PRESS RELEASE DETAIL


Dec 18, 2007

CoStar Group Launches Comprehensive Commercial Real Estate Information in Toledo, OH

2006-01-10 2006 CoStar Group Launches Comprehensive Commercial Real Estate Information in Toledo, OH Top Commercial Brokerage Firms Sign on as Customers

2006-01-10 2006 CoStar Group Launches Comprehensive Commercial Real Estate Information in Toledo, OH Top Commercial Brokerage Firms Sign on as Customers

BETHESDA, MD -- CoStar Group, Inc. (NASDAQ: CSGP) today announced it has expanded its database of industry-leading market information to include Toledo, OH. The benefits of CoStar's researched information service are designed to significantly improve commercial real estate professionals' productivity and ability to meet the needs of their clients.

Leading commercial real estate firms have quickly embraced CoStar's unique value to the commercial real estate market. Michael Realty, Fifth Third Bank, Signature Associates and Chicago Title are among the first to subscribe to CoStar's Toledo, OH information service.

"We are pleased to begin service in Toledo, providing comprehensive office, industrial and retail information to the market, as well as our enhanced for-sale listings," stated CoStar President & CEO Andrew C. Florance. "We expect that our comprehensive coverage of the Toledo commercial real estate market will be valuable to local commercial real estate professionals as well as to our broad national subscriber base. We believe that the information and imagery that we offer on 17 million square feet of total property availability is the most comprehensive coverage in the market, so it's not a surprise that these leading companies recently subscribed to our service."

To provide industry-leading property details on all commercial buildings in Toledo, CoStar Field Research teams have been working in the market since May 2004. They have been photographing and researching information on every commercial real estate property in Toledo – office, industrial, retail and commercial land. Complementing this field activity, CoStar Research Analysts work to update over 100 pieces of information on any given building providing comprehensive, verified information on CoStar's vast property inventory. This detailed information includes rentable building area, floor size, building amenities, for-sale and for-lease availability, asking rental rates, vacancy rates, 360-degree images, detailed, high resolution photographs, property contacts and many additional pieces of information providing a clear picture of each property.

CoStar's continually expanding Toledo database currently includes over 7,600 properties totaling over 173 million square feet of inventory and over 17 million square feet of available space.

Toledo's commercial real estate professionals who subscribe to CoStar Property Professional® also have access to CoStar's national inventory of over 95,000 for-sale listings, which has grown by over 80% during 2005. There is no charge to list properties in CoStar's nationwide database.

CoStar's entry into Toldeo is part of a planned 21 market expansion that began in 2004. CoStar has also signed license agreements in other recently opened expansion markets with leading firms such as Advantis/GVA, CB Richard Ellis, Colliers Arnold, Cross & Company, Commerce CRG, Trammell Crow, Transwestern Commercial Services and many other firms.

About CoStar Group, Inc.

CoStar Group, Inc., (NASDAQ: CSGP) is the leading provider of information services to commercial real estate professionals in the United States and the United Kingdom. CoStar's suite of services offers customers access via the Internet to the most comprehensive database of commercial real estate information on 59 U.S. markets and the United Kingdom. Based in Bethesda, MD, the company has approximately 1,000 employees throughout the United States and the United Kingdom, including the largest professional research organization in the industry. For additional information, please visit 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-Q for the quarter ended September 30, 2005, under the heading "Risk Factors." In addition to these statements, there can be no assurance that CoStar's coverage of this market will significantly improve commercial real estate professionals' productivity and ability to meet the needs of their clients, will be valuable to local commercial real estate professionals as well as to CoStar's broad national subscriber base, that the information and imagery that CoStar offers on the amount of square feet of total property availability for the Toledo, Ohio market stated in this press release is the most comprehensive coverage available in the market or that CoStar will complete its planned 21-market expansion. All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements.
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