PRESS RELEASE DETAIL


Jan 18, 2008

Christopher Nassetta, Host Marriott CEO, Joins CoStar Group Board of Directors

2002-06-18 2002 Christopher Nassetta, Host Marriott CEO, Joins CoStar Group Board of Directors

BETHESDA, MD -- CoStar Group, Inc. (NASDAQ: CSGP), the ...

2002-06-18 2002 Christopher Nassetta, Host Marriott CEO, Joins CoStar Group Board of Directors

BETHESDA, MD -- CoStar Group, Inc. (NASDAQ: CSGP), the leading information provider to the U.S. commercial real estate industry, announced today that Christopher J. Nassetta has been elected by shareholders to serve on CoStar's Board of Directors.

Mr. Nassetta, 39, is the President and CEO of Bethesda-based Host Marriott Corporation, a position he has held since May 2000. He joined Host Marriott in 1995 as Executive Vice President and was elected Chief Operating Officer in 1997. Prior to joining Host Marriott, Mr. Nassetta served as President of Bailey Realty Corporation from 1991 until 1995, and had previously served as Chief Development Officer and in various other positions with The Oliver Carr Company from 1984 to 1991.

Mr. Nassetta serves on the Board of Directors of Host Marriott. He also serves on the Board of Trustees of Prime Group Realty Trust and as a member of the McIntire School of Commerce Advisory Board for the University of Virginia.

"We are pleased to have someone of Chris's experience and stature join our board," stated CoStar President and CEO Andrew C. Florance. "His extensive experience in commercial real estate and his skill in managing successful operations across a broad geographic platform will be most valuable in our next phase of growth."

About CoStar Group, Inc.

Headquartered in Bethesda, MD, CoStar Group, Inc. (Nasdaq: CSGP), is the leading provider of information services to the U.S. commercial real estate industry. CoStar's suite of products offers customers access to the most comprehensive, verified database of commercial real estate information in 50 U.S. markets. The company has approximately 800 employees nationally in 29 offices, including the industry's largest professional research organization. For more information, visit http://www.costar.com.

This news release includes "forward-looking statements," which involve many risks and uncertainties that could cause actual results to differ materially from these statements. Factors that could cause or contribute to such differences include, but are not limited to, those stated in CoStar's Form 10-Q for the quarter ended March 31, 2002, under the heading "Risk Factors." All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements.
'