Lucky Draw in Vegas: Local Retail Real Estate Broker Wins Porsche Cayman from CoStar Group

LAS VEGAS, May 23 /PRNewswire-FirstCall/ -- Brian A. Sorrentino of Las Vegas retail real estate brokerage firm ROI Commercial Real Estate, Inc. accepts the key to a new 2007 Porsche Cayman sportscar from Andrew C. Florance, president and CEO of CoStar Group, Inc. Sorrentino's business card was drawn from more than 5,000 entries over the course of three days at two CoStar booths during the International Council of Shopping Centers Spring Convention, which was held here May 20-23, 2007.

CoStar Group, Inc. (NASDAQ: CSGP) is the number one provider of information services to commercial real estate professionals in the United States as well as the United Kingdom. CoStar's suite of services offers approximately 75,000 customers access via the Internet to the most comprehensive database of commercial real estate information in 121 metro Core Based Statistical Areas throughout the U.S. as well as in the United Kingdom and France. Headquartered in Bethesda, MD, the company has approximately 1,300 employees, including the largest professional research organization in the industry. For more information, visit http://www.costar.com/.

This news release includes "forward-looking statements" including, without limitation, statements regarding CoStar's expectations, beliefs, intentions or strategies regarding the future. These statements are subject to many risks and uncertainties that could cause actual results to differ materially from these statements. More information about potential factors that could cause actual results to differ materially from those discussed in the forward- looking statements include, but are not limited to, those stated in CoStar's filings from time to time with the Securities and Exchange Commission, including CoStar's Form 10-K for the year ended December 31, 2006, under the heading "Risk Factors" and CoStar's Form 10-Q for the quarter ended March 31, 2007, 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.