News Release                                                        Exhibit 99.1
PS Business Parks, Inc.
701 Western Avenue
P.O. Box 25050
Glendale, CA  91221-5050
www.psbusinessparks.com

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                                 For Release:           Immediately
                                 Date:                  December 27, 2001
                                 Contact:               Mr. Jack Corrigan
                                                        (818) 244-8080, Ext. 663


PS Business Parks, INC. announces the acquisition of a business park.

Glendale,  California  - PS  Business  Parks,  Inc.  (AMEX:  PSB)  acquired  the
well-established business park known as Metro Park North in Rockville,  Maryland
at a cost of  approximately  $127 million on December 27, 2001. The  acquisition
was funded with the Company's existing cash and cash equivalents, line of credit
proceeds of $40 million and short-term  borrowings of approximately $35 million.
The park consists of 17 buildings  (903,000  square feet)  including nine office
buildings  (692,000 square feet) and eight flex-space  buildings (211,000 square
feet).

The Park is located in the I-270 corridor which contains major concentrations of
Federal  Government  Agencies  including the National  Institutes of Health, the
Food and Drug  Administration,  the  Department  of Health  and Human  Services,
Department of Energy and major private employers including IBM, Lockheed Martin,
Host Marriott and Hughes Network Systems. The Park is approximately 95% occupied
with 10% of the square footage  expiring  through December 31, 2002. The largest
tenant is the U.S. Government,  which occupies 224,000 square feet or 25% of the
Park.

This  acquisition  gives the  Company a presence in the  prestigious  Rockville,
Maryland  submarket  and  significantly  increases  its overall  presence in the
Maryland/Northern  Virginia market to approximately 4.4 million square feet. The
acquisition  increases  the  Company's  total  square  footage  to 14.8  million
rentable square feet. The Company will continue to apply a disciplined  approach
to its  acquisition  program while seeking  additional  acquisitions in this and
other markets across the country.

Company Information
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PSB is a  self-advised  and  self-managed  equity real estate  investment  trust
specializing  in  the  ownership,  management,   acquisition,   development  and
redevelopment of business parks containing  principally office "flex" space. The
Company defines "flex" space as buildings that are configured with a combination
of office and  warehouse  space and can be designed  to fit an almost  limitless
number  of  uses  (including  office,  assembly,  showroom,   laboratory,  light
manufacturing  and warehouse  under one roof).  As of December 27, 2001, PSB had
interests  in   approximately   14.8  million  net  rentable  square  feet  with
approximately  3,500 customers  located in 9 states,  concentrated  primarily in
California (4,672,000 sq. ft.), Texas (2,983,000 sq. ft.), Oregon (1,973,000 sq.
ft.),Virginia (2,621,000 sq. ft.) and Maryland (1,769,000 sq. ft.).

Additional  information  about PS  Business  Parks,  Inc.  is  available  on the
Internet.     The    Company's    web    site    is     www.psbusinessparks.com.
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Forward-Looking Statements
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When  used  within  this  press  release,   the  words  "expects,"   "believes,"
"anticipates,"  "should,"  "estimates," and similar  expressions are intended to
identify "forward-looking  statements." Such forward-looking  statements involve
known and unknown risks,  uncertainties,  and other factors, which may cause the
actual results and  performance  of the Company to be materially  different from
those  expressed  or implied in the  forward-looking  statements.  Such  factors
include the impact of competition  from new and existing  commercial  facilities
which could impact rents and occupancy levels at the Company's  facilities,  the
Company's  ability to evaluate,  finance,  and integrate  acquired and developed
properties  into the Company's  existing  operations;  the Company's  ability to
effectively  compete in the markets that it does  business in; the impact of the
regulatory  environment  as  well  as  national,   state,  and  local  laws  and
regulations   including,   without  limitation,   those  governing  Real  Estate
Investment Trusts;  the impact of general economic  conditions upon rental rates
and occupancy levels at the Company's facilities;  the availability of permanent
capital at  attractive  rates,  the outlook and actions of Rating  Agencies  and
risks  detailed  from  time to  time in the  Company's  SEC  reports,  including
quarterly  reports on Form 10-Q,  reports on Form 8-K and annual reports on Form
10-K.