elect  Directors  separately  as a class in the
case of future Dividend Defaults. At any time when such right to elect Directors
separately as a class shall have so vested,  the Corporation may call, and, upon
the  written  request of the holders of record of not less than 20% of the total
number of preferred  shares of the Corporation then  outstanding,  shall call, a
special  meeting of stockholders  for the election of Directors.  In the case of
such a written request,  such special meeting shall be held within 90 days after
the  delivery of such  request  and, in either  case,  at the place and upon the
notice provided by law and in the Bylaws of the  Corporation;  provided that the
Corporation shall not be required to call such a special meeting if such request
is received less than 120 days before the date fixed for the next ensuing Annual
Meeting of  Shareholders  of the  Corporation  and the holders of all classes of
outstanding  preferred  shares  are  afforded  the  opportunity  to  elect  such
Directors  (or  fill  any  vacancy)  at such  Annual  Meeting  of  Shareholders.
Directors  elected as  aforesaid  shall serve  until the next Annual  Meeting of
Shareholders of the Corporation or until their  respective  successors  shall be
elected and qualified.  If, prior to the end of the term of any Director elected
as aforesaid,  a vacancy in the office of such  Director  shall occur during the
continuance  of  a  Dividend  Default  by  reason  of  death,  resignation,   or
disability,  such  vacancy  shall  be  filled  for  the  unexpired  term  by the
appointment  of a new Director for the unexpired  term of such former  Director,
such appointment to be made by the remaining Director elected as aforesaid.

        (c) Certain  Voting Rights.  So long as any Series X Preferred  Stock or
Series X Preferred  Units  exchangeable  into Series X  Preferred  Stock  remain
outstanding,  the Corporation  shall not,  without the  affirmative  vote of the
holders of a majority of the Series X Preferred  Stock  outstanding  at the time
(i)  designate or create,  or increase the  authorized  or issued amount of, any
class or series of shares  ranking  prior to the Series X  Preferred  Stock with
respect to payment of distributions or rights upon  liquidation,  dissolution or
winding-up or reclassify any authorized  shares of the Corporation into any such
shares,  or create,  authorize or issue any obligations or security  convertible
into or  evidencing  the right to purchase  any such shares,  (ii)  designate or
create,  or increase the  authorized or issued  amount of, any Parity  Preferred
Stock or  reclassify  any  authorized  shares of the  Corporation  into any such
shares,  or create,  authorize or issue any obligations or security  convertible
into or evidencing the right to purchase any such shares, but only to the extent
such Parity  Preferred  Stock is issued to an  Affiliate of the  Corporation  on
terms that differ  from the terms of any Parity  Preferred  Stock  issued to the
public or  non-Affiliates  of the Corporation,  or (iii) either (A) consolidate,
merge into or with, or convey,  transfer or lease its assets substantially as an
entirety,  to any corporation or other entity, or (B) amend, alter or repeal the
provisions  of  the  Corporation's   Charter   (including  this  Certificate  of
Determination)  or By-laws,  whether by merger,  consolidation or otherwise,  in
each case that would materially and adversely affect the powers, special rights,
preferences,  privileges or voting power of the Series X Preferred  Stock or the
holders  thereof;  provided,  however,  that with respect to the occurrence of a
merger,  consolidation or a sale or lease of all of the Corporation's  assets as
an entirety,  so long as (a) the  Corporation  is the  surviving  entity and the
Series X Preferred Stock remains  outstanding with the terms thereof  unchanged,
or (b) the resulting,  surviving or transferee entity is a corporation organized
under the laws of any state and  substitutes  the Series X  Preferred  Stock for
other preferred stock having substantially the same terms and same rights as the
Series X Preferred Stock, including with respect to distributions, voting rights
and rights upon liquidation,  dissolution or winding-up,  then the occurrence of
any such event  shall not be deemed to  materially  and  adversely  affect  such
rights,  privileges  or voting  powers of the  holders of the Series X Preferred
Stock;  and  provided,  further,  that any increase in the amount of  authorized
Preferred  Stock or the  creation  or  issuance  of any other class or series of
Preferred Stock, or any increase in an amount of authorized shares of each class
or series,  in each case  ranking  either  (a) junior to the Series X  Preferred
Stock with respect to payment of  distributions  and the  distribution of assets
upon liquidation,  dissolution or winding-up, or (b) on a parity with the Series
X Preferred Stock with respect to payment of  distributions  or the distribution
of assets  upon  liquidation,  dissolution  or  winding-up  to the  extent  such
Preferred  Stock is not issued to an Affiliate of the  Corporation on terms that
differ  from the terms of any  Parity  Preferred  Stock  issued to the public or
non-Affiliates  of the  Corporation,  shall  not be  deemed  to  materially  and
adversely affect such rights, preferences, privileges or voting powers.

        The  affirmative  vote or consent of the  holders of at least 66 2/3% of
the outstanding  shares of this Series and any other series of preferred  shares
ranking  on a parity  with this  Series as to  dividends  and upon  liquidation,
voting as a single class  without  regard to series,  will be required to issue,
authorize  or increase  the  authorized  amount of any class or series of shares
ranking prior to this Series as to dividends or upon  liquidation or to issue or
authorize any obligation or security  convertible  into or evidencing a right to
purchase any such security, but subject to Section 5(c)(ii) hereof, the Articles
of Incorporation  may be amended to increase the number of authorized  preferred
shares  ranking on a parity with or junior to this  Series or to create  another
class of  preferred  shares  ranking on a parity  with or junior to this  Series
without the vote of the holders of outstanding shares of this Series.

        6.  Conversion.  The holders of the Series X  Preferred  Stock shall not
have any rights to convert  such shares into shares of any other class or series
of stock or into any other securities of, or interest in, the Corporation.

        7. No  Sinking  Fund.  No  sinking  fund  shall be  established  for the
retirement or redemption of Series X Preferred Stock.

        8. No Preemptive  Rights.  No holder of the Series X Preferred  Stock of
the Corporation shall, as such holder, have any preemptive rights to purchase or
subscribe  for  additional  shares  of stock  of the  Corporation  or any  other
security of the Corporation which it may issue or sell.




                                                                     Exhibit 3.4

                                  AMENDMENT TO
                   CERTIFICATE OF DETERMINATION OF PREFERENCES
                                       OF
                      8-7/8% SERIES X CUMULATIVE REDEEMABLE
                                 PREFERRED STOCK
                                       OF
                             PS BUSINESS PARKS, INC.

            [As filed in the office of the Secretary of State of the
                   State of California on September 24, 1999]


        The undersigned, David Goldberg and Jack E. Corrigan, Vice President and
Secretary,  respectively,  of PS BUSINESS PARKS, INC., a California  corporation
(the "Corporation"), do hereby certify:

        FIRST:  Pursuant to and in accordance with the provisions of Section 401
of the California  Corporations  Code and the Restated Articles of Incorporation
of the  Corporation,  the Board of Directors of the Corporation has duly adopted
the resolution attached hereto as Exhibit A and incorporated herein by reference
authorizing and increasing the authorized  number of shares of the Corporation's
8-7/8%  Series  X  Cumulative  Redeemable  Preferred  Stock  from  1,200,000  to
1,600,000, for a net increase of 400,000 shares.

        SECOND:  None  of  the  shares  of the  Corporation's  8-7/8%  Series  X
Cumulative Redeemable Preferred Stock has been issued.

        We further  declare under penalty of perjury under the laws of the State
of California  that the matters set forth in the foregoing  certificate are true
and correct of our own knowledge.

        IN WITNESS WHEREOF,  the undersigned have executed this certificate this
23rd day of September, 1999.


                                        /s/ DAVID GOLDBERG
                                        --------------------------
                                        David Goldberg, Vice President


                                        /s/ JACK E. CORRIGAN
                                        --------------------------
                                        Jack E. Corrigan, Secretary


<PAGE>

                                    EXHIBIT A

                      RESOLUTION OF THE BOARD OF DIRECTORS
                           OF PS BUSINESS PARKS, INC.

                       INCREASING THE AUTHORIZED NUMBER OF
                            SHARES OF 8-7/8% SERIES X
                      CUMULATIVE REDEEMABLE PREFERRED STOCK


        RESOLVED:  That  pursuant to the authority  conferred  upon the Board of
Directors  by Article  III of the  Restated  Articles of  Incorporation  of this
Corporation  and the  resolutions  creating the  corporation's  8-7/8%  Series X
Cumulative  Redeemable  Preferred Stock,  the number of shares  constituting the
corporation's 8-7/8% Series X Cumulative Redeemable Preferred Stock is increased
from 1,200,000 shares to 1,600,000 shares.



===============================================================================

                                                                   Exhibit 10.16



                  FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT

                           dated as of August 19, 1999

                                      among

                            PS BUSINESS PARKS, L.P.,


                           THE LENDERS LISTED HEREIN,


                                       and

                     WELLS FARGO BANK, NATIONAL ASSOCIATION,
                                    as Agent





===============================================================================


<PAGE>

                                TABLE OF CONTENTS

                                                                           Page


ARTICLE I.  THE AMENDMENTS....................................................1

         SECTION 1.1.  Definitions............................................1

         SECTION 1.2.  Extension Fee..........................................3

         SECTION 1.3.  Extension..............................................3

         SECTION 1.4.  Financial Information..................................4

         SECTION 1.5.  Intentially Deleted....................................4

         SECTION 1.6.  Minimum Tangible Net Worth.............................4

         SECTION 1.7.  Fixed Charge Coverage..................................4

         SECTION 1.8.  Financial Statements and Other Reports.................4

         SECTION 1.9.  Environmental Matters..................................5


ARTICLE II.  CONDITIONS TO EFFECTIVENESS OF THIS AMENDMENT....................6


ARTICLE III.  REPRESENTATIONS OF BORROWER.....................................7


ARTICLE IV.  MISCELLANEOUS....................................................7

         SECTION 4.1.  Capitalized Terms......................................7

         SECTION 4.2.  Ratification...........................................7

         SECTION 4.3.  Counterparts...........................................7

         SECTION 4.4.  Governing Law..........................................7

                                       i
<PAGE>

                  FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT

          THIS FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT (this  "Amendment")
dated as of August 19, 1999 among PS BUSINESS PARKS,  L.P., a California limited
partnership (the  "Borrower"),  the lenders listed on the signature pages hereof
("Lenders"),   and  WELLS  FARGO  BANK,  NATIONAL  ASSOCIATION,   as  agent  and
representative for the Lenders (in such capacity, the "Agent").

          WHEREAS,  Borrower,  the Agent and the lenders listed on the signature
pages thereof entered into that certain  Revolving Credit  Agreement  ("Original
Agreement") dated as of August 6, 1998;

          WHEREAS,  Borrower,  the  Lenders  and the Agent  wish to  extend  the
Maturity  Date to  August  6,  2002 and make  certain  other  amendments  to the
Original Agreement. The Original Agreement, as modified by this Amendment may be
referred to herein as the "Credit Agreement";

          NOW,  THEREFORE,  in  consideration  of the premises and of the mutual
covenants and agreements  hereinafter set forth,  the Borrower,  the Lenders and
the Agent agree as follows:

                                   ARTICLE I.

                                 THE AMENDMENTS

          SECTION 1.1.  Definitions.  The following  terms shall be added to, or
shall be substituted in lieu of the  corresponding  terms in, Section 1.1 of the
Original Agreement:

          "Applicable  Margin" means,  with respect to each Loan, the respective
percentages  per annum  determined,  at any time,  based on the range into which
Borrower's  Credit  Rating then falls,  in  accordance  with the table set forth
below. Any change in Borrower's  Credit Rating causing it to move to a different
range on the table shall effect an  immediate  change in the  Applicable  Margin
(including  existing  Loans).  Promptly  after  learning  of  a  change  in  the
Borrower's Credit Rating,  Agent shall give notice of such change to the Lenders
and include in such notice the new  Applicable  Margin and the effective date of
such change.  In the event that more than one (1)  different  Credit  Rating has
been assigned, the lower of the Credit Ratings will prevail.

                                       1
<PAGE>

                                     GRID A:

<TABLE>
<CAPTION>
                                                            Applicable
                                                            Margin for               Applicable
                        Range of                            Base Rate                Margin for
                        Borrower's                          Loans                    LIBOR Loans
                        Credit Rating                       (% per annum)            (% per annum)
                        -------------                       -------------            -------------
<S>                     <C>                                 <C>                      <C>

Level I                 A-/A3
                        or better                                   0.0                    0.75

Level II                BBB+/Baa1                                   0.0                    0.80

Level III               BBB/Baa2                                    0.0                    0.95

Level IV                BBB-/Baa3                                   0.0                    1.00

Level V                 Unrated or Below Investment Grade           0.0              See Grid B
</TABLE>

                                     GRID B:
<TABLE>
<CAPTION>
                                                            Applicable
                                                            Margin for               Applicable
                                                            Base Rate                Margin for
                                                            Loans                    LIBOR Loans
                        Leverage                            (% per annum)            (% per annum)
                        -------------                       -------------            -------------
<S>                     <C>                                 <C>                      <C>

Level I                 Less than or Equal to 25%                   0.0                    1.05

Level II                > 25% Less than or Equal to 35%             0.0                    1.10

Level III               > 35% Less than or Equal to 45%             0.0                    1.20

Level IV                > 45%                                       0.0                    1.35
</TABLE>

          "Equity  Offering  Net  Proceeds"  means,  cumulatively,  the Net cash
proceeds  received  and the value of assets  acquired  (net of Debt  incurred or
assumed in  connection  therewith)  through the issuance of Capital Stock of any
Borrower Party after the Amendment Date,  excluding any amounts  attributable to
mandatorily  redeemable  preferred stock (other than preferred stock  redeemable
solely  with  common  stock).  "Net"  means  net  of  underwriters'   discounts,
commission  and other  reasonable  out-of-pocket  expenses  actually paid to any
Person (other than any Borrower Party or any Affiliate thereof).

          "Fee Letter"  means that certain  letter dated August 19, 1999 between
the Borrower and the Agent.

          "Fixed   Charges"  means,   for  any  Fiscal   Quarter,   and  without
duplication,  Interest Expense for such Fiscal Quarter, plus scheduled principal
amortization  payments  (other than  balloon  payments)  on Debt of the Borrower
Parties and the  Consolidated  Entities  during such  Fiscal  Quarter,  plus the
Capital  Expenditure  Reserve,  plus all dividends and other  distributions paid
during  such  Fiscal  Quarter  to  holders  of  preferred   stock  or  preferred
partnership units of the Borrower Parties and the Consolidated Entities.

                                       2
<PAGE>

          "Liquidated Cost" shall have the meaning set forth in Section 5.12.

          "Maturity Date" means at any time, the  then-applicable  maturity date
specified hereunder. The initial Maturity Date shall be August 6, 2002, although
such date may be extended by the Lenders as provided in Section 2.5.2 hereof.

          "Revolving Loan Note" means a Note made by the Borrower payable to the
order  of a  particular  Lender,  in  the  amount  of  such  Lender's  Revolving
Commitment,  which note is  substantially in the form of Exhibit A-1, as amended
(including any amendments and restatements thereof) from time to time.

          SECTION 1.2. Extension Fee. Section 2.4.2 of the Original Agreement is
hereby deleted in its entirety.

          SECTION 1.3.  Extension.  Section  2.5.2 of the Original  Agreement is
hereby  deleted in its entirety and the following  shall be  substituted in lieu
thereof:

          2.5.2.  Extension.  Borrowers  may request  extensions of the Maturity
Date by making such  request to Agent  ("Extension  Notice") in writing at least
ninety (90) days prior to each  anniversary of the Closing Date (commencing with
the  anniversary  falling on August 6, 2000).  The Agent and the Lenders have no
obligation  to extend  the  Maturity  Date and the  Maturity  Date  shall not be
extended  unless (i) the Borrower is in full  compliance  with all of the terms,
conditions  and  covenants  of this  Agreement at the time of request and on the
applicable  anniversary  Date, (ii) all of the Lenders and the Agent have agreed
to do so in  writing,  (iii)  Borrower  shall,  on or  prior  to the  applicable
anniversary,  have executed and delivered to the Agent an extension agreement in
the  form  provided  by  Agent,  and  (iv)  Borrower  shall,  on or prior to the
applicable  anniversary,  provided all Lenders  shall have approved the request,
have  remitted to the Agent any  extension  fee,  and have  satisfied  any other
conditions to extension, agreed to between Borrower and the Agent. If Borrower's
request for extension is approved and the other  foregoing  conditions  are met,
then (i) the  extension  of the  Maturity  Date shall be for a period of one (1)
year  and  (ii)  such  extension   shall  be  effective  as  of  the  applicable
anniversary.  The Agent and the Lenders shall have a period of  forty-five  (45)
days from  receipt  of  written  notice of  Borrowers'  intention  to extend the
Maturity Date to approve such extension,  in their sole and absolute discretion.
If Borrower has not received written notice of the Lenders'  intention to extend
the Maturity  Date within such  forty-five  (45) day period,  then the extension
request shall be deemed to be not approved. If an extension is granted, Borrower
may request  subsequent one (1) year extensions subject to the same criteria and
procedures  established in this Section 2.5.2. As an example, in order to extend
the initial Maturity Date,  Borrower must notify Agent at least ninety (90) days
prior to August 6, 2000.  If approved,  the Maturity Date would then be extended
from  August 6, 2002 to August 6,  2003.  In the event that  Borrower's  initial
request for extension is not granted,  any  subsequent  request for extension is
not granted,  or Borrower does not request an extension pursuant to this Section
2.5.2, then,  commencing on the Maturity Date,  Borrower shall no longer be able
to obtain Loans  hereunder  and all  outstanding  Loans shall become all due and
payable.

                                       3
<PAGE>

          SECTION  1.4.  Financial  Information.  Section  4.5.1 of the Original
Agreement  is hereby  amended by  deleting  the dates  "December  31,  1996" and
"December  31, 1997" and  substituting  in lieu thereof the dates  "December 31,
1997" and  "December  31,  1998"  respectively.  Section  4.5.2 of the  Original
Agreement is hereby amended by deleting the words  "September 30, 1997 and March
31, 1998" and substituting in lieu thereof the words "June 30, 1999".

          SECTION 1.5. [Intentially Deleted].

          SECTION 1.6. Minimum Tangible Net Worth. Section 6.4.3 of the Original
Agreement  is  hereby  deleted  in its  entirety  and  the  following  shall  be
substituted in lieu thereof:

          6.4.3. Minimum Tangible Net Worth.  Tangible Net Worth of Borrower and
Guarantor shall not be less than, at any time: (i) $675,000,000 plus (ii) ninety
percent (90%) of Equity Offering Net Proceeds.

          SECTION 1.7.  Fixed  Charge  Coverage.  Section  6.4.6 of the Original
Agreement  is  hereby  deleted  in its  entirety  and  the  following  shall  be
substituted in lieu thereof:

          6.4.6.  Fixed  Charge  Coverage.  At any time,  the ratio of EBITDA to
Fixed Charges for the most recently  completed  Fiscal Quarter shall not be less
than 1.75:1.0.

          SECTION 1.8.  Financial  Statements and Other Reports.  Sections 5.1.2
through 5.1.5 of the Original Agreement are hereby deleted in their entirety and
the following shall be substituted in lieu thereof:

          5.1.2.  As soon as practicable and in any event within fifty (50) days
after the end of each of the first three (3) Fiscal  Quarters during each Fiscal
Year a consolidated  balance sheet of the Borrower Parties as of the end of such
quarter and the related consolidated statements of income,  stockholders' equity
and cash flow for such  quarter  and the portion of the Fiscal Year ended at the
end of such  quarter,  setting  forth  in  each  case in  comparative  form  the
consolidated figures for the corresponding periods of the prior Fiscal Year, all
in reasonable detail and certified by the Guarantor's chief financial officer as
fairly presenting the consolidated  financial  condition of the Borrower Parties
as of the dates  indicated and the  consolidated  results of operations and cash
flows for the periods indicated, subject to normal year-end adjustments and made
in accordance with GAAP.

          5.1.3.  Within  ninety-five  (95) days  after  the end of each  Fiscal
Quarter  ending  December  31 and  within  fifty (50) days after the end of each
other Fiscal  Quarter,  a certificate  of the senior  vice-president,  corporate
finance,  chief  financial  officer,  controller  or treasurer of the  Guarantor
substantially  in the form of Exhibit F (a "Compliance  Certificate"),  (a) duly

                                       4
<PAGE>
completed setting forth the calculations required to establish  Availability and
compliance  with Section 6.4 on the date of such  financial  statements  and (b)
stating that, to the best  knowledge of such officer,  after making such inquiry
and  other   investigation   as  such  officer   deems   reasonable   under  the
circumstances, no Default exists or, if a Default does exist, the nature thereof
and the action that the Borrower proposes to take with respect thereto;

          5.1.4.  Within  ninety-five  (95) days  after  the end of each  Fiscal
Quarter  ending  December  31 and  within  fifty (50) days after the end of each
other Fiscal Quarter, a report showing Available Financing as of the end of such
Fiscal Quarter.

          5.1.5.   An   Unencumbered   Pool  report  which   includes  for  each
Unencumbered  Asset,  the Property NOI for such Fiscal  Quarter with  reasonable
detail as to all Property Expenses,  Capital Expenditures  incurred, and average
Occupancy  Rate during the Fiscal  Quarter.  This portion of the report shall be
submitted to the Agent within ninety-five (95) days after the end of each Fiscal
Quarter  ending  December  31 and  within  fifty (50) days after the end of each
other Fiscal Quarter.

          SECTION 1.9.  Environmental  Matters.  Section  5.12.1 of the Original
Agreement  is  hereby  deleted  in its  entirety  and  the  following  shall  be
substituted in lieu thereof:

          5.12.1.  Promptly upon discovery of any violation or alleged violation
of Environmental  Requirements with respect to any Real Property of any Borrower
Party,  the  Borrower  shall  attempt  in good faith as soon as  practicable  to
determine the cost to remediate such violation of Environmental Requirements and
the  Borrower  shall  thereupon  notify the Agent in  writing of the  Borrower's
reasonable,  good faith  estimate of the cost to  remediate  such  violation  or
alleged  violation.  Such  good  faith  estimate  of  the  cost  of  remediation
(exclusive of costs and expenses of investigation), as revised from time to time
pursuant hereto,  shall be deemed to be the "Liquidated  Cost" of such violation
or  alleged  violation  of  Environmental   Requirements.   From  time  to  time
thereafter,  not less than  ninety-five  (95) days after the end of each  Fiscal
Quarter  ending  December  31 and not less than fifty (50) days after the end of
each other Fiscal  Quarter,  the Borrower shall review and update all Liquidated
Costs  and  shall  deliver a written  report  to the  Agent  setting  forth,  in
reasonable  detail,  each  Liquidated  Cost in  excess  of One  Million  Dollars
($1,000,000),  the basis for the  determination  of the Liquidated Cost, and the
Borrower's  plans  with  respect  to such  violation  or  alleged  violation  of
Environmental Requirements.

                                  ARTICLE II.

                  CONDITIONS TO EFFECTIVENESS OF THIS AMENDMENT

          The  closing  hereunder  shall  occur  on the  date  when  each of the
following  conditions is satisfied (or waived by the Agent and the Lenders) (the
"Amendment Date"), each document to be dated the Amendment Date unless otherwise
indicated:

                                       5
<PAGE>

          (a) the Borrower  shall have  executed and delivered to the Agent duly
executed  original  Notes for the account of each Lender dated as of the Closing
Date complying with the provisions of Section 2.3 of the Credit Agreement;

          (b) the  Borrower,  the  Agent  and  each of the  Lenders  shall  have
executed and delivered to the Borrower and the Agent a duly executed original of
this Amendment;

          (c)  Guarantor  shall have  executed and delivered to the Agent a duly
executed consent to this Amendment reaffirming Guarantor's obligations under the
Guaranty;

          (d) the  Agent  shall  have  received  all  documents  the  Agent  may
reasonably request relating to the existence of the Borrower and Guarantor,  the
authority for and the validity of this  Amendment and the other Loan  Documents,
and any other matters relevant hereto, all in form and substance satisfactory to
the Agent. Such documentation shall include,  without limitation,  the agreement
of limited  partnership of the Borrower,  as well as the  certificate of limited
partnership of the Borrower,  both as amended,  modified or  supplemented to the
Amendment Date,  certified to be true,  correct and complete by a senior officer
of the Borrower as of a date not more than ten (10) days prior to the  Amendment
Date,  as well as the  articles of  incorporation  and bylaws of  Guarantor,  as
amended,  modified or supplemented to the Amendment Date,  certified to be true,
correct and complete by a senior officer of Guarantor as of a date not more than
ten (10) days prior to the Amendment Date;

          (e) the Borrower and Guarantor  shall have taken all actions  required
to authorize  the  execution  and delivery of this  Amendment and the other Loan
Documents and the performance thereof by the Borrower and Guarantor, as the case
may be;

          (f) the Agent  shall  have  received,  for its and any other  Lender's
account and the account of Gibson, Dunn & Crutcher LLP, all fees due and payable
pursuant to the Lender Fee Letter on or before the Amendment Date;

          (g) the Borrower shall have executed and delivered to the Agent a duly
executed original of the Fee Letter;

          (h) no Default or Event of Default shall have occurred; and

          (i) each of the Notes  executed  by Borrower  in  connection  with the
Original  Agreement  shall have been  surrendered by the relevant  Lender to the
Agent for  cancellation  and  return  to the  Borrower  simultaneously  with the
Closing  (it  being  acknowledged  and  agreed  by the  Lenders  that the  Notes
originally  executed by Borrower as of the Closing Date in  connection  with the
Original Agreement (which are being replaced as of the Amendment Date by amended
and  restated  notes) shall be deemed  canceled,  paid in full and of no further
force and effect as of the Amendment Date.

                                       6
<PAGE>

                                  ARTICLE III.

                           REPRESENTATIONS OF BORROWER

          The Borrower  hereby  represents and warrants to the Agent and each of
the Lenders the following:

          (a)  All  of  the  representations  and  warranties  contained  in the
Original Agreement are true and correct on and as of the date hereof and will be
true  and  correct  after  giving  effect  to  this  Amendment;   the  foregoing
representation  and  warranty  is not  intended to modify  Section  7.1.4 of the
Credit Agreement.

          (b) No event which  constitutes a Default or an Event of Default under
the Original  Agreement,  as amended hereby, has occurred and is continuing,  or
would result from the execution and delivery of this Amendment.

          (c) The  Borrower  has the power and  authority to execute and deliver
this Amendment and to perform its obligations under the Original  Agreement,  as
amended  hereby,  and  under  the  Notes;  and all such  action  has  been  duly
authorized  by all  necessary  proceeding  on its  part.  Each  of the  Original
Agreement,  this Amendment and the Notes has been duly and validly  executed and
delivered  by the  Borrower  and  constitutes  the  valid  and  legally  binding
obligation of the Borrower  enforceable in accordance with its terms,  except as
limited by  moratorium,  bankruptcy,  reorganization,  insolvency  or other laws
affecting  creditor's rights generally or by the exercise of judicial discretion
in accordance with general principles of equity.

                                   ARTICLE IV.

                                  MISCELLANEOUS

          SECTION 4.1 Capitalized  Terms The capitalized terms used herein which
are defined in the Original  Agreement  and not otherwise  defined  herein shall
have the meanings specified therein.

          SECTION 4.2 Ratification The Original Agreement, as hereby amended, is
in all respects ratified and confirmed,  and all other rights and powers created
thereby or thereunder shall be and remain in full force and effect.

          SECTION 4.3  Counterparts  This  Amendment  may be executed in several
counterparts,  and each  counterpart,  when so  executed  and  delivered,  shall
constitute  an original  instrument,  and all such separate  counterparts  shall
constitute one and the same instrument.

          SECTION 4.4 Governing Law THIS  AMENDMENT AND THE OTHER LOAN DOCUMENTS
AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES  HEREUNDER AND THEREUNDER SHALL BE
CONSTRUED  IN  ACCORDANCE  WITH  AND BE  GOVERNED  BY THE  LAWS OF THE  STATE OF
CALIFORNIA  EXCEPT TO THE EXTENT PREEMPTED BY FEDERAL LAW (WITHOUT GIVING EFFECT
TO THE PRINCIPLES THEREOF RELATING TO CONFLICTS OF LAW).

                                      7
<PAGE>

          IN WITNESS  WHEREOF,  the parties hereto have caused this Amendment to
be duly executed by their respective  authorized officers as of the day and year
first above written.

                                        Borrower:

                                        PS BUSINESS PARKS, L.P.,
                                        a California limited partnership

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


                                        By: /s/ Ronald L. Havner
                                            ----------------------
                                            Name: Ronald L. Havner
                                            Title: President

                                        Address: PS BUSINESS PARKS, L.P.
                                        701 Western Avenue
                                        Glendale, California 91201
                                        Attn: Chief Financial Officer
                                        Telephone: (818) 244-8080
                                        Telecopier:(818) 244-9267

<PAGE>
                                        Agent:

                                        Wells Fargo Bank, National Association


                                        By: /s/ Sharon Fisher
                                            ----------------------
                                            Name: Sharon Fisher
                                            Title: Vice President

                                        Address: Wells  Fargo  Bank,
                                                 National Association
                                        2030 Main Street, 8th Floor
                                        Irvine, California 92614
                                        Attention: Office Manager
                                        Telephone: (949) 251-4300
                                        Telecopier: (949) 851-9728

<PAGE>
                                        Lender:

                                        Wells Fargo Bank, National Association


                                        By: /s/ Sharon Fisher
                                            ----------------------
                                            Name: Sharon Fisher
                                            Title: Vice President

                                        Address: Wells Fargo Bank,
                                                 National Association
                                        2030 Main Street, 8th Floor
                                        Irvine, California 92614
                                        Attention: Office Manager
                                        Telephone: (949) 251-4300
                                        Telecopier: (949) 851-9728

                                        LIBOR LENDING OFFICE:
                                        Wells Fargo Bank, National Association
                                        2120 East Park Place, Suite 100
                                        El Segundo, California 90245
                                        Attention: Anne Colvin
                                        Telephone: (310) 335-9458
                                        Telecopier: (310) 615-1014


<PAGE>

                              CONSENT OF GUARANTOR

The   undersigned,   PS  BUSINESS   PARKS,   INC.,  a   California   corporation
("Guarantor"), (i) hereby consents to the foregoing First Amendment to Revolving
Credit  Agreement dated as of August 19, 1999 (the "First  Amendment")  among PS
BUSINESS PARKS, L.P., a California limited partnership ("Borrower"), the lenders
listed therein (the "Lenders") and WELLS FARGO BANK,  NATIONAL  ASSOCIATION,  as
Agent (in such capacity, the "Agent"), and (ii) hereby reaffirms its obligations
under that certain General  Continuing  Repayment Guaranty dated as of August 6,
1998 made by Guarantor in favor of the Lenders and the Agent  pursuant to which,
among  other  things,  Guarantor  guarantees  the  payment  and  performance  of
Borrower's  obligations  under the Revolving Credit Agreement dated as of August
6, 1998 among  Borrower,  the  Lenders  and the  Agent,  as amended by the First
Amendment.

                                        PS BUSINESS PARKS, INC.,
                                        a California corporation


                                        By: /s/ Ronald L. Havner
                                            ----------------------
                                            Name: Ronald L. Havner
                                            Title: President



                                                                   Exhibit 10.23

                            PS BUSINESS PARKS, L.P.
                        AMENDMENT TO AGREEMENT OF LIMITED
                             PARTNERSHIP RELATING TO
                      8 3/4% SERIES C CUMULATIVE REDEEMABLE
                                 PREFERRED UNITS

        This  Amendment to the Agreement of Limited  Partnership  of PS Business
Parks, L.P., a California limited partnership (the  "Partnership"),  dated as of
the 3rd day of  September,  1999  (this  "Amendment")  amends the  Agreement  of
Limited Partnership of the Partnership, dated as of March 17, 1998, by and among
PS Business Parks, Inc. (the "General Partner") and each of the limited partners
executing a signature  page  thereto,  as amended by that  certain  Amendment to
Agreement  of  Limited  Partnership  Relating  to 8  3/4%  Series  B  Cumulative
Redeemable  Preferred  Units,  dated as of April 23,  1999 and an  Amendment  to
Agreement  of  Limited  Partnership  Relating  to 9  1/4%  Series  A  Cumulative
Redeemable  Preferred  Units,  dated as of April 30,  1999 and as may be further
amended by an  Amendment  Relating to Series X Cumulative  Redeemable  Preferred
Units which is expected to be generally in a form similar to the Amendment dated
as of  April  23,  1999 and may be  entered  into at or  about  the time  hereof
(collectively,  the "Partnership Agreement").  Capitalized terms used herein and
not  otherwise  defined  shall have the  meanings  ascribed to such terms in the
Partnership  Agreement.  Section  references  are (unless  otherwise  specified)
references to sections in this Amendment.

        WHEREAS,  pursuant to Section 4.2(a) of the Partnership  Agreement,  the
General Partner desires to cause the Partnership to issue  additional Units of a
new  class  and  series,  with  the  designations,   preferences  and  relative,
participating,  optional or other  special  rights,  powers and duties set forth
herein;

        WHEREAS,  Operating  Partnership  and  Company  intend to issue  certain
Series X Preferred Units and to authorize issuance of the accompanying  Series X
Preferred  Shares,  respectively,  either soon before or after the date  hereof,
which  Series X  Preferred  Units and  Series X  Preferred  Shares,  when and if
issued,  shall rank in parity with or junior to the Series C Preferred Units and
Series C  Preferred  Shares  with  respect  to  distributions  and  rights  upon
voluntary  or   involuntary   liquidation   winding-up  or  dissolution  of  the
Partnership;

        WHEREAS,  pursuant to Section 4.2(a) of the Partnership  Agreement,  the
General  Partner,  without the consent of the  Limited  Partners,  may amend the
Partnership  Agreement by executing a written instrument setting forth the terms
of such amendment; and

        WHEREAS,  the General  Partner desires by this Amendment to so amend the
Partnership  Agreement  as of the date first set forth  above to provide for the
designation and issuance of such new class and series of Units.

        NOW,  THEREFORE,   the  Partnership   Agreement  is  hereby  amended  by
establishing  and fixing the rights,  limitations and preferences of a new class
and series of Units as follows:

        Section 1.  Definitions.  Capitalized terms not otherwise defined herein
shall have their  respective  meanings set forth in the  Partnership  Agreement.
Capitalized  terms that are used in this  Amendment  shall have the meanings set
forth below:

        (a)  "Liquidation  Preference"  means,  with  respect  to the  Series  C
Preferred  Units,  $25.00 per Series C  Preferred  Unit,  plus the amount of any
accumulated and unpaid Priority Return with respect to such unit, whether or not
declared,  minus any  distributions  in excess of the  Priority  Return that has
accrued with respect to such Series C Preferred Units to the date of payment.

        (b) "Parity  Preferred  Units" means any class or series of  Partnership
Interests of the Partnership now or hereafter authorized,  issued or outstanding
and expressly  designated by the Partnership to rank on a parity with the Series
C Preferred Units (as  hereinafter  defined) with respect to  distributions  and
rights upon  voluntary or involuntary  liquidation  winding-up or dissolution of
the Partnership,  including the 9 1/4% Series A Cumulative  Redeemable Preferred
Units  and the 8 3/4%  Series  B  Cumulative  Redeemable  Preferred  Units.  For
purposes of this  Amendment,  the Series X Preferred  Units shall be  considered
Parity Preferred Units and shall not be considered  "Junior Units" as defined in
Section 3(d)(i) below,  notwithstanding the differing allocation  provisions set
forth in Section 4 herein.

        (c)  "Priority  Return" means an amount equal to 8 3/4% per annum of the
Liquidation  Preference per Series C Preferred  Unit,  commencing on the date of
issuance of such Series C Preferred  Unit,  determined on the basis of a 360-day
year of twelve 30-day  months,  and for any period shorter than a full quarterly
period for which  distributions  are computed,  the amount of the  distributions
payable will be based on the ratio of the actual  number of days elapsed in such
period to ninety (90) days,  cumulative  to the extent not  distributed  for any
given distribution period pursuant to Section 3, hereof,  commencing on the date
of the issuance of such Series C Preferred Unit.

        (d) "PTP" means a "publicly  traded  partnership"  within the meaning of
Section 7704 of the Code.

        Section 2.  Designation  and Number.  Pursuant to Section  4.2(a) of the
Partnership  Agreement,  a  series  of  Partnership  Units  in  the  Partnership
designated as the "8 3/4% Series C Cumulative  Redeemable  Preferred Units" (the
"Series C  Preferred  Units")  is  hereby  established.  The  number of Series C
Preferred  Units shall be  3,200,000.  The  Holders of Series C Preferred  Units
shall  not  have  any  Percentage  Interest  (as  such  term is  defined  in the
Partnership Agreement) in the Partnership.

        Section 3. Distributions.  (a) Payment of Distributions.  Subject to the
rights of holders of Parity  Preferred Units as to the payment of  distributions
pursuant  to  Section  5.1 of the  Partnership  Agreement,  holders  of Series C
Preferred  Units shall be entitled to receive,  when,  as and if declared by the
Partnership  acting  through the General  Partner,  the  Priority  Return.  Such
Priority  Return shall be  cumulative,  shall  accrue from the original  date of
issuance of the Series C Preferred Units and, notwithstanding Section 5.1 of the
Partnership Agreement, will be payable (i) quarterly in arrears on March 1, June
1,  September 1 and December 1 of each year  commencing on December 1, 1999, and
(ii) in the event of (A) a  redemption  of Series C Preferred  Units,  or (B) an
exchange of Series C  Preferred  Units into  Series C  Preferred  Stock,  on the
redemption date or the exchange date, as applicable  (each a "Series C Preferred
Unit Distribution Payment Date"). The amount of the distribution payable for any
period will be computed on the basis of a 360-day year of twelve  30-day  months
and for any period shorter than a full quarterly period for which  distributions
are computed,  the amount of the distribution  payable will be computed based on
the ratio of the actual  number of days  elapsed in such  period to ninety  (90)
days.  If any  date  on  which  distributions  are to be made  on the  Series  C
Preferred Units is not a Business Day (as defined  herein),  then payment of the
distribution  to be  made  on  such  date  will  be  made  on the  Business  Day
immediately  preceding  such date with the same  force and  effect as if made on
such date.  Distributions  on the Series C  Preferred  Units will be made to the
holders of record of the Series C Preferred  Units on the relevant  record dates
to be fixed by the Partnership acting through the General Partner,  which record
dates shall in no event exceed  fifteen (15) Business Days prior to the relevant
Series C Preferred Unit Distribution  Payment Date (the "Series C Preferred Unit
Partnership Record Date").

        (b) Prohibition on Distribution.  No distributions on Series C Preferred
Units  shall be  authorized  by the  General  Partner  or paid or set  apart for
payment by the  Partnership  at any such time as the terms and provisions of any
agreement of the  Partnership  or the General  Partner,  including any agreement
relating to their indebtedness, prohibits such authorization, payment or setting
apart for payment or provides that such authorization,  payment or setting apart
for payment would constitute a breach thereof or a default thereunder, or to the
extent that such  authorization  or payment shall be restricted or prohibited by
law.

        (c)  Distributions  Cumulative.  Distributions on the Series C Preferred
Units  will  accrue,  whether  or not  declared,  whether  or not the  terms and
provisions of any agreement of the Partnership, including any agreement relating
to its  indebtedness at any time prohibit the current payment of  distributions,
whether  or not the  Partnership  has  earnings,  whether or not there are funds
legally available for the payment of such  distributions and whether or not such
distributions are authorized.  Accrued but unpaid  distributions on the Series C
Preferred Units will  accumulate as of the Series C Preferred Unit  Distribution
Payment Date on which they first  become  payable.  Distributions  on account of
arrears for any past distribution  periods may be declared and paid at any time,
without reference to a regular Series C Preferred Unit Distribution Payment Date
to holders of record of the Series C Preferred Units on the record date fixed by
the  Partnership  acting through the General Partner which date shall not exceed
fifteen (15)  Business Days prior to the payment  date.  Accumulated  and unpaid
distributions will not bear interest.

        (d) Priority as to  Distributions.  Subject to the provisions of Article
13 of the Partnership Agreement:

        (i) so  long  as any  Series  C  Preferred  Units  are  outstanding,  no
distribution  of cash or other property shall be authorized,  declared,  paid or
set apart for payment on or with  respect to any class or series of  Partnership
Interest  ranking  junior as to the  payment of  distributions  or rights upon a
voluntary  or  involuntary   liquidation,   dissolution  or  winding-up  of  the
Partnership to the Series C Preferred Units (collectively,  "Junior Units"), nor
shall any cash or other  property  be set aside for or applied to the  purchase,
redemption  or other  acquisition  for  consideration  of any Series C Preferred
Units, any Parity Preferred Units or any Junior Units, unless, in each case, all
distributions  accumulated  on all Series C Preferred  Units and all classes and
series of  outstanding  Parity  Preferred  Units  have  been  paid in full.  The
foregoing sentence shall not prohibit (x) distributions payable solely in Junior
Units,  or (y) the  conversion  of Junior Units or Parity  Preferred  Units into
Partnership  Interests  ranking  junior to the  Series C  Preferred  Units as to
distributions and rights upon involuntary or voluntary liquidation,  dissolution
or winding up of the Partnership or (z) the redemption of Partnership  Interests
corresponding  to Series C Preferred  Stock,  Parity  Preferred  Stock or Junior
Stock to be  purchased  by the  General  Partner  pursuant  to the  Articles  of
Incorporation  of the General  Partner  with  respect to the  General  Partner's
common stock and  comparable  provisions in the Articles of  Incorporation  with
respect to other  classes or series of capital  stock of the General  Partner to
preserve  the  General  Partner's  status  as a real  estate  investment  trust,
provided that such redemption shall be upon the same terms as the  corresponding
purchase pursuant to the Articles of Incorporation.

        (ii) So long as  distributions  have  not  been  paid in full  (or a sum
sufficient  for such full  payment  is not  irrevocably  deposited  in trust for
payment) upon the Series C Preferred  Units,  all  distributions  authorized and
declared  on the  Series  C  Preferred  Units  and  all  classes  or  series  of
outstanding  Parity Preferred Units shall be authorized and declared so that the
amount of distributions  authorized and declared per Series C Preferred Unit and
such other classes or series of Parity  Preferred  Units shall in all cases bear
to each other the same ratio that accrued  distributions  per Series C Preferred
Unit and such other classes or series of Parity Preferred Units (which shall not
include  any  accumulation  in  respect  of  unpaid   distributions   for  prior
distribution  periods if such class or series of Parity  Preferred  Units do not
have cumulative distribution rights) bear to each other.

        (e) No Further Rights.  Holders of Series C Preferred Units shall not be
entitled  to any  distributions,  whether  payable in cash,  other  property  or
otherwise. in excess of the full cumulative distributions described herein.

        Section 4. Allocations.  Section 6.1(a)(ii) of the Partnership Agreement
is amended to read, in its entirety, as follows:

        "(ii)(A)  Notwithstanding  anything to the  contrary  contained  in this
Agreement,  in any taxable year:  (1) the holders of Series A, B and C Preferred
Units shall first be  allocated  an amount of gross income equal to the Priority
Return  distributed to such holders in such taxable year, and (2) subject to any
prior  allocation of Profit pursuant to the loss chargeback set forth in Section
6.1(a)(ii)(B)  below,  the  holders of Series X  Preferred  Units  shall then be
allocated an amount of Profit equal to the Priority  Return  distributed to such
holders either in such taxable year or in prior taxable years to the extent that
such distributions have not previously been matched with an allocation of Profit
pursuant to this Section 6.1(a)(ii)(A)(2).

        (B) After the  Capital  Account  balances  of all  Partners  other  than
holders of any series of Preferred  Units have been  reduced to zero,  Losses of
the Partnership that otherwise would be allocated so as to cause deficit Capital
Account  balances for those other  Partners shall be allocated to the holders of
the Series A, B, C and X Preferred Units in proportion to the positive  balances
of their Capital Accounts until those Capital Account balances have been reduced
to zero. If Losses have been  allocated to the holders of the Series A, B, C and
X Preferred  Units  pursuant to the  preceding  sentence,  the first  subsequent
Profits  shall be  allocated  to those  preferred  partners so as to recoup,  in
reverse order, the effects of the loss allocations.

        (C) Upon  liquidation of the  Partnership or the interest of the holders
of Series A, B , C or X Preferred  Units in the  Partnership: (1) items of gross
income or deduction shall first be allocated to the holders of Series A, B and C
Preferred Units in a manner such that,  immediately  prior to such  liquidation,
the Capital  Account  balances of such  holders  shall equal the amount of their
Liquidation  Preferences,  and (2) an amount of  Profit  or Loss  shall  then be
allocated  to the  holders of Series X  Preferred  Units in a manner  such that,
immediately  prior to such  liquidation,  the Capital  Account  balances of such
holders shall equal the amount of their Liquidation Preferences."

        Section 5. Optional Redemption. (a) Right of Optional Redemption. Except
as otherwise  provided herein,  the Series C Preferred Units may not be redeemed
prior to the fifth (5th)  anniversary  of the  issuance  date.  On or after such
date,  the  Partnership  shall have the right to redeem  the Series C  Preferred
Units,  in whole (and not in part),  at any time, upon not less than 30 nor more
than 60 days written notice,  at a redemption  price,  payable in cash, equal to
the  Liquidation  Preference (the "Series C Redemption  Price").  The Redemption
Right  given to Limited  Partners in Section  8.6 of the  Partnership  Agreement
shall not be  available  to the holders of the Series C Preferred  Units and all
references  to Limited  Partners in said Section 8.6 (and related  provisions of
the Partnership  Agreement)  shall not include holders of the Series C Preferred
Units.

        (b)  Procedures  for  Redemption.  (i) Notice of redemption  will be (A)
faxed,  and (B) mailed by the Partnership,  by certified mail,  postage prepaid,
not less than 30 nor more than 60 days prior to the redemption  date,  addressed
to the  respective  holders of record of the Series C  Preferred  Units at their
respective  addresses  as they  appear on the  records  of the  Partnership.  No
failure  to give or defect in such  notice  shall  affect  the  validity  of the
proceedings  for the redemption of any Series C Preferred Units except as to the
holder to whom such  notice was  defective  or not  given.  In  addition  to any
information  required by law each such notice  shall state:  (m) the  redemption
date, (n) the Redemption  Price,  (o) the aggregate number of Series C Preferred
Units to be redeemed,  (p) as provided in Section  5(b)(ii) below,  the place or
places where evidence of the surrender of such Series C Preferred Units shall be
delivered for payment of the Redemption  Price,  (q) that  distributions  on the
Series C  Preferred  Units to be  redeemed  will  cease  to  accumulate  on such
redemption  date and (r) that payment of the Redemption  Price will be made upon
presentation  of evidence of the  surrender of such Series C Preferred  Units as
set forth in Section 5(b)(ii) below.

        (ii) If the  Partnership  gives a notice of  redemption  in  respect  of
Series C Preferred Units (which notice will be irrevocable) then, by 12:00 noon,
New York City time, on the redemption  date, the  Partnership  will deliver into
escrow with an escrow agent acceptable to the Partnership and the holders of the
Series C  Preferred  Units (the  "Escrow  Agent")  the  Redemption  Price and an
executed  Redemption  Agreement,  in the form attached  hereto as Exhibit A (the
"Redemption   Agreement"),   and  an  Amendment  to  the  Agreement  of  Limited
Partnership evidencing the Redemption, in the form attached hereto as Exhibit B.
The holders of the Series C Preferred  Units shall also, by 12:00 noon, New York
City time, on the redemption date,  deliver into escrow with the Escrow Agent an
executed  Redemption  Agreement  and an executed  Amendment to the  Agreement of
Limited  Partnership  evidencing  the  Redemption.  Upon  delivery of all of the
above-described items by both parties, Escrow Agent shall release the Redemption
Price to the  holders of the  Series C  Preferred  Units and the  fully-executed
Redemption  Agreement and Amendment to Agreement of Limited  Partnership to both
parties.  On and  after  the date of  redemption,  distributions  will  cease to
accumulate  on the Series C Preferred  Units called for  redemption,  unless the
Partnership defaults in the payment thereof. If any date fixed for redemption of
Series C Preferred  Units is not a Business Day, then payment of the  Redemption
Price  payable  on such date will be made on the next  succeeding  day that is a
Business Day (and  without any interest or other  payment in respect of any such
delay) except that, if such Business Day falls in the next calendar  year,  such
payment will be made on the  immediately  preceding  Business  Day, in each case
with the same force and effect as if made on such date fixed for redemption.  If
payment of the Redemption  Price is improperly  withheld or refused and not paid
by the Partnership, distributions on such Series C Preferred Units will continue
to accumulate from the original redemption date to the date of payment, in which
case the actual  payment date will be considered  the date fixed for  redemption
for purposes of calculating the applicable Redemption Price.

        Section 6. Voting Rights. (a) General. Holders of the Series C Preferred
Units  will not have any  voting  rights  or  right  to  consent  to any  matter
requiring the consent or approval of the Limited  Partners,  except as set forth
in Section 14.1 of the Partnership  Agreement and in this Section 6. (Solely for
purposes of Section 14.1 of the Partnership  Agreement,  each Series C Preferred
Unit  shall  be  treated  as one  Partnership  Unit.)  If and for so long as the
General  Partner holds any Series C Preferred  Units,  the General Partner shall
not have any voting  rights with  respect to such  Series C Preferred  Units and
such Series C Preferred  Units shall not be counted in determining the number of
such units  outstanding  for the purpose of  determining  whether the holders of
such units have granted any approval called for hereunder.

        (b)  Certain  Voting  Rights.  So long as any Series C  Preferred  Units
remain  outstanding,  the Partnership shall not, without the affirmative vote of
the holders of at least a majority of the Series C Preferred  Units  outstanding
at the time:

        (i) authorize or create, or increase the authorized or issued amount of,
any class or series of  Partnership  Interests  ranking  senior to the  Series C
Preferred  Units  with  respect  to  payment  of  distributions  or rights  upon
liquidation,  dissolution or winding-up or reclassify any Partnership  Interests
into  any  such  Partnership  Interest,  or  create,   authorize  or  issue  any
obligations or security convertible into or evidencing the right to purchase any
such Partnership Interests;

        (ii)  designate or create,  or increase the  authorized or issued amount
of,  any  Parity  Preferred  Units  or  reclassify  any  authorized  Partnership
Interests into any such Parity  Preferred  Units, or create,  authorize or issue
any obligations or security convertible into or evidencing the right to purchase
any such shares,  but only to the extent such Parity  Preferred Units are issued
to an Affiliate of the  Partnership  on terms that differ from the terms of such
series of Parity Preferred Units issued to the public or  non-Affiliates  of the
Partnership (for purposes of this Section  6(b)(ii),  an issuance to the General
Partner  shall not be treated as an issuance to an Affiliate of the  Partnership
to the  extent  the  issuance  of such  Partnership  Interests  was to allow the
General  Partner to issue  corresponding  preferred stock to persons who are not
Affiliates); or

        (iii) either (A) exchange  shares,  consolidate,  merge into or with, or
convey,  transfer  or lease its  assets  substantially  as an  entirety  to, any
corporation or other entity or (B) amend,  alter or repeal the provisions of the
Partnership Agreement, whether by merger, consolidation or otherwise, that would
materially  and  adversely  affect  the  powers,  special  rights,  preferences,
privileges  or  voting  power of the  Series C  Preferred  Units or the  holders
thereof;  provided,  however,  that with  respect to the  occurrence  of a share
exchange,  merger,  consolidation or a sale or lease of all of the Partnership's
assets as an entirety,  so long as (1) the  Partnership is the surviving  entity
and the Series C  Preferred  Units  remain  outstanding  with the terms  thereof
unchanged,   or  (2)  the  resulting,   surviving  or  transferee  entity  is  a
partnership,  limited liability company or other  pass-through  entity organized
under the laws of any state and  substitutes  the Series C  Preferred  Units for
other interests in such entity having substantially the same terms and rights as
the Series C Preferred Units,  including with respect to  distributions,  voting
rights  and  rights  upon  liquidation,  dissolution  or  winding-up,  then  the
occurrence  of any such  event  shall  not be deemed to  adversely  affect  such
rights,  privileges  or voting  powers of the  holders of the Series C Preferred
Units;  and  provided  further  that any  increase in the amount of  Partnership
Interests  or the  creation  or  issuance  of  any  other  class  or  series  of
Partnership Interests, in each case ranking (y) junior to the Series C Preferred
Units with respect to payment of  distributions  or the  distribution  of assets
upon liquidation,  dissolution or winding-up, or (z) on a parity to the Series C
Preferred Units with respect to payment of  distributions or the distribution of
assets  upon  liquidation,   dissolution  or  winding-up,  to  the  extent  such
Partnership  Interests  are not issued to an  Affiliate of the  Partnership  (an
issuance  to the  General  partner  shall not be  treated as an  issuance  to an
Affiliate  of the  Partnership  to the extent the  issuance of such  Partnership
Interests  was to allow the  General  Partner to issue  corresponding  preferred
stock to persons who are not Affiliates of the Partnership)  such issuance shall
not be deemed to  materially  and  adversely  affect such  rights,  preferences,
privileges or voting powers.

        In addition to the foregoing,  the  Partnership  will not (x) enter into
any contract,  mortgage, loan or other agreement that prohibits or restricts, or
has the effect of  prohibiting  or  restricting,  the ability of a holder of the
Preferred  Units to  exercise  its rights set forth  herein to effect in full an
exchange or  redemption  pursuant  to Section 8, below,  except with the written
consent of such holder; or (y) amend,  alter, or repeal or waive Sections 7.6 or
11.3(f) of the Partnership  Agreement without the affirmative vote of at least a
majority of the Series C Preferred Units outstanding at the time.

        Section 7.  Transfer  Restrictions.  The  holders of Series C  Preferred
Units shall be subject to all of the provisions of Section 11 of the Partnership
Agreement  except  Section  11.3(b),  as modified by this Section 7. The General
Partner  shall not  unreasonably  withhold  consent  to a transfer  required  by
Section 11.3 (a). Subject to the consent of the General Partner, which shall not
be  unreasonably  withheld  or  delayed,  the  Series C  Preferred  Units may be
transferred  to a maximum  of five (5)  persons.  At no time shall the number of
holders of the Series C Preferred Units exceed five.

        Section  8.  Exchange  Rights.  (a)  Right  to  Exchange.  (i)  Series C
Preferred  Units will be  exchangeable in whole (and not in part) at any time on
or after the tenth (10th) anniversary of the date of issuance,  at the option of
the Partnership or a majority of the holders  thereof  (acting as a whole),  for
authorized  but  previously  unissued  shares  of 8  3/4%  Series  C  Cumulative
Redeemable  Preferred  Stock of the  General  Partner  (the  "Series C Preferred
Stock") at an  exchange  rate of one share of Series C  Preferred  Stock for one
Series C Preferred Unit, subject to adjustment as described below (the "Series C
Exchange  Price");  provided  that the  Series C  Preferred  Units  will  become
exchangeable  at any  time,  in whole  (and not in  part),  at the  option  of a
majority  of the  holders of Series C  Preferred  Units  (acting as a whole) for
Series C Preferred  Stock if (x) at any time full  distributions  shall not have
been timely made on any Series C  Preferred  Unit with  respect to six (6) prior
quarterly distribution periods, whether or not consecutive;  provided,  however,
that a distribution  in respect of Series C Preferred  Units shall be considered
timely made if made within two (2) Business Days after the  applicable  Series C
Preferred  Units  Distribution  Payment Date if at the time of such late payment
there shall not be any prior quarterly  distribution periods in respect of which
full  distributions  were not  timely  made or (y) upon  receipt  by a holder or
holders of Series C Preferred  Units of (1) notice from the General Partner that
the General  Partner or a Subsidiary of the General  Partner has become aware of
facts that will or likely will cause the Partnership to become a PTP, and (2) an
opinion  rendered  by  an  outside  nationally  recognized  independent  counsel
familiar  with  such  matters  addressed  to a holder  or  holders  of  Series C
Preferred Units, that the Partnership is or likely is, or upon the occurrence of
a defined  event in the  immediate  future  will be or likely  will be a PTP. In
addition to and not in limitation of the foregoing, the Series C Preferred Units
may be exchanged for Series C Preferred  Stock,  in whole (and not in part),  at
the option of the holders of a majority of the Series C Preferred  Units (acting
as a whole) prior to the tenth (10th) anniversary of the issuance date and after
the third  anniversary  thereof if such holder of Series C Preferred Units shall
deliver to the General  Partner either (i) a private letter ruling  addressed to
such  holder of  Series C  Preferred  Units or (ii) an  opinion  of  independent
counsel  reasonably  acceptable to the General Partner based on the enactment of
temporary  or  final  Treasury  Regulations  since  the date of  Closing  or the
publication  of a Revenue Ruling since the date of Closing in either case to the
effect that an exchange of the Series C  Preferred  Units at such  earlier  time
would  not  cause the  Series C  Preferred  Units to be  considered  "stock  and
securities" within the meaning of section 351(e) of the Internal Revenue Code of
1986, as amended (the "Code") for purposes of determining  whether the holder of
such Series C Preferred Units is an "investment company" under section 721(b) of
the Code if an exchange is permitted at such earlier date.

        In  addition to and not in  limitation  of the  foregoing,  the Series C
Preferred  Units may be  exchanged  in whole  (and not in part)  (regardless  of
whether held by  Contributor)  at the option of the holders of a majority of the
Series C Preferred  Units (acting as a whole) for Series C Preferred  Stock (but
only  if the  exchange  in  whole  may be  accomplished  consistently  with  the
ownership  limitations  set forth  under the  Article  IV of the  Charter of the
General Partner,  taking into account exceptions  thereto) if at any time either
(x) the  General  Partner  has  provided  notice to the  holders of the Series C
Preferred  Units pursuant to Section 4(e) of the  Contribution  Agreement by and
among the  Contributor,  LLC, the General  Partner and the Partnership or (y)(i)
such holders  conclude  based on results or projected  results that there exists
(in the reasonable  judgment of such holders) an imminent and  substantial  risk
that the Series C Preferred Units represent or will represent more than 18.0% of
the total profits of or capital interests in the Partnership for a taxable year,
(ii) such  holders  deliver to the  General  Partner  an  opinion of  nationally
recognized independent counsel, reasonably acceptable to the General Partner, to
the effect that there is a substantial risk that its interest in the Partnership
does not or will not satisfy  the 18.0%  limit,  and (iii) the  General  Partner
agrees  with  the  conclusions  referred  to in  clauses  (i)  and  (ii) of this
sentence, such agreement not to be unreasonably withheld.

        (ii)  Notwithstanding  anything  to the  contrary  set forth in  Section
8(a)(i),  if an Exchange Notice (as  hereinafter  defined) has been delivered to
the General  Partner,  then the  General  Partner  may, at its option,  elect to
redeem  or cause  the  Partnership  to  redeem  all (but not a  portion)  of the
outstanding  Series  C  Preferred  Units  for  cash in an  amount  equal  to the
Liquidation  Preference  per Series C Preferred  Unit.  The General  Partner may
exercise its option to redeem the Series C Preferred  Units for cash pursuant to
this  Section  8(a)(ii)  by giving  each  holder of record of Series C Preferred
Units notice of its election to redeem for cash,  within five (5) Business  Days
after  receipt of the  Exchange  Notice,  by (m) fax, and (n)  registered  mail,
postage  paid at the  address of each  holder as it may appear on the records of
the Partnership  stating (A) the redemption  date,  which shall be no later than
sixty (60) days following the receipt of the Exchange Notice, (B) the redemption
price,  (C) the place or places  where the  Series C  Preferred  Units are to be
surrendered for payment of the redemption  price, (D) that  distributions on the
Series C Preferred Units will cease to accrue on such redemption  date; (E) that
payment of the redemption price will be made upon  presentation and surrender of
the Series C Preferred Units and (F) the aggregate  number of Series C Preferred
Units to be redeemed.

        (iii) If an  exchange of Series C  Preferred  Units  pursuant to Section
8(a)(i)  would  violate the  provisions  on ownership  limitation of the General
Partner  set forth in Article  IV of the  Charter of the  General  Partner  with
respect to the Series C Preferred  Stock the General  Partner shall give written
notice thereof to each holder of record of Series C Preferred Units, within five
(5) Business Days following  receipt of the Exchange Notice, by (m) fax, and (n)
registered mail,  postage prepaid,  at the address of each such holder set forth
in the  records  of the  Partnership.  In such  event,  each  holder of Series C
Preferred  Units shall be entitled to exchange,  pursuant to the  provisions  of
Section  8(b) a number of Series C Preferred  Units which would  comply with the
provisions on the ownership  limitation of the General Partner set forth in such
Article IV of the  Charter of the  General  Partner  and any Series C  Preferred
Units not so exchanged (the "Excess Units") shall be redeemed by the Partnership
for cash in an amount equal to the Liquidation Preference. The written notice of
the  General  Partner  shall  state (A) the number of Excess  Units held by such
holder, (B) the redemption price of the Excess Units, (C) the date on which such
Excess  Units  shall be  redeemed,  which date shall be no later than sixty (60)
days following the receipt of the Exchange Notice, (D) the place or places where
such Excess Units are to be surrendered for payment of the Redemption Price, (E)
that  distributions  on the Excess Units will cease to accrue on such redemption
date,  and  (F)  that  payment  of  the  redemption  price  will  be  made  upon
presentation  and surrender of such Excess Units. If an exchange would result in
Excess Units, as a condition to such exchange,  each holder of such units agrees
to provide  representations  and covenants  reasonably  requested by the General
Partner  relating to (1) the widely held nature of the interests in such holder,
sufficient to assure the General Partner that the holder's ownership of stock of
the General  Partner  (without  regard to the limits  described  above) will not
cause any Person (as such term is defined in the Charter of the General Partner)
to own stock of the  General  Partner in an amount  that would cause such Person
not to comply with the  provisions  of the  ownership  limitation of the General
Partner set forth in such  Article IV of the  Articles of  Incorporation  of the
General Partner; and (2) to the extent such holder can so represent and covenant
without obtaining information from its owners, the holder's ownership of tenants
of the Partnership and its affiliates.

        To the extent the General  Partner would not be able to pay the cash set
forth above in exchange for the Excess Units, and to the extent  consistent with
the Articles of Incorporation,  the General Partner agrees that it will grant to
the  holders  of the  Series C  Preferred  Units  exceptions  to the  Beneficial
Ownership  Limit and  Constructive  Ownership  Limit  set forth in the  Series C

Certificate of Determination sufficient to allow such holders to exchange all of
their  Series C Preferred  Units for Series C  Preferred  Stock,  provided  such
holders furnish to the General Partner representations acceptable to the General
Partner in its sole and absolute  discretion  which  assure the General  Partner
that such exceptions  will not jeopardize the General  Partner's tax status as a
REIT for purposes of federal and applicable state law.

        Notwithstanding  any  provision  of the  Agreement to the  contrary,  no
Series C Limited  Partner  shall be  entitled  to effect an exchange of Series C
Preferred  Units for Series C Preferred  Stock to the extent that  ownership  or
right to acquire  such shares would cause the Partner or any other Person or, in
the opinion of counsel selected by the General Partner, may cause the Partner or
any other  Person,  to violate the  restrictions  on  ownership  and transfer of
Series C  Preferred  Stock set forth in the  Articles of  Incorporation.  To the
extent any such  attempted  exchange  for Series C  Preferred  Stock would be in
violation of the previous sentence, it shall be void ab initio and such Series C
Limited Partner shall not acquire any rights or economic  interest in the Series
C Preferred Stock otherwise issuable upon such exchange.

        (iv) The  redemption of Series C Preferred  Units  described in Sections
8(a) (ii) and (iii) shall be subject to the  provisions of Sections  5(b)(i) and
(ii); provided,  however, that the term "redemption price" in such Section shall
be read to mean the  Liquidation  Preference  per Series C Preferred  Unit being
redeemed.

        (b) Procedure for Exchange. (i) Any exchange shall be exercised pursuant
to a notice of exchange (the "Exchange Notice") delivered to the General Partner
by the holder  who is  exercising  such  exchange  right,  by (a) fax and (b) by
certified mail postage prepaid.  The exchange of Series C Preferred Units may be
effected  after the fifth (5th)  Business Day  following  receipt by the General
Partner of the Exchange Notice by delivering  certificates if any,  representing
such Series C Preferred  Units to be exchanged  together  with,  if  applicable,
written  notice of exchange and a proper  assignment  of such Series C Preferred
Units  to the  office  of the  General  Partner  maintained  for  such  purpose.
Currently,  such  office is c/o PS Business  Parks,  Inc.,  701 Western  Avenue,
Glendale,  California 91201, Attention:  Jack E. Corrigan. Each exchange will be
deemed to have been effected  immediately  prior to the close of business on the
date on which such Series C Preferred  Units to be exchanged  (together with all
required  documentation)  shall have been surrendered and notice shall have been
received by the General  Partner as aforesaid and the Exchange  Price shall have
been paid. Any Series C Preferred  Stock issued pursuant to this Section 8 shall
be delivered as shares which are duly authorized, validly issued, fully paid and
nonassessable, free of pledge, lien, encumbrance or restriction other than those
provided in the Charter,  the ByLaws of the General Partner,  the Securities Act
of 1933, as amended and relevant state securities or blue sky laws.

        (ii) In the event of an exchange of Series C Preferred  Units for shares
of Series C Preferred  Stock, an amount equal to the accrued and unpaid Priority
Return,  whether  or not  declared,  to the  date of  exchange  on any  Series C
Preferred  Units  tendered  for  exchange  shall (a) accrue on the shares of the
Series C Preferred Stock into which such Series C Preferred Units are exchanged,
and (b) continue to accrue on such Series C Preferred Units,  which shall remain
outstanding  following such exchange,  with the General Partner as the holder of
such Series C Preferred  Units.  Notwithstanding  anything to the  contrary  set
forth herein,  in no event shall a holder of a Series C Preferred  Unit that was
validly  exchanged into Series C Preferred Stock pursuant to this section (other
than the General  Partner now holding such Series C Preferred  Unit),  receive a
distribution from the Partnership,  if such holder, after exchange,  is entitled
to receive a distribution  from the General Partner with respect to the share of
Series C Preferred Stock for which such Series C Preferred Unit was exchanged or
redeemed.

        (iii) Fractional shares of Series C Preferred Stock are not to be issued
upon  exchange  but,  in lieu  thereof,  the  General  Partner  will  pay a cash
adjustment  based upon the fair market value of the Series C Preferred  Stock on
the day prior to the exchange  date as  determined in good faith by the Board of
Directors of the General Partner.

        (c) Adjustment of Exchange  Price.  (i) The Exchange Price is subject to
adjustment upon certain events,  including,  (a) subdivisions,  combinations and
reclassification  of the Series C Preferred Stock, and (b)  distributions to all
holders of Series C Preferred  Stock of evidences of indebtedness of the General
Partner  or  assets   (including   securities,   but  excluding   dividends  and
distributions  paid in cash out of  equity  applicable  to  Series  C  Preferred
Stock).

        (ii) In case the  General  Partner  shall be a party to any  transaction
(including,  without  limitation,  a  merger,  consolidation,   statutory  share
exchange,  tender offer for all or  substantially  all of the General  Partner's
capital  stock  or sale of all or  substantially  all of the  General  Partner's
assets),  in each case as a result of which the Series C Preferred Stock will be
converted into the right to receive shares of capital stock, other securities or
other  property  (including  cash or any  combination  thereof),  each  Series C
Preferred  Unit will  thereafter  be  exchangeable  into the kind and  amount of

shares of capital stock and other securities and property receivable  (including
cash or any combination  thereof) upon the consummation of such transaction by a
holder of that number of shares of Series C Preferred Stock or fraction  thereof
into which one Series C Preferred  Unit was  exchangeable  immediately  prior to
such  transaction.  The  General  Partner  may not  become  a party  to any such
transaction  unless the terms  thereof are  consistent  with the  foregoing.  In
addition,  so  long  as a  Series  C  Limited  Partner  or any of its  permitted
successors or assigns,  hold any Series C Preferred  Units,  as the case may be,
the General Partner shall not, without the affirmative vote of the holders of at
least a majority of the Series C Preferred  Units  outstanding  at the time: (a)
designate or create,  or increase the  authorized or issued amount of, any class
or series of shares ranking senior to the Series C Preferred  Stock with respect
to the payment of  distributions  or rights  upon  liquidation,  dissolution  or
winding-up or reclassify any authorized  shares of the General  Partner into any
such  shares,  or  create,  authorize  or issue any  obligations  or  securities
convertible  into or  evidencing  the right to purchase any such shares;  or (b)
amend,  alter or repeal the  provisions  of the Charter or bylaws of the General
Partner,  whether by merger,  consolidation or otherwise,  that would materially
and adversely  affect the powers,  special  rights,  preferences,  privileges or
voting power of the Series C Preferred Stock or the holders  thereof;  provided,
however,, that any increase in the amount of authorized  Preferred Shares or the
creation or issuance of any other  series or class of Preferred  Shares,  or any
increase  in the amount of  authorized  shares of each class or series,  in each
case ranking  either (1) junior to the Series C Preferred  Stock with respect to
the payment of distributions  and the  distribution of assets upon  liquidation,
dissolution or winding-up,  or (2) on a parity with the Series C Preferred Stock
with respect to the payment of distributions and the distribution of assets upon
liquidation,  dissolution  or winding-up  shall not be deemed to materially  and
adversely affect such rights,  preferences,  privileges or voting powers. In the
event of a conflict  between the  provisions  of this  Section  8(c)(ii) and any
provision of the Partnership Agreement,  the provisions of this Section 8(c)(ii)
shall control.

         Section 9. No Conversion Rights.  Except as set forth in Section 8, the
holders of the  Series C  Preferred  Units  shall not have any rights to convert
such units into  shares of any other  class or series of stock or into any other
securities of, or interest in, the Partnership.

        Section 10. No Sinking  Fund. No sinking fund shall be  established  for
the retirement or redemption of Series C Preferred Units.

        Section 11. Exhibit A to Partnership Agreement. In order to duly reflect
the  issuance  of  the  Series  C  Preferred  Units  provided  for  herein,  the
Partnership Agreement is hereby further amended pursuant to Section 12.3 thereof
by deleting Exhibit A thereto and replacing Exhibit A attached hereto therefor.

        Section 12. Inconsistent  Provisions.  Nothing to the contrary contained
in the  Partnership  Agreement  shall limit any of the rights or obligations set
forth in this Amendment.

        IN WITNESS WHEREOF this Amendment has been executed as of the date first
above written.

                                        PS BUSINESS PARKS, INC.


                                        By: /s/ Jack Corrigan
                                            ----------------------
                                            Jack Corrigan
                                            Vice President and
                                            Chief Financial Officer




                                                                   Exhibit 10.24

                             PS BUSINESS PARKS, L.P.

                        AMENDMENT TO AGREEMENT OF LIMITED
                             PARTNERSHIP RELATING TO
                      8 7/8% SERIES X CUMULATIVE REDEEMABLE
                                 PREFERRED UNITS

        This  Amendment to the Agreement of Limited  Partnership  of PS Business
Parks, L.P. a California limited  partnership (the  "Partnership"),  dated as of
the 7th day of  September,  1999  (this  "Amendment")  amends the  Agreement  of
Limited Partnership of the Partnership,  dated as of March 17, 1998 by and among
PS Business Parks, Inc. (the "General Partner") and each of the limited partners
executing a signature page thereto, as amended  (collectively,  the "Partnership
Agreement").  Capitalized terms used herein and not otherwise defined shall have
the  meanings  ascribed  to such  terms in the  Partnership  Agreement.  Section
references  are  (unless  otherwise  specified)  references  to sections in this
Amendment.

        WHEREAS,  pursuant to Section 4.2(a) of the Partnership  Agreement,  the
General Partner desires to cause the Partnership to issue  additional Units of a
new  class  and  series,  with  the  designations,   preferences  and  relative,
participating,  optional or other  special  rights,  powers and duties set forth
herein;

        WHEREAS,  pursuant to Section 4.2(a) of the Partnership  Agreement,  the
General  Partner,  without the consent of the  Limited  Partners,  may amend the
Partnership  Agreement by executing a written instrument setting forth the terms
of such amendment; and

        WHEREAS,  the General  Partner desires by this Amendment to so amend the
Partnership  Agreement  as of the date first set forth  above to provide for the
designation and issuance of such new class and series of Units.

        NOW,  THEREFORE,   the  Partnership   Agreement  is  hereby  amended  by
establishing  and fixing the rights,  limitations and preferences of a new class
and series of Units as follows:

        Section 1.  Definitions.  Capitalized terms not otherwise defined herein
shall have their  respective  meanings set forth in the  Partnership  Agreement.
Capitalized  terms that are used in this  Amendment  shall have the meanings set
forth below:

        (a)  "Liquidation  Preference"  means,  with  respect  to the  Series  X
Preferred  Units,  $25.00 per Series X  Preferred  Unit,  plus the amount of any
accumulated and unpaid Priority Return with respect to such unit, whether or not
declared,  minus any  distributions  in excess of the  Priority  Return that has
accrued with respect to such Series X Preferred Units to the date of payment.

        (b) "Parity  Preferred  Units" means any class or series of  Partnership
Interests of the Partnership now or hereafter authorized,  issued or outstanding
and expressly  designated by the Partnership to rank in parity with the Series X
Preferred  Units (as  hereinafter  defined)  with respect to  distributions  and
rights upon voluntary or involuntary  liquidation,  winding-up or dissolution of
the Partnership.  Notwithstanding  the differing  allocation rights set forth in
Section  4 below  that  apply to the  Series  A, B and C  Preferred  Units,  for
purposes  of this  Amendment  those  Series A, B and C  Preferred  Units and any
future  series of  preferred  units that rank in parity  with those  series also
shall be considered Parity Preferred Units to the Series X Preferred Units.

        (c)  "Priority  Return" means an amount equal to 8 7/8% per annum of the
Liquidation  Preference per Series X Preferred  Unit,  commencing on the date of
issuance of such Series X Preferred  Unit,  determined on the basis of a 365-day
year (and actual days for any period)  cumulative to the extent not  distributed
on any Series X Preferred Unit Distribution Payment Date.

        (d) "PTP" means a "publicly  traded  partnership"  within the meaning of
Section 7704 of the Code.

        Section 2.  Designation  and Number.  Pursuant to Section  4.2(a) of the
Partnership  Agreement,  a  series  of  Partnership  Units  in  the  Partnership
designated as the "8 7/8% Series X Cumulative  Redeemable  Preferred Units" (the
"Series X  Preferred  Units")  is  hereby  established.  The  number of Series X
Preferred  Units shall be  1,200,000.  The  Holders of Series X Preferred  Units
shall  not  have  any  Percentage  Interest  (as  such  term is  defined  in the
Partnership Agreement) in the Partnership.

      Section 3. Distributions.  (a) Payment of Distributions.  Subject to the
rights of holders of Parity Preferred Units as to the payment of  distributions,
pursuant  to  Section  5.1 of the  Partnership  Agreement,  holders  of Series X
Preferred  Units shall be entitled to receive,  when,  as and if declared by the
Partnership  acting  through the General  Partner,  the  Priority  Return.  Such
distributions  shall be  cumulative,  shall  accrue  from the  original  date of
issuance of the Series X Preferred Units and, notwithstanding Section 5.1 of the
Partnership  Agreement,  will be payable (i)  quarterly  in arrears on March 31,
June 30,  September 30 and December 31 of each year  commencing on September 30,
1999, and (ii) in the event of a redemption of Series X Preferred  Units (each a
"Series X  Preferred  Unit  Distribution  Payment  Date").  If any date on which
distributions  are to be made on the Series X Preferred  Units is not a Business
Day (as defined  herein),  then payment of the  distribution  to be made on such
date will be made on the Business Day  immediately  preceding such date with the
same  force and effect as if made on such  date.  Distributions  on the Series X
Preferred  Units will be made to the holders of record of the Series X Preferred
Units on the relevant record dates to be fixed by the Partnership acting through
the General  Partner,  which record dates shall in no event exceed  fifteen (15)
Business Days prior to the relevant Series X Preferred Unit Distribution Payment
Date (the "Series X Preferred Unit Partnership Record Date").

        (b) Prohibition on Distribution.  No distributions on Series X Preferred
Units  shall be  authorized  by the  General  Partner  or paid or set  apart for
payment by the  Partnership  at any such time as the terms and provisions of any
agreement of the  Partnership  or the General  Partner,  including any agreement
relating to their indebtedness, prohibits such authorization, payment or setting
apart for payment or provides that such authorization,  payment or setting apart
for payment would constitute a breach thereof or a default thereunder, or to the
extent that such  authorization  or payment shall be restricted or prohibited by
law.

        (c)  Distributions  Cumulative.  Distributions on the Series X Preferred
Units will accrue  whether or not the terms and  provisions  of any agreement of
the  Partnership,  including any agreement  relating to its  indebtedness at any
time  prohibit  the  current  payment  of  distributions,  whether  or  not  the
Partnership has earnings,  whether or not there are funds legally  available for
the  payment of such  distributions  and whether or not such  distributions  are
authorized.  Accrued but unpaid  distributions  on the Series X Preferred  Units
will accumulate as of the Series X Preferred Unit  Distribution  Payment Date on
which they first  become  payable.  Distributions  on account of arrears for any
past  distribution  periods  may be  declared  and  paid  at any  time,  without
reference  to a regular  Series X Preferred  Unit  Distribution  Payment Date to
holders of record of the Series X  Preferred  Units on the record  date fixed by
the  Partnership  acting through the General Partner which date shall not exceed
fifteen (15)  Business Days prior to the payment  date.  Accumulated  and unpaid
distributions will not bear interest.

        (d) Priority as to  Distributions.  Subject to the provisions of Article
13 of the Partnership Agreement:

        (i) so  long  as any  Series  X  Preferred  Units  are  outstanding,  no
distribution  of cash or other property shall be authorized,  declared,  paid or
set apart for payment on or with  respect to any class or series of  Partnership
Interest  ranking  junior as to the  payment of  distributions  or rights upon a
voluntary  or  involuntary   liquidation,   dissolution  or  winding-up  of  the
Partnership to the Series X Preferred Units (collectively,  "Junior Units"), nor
shall any cash or other  property  be set aside for or applied to the  purchase,
redemption  or other  acquisition  for  consideration  of any Series X Preferred
Units, any Parity Preferred Units or any Junior Units, unless, in each case, all
distributions  accumulated  on all Series X Preferred  Units and all classes and
series of  outstanding  Parity  Preferred  Units  have  been  paid in full.  The
foregoing sentence shall not prohibit (x) distributions payable solely in Junior
Units,  (y) the  conversion  of Junior  Units or  Parity  Preferred  Units  into
Partnership  Interests ranking junior to the Series X Preferred Units or (z) the
redemption of Partnership  Interests  corresponding to Series X Preferred Stock,
Parity  Preferred  Stock or Junior Stock to be purchased by the General  Partner
pursuant to the Articles of Incorporation  with respect to the General Partner's
common stock and comparable Articles of Incorporation provisions with respect to
other classes or series of capital stock of the General  Partner to preserve the
General Partner's status as a real estate  investment trust,  provided that such
redemption shall be upon the same terms as the  corresponding  purchase pursuant
to the Articles of Incorporation.

        (ii) So long as  distributions  have  not  been  paid in full  (or a sum
sufficient  for such full  payment  is not  irrevocably  deposited  in trust for
payment) upon the Series X Preferred  Units,  all  distributions  authorized and
declared  on the  Series  X  Preferred  Units  and  all  classes  or  series  of
outstanding  Parity Preferred Units shall be authorized and declared so that the
amount of distributions  authorized and declared per Series X Preferred Unit and
such other classes or series of Parity  Preferred  Units shall in all cases bear
to each other the same ratio that accrued  distributions  per Series X Preferred
Unit and such other classes or series of Parity Preferred Units (which shall not
include  any  accumulation  in  respect  of  unpaid   distributions   for  prior
distribution  periods if such class or series of Parity  Preferred  Units do not
have cumulative distribution rights) bear to each other.

    (e) No Further Rights.  Holders of Series X Preferred Units shall not be
entitled  to any  distributions,  whether  payable in cash,  other  property  or
otherwise in excess of the full cumulative distributions described herein.

        Section 4. Allocations.  Section 6.1(a)(ii) of the Partnership Agreement
is amended to read, in its entirety, as follows:

        "(ii) (A)  Notwithstanding  anything to the  contrary  contained in this
Agreement,  in any taxable year:  (1) the holders of Series A, B and C Preferred
Units shall first be  allocated  an amount of gross income equal to the Priority
Return  distributed to such holders in such taxable year, and (2) subject to any
prior  allocation of Profit pursuant to the loss chargeback set forth in Section
6.1(a)(ii)(B)  below,  the  holders of Series X  Preferred  Units  shall then be
allocated an amount of Profit equal to the Priority  Return  distributed to such
holders either in such taxable year or in prior taxable years to the extent that
such distributions have not previously been matched with an allocation of Profit
pursuant to this Section 6.1(a)(ii)(A)(2).

        (B) After the  Capital  Account  balances  of all  Partners  other  than
holders of any series of Preferred  Units have been  reduced to zero,  Losses of
the Partnership that otherwise would be allocated so as to cause deficit Capital
Account  balances for those other  Partners shall be allocated to the holders of
the Series A, B, C and X Preferred Units in proportion to the positive  balances
of their Capital Accounts until those Capital Account balances have been reduced
to zero. If Losses have been  allocated to the holders of the Series A, B, C and
X Preferred  Units  pursuant to the  preceding  sentence,  the first  subsequent
Profits  shall be  allocated  to those  preferred  partners so as to recoup,  in
reverse order, the effects of the loss allocations.

        (C) Upon  liquidation of the  Partnership or the interest of the holders
of Series A, B, C or X Preferred  Units in the  Partnership:  (1) items of gross
income or deduction shall first be allocated to the holders of Series A, B and C
Preferred Units in a manner such that,  immediately  prior to such  liquidation,
the Capital  Account  balances of such  holders  shall equal the amount of their
Liquidation  Preferences,  and (2) an amount of  Profit  or Loss  shall  then be
allocated  to the  holders of Series X  Preferred  Units in a manner  such that,
immediately  prior to such  liquidation,  the Capital  Account  balances of such
holders shall equal the amount of their Liquidation Preferences."

        Section 5. Optional Redemption. (a) Right of Optional Redemption. Except
as otherwise provided in this Amendment, the Series X Preferred Units may not be
redeemed prior to the fifth (5th)  anniversary of the issuance date. On or after
such date, the Partnership shall have the right to redeem the Series X Preferred
Units,  in whole (and not in part),  at any time, upon not less than 10 nor more
than 60 days written notice,  at a redemption  price,  payable in cash, equal to
the  Liquidation  Preference (the "Series X Redemption  Price").  The Redemption
Right  given to Limited  Partners in Section  8.6 of the  Partnership  Agreement
shall not be  available  to the holders of the Series X Preferred  Units and all
references  to Limited  Partners in said Section 8.6 (and related  provisions of
the Partnership  Agreement)  shall not include holders of the Series X Preferred
Units.  The Series X Redemption Price will not be payable out of proceeds from a
loan  obtained  by the  Partnership  solely  for the  purpose of payment of said
Series X Redemption Price.

        (b)  Procedures  for  Redemption.  (i) Notice of redemption  will be (A)
faxed,  and (B) mailed by the Partnership,  by certified mail,  postage prepaid,
not less than 10 nor more than 60 days prior to the redemption  date,  addressed
to the  respective  holders of record of the Series X  Preferred  Units at their
respective  addresses  as they  appear on the  records  of the  Partnership.  No
failure  to give or defect in such  notice  shall  affect  the  validity  of the
proceedings  for the redemption of any Series X Preferred Units except as to the
holder to whom such  notice was  defective  or not  given.  In  addition  to any
information  required by law each such notice  shall state:  (m) the  redemption
date, (n) the Redemption  Price,  (o) the aggregate number of Series X Preferred
Units to be redeemed,  (p) as provided in Section  5(b)(ii) below,  the place or
places where evidence of the surrender of such Series X Preferred Units shall be
delivered for payment of the Redemption  Price,  (q) that  distributions  on the
Series X  Preferred  Units to be  redeemed  will  cease  to  accumulate  on such
redemption  date and (r) that payment of the Redemption  Price will be made upon
presentation  of evidence of the  surrender of such Series X Preferred  Units as
set forth in Section 5(b)(ii) below.

        (ii) If the  Partnership  gives a notice of  redemption  in  respect  of
Series X Preferred Units (which notice will be irrevocable) then, by 12:00 noon,
New York City time, on the redemption  date, the  Partnership  will deliver into
escrow with an escrow agent acceptable to the Partnership and the holders of the
Series X  Preferred  Units (the  "Escrow  Agent")  the  Redemption  Price and an
executed  Redemption  Agreement,  in the form attached  hereto as Exhibit A (the
"Redemption   Agreement"),   and  an  Amendment  to  the  Agreement  of  Limited
Partnership evidencing the Redemption, in the form attached hereto as Exhibit B.
The holders of the Series X Preferred  Units shall also, by 12:00 noon, New York
City time, on the redemption date,  deliver into escrow with the Escrow Agent an
executed  Redemption  Agreement  and an executed  Amendment to the  Agreement of
Limited  Partnership  evidencing  the  Redemption.  Upon  delivery of all of the
above-described items by both parties, Escrow Agent shall release the Redemption
Price to the  holders of the  Series X  Preferred  Units and the  fully-executed
Redemption  Agreement and Amendment to Agreement of Limited  Partnership to both
parties.  On and  after  the date of  redemption,  distributions  will  cease to
accumulate  on the Series X Preferred  Units called for  redemption,  unless the
Partnership defaults in the payment thereof. If any date fixed for redemption of
Series X Preferred  Units is not a Business Day, then payment of the  Redemption
Price  payable  on such date will be made on the next  succeeding  day that is a
Business Day (and  without any interest or other  payment in respect of any such
delay) except that, if such Business Day falls in the next calendar  year,  such
payment will be made on the  immediately  preceding  Business  Day, in each case
with the same force and effect as if made on such date fixed for redemption.  If
payment of the Redemption  Price is improperly  withheld or refused and not paid
by the Partnership, distributions on such Series X Preferred Units will continue
to accumulate from the original redemption date to the date of payment, in which
case the actual  payment date will be considered  the date fixed for  redemption
for purposes of calculating the applicable Redemption Price.

        Section 6. Voting Rights. (a) General. Holders of the Series X Preferred
Units  will not have any  voting  rights  or  right  to  consent  to any  matter
requiring the consent or approval of the Limited  Partners,  except as set forth
in Section 14.1 of the Partnership  Agreement and in this Section 6. (Solely for
purposes of Section 14.1 of the Partnership  Agreement,  each Series X Preferred
Unit shall be treated as one Partnership Unit.)

        (b)  Certain  Voting  Rights.  So long as any Series X  Preferred  Units
remain  outstanding,  the Partnership shall not, without the affirmative vote of
the holders of at least a majority of the Series X Preferred  Units  outstanding
at the time:  (i)  authorize  or create,  or increase the  authorized  or issued
amount of, any class or series of  Partnership  Interests  ranking senior to the
Series X Preferred Units with respect to payment of distributions or rights upon
liquidation,  dissolution or winding-up or reclassify any Partnership  Interests
into  any  such  Partnership  Interest,  or  create,   authorize  or  issue  any
obligations or security convertible into or evidencing the right to purchase any
such Partnership Interests (for this purpose, partnership interests that rank in
parity  with  the  Series  A, B and C  Preferred  Units  or  other  series  with
equivalent  parity,  shall not be  treated  as  ranking  senior to, and shall be
treated as in parity  with,  the Series X Preferred  Units and any other  series
that rank in parity  with the  Series X  Preferred  Units);  (ii)  designate  or
create,  or increase the  authorized or issued  amount of, any Parity  Preferred
Units or reclassify  any authorized  Partnership  Interests into any such Parity
Preferred  Units,  or create,  authorize  or issue any  obligations  or security
convertible  into or evidencing the right to purchase any such shares,  but only
to the extent  such Parity  Preferred  Units are issued to an  Affiliate  of the
Partnership  on terms that differ from the terms of any Parity  Preferred  Units
issued to the public or  non-Affiliates of the Partnership (for purposes of this
Section 6(b)(ii),  an issuance to the General Partner shall not be treated as an
issuance to an Affiliate of the  Partnership  to the extent the issuance of such
Partnership  Interests was to allow the General  Partner to issue  corresponding
preferred stock to persons who are not Affiliates); or (iii) either (A) exchange
shares, consolidate, merge into or with, or convey, transfer or lease its assets
substantially  as an entirety to, any  corporation or other entity or (B) amend,
alter or repeal the provisions of the Partnership Agreement,  whether by merger,
consolidation  or otherwise,  that would  adversely  affect the powers,  special
rights, preferences,  privileges or voting power of the Series X Preferred Units
or the holders thereof;  provided,  however, that with respect to the occurrence
of a share  exchange,  merger,  consolidation  or a sale or  lease of all of the
Partnership's  assets  as an  entirety,  so long as (1) the  Partnership  is the
surviving  entity and the Series X Preferred Units remain  outstanding  with the
terms thereof unchanged, or (2) the resulting, surviving or transferee entity is
a partnership,  limited liability company or other pass-through entity organized
under the laws of any state and  substitutes  the Series X  Preferred  Units for
other interests in such entity having substantially the same terms and rights as
the Series X Preferred Units,  including with respect to  distributions,  voting
rights  and  rights  upon  liquidation,  dissolution  or  winding-up,  then  the
occurrence  of any such  event  shall  not be deemed to  adversely  affect  such
rights,  privileges  or voting  powers of the  holders of the Series X Preferred
Units;  and  provided  further  that any  increase in the amount of  Partnership
Interests  or the  creation  or  issuance  of  any  other  class  or  series  of
Partnership Interests, in each case ranking (y) junior to the Series X Preferred
Units with respect to payment of  distributions  or the  distribution  of assets
upon liquidation,  dissolution or winding-up, or (z) on a parity to the Series X
Preferred Units with respect to payment of  distributions or the distribution of
assets  upon  liquidation,   dissolution  or  winding-up,  to  the  extent  such
Partnership  Interests  are not issued to an  Affiliate of the  Partnership  (an
issuance  to the  General  Partner  shall not be  treated as an  issuance  to an
Affiliate  of the  Partnership  to the extent the  issuance of such  Partnership
Interests  was to allow the  General  Partner to issue  corresponding  preferred
stock to persons who are not Affiliates of the Partnership)  such issuance shall
not be deemed to adversely affect such rights, preferences, privileges or voting
powers. Notwithstanding anything to the contrary contained in this Section 6, if
holders  of a  majority  of the  Series X  Preferred  Units do not  approve of a
proposed action by the Partnership  described in clause (iii) of the immediately
preceding sentence which, in the reasonable judgment of the Partnership, results
in the holders of Series X Preferred Units having  substantially  the same terms
and  rights  as  the  Series  X  Preferred  Units,  including  with  respect  to
distributions,  voting  rights  and  rights  upon  liquidation,  dissolution  or
winding-up, and the holders of a majority of the Series X Preferred Units do not
affirmatively  vote in favor of such proposed  action,  then the Partnership may
proceed  with such  proposed  action and the sole  remedy of the  holders of the
Series X Preferred Units shall be the acceleration of the exchange date relating
to the Series X Preferred Units, as set forth in Section 8 of this Amendment. In
the  event  of  any  conflict  between  the  provisions  of  Section  4.2 of the
Partnership  Agreement and the  provisions of this Section 6, the  provisions of
this Section 6 shall control.

        Section 7. Transfer Restrictions.  (a) The holders of Series X Preferred
Units shall be subject to all of the provisions of Section 11 of the Partnership
Agreement  as modified by this  Section 7. Subject to the consent of the General
Partner,  which shall not be  unreasonably  withheld  or  delayed,  the Series X
Preferred Units may be transferred to a maximum of five (5) persons.  At no time
shall the number of holders of the Series X Preferred Units exceed five.

        (b)  Notwithstanding  anything to the contrary in Section  7(a),  if any
holder of Series X Preferred  Units  concludes  based upon  results or projected
results  that  there  exists  (in the  reasonable  judgment  of such  holder) an
imminent and  substantial  risk that such holder's  interest in the  Partnership
represents  or will  represent  more than 20% of the total  profits  or  capital
interests in the Partnership  for a taxable year  (determined in accordance with
Treasury  Regulations  Section  1.731-2,  then such holder shall be permitted to
transfer  so much of its  Series  X  Preferred  Units as may be  appropriate  to
alleviate the risk of not satisfying such 20% limit.

        Section  8.  Exchange  Rights.  (a)  Right  to  Exchange.  (i)  Series X
Preferred  Units will be  exchangeable in whole (and not in part) at any time on
or after the tenth (10th) anniversary of the date of issuance,  at the option of
the Partnership or a majority of the holders  thereof  (acting as a whole),  for
authorized  but  previously  unissued  shares  of 8  7/8%  Series  X  Cumulative
Redeemable  Preferred  Stock of the  General  Partner  (the  "Series X Preferred
Stock") at an  exchange  rate of one share of Series X  Preferred  Stock for one
Series X Preferred Unit, subject to adjustment as described below (the "Series X
Exchange  Price");  provided  that the  Series X  Preferred  Units  will  become
exchangeable  at any  time,  in whole  (and not in  part),  at the  option  of a
majority  of the  holders of Series X  Preferred  Units  (acting as a whole) for
Series X Preferred  Stock if (x) at any time full  distributions  shall not have
been timely made on any Series X  Preferred  Unit with  respect to six (6) prior
quarterly distribution periods, whether or not consecutive;  provided,  however,
that a distribution  in respect of Series X Preferred  Units shall be considered
timely made if made within two (2) Business Days after the  applicable  Series X
Preferred  Units  Distribution  Payment Date if at the time of such late payment
there shall not be any prior quarterly  distribution periods in respect of which
full distributions were not timely made, (y) upon receipt by a holder or holders
of Series X  Preferred  Units of (1) notice from the  General  Partner  that the
General  Partner or a Subsidiary  of the General  Partner has taken the position
that the  Partnership  is,  or upon the  occurrence  of a  defined  event in the
immediate  future  will  be, a PTP and (2) an  opinion  rendered  by an  outside
nationally  recognized  independent counsel familiar with such matters addressed
to a holder or holders of Series X Preferred  Units,  that the Partnership is or
likely is, or upon the  occurrence of a defined  event in the  immediate  future
will be or likely  will be a PTP,  or (z) the  holders of the Series X Preferred
Units hold or will hold 20% or more of the profits and capital  interests of the
Partnership,  provided  further  that,  in the case of clause (z),  the Series X
Preferred Units will be exchangeable  only to the extent necessary to reduce the
holdings of the holders of the Series X Preferred  Units to less than 20% of the
capital and profits interests of the Partnership.

        In  addition to and not in  limitation  of the  foregoing,  the Series X
Preferred Units may be exchanged for Series X Preferred Stock, in whole (and not
in part),  at the option of the  holders of a majority of the Series X Preferred
Units (acting as a whole) prior to the tenth (10th)  anniversary of the issuance
date and  after  the  third  anniversary  thereof  if such  holder  of  Series X
Preferred Units shall deliver to the General Partner either (i) a private letter
ruling  addressed to such holder of Series X Preferred  Units or (ii) an opinion
of independent counsel reasonably acceptable to the General Partner based on the
enactment of temporary or final  Treasury  Regulations  or the  publication of a
Revenue  Ruling in either  case to the effect  that an  exchange of the Series X
Preferred  Units at such  earlier  time would not cause the  Series X  Preferred
Units to be  considered  "stock and  securities"  within the  meaning of section
351(e) of the  Internal  Revenue  Code of 1986,  as  amended  (the  "Code")  for
purposes of determining  whether the holder of such Series X Preferred  Units is
an  "investment  company"  under  section  721(b) of the Code if an  exchange is
permitted at such earlier date.

        In  addition to and not in  limitation  of the  foregoing,  the Series X
Preferred  Units may be  exchanged  in whole  (and not in part)  (regardless  of
whether  held by Salomon  Smith  Barney  Tax  Advantaged  Exchange  Fund II, LLC
("Subscriber")  at the  option of the  holders  of a  majority  of the  Series X
Preferred  Units  (acting as a whole) for Series X Preferred  Stock (but only if
the  exchange  in whole  may be  accomplished  consistently  with the  ownership
limitations  set forth  under  the  Article  IV of the  Charter  of the  General
Partner,  taking  into  account  exceptions  thereto)  if at any  time  (i)  the
Partnership or the General  Partner breach any of the covenants set forth in the
Tax  Representations  Certificate  delivered  in  connection  with  the  Private
Placement Purchase  Agreement,  dated as of September 7, 1999, among Subscriber,
the  Partnership  and the  General  Partner,  (ii)  the  Partnership  reasonably
determines  that the  assets and income of the  Partnership  for a taxable  year
after 1999 would not satisfy  the income and assets  tests of Section 856 of the
Code for such  taxable  year if the  Partnership  were a real estate  investment
trust within the meaning of the Code, (iii) under the circumstances described in
the  penultimate  sentence  of  Section  6(b),  or (iv) any  holder  of Series X
Preferred  Units shall deliver to the  Partnership and the Company an opinion of
independent  counsel  reasonably  acceptable  to the Company to the effect that,
based on the assets and income of the Partnership for a taxable year after 1999,
the Partnership  would not satisfy the income and assets tests of Section 856 of
the Code for such taxable year if the Partnership were a real estate  investment
trust  within the meaning of the Code,  and that in the case of each of (ii) and
(iv),  such failure would create a meaningful risk that a holder of the Series X
Preferred Units would fail to maintain qualification as a real estate investment
trust.

        (ii)  Notwithstanding  anything  to the  contrary  set forth in  Section
8(a)(i),  if an Exchange Notice (as  hereinafter  defined) has been delivered to
the General  Partner,  then the  General  Partner  may, at its option,  elect to
redeem  or cause  the  Partnership  to  redeem  all (but not a  portion)  of the
outstanding  Series  X  Preferred  Units  for  cash in an  amount  equal  to the
Liquidation  Preference  per Series X Preferred  Unit.  The General  Partner may
exercise its option to redeem the Series X Preferred  Units for cash pursuant to
this  Section  8(a)(ii)  by giving  each  holder of record of Series X Preferred
Units notice of its election to redeem for cash,  within five (5) Business  Days
after  receipt of the  Exchange  Notice,  by (m) fax, and (n)  registered  mail,
postage  paid at the  address of each  holder as it may appear on the records of
the Partnership  stating (A) the redemption  date,  which shall be no later than
sixty (60) days following the receipt of the Exchange Notice, (B) the redemption
price,  (C) the place or places  where the  Series X  Preferred  Units are to be
surrendered for payment of the redemption  price, (D) that  distributions on the
Series X Preferred Units will cease to accrue on such redemption  date; (E) that
payment of the redemption price will be made upon  presentation and surrender of
the Series X Preferred Units and (F) the aggregate  number of Series X Preferred
Units to be redeemed.

        (iii) If an  exchange of Series X  Preferred  Units  pursuant to Section
8(a)(i)  would  violate the  provisions  on ownership  limitation of the General
Partner  set forth in Article  IV of the  Charter of the  General  Partner  with
respect to the Series X Preferred  Stock the General  Partner shall give written
notice thereof to each holder of record of Series X Preferred Units, within five
(5) Business Days following  receipt of the Exchange Notice, by (m) fax, and (n)
registered mail,  postage prepaid,  at the address of each such holder set forth
in the  records  of the  Partnership.  In such  event,  each  holder of Series X
Preferred  Units shall be entitled to exchange,  pursuant to the  provisions  of
Section  8(b) a number of Series X Preferred  Units which would  comply with the
provisions on the ownership  limitation of the General Partner set forth in such
Article IV of the  Charter of the  General  Partner  and any Series X  Preferred
Units not so exchanged (the "Excess Units") shall be redeemed by the Partnership
for cash in an amount equal to the Liquidation Preference. The written notice of
the  General  Partner  shall  state (A) the number of Excess  Units held by such
holder, (B) the redemption price of the Excess Units, (C) the date on which such
Excess  Units  shall be  redeemed,  which date shall be no later than sixty (60)
days following the receipt of the Exchange Notice, (D) the place or places where
such Excess Units are to be surrendered for payment of the Redemption Price, (E)
that  distributions  on the Excess Units will cease to accrue on such redemption
date,  and  (F)  that  payment  of  the  redemption  price  will  be  made  upon
presentation  and surrender of such Excess Units. If an exchange would result in
Excess Units, as a condition to such exchange,  each holder of such units agrees
to provide  representations  and covenants  reasonably  requested by the General
Partner  relating to (1) the widely held nature of the interests in such holder,
sufficient to assure the General Partner that the holder's ownership of stock of
the General  Partner  (without  regard to the limits  described  above) will not
cause any Person (as such term is defined in the  Articles of  Incorporation  of
the General Partner) to own stock of the General Partner in an amount that would
cause such Person not to comply with the provisions of the ownership  limitation
of the  General  Partner  set  forth  in  such  Article  IV of the  Articles  of
Incorporation of the General  Partner;  and (2) to the extent such holder can so
represent  and  covenant  without  obtaining  information  from its owners,  the
holder's ownership of tenants of the Partnership and its affiliates.

        Notwithstanding  any  provision of this  Agreement to the  contrary,  no
Series X Limited  Partner  shall be  entitled  to effect an exchange of Series X
Preferred  Units for Series X Preferred  Stock to the extent that  ownership  or
right to acquire  such shares would cause the Partner or any other Person or, in
the opinion of counsel selected by the General Partner, may cause the Partner or
any other Person to violate the restrictions on ownership and transfer of Series
X Preferred Stock set forth in the Articles of Incorporation.  To the extent any
such  attempted  exchange for Series X Preferred  Stock would be in violation of
the  previous  sentence,  it shall be void ab initio  and such  Series X Limited
Partner  shall not  acquire  any  rights or  economic  interest  in the Series X
Preferred Stock otherwise issuable upon such exchange.

        (iv) The  redemption  of Series X Preferred  Units  described in Section
8(a)(ii)  and (iii) shall be subject to the  provisions  of Section  5(b)(i) and
Section 5(b)(ii);  provided,  however,  that the term "redemption price" in such
Section shall be read to mean the Liquidation  Preference per Series X Preferred
Unit being redeemed.

        (b) Procedure for Exchange. (i) Any exchange shall be exercised pursuant
to a notice of exchange (the "Exchange Notice") delivered to the General Partner
by the holder  who is  exercising  such  exchange  right,  by (a) fax and (b) by
certified mail postage prepaid.  The exchange of Series X Preferred Units may be
effected  after the fifth (5th)  Business Day  following  receipt by the General
Partner of the Exchange Notice by delivering  certificates if any,  representing
such Series X Preferred  Units to be exchanged  together  with,  if  applicable,
written  notice of exchange and a proper  assignment  of such Series X Preferred
Units  to the  office  of the  General  Partner  maintained  for  such  purpose.
Currently,  such  office is c/o PS Business  Parks,  Inc.,  701 Western  Avenue,
Glendale,  California 91201, Attention:  Jack E. Corrigan. Each exchange will be
deemed to have been effected  immediately  prior to the close of business on the
date on which such Series X Preferred  Units to be exchanged  (together with all
required  documentation)  shall have been surrendered and notice shall have been
received by the General  Partner as aforesaid and the Exchange  Price shall have
been paid. Any Series X Preferred  Stock issued pursuant to this Section 8 shall
be delivered as shares which are duly authorized, validly issued, fully paid and
nonassessable, free of pledge, lien, encumbrance or restriction other than those
provided in the Charter,  the Bylaws of the General Partner,  the Securities Act
of 1933, as amended and relevant state securities or blue sky laws.

        (ii) In the event of an exchange of Series X Preferred  Units for shares
of Series X Preferred  Stock, an amount equal to the accrued and unpaid Priority
Return,  whether  or not  declared,  to the  date of  exchange  on any  Series X
Preferred  Units  tendered  for  exchange  shall (a) accrue on the shares of the
Series X Preferred Stock into which such Series X Preferred Units are exchanged,
and (b) continue to accrue on such Series X Preferred Units,  which shall remain
outstanding  following such exchange,  with the General Partner as the holder of
such Series X Preferred  Units.  Notwithstanding  anything to the  contrary  set
forth herein,  in no event shall a holder of a Series X Preferred  Unit that was
validly  exchanged into Series X Preferred Stock pursuant to this section (other
than the General  Partner now holding such Series X Preferred  Unit),  receive a
distribution from the Partnership,  if such holder, after exchange,  is entitled
to receive a distribution  from the General Partner with respect to the share of
Series X Preferred Stock for which such Series X Preferred Unit was exchanged or
redeemed.

        (iii) Fractional shares of Series X Preferred Stock are not to be issued
upon  exchange  but,  in lieu  thereof,  the  General  Partner  will  pay a cash
adjustment  based upon the fair market value of the Series X Preferred  Stock on
the day prior to the exchange  date as  determined in good faith by the Board of
Directors of the General Partner.

        (c) Adjustment of Exchange  Price.  (i) The Exchange Price is subject to
adjustment upon certain events,  including,  (a) subdivisions,  combinations and
reclassification  of the Series X Preferred Stock, and (b)  distributions to all
holders of Series X Preferred  Stock of evidences of indebtedness of the General
Partner  or  assets   (including   securities,   but  excluding   dividends  and
distributions  paid in cash out of  equity  applicable  to  Series  X  Preferred
Stock).

        (ii) In case the  General  Partner  shall be a party to any  transaction
(including,  without  limitation,  a  merger,  consolidation,   statutory  share
exchange,  tender offer for all or  substantially  all of the General  Partner's
capital  stock  or sale of all or  substantially  all of the  General  Partner's
assets),  in each case as a result of which the Series X Preferred Stock will be
converted into the right to receive shares of capital stock, other securities or
other  property  (including  cash or any  combination  thereof),  each  Series X
Preferred  Unit will  thereafter  be  exchangeable  into the kind and  amount of
shares of capital stock and other securities and property receivable  (including
cash or any combination  thereof) upon the consummation of such transaction by a
holder of that number of shares of Series X Preferred Stock or fraction  thereof
into which one Series X Preferred  Unit was  exchangeable  immediately  prior to
such  transaction.  The  General  Partner  may not  become  a party  to any such
transaction  unless the terms thereof are consistent with the foregoing.  In the
event of a conflict  between the  provisions  of this  Section  8(c)(ii) and any
provision of the Partnership Agreement,  the provisions of this Section 8(c)(ii)
shall control.

        Section 9. No Conversion  Rights.  Except as set forth in Section 8, the
holders of the  Series X  Preferred  Units  shall not have any rights to convert
such units into  shares of any other  class or series of stock or into any other
securities of, or interest in, the Partnership.

        Section 10. No Sinking  Fund. No sinking fund shall be  established  for
the retirement or redemption of Series X Preferred Units.

        Section 11. Exhibit A to Partnership Agreement. In order to duly reflect
the  issuance  of  the  Series  X  Preferred  Units  provided  for  herein,  the
Partnership Agreement is hereby further amended pursuant to Section 12.3 thereof
by deleting Exhibit A thereto and replacing Exhibit A attached hereto therefor.

        Section 12. Inconsistent  Provisions.  Nothing to the contrary contained
in the  Partnership  Agreement  shall limit any of the rights or obligations set
forth in this Amendment.

        IN WITNESS WHEREOF this Amendment has been executed as of the date first
above written.

                                        PS BUSINESS PARKS, INC.

                                        By: /s/ Jack Corrigan
                                            ----------------------
                                            Jack Corrigan
                                            Vice President and
                                            Chief Financial Officer





                                                                   Exhibit 10.25


                             PS BUSINESS PARKS, L.P.

                        AMENDMENT TO AGREEMENT OF LIMITED
                             PARTNERSHIP RELATING TO
                ADDITIONAL 8 7/8% SERIES X CUMULATIVE REDEEMABLE
                                 PREFERRED UNITS

     This  Amendment  to the  Agreement  of Limited  Partnership  of PS Business
Parks, L.P. a California limited  partnership (the  "Partnership"),  dated as of
the 23rd day of  September,  1999 (this  "Amendment")  amends the  Agreement  of
Limited Partnership of the Partnership,  dated as of March 17, 1998 by and among
PS Business Parks, Inc. (the "General Partner") and each of the limited partners
executing a signature page thereto, as amended  (collectively,  the "Partnership
Agreement").  Capitalized terms used herein and not otherwise defined shall have
the  meanings  ascribed  to such  terms in the  Partnership  Agreement.  Section
references  are  (unless  otherwise  specified)  references  to sections in this
Amendment.

     WHEREAS,  pursuant  to Section  4.2(a) of the  Partnership  Agreement,  the
General  Partner  caused the  Partnership  to issue  1,200,000  8 7/8%  Series X
Cumulative  Redeemable  Preferred  Units  pursuant to that certain  Amendment to
Agreement  of  Limited  Partnership  Relating  to 8  7/8%  Series  X  Cumulative
Redeemable  Preferred  Units,  dated September 7, 1999 (the "Prior  Amendment"),
with the  designations,  preferences  and relative,  participating,  optional or
other special rights, powers and duties set forth therein;

     WHEREAS,  pursuant  to  Section  4.2(a) of the  Partnership  Agreement  the
General Partner desires to cause the  Partnership to issue  additional  Series X
Cumulative Redeemable Preferred Units, with the same designations, prefererences
and relative, participating, optional or other special rights, powers and duties
of the Series X Preferred Units set forth in the Prior Amendment;

     WHEREAS,  pursuant  to Section  4.2(a) of the  Partnership  Agreement,  the
General  Partner,  without the consent of the  Limited  Partners,  may amend the
Partnership  Agreement by executing a written instrument setting forth the terms
of such amendment; and

     WHEREAS,  the General  Partner  desires by this  Amendment  to so amend the
Partnership  Agreement  as of the date first set forth  above to provide for the
and issuance of additional Series X Preferred Units.

     NOW, THEREFORE, the Partnership Agreement is hereby amended as follows:

     Section 1.  Definitions.  Capitalized  terms not otherwise  defined  herein
shall have their respective meanings set forth in the Partnership  Agreement and
the Prior  Amendment.  For purposes of this Amendment,  Series X Preferred Units
shall mean those certain 8 7/8% Series X Cumulative  Redeemable  Preferred Units
issued on  September  7,  1999  together  with the  additional  8 7/8%  Series X
Cumulative Redeemable Preferred Units issued as of the date hereof.

     Section 2.  Number of Series X  Preferred  Units.  The  Partnership  hereby
increases  the number of Series X Preferred  Units by 400,000 (the "New Units"),
thereby  causing the total  number of Series X Preferred  Units to be  1,600,000
(the "Increased Series X Preferred Units"). All terms and conditions established
in the Prior  Amendment  relating  to the  Series X  Preferred  Units are hereby
ratified  and  confirmed  and shall  apply to the  Increased  Series X Preferred
Units.  Notwithstanding the foregoing or anything contained herein, the Priority
Return  distributions  relating to the New Units shall  accrue from the original
date of issuance of the New Units.

     Section 3. Exhibit A to Partnership Agreement. In order to duly reflect the
issuance of the New Units  provided  for herein,  the  Partnership  Agreement is
hereby further  amended  pursuant to Section 12.3 thereof by deleting  Exhibit A
thereto and replacing Exhibit A attached hereto therefor.

     Section 4. Inconsistent  Provisions.  Nothing to the contrary  contained in
the Partnership Agreement shall limit any of the rights or obligations set forth
in this Amendment.


<PAGE>

     IN WITNESS  WHEREOF this  Amendment  has been executed as of the date first
above written.


                                           PS BUSINESS PARKS, INC.

                                           By: /s/ Jack Corrigan
                                               -------------------------
                                               Jack Corrigan
                                               Vice President and
                                               Chief Financial Officer




                             PS BUSINESS PARKS, INC.
           Exhibit 11: Statement re: Computation of Earnings per Share

<TABLE>
<CAPTION>
                                                                 For the Three Months Ended       For the Nine Months Ended
                                                                        September 30,                  September 30,
                                                               -----------------------------  -----------------------------
                                                                   1999            1998            1999         1998
                                                               --------------  -------------  --------------  -------------
<S>                                                            <C>             <C>            <C>             <C>
Basic and Diluted Earnings Per Share:

Net income allocable to common shareholders.............        $  9,383,000   $   9,748,000   $  28,218,000  $  21,124,000
                                                               ==============  =============  ==============  =============
Weighted average common shares outstanding:
   Basic weighted average common shares outstanding.....          23,641,000      23,636,000      23,639,000     17,920,000
   Net effect of dilutive  stock  options - based on
     treasury stock method using average market price...              83,000          60,000          74,000         70,000
                                                               --------------  -------------  --------------  -------------
   Diluted weighted average common shares outstanding...          23,724,000      23,696,000      23,713,000     17,990,000
                                                               ==============  =============  ==============  =============

Basic earnings per common share.........................       $        0.40    $       0.41   $       1.19    $       1.18
                                                               ==============  =============  ==============  =============
Diluted earnings per common share.......................       $        0.40    $       0.41   $       1.19    $       1.17
                                                               ==============  =============  ==============  =============
</TABLE>

                                   Exhibit 11




                             PS BUSINESS PARKS, INC.
           Exhibit 12: Statement re: Computation of Ratio of Earnings
                                to Fixed Charges

<TABLE>
<CAPTION>
                                                                              Nine Months Ended
                                                                                September 30,
                                                                  ----------------------------------------
                                                                        1999                     1998
                                                                  ----------------        ----------------
      <S>                                                         <C>                     <C>

      Net income............................................       $   30,352,000          $   21,124,000
      Minority interest.....................................           10,769,000               8,696,000
      Interest expense......................................            2,658,000               1,736,000
                                                                  ----------------        ----------------
         Total earnings available to cover fixed charges....       $   43,779,000          $   31,556,000
                                                                  ================        ================

      Total fixed charges - interest expense (1)............       $    3,242,000          $    1,736,000
                                                                  ================        ================

      Total preferred distributions.........................       $    3,370,000          $            -
                                                                  ================        ================
      Total combined fixed charges and preferred
      distributions.........................................       $    6,612,000          $    1,736,000
                                                                  ================        ================

      Ratio of earnings to fixed charges....................                13.50                   18.18
                                                                  ================        ================

      Ratio of earnings to combined fixed charges and
      preferred distributions...............................                 6.62                   18.18
                                                                  ================        ================
</TABLE>

<TABLE>
<CAPTION>
                                                                   Years Ended December 31,
                                       --------------------------------------------------------------------------------
                                            1998             1997            1996             1995            1994
                                       --------------   --------------  --------------   --------------  --------------
<S>                                    <C>              <C>             <C>              <C>             <C>

Net income.........................     $ 29,400,000     $  3,836,000    $    519,000     $  1,192,000    $  1,245,000
Minority interest..................       11,208,000        8,566,000               -                -               -
Interest expense...................        2,361,000            1,000               -                -               -
                                       --------------   --------------  --------------   --------------  --------------
     Total earnings available to
       cover fixed charges.........     $ 42,969,000     $ 12,403,000    $    519,000     $  1,192,000    $  1,245,000
                                       ==============   ==============  ==============   ==============  ==============
Total fixed charges - interest
   expense (1).....................     $  2,629,000     $      1,000    $          -     $          -    $          -
                                       ==============   ==============  ==============   ==============  ==============

Ratio of earnings to fixed charges.            16.34           12,403          N/A              N/A             N/A
                                       ==============   ==============  ==============   ==============  ==============
</TABLE>
_______________

(1) Fixed charges include interest expense plus capitalized interest.

                                   Exhibit 12


<PAGE>

                             PS BUSINESS PARKS, INC.
           Exhibit 12: Statement re: Computation of Ratio of Earnings
                                to Fixed Charges

Supplemental disclosure of Ratio of Funds from Operations ("FFO") to fixed
charges:

<TABLE>
<CAPTION>
                                                                              Nine Months Ended
                                                                                September 30,
                                                                  ----------------------------------------
                                                                        1999                     1998
                                                                  ----------------        ----------------
      <S>                                                         <C>                     <C>

      FFO...................................................       $   56,848,000          $   40,317,000
      Interest expense......................................            2,658,000               1,736,000
      Minority interest in income - preferred units.........            1,236,000                       -
      Preferred dividends...................................            2,134,000                       -
                                                                  ----------------        ----------------
         Adjusted FFO available to cover fixed charges......       $   62,876,000          $   42,053,000
                                                                  ================        ================

      Total fixed charges - interest expense (1)............       $    3,242,000          $    1,736,000
                                                                  ================        ================

      Total preferred distributions.........................       $    3,370,000          $            -
                                                                  ================        ================
      Total combined fixed charges and preferred
      distributions.........................................       $    6,612,000          $    1,736,000
                                                                  ================        ================

      Ratio of FFO to fixed charges.........................                19.39                   24.22
                                                                  ================        ================
      Ratio of FFO to combined fixed charges and preferred
      distributions.........................................                 9.51                   24.22
                                                                  ================        ================
</TABLE>

<TABLE>
<CAPTION>
                                                                   Years Ended December 31,
                                       --------------------------------------------------------------------------------
                                            1998             1997            1996             1995            1994
                                       --------------   --------------  --------------   --------------  --------------
<S>                                    <C>              <C>             <C>              <C>             <C>

FFO................................     $ 57,430,000     $ 17,597,000    $    303,000     $    720,000    $    757,000
Interest expense...................        2,361,000            1,000               -                -               -
                                       --------------   --------------  --------------   --------------  --------------
Adjusted FFO available to cover
   fixed charges...................     $ 59,791,000     $ 17,598,000    $    303,000     $    720,000    $    757,000
                                       ==============   ==============  ==============   ==============  ==============
Total fixed charges - interest
   expense (1).....................     $  2,629,000     $      1,000    $          -     $          -    $          -
                                       ==============   ==============  ==============   ==============  ==============

Ratio of FFO to fixed charges......            22.74           17,598          N/A              N/A             N/A
                                       ==============   ==============  ==============   ==============  ==============
</TABLE>


(1) Fixed charges include interest expense plus capitalized interest.

                                   Exhibit 12



<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>



                             PS BUSINESS PARKS. INC.
                      EXHIBIT 27 - FINANCIAL DATA SCHEDULE
                           ARTICLE 5 OF REGULATION S-X

</LEGEND>
       <CIK>                                                0000866368
       <NAME>                                  PS Business Parks, Inc.
       <MULTIPLIER>                                                  1
       <CURRENCY>                                               U.S. $

       <S>                                                         <C>
       <PERIOD-TYPE>                                             9-MOS
       <FISCAL-YEAR-END>                                   DEC-31-1999
       <PERIOD-START>                                      JAN-01-1999
       <PERIOD-END>                                        SEP-30-1999
       <EXCHANGE-RATE>                                               1
       <CASH>                                              118,988,000
       <SECURITIES>                                                  0
       <RECEIVABLES>                                                 0
       <ALLOWANCES>                                                  0
       <INVENTORY>                                                   0
       <CURRENT-ASSETS>                                    118,988,000
       <PP&E>                                              815,937,000
       <DEPRECIATION>                                     (43,932,000)
       <TOTAL-ASSETS>                                      906,387,000
       <CURRENT-LIABILITIES>                                19,210,000
       <BONDS>                                                       0
                                                0
                                                 55,000,000
       <COMMON>                                                236,000
       <OTHER-SE>                                          497,153,000
       <TOTAL-LIABILITY-AND-EQUITY>                        906,387,000
       <SALES>                                                       0
       <TOTAL-REVENUES>                                     93,780,000
       <CGS>                                                         0
       <TOTAL-COSTS>                                        26,021,000
       <OTHER-EXPENSES>                                     23,980,000
       <LOSS-PROVISION>                                              0
       <INTEREST-EXPENSE>                                    2,658,000
       <INCOME-PRETAX>                                      30,352,000
       <INCOME-TAX>                                                  0
       <INCOME-CONTINUING>                                  30,352,000
       <DISCONTINUED>                                                0
       <EXTRAORDINARY>                                               0
       <CHANGES>                                                     0
       <NET-INCOME>                                         30,352,000
       <EPS-BASIC>                                              1.19
       <EPS-DILUTED>                                              1.19




</TABLE>


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