The CoStar indices are constructed using a repeat sales methodology, widely considered the most accurate measure of price changes for real estate. This methodology measures the movement in the prices of commercial properties by collecting data on actual transaction prices. When a property is sold more than one time, a sales pair is created. The prices from the first and second sales are then used to calculate price movement for the property. The aggregated price changes from all of the sales pairs are used to create a price index.

More charts accompanying this release are available at http://media.globenewswire.com/cache/9473/file/20256.pdf CONTACT:

For more information about CCRSI Indices, including our legal notices and disclaimer, please visit http://www.costar.com/ccrsi .

ABOUT COSTAR GROUP, INC.

CoStar Group (Nasdaq:CSGP) is commercial real estate's leading provider of information, analytics and marketing services. Founded in 1987, CoStar conducts expansive, ongoing research to produce and maintain the largest and most comprehensive database of commercial real estate information. Our suite of online services enables clients to analyze, interpret and gain unmatched insight on commercial property values, market conditions and current availabilities. Through LoopNet, the Company operates the most heavily trafficked commercial real estate marketplace online with more than 7 million registered members. CoStar operates websites that have approximately 10 million unique monthly visitors in aggregate. Headquartered in Washington, DC, CoStar maintains offices throughout the U.S. and in Europe with a staff of approximately 2,000 worldwide, including the industry's largest professional research organization. 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 based upon current beliefs and are subject to many risks and uncertainties that could cause actual results to differ materially from these statements. The following factors, among others, could cause or contribute to such differences: the risk that the trends represented or implied by the indices will not continue or produce the results suggested by such trends, including without limitation a sustained recovery; the risk that investor sentiment and demand and commercial real estate pricing levels will not continue at the levels or with the trends indicated in this release; and the possibility that the pricing recovery does not continue to encourage lending and capital inflows or that a more liquid and efficient market will not support further advances in pricing. 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 Annual Report on Form 10-K for the year ended December 31, 2012, and CoStar's Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, under the heading "Risk Factors" in each of these filings. All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements, whether as a result of new information, future events or otherwise.
CONTACT: Mark Klionsky         Senior Vice President-Marketing         (800) 681-1513         mklionsky@costar.com

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