Exhibit 10.4

                              EMPLOYMENT AGREEMENT

     PS Business Parks, Inc., a California Corporation  (hereinafter referred to
as  "Employer")  and J.  Michael  Lynch,  a  resident  of the State of  Maryland
(hereinafter referred to as "Employee"), in consideration of the mutual promises
hereinafter set forth, agree as follows:



                                   ARTICLE 1.

                             EMPLOYMENT OF EMPLOYEE

     1.1 SPECIFIED PERIOD:  Employer hereby employs Employee and Employee hereby
accepts employment with Employer for a period of one (1) year beginning the date
last stated below, such period being referred to as the "Employment Term."



                                   ARTICLE 2.

                        EMPLOYEE'S DUTIES AND OBLIGATIONS

     2.1 GENERAL  DUTIES:  Employee shall serve as Vice  President,  Director of
Acquisitions/Development of Employer subject to the direction and control of the
Employer's  Chief  Executive  Officer and Board of Directors.  Employee shall be
based at the Employer's  headquarters,  currently 701 Western Avenue, Suite 200,
Glendale, CA 91201, as such may be changed from time to time.

     2.2 DEVOTION TO EMPLOYER'S BUSINESS:

          2.2.1 Employee shall devote, during the term of this Agreement, all or
     substantially  all of his professional  time,  ability and attention to the
     business  of  Employer   as  is   necessary   to  perform  his  duties  and
     responsibilities  inherent  in his  position in a prudent,  reasonable  and
     businesslike manner.

          2.2.2 This  Agreement,  during its term,  shall not be  interpreted to
     prohibit Employee from making passive personal  investments,  provided that
     such investments do not materially interfere with the Employee's duties and
     services  required by this  Agreement,  including,  but not limited to, the
     competitive provisions of SECTION 2.3 hereof.

     2.3 COMPETITIVE ACTIVITIES:

          2.3.1 Without the consent in writing of employer,  Employee shall not,
     during the term of his  employment  engage in activities  that compete with
     Employer or its affiliate.





          2.3.2  If a court  or  other  authority  having  jurisdiction  thereof
     determines  that the  foregoing  competitive  restriction  is too  broad or
     otherwise unreasonable under applicable law, including with respect to time
     or space,  the court is hereby  requested,  directed and  authorized by the
     parties  hereto to revise the foregoing  restriction to include the maximum
     restriction allowed under the applicable law. The Employee expressly agrees
     that  his  breach  of  the  provisions  of  SECTION  2.3  would  result  in
     irreparable  injuries  to  Employer,  that the  remedy  at law for any such
     breach  will be  inadequate  and  that  upon  breach  of this  SECTION  2.3
     Employer, in addition to all other available remedies, shall be entitled as
     a  matter  of  right  to  injunctive  relief  in  any  court  of  competent
     jurisdiction.

          2.3.3.  Nothing herein shall prevent or prohibit the Employee,  during
     his Employment,  from owning less than five percent (5%) of the outstanding
     debt or equity  securities  of (i) any  corporation  whose  securities  are
     listed on any national securities exchange or on the Nasdaq Stock Market or
     (ii) any mutual fund or co-mingled  investment  entity registered under the
     Investment Company Act.



                                   ARTICLE 3.

                             OBLIGATIONS OF EMPLOYER

     3.1 GENERAL  PROVISION:  Employer  shall provide  Employee with the salary.
Incentives and benefits specified in this Agreement and in Exhibit A.

     3.2 OFFICE AND  STAFF:  Employer  shall  provide  Employee  with an office,
secretarial  support,  office  equipment,  supplies  and  other  facilities  and
services  reasonably  suitable  to  Employee's  position  and  adequate  for the
performance of his duties.

     3.3 INDEMNIFICATION:

          3.3.1  To the  fullest  extent  permitted  by law,  Employee  shall be
     indemnified  and held  harmless  by  Employer  from and against any and all
     losses,  claims,  damages,   liabilities  (joint  and  several),   expenses
     (including reasonable legal fees and expenses),  costs, charges, judgments,
     fines,  settlements  and other  amounts  arising  from any and all  claims,
     demands,  actions,  suits or proceedings in which Employee may be involved,
     or  threatened  to be  involved,  as a party  or  otherwise  by  reason  of
     Employee's status as an employee,  officer or consultant of Employer if (a)
     Employee  acted in good faith and in a manner he in good faith  believed to
     be in, or not opposed to, the best interests of Employer, and, with respect
     to any criminal proceedings, had no reasonable cause to believe his conduct
     was  unlawful,   and  (b)  Employee's  conduct  did  not  constitute  gross
     negligence or willful or wanton misconduct.  The termination of any action,
     suit or proceeding  by judgment,  order,  settlement,  conviction or upon a
     plea of nolo contendere, or its equivalent,  shall not, of itself, create a
     presumption  that Employee acted in a manner  contrary to that specified in
     CLAUSE 3.3.1(a) or CLAUSE 3.3.1 (b) above.





          3.3.2 To the fullest  extent  permitted  by law,  reasonable  expenses
     (including  legal fees and expenses)  incurred by Employee in defending any
     claim,  demand,  action,  suit or proceeding  shall be advanced by Employer
     prior to the final  disposition  of such  claim,  demand,  action,  suit or
     proceeding  upon  receipt by  Employer  of a written  undertaking  by or on
     behalf of  Employee  to repay such  amount if it shall be  determined  that
     Employee is not entitled to be indemnified as authorized in this Section.

          3.3.3  The  indemnification  provided  by  this  Section  shall  be in
     addition to any other  rights  which  Employee  may be  entitled  under any
     agreement, as a matter of law or otherwise, both as to action in Employee's
     capacity  as an  employee or  consultant  of Employer  and to action in any
     other capacity.



                                   ARTICLE 4.

                            COMPENSATION TO EMPLOYEE

     4.1 BASE  SALARY:  As base  compensation  for the  services to be performed
hereunder,  Employee  shall  receive a base  annual  salary of One  hundred  and
Forty-Five  Thousand  Dollars  ($145,000)  commencing as of the date  Employee's
employment  begins as  specified  in SECTION  1.1 of this  Agreement.  Such base
salary shall be paid pursuant to the general  payroll  practices of Employer and
shall  be  subject  to  increase  from  time to time,  in the sole and  absolute
discretion of Employer.

     4.2 ANNUAL BONUS:

          4.2.1 For each year, or part thereof,  of his employment Employee will
     be considered for receipt of an annual bonus. The payment and amount of the
     bonus shall be  determined  solely by  Employer,  in its sole and  absolute
     discretion.  At the discretion of the Chief Executive  Officer of Employer,
     Employee  shall be paid an  annual  bonus of up to Fifty  Thousand  Dollars
     ($50,000) based on satisfaction of goals and objectives to be determined by
     the Chief Executive Officer.

          4.2.2 If this Agreement is terminated by Employer for cause,  Employee
     shall not be entitled to an annual  bonus for the fiscal year in which that
     termination occurs.

          4.2.3  TAX  WITHHOLDING:  Employer  shall  have the right to deduct or
     withhold from the compensation  due to Employee  hereunder any and all sums
     required for federal,  state, local and foreign income tax, Social Security
     taxes,  unemployment  insurance taxes, state compensation fund charges, and
     all other federal, state, local and foreign taxes, assessments and charges,
     as the case  may be,  now  applicable  or that may be  enacted  and  become
     applicable in the future.






                                   ARTICLE 5.

                                EMPLOYEE BENEFITS

     5.1 VACATION,  ILLNESS,  LIFE INSURANCE AND OTHER BENEFITS:  Employer shall
provide  Employee with vacation and illness time off,  life  insurance,  medical
insurance  covering  Employee and his  immediate  family,  and such other fringe
benefits as are  customarily  made  available  to  employees  of like status and
tenure  employed by Employer.  Employee has been  provided a copy of  Employer's
"benefits package",  which he has read and understands as the benefits that will
be  available  to him.  Further,  Employer  reserves  the right to  change  such
benefits package.

     5.2  STOCK  OPTIONS:   Employee  has  read  Employer's  stock  options  and
understands its terms and conditions.



                                   ARTICLE 6.

                                BUSINESS EXPENSES

     6.1 BUSINESS EXPENSES:

          6.1.1  Employer  shall   reimburse   Employee  for  all  expenses  and
     disbursements  reasonably  incurred  by  Employee  in  the  performance  of
     Employee's duties for Employer during the Employment Term.

          6.1.2 Each such  expenditure  shall be  reimbursable  only if Employee
     furnishes to Employer  reasonable  and adequate  written  records and other
     documentary  evidence in accordance  with Employer's  policies  established
     from  time  to  time  and as  requested  by  federal  and  state  law,  and
     regulations  issued  by  the  appropriate  taxing   authorities,   for  the
     substantiation of each such expenditure as an income tax deduction.



                                   ARTICLE 7.

                            TERMINATION OF EMPLOYMENT

     7.1 TERMINATION FOR CAUSE:

          7.1.1 Employer  reserves the right to terminate this Agreement if: (i)
     Employee  is  convicted  or pleads nolo  contendere  to a felony or a crime
     involving moral turpitude; (ii) Employee fails to perform Employee's duties
     as specified in the Agreement and fails to cure said failure within 15 days
     after written  notice from  Employer;  or (iii)  Employee  commits fraud or
     theft against the Employer.





          7.1.2 Subject to the notice and cure period set forth in SECTION 7.1.1
     above,  Employer may at its option terminate this Agreement for the reasons
     stated in this Section by giving  written notice of termination to Employee
     without  prejudice  to any other  remedy to which  Employer may be entitled
     either at law, in equity or under this Agreement.

          7.1.3  Termination  under this  SECTION 7.1 shall be  considered  "for
     cause" for the purposes of this Agreement.

          7.1.4 In the event the  Employee's  employment is terminated for cause
     pursuant  to  SECTION  7.1.1 the  Employer  shall pay to the  Employee  the
     compensation,  benefits and reimbursement of reasonable  expenses otherwise
     payable  to him as  otherwise  would  have been  payable  pursuant  to this
     Agreement  through the last day of his actual  employment  by the Employer.
     The Employer  shall have no further  obligations  to the Employee,  and the
     Employee  shall  have no further  rights,  including,  without  limitation,
     rights to any compensation, whatsoever under this Agreement.

     7.2 EFFECT OF MERGER, TRANSFER OF ASSETS OR DISSOLUTION:

          7.2.1 This Agreement  shall  terminate by any voluntary or involuntary
     dissolution of Employer  resulting from either a merger or consolidation in
     which  Employer  is not  the  consolidated  or  surviving  corporation,  or
     transfer of all or substantially  all of the assets of Employer;  provided,
     however,  that this Section  shall not apply in the case of any such merger
     or  consolidation  approved  in writing by the Chief  Executive  Officer of
     Employer and in which the  surviving  or  consolidated  entity  assumes the
     obligations of Employer under this Agreement.  7.2.2 Termination under this
     Section  shall not be  considered  "for  cause"  for the  purposes  of this
     Agreement.  In the event that the Employee is  terminated  pursuant to this
     Section,  Employee shall be entitled to the same severance as if terminated
     without  cause and,  in  addition,  all  options  on stock of the  Employer
     granted to Employee in respect of his employment  which have not vested and
     become  exercisable shall become  exercisable at the time of closing of the
     transaction  which  terminates  this  Agreement  pursuant to section  7.2.1
     above.

     7.3 TERMINATION BY EMPLOYER WITHOUT CAUSE:

          7.3.1 Notwithstanding any provision of this Agreement to the contrary,
     if Employer  terminates  this  Agreement  without cause during its term (i)
     Employer shall immediately pay Employee's annual salary and fringe benefits
     and  reimburse  Employee  for  expenses  in each case as set forth  herein,
     earned  or   reimbursable   and  unpaid   through  the  effective  date  of
     termination, and (ii), on the effective date of such termination,  Employer
     shall also pay Employee, in a lump sum, the present value of the Employee's
     annual  salary  (based on the base salary  being  earned at the time of the
     notice of  termination)  for the remainder of the Employment  Term as would
     otherwise be payable (based on a discount rate of 5%), but in no event will
     the payment under this (ii) be less than $72,500.00.





     7.4  TERMINATION  BY  EMPLOYEE  WITH  CAUSE:  Employee  may  terminate  his
obligations  under this  Agreement  with cause after  fifteen (15) days' written
notice to Employer fully and accurately describing the cause for termination and
Employer  fails to cure the breach  within such  fifteen  (15) day period.  With
"cause"  shall mean a material and  continuing  breach by Employer in failing to
pay to Employee  amounts to which Employee is entitled under this Agreement.  In
the event Employee  terminates  this Agreement  pursuant to this Section 7.4 (i)
Employer shall  immediately pay employee's annual salary and fringe benefits and
reimburse  Employee  for  expenses in each case as set forth  herein,  earned or
reimbursable and unpaid through the effective date of termination,  and (ii), on
the effective date of such termination,  Employer shall also pay Employee,  in a
lump sum of` the present  value of the  Employee's  annual  salary (based on the
base salary being at the time of the notice of termination) for the remainder of
the Employment  Term as would  otherwise be payable (based on a discount rate of
5%), but in no event less than $145,000.00.



                                   ARTICLE 8.

                               GENERAL PROVISIONS

     8.1 NOTICES: Any notices to be given hereunder by either party to the other
may be effected by personal  delivery in writing or by  registered  or certified
mail,  postage prepaid with return receipt requested,  by nationally  recognized
overnight  courier or by  confirmed  facsimile  at the  following  addresses  or
facsimile numbers:

             If to Employee:           J. Michael Lynch
                                       356 Homeland Southway
                                       Baltimore, MD  21212





             If to Employer:           PS Business Parks, Inc.
                                       701 Western Avenue, Suite 200
                                       Glendale, CA  91201
                                       Facsimile:  (818) 244-9267
                                       Attn:  Office of General Counsel

     Notices  delivered  personally  shall be deemed  communicated  upon  actual
receipt;  mailed  notices  shall be  deemed  communicated  upon  receipt  of the
mailing;  notices sent by overnight  courier  shall be deemed  communicated  and
received as of one (1) business day after delivery to the overnight courier; and
notices sent by facsimile  shall be deemed  communicated  and received as of the
time the sender receives written confirmation of the sending of the facsimile.





     8.2 ATTORNEYS'  FEES AND COSTS: If any action in law or equity is necessary
to enforce or interpret the terms of this Agreement,  the  non-prevailing  party
shall pay the  reasonable  attorneys'  fees and costs of the  prevailing  party,
unless  otherwise  provided  by law or  this  Agreement.  A party  shall  not be
considered a prevailing party unless he or it prevails in  substantially  all of
his or its position under dispute.

     8.3 PARTIAL  INVALIDITY:  If any  provision of this  Agreement is held by a
court of  competent  jurisdiction  to be  invalid,  void or  unenforceable,  the
remaining  provisions  shall  nevertheless  continue in full force without being
impaired or invalidated.

     8.4 APPLICABLE  LAW: This  Agreement  shall be governed by and construed in
accordance  with the laws of the State of  California  as now enacted and as may
hereafter be modified and/or amended.

     8.5  CONSTRUCTION  OF TERMS:  The terms and  provisions of this  Agreement,
which are freely  negotiated  as between  the  parties,  shall not be  construed
either in favor of or  against  either  party in the event of any  ambiguity  or
uncertainty.

     8.6 EMPLOYEE'S  CONSULTATION WITH INDEPENDENT ATTORNEY:  Employee expressly
acknowledges  that Employee has been requested to consult with independent legal
counsel of  Employee's  choosing to review and have  explained  to Employee  the
legal  significance  and  legal  effect  of the  terms  and  conditions  of this
Agreement  prior to  Employee's  execution  of this  Agreement.  In this regard,
Employee expressly acknowledges that the terms of this Agreement were not forced
upon Employee by Employer,  and that the terms of this Agreement were negotiable
and were not  "cast  in  stone,"  and that  Employer  has not  imposed  any time
deadlines upon Employee with regard to the execution of this Agreement.

     8.7  ENTIRE  AGREEMENT:   This  Agreement  supersedes  any  and  all  other
agreements,  either oral or in writing, between the parties with respect to that
employment in any manner whatsoever.  Each party to this Agreement  acknowledges
that  no  representations,   inducements,  promises  or  agreements,  orally  or
otherwise, have been made by any party, or anyone acting on behalf of any party,
which are not embodied herein, and that no other agreement, statement or promise
not contained in this Agreement shall be valid or binding.

     8.8  MODIFICATIONS:  Any  modification  of this Agreement will be effective
only if it is in writing and signed by the party to be charged.

     8.9 WAIVER: A waiver of any of the terms and conditions hereof shall not be
construed as a general waiver of the same or any other term or condition  hereof
or any subsequent breach thereof.





     8.10  DISPUTE  RESOLUTION:  Any  controversy  or claim  arising  out of, or
relating to, this  Agreement or Employee's  employment  with  Employer  shall be
settled by arbitration in Los Angeles,  California in accordance  with the rules
of the  American  Arbitration  Association  then  existing,  and judgment on the
arbitration  award may be  entered  in any court  having  jurisdiction  over the
subject matter of the  controversy.  Employer and Employee agree to the personal
jurisdiction of any court of competent subject matter jurisdiction in the County
of Los Angeles for the enforcement of any order or judgment related hereto.  The
decision of the  arbitrator  shall be final and binding upon both  parties.  The
prevailing party in any arbitration  shall be entitled to its costs and expenses
(including   reasonable   attorney's  fees)  incurred  in  connection  with  the
arbitration  from the other  party.  No  punitive  or  exemplary  damages may be
awarded by the arbitrator. The foregoing provisions of this Section shall not be
interpreted to restrict either party's right to pursue  equitable  relief from a
court of competent jurisdiction.

     8.11 WAIVER OF JURY TRIAL:  BY AGREEING TO  ARBITRATE,  ALL  PARTIES,  AS A
PRACTICAL MATTER,  HAVE WAIVED THE RIGHT TO JURY TRIAL. The parties hereby waive
trial by jury in any action,  proceeding or counterclaim  brought by any of them
against any other party on any matters  whatsoever  arising out of or in any way
connected  with this  Agreement,  provided  that all actions  brought under this
Agreement shall be brought in the State of California.

     WHEREFORE,  the parties hereby execute this Agreement this 20th day of May,
1998.


                                    EMPLOYER:

                                    PS BUSINESS PARKS, INC.


                                    By:  /s/ Ronald L. Havner, Jr.
                                         -------------------------
                                         Ronald L. Havner, Jr.
                                         President and CEO





                                    EMPLOYEE:


                                    /s/ J. Michael Lynch
                                    --------------------
                                    J. MICHAEL LYNCH





                                    EXHIBIT A

                            EMPLOYMENT AGREEMENT FOR
                                J. MICHAEL LYNCH


1.   40,000 shares of the Company  common stock options with a "strike price" of
     $23.50 each, vesting 1/3 for each of the first 3 years of employment.

2.   A  $30,000  signing  bonus  payable  at the  end of the  first  30  days of
     employment.

3.   A moving  allowance of up to $20,000 to pay for all costs,  incurred  after
     the effective date of this agreement, related to relocating to Los Angeles,
     including,  but not limited to moving  household  effects,  transporting an
     automobile,  house  hunting  trips and the final trip to  transport  family
     members to Los Angeles.

4.   Participation in the Company's profit sharing program.

5.   An automobile  estimated usage allowance intended to reimburse employee for
     use of his business automobile usage.