Corporate Office Properties Trust Schedules Dedication of 'Dihedrals' Sculpture for September 25.

Business Editors

COLUMBIA, Md.--(BUSINESS WIRE)--Sept. 18, 2002

Company's Latest Piece of Artwork, Designed by Rob Fisher, is

Positioned Outside One Gateway Exchange Building in Columbia

Corporate Office Properties Trust (NYSE:OFC), the largest owner of suburban office properties in the Baltimore/Washington Corridor, will hold dedication ceremonies on Wednesday, September 25th at 6:30 p.m. for "Dihedrals," a new thirty-five foot tall sculpture.

The piece is positioned outside One Gateway Exchange, a five-story, 125,000 square foot Class A office building located at the Columbia Gateway business community in Columbia, MD near MD Route 175 and Interstate 95. Pennsylvania-based artist Rob Fisher, who designed and created the artwork, and Howard County Executive James Robey, will participate in the evening festivities.

The building is part of Corporate Office Properties' fifteen-building portfolio at Columbia Gateway, comprising more than one million square feet of space. The Company also owns a contiguous 9.6 acre site that can support two additional 125,000 square foot buildings.

"Dihedrals" is positioned in the traffic circle area that will service, upon completion of construction, these three Class A office buildings.

"Dihedrals" is composed of four separate masts, connected by three large wing-like forms that appear to be taking off in formation. The metallic gold feathers, which comprise these forms, consist of more than 5,500 parts fabricated from sheets of perforated aluminum.

The sculpture's name, inspired by Rob Fisher's wife, True, is an aeronautical term that refers to the upward or downward angle created by two adjoining planes found on the wings of a bird or an aircraft. The materials used to create "Dihedrals" were gathered from facilities throughout the country.

"This is Corporate Office Properties' second original exterior sculpture - joining the acclaimed `Trinity' at The National Business Park - which reflects our commitment to creating outstanding business park environments," stated Randall M. Griffin, President and Chief Operating Officer of Corporate Office Properties Trust. "In addition to serving as a landmark feature at Columbia Gateway, we believe this piece is a gift to our tenants and the citizens of Howard County," he added.

"The geometry of the wings, along with the precise arrangement of the masts, will create a natural symmetry with the three office buildings," explained Rob Fisher. "Our challenge was to produce a dramatic piece that not only complements the single-building that currently exists, but one that will serve as an icon for the three buildings in the future. The head-on view of `Dihedrals," seen as one approaches the site, provides the most dense and powerful perspective, with its stark procession of the wings. Viewed from the side, the large wings appear to delicately float within the framework of the masts," he added.

In addition to these two original sculptures, the Company purchased seven "Fish out of Water" pieces, which were part of the collection of 180 finned creatures that graced buildings and places of interest in downtown Baltimore City last year. These fish are now displayed at Corporate Office Properties projects throughout Anne Arundel and Howard Counties.

Company Information

Corporate Office Properties Trust is a fully-integrated, self-managed real estate investment trust which focuses on the ownership, management, leasing, acquisition and development of suburban office properties located in select Mid-Atlantic submarkets. The Company currently owns 110 office properties totaling 8.9 million rentable square feet.

Corporate Development Services, the Company's development company, provides a wide range of development and construction management services. In addition, Corporate Office Services provides land planning, design/build services, consulting and merchant development to third party entities.

The Company's shares are traded on the New York Stock Exchange under the symbol OFC. More information on Corporate Office Properties Trust can be found on the Internet at www.copt.com.

Forward-Looking Information

This press release contains forward-looking information based upon the Company's current best judgment and expectations. Actual results could vary from those presented herein.

The risks and uncertainties associated with the forward-looking information include the strength of the commercial office real estate market in which the Company operates, competitive market conditions, general economic growth, interest rates and capital market conditions. For further information, please refer to the Company's filings with the Securities and Exchange Commission.

Website www.copt.com