PRESS RELEASE DETAIL


Jul 11, 2011

CoStar Group to Report Second Quarter 2011 Financial Results on July 27, 2011

Earnings Release to be Issued After Market Close on Wednesday, July 27; Conference Call to Discuss Second Quarter 2011 Financial Results Scheduled for 11:00 AM EDT on Thursday, July 28 WASHINGTON, DC, July 11, 2011 -- CoStar Group, Inc. (Nasdaq:CSGP), commercial real estate's leading provider of information and analytic services, will announce financial results for the second quarter of 2011 following the market close on Wednesday, July 27, 2011. Management will conduct a conference call to discuss the second quarter results and the company's outlook for the third quarter at 11:00 AM EDT on Thursday, July 28, 2011.

Earnings Release to be Issued After Market Close on Wednesday, July 27; Conference Call to Discuss Second Quarter 2011 Financial Results Scheduled for 11:00 AM EDT on Thursday, July 28

WASHINGTON, DC, July 11, 2011 -- CoStar Group, Inc. (Nasdaq:CSGP), commercial real estate's leading provider of information and analytic services, will announce financial results for the second quarter of 2011 following the market close on Wednesday, July 27, 2011. Management will conduct a conference call to discuss the second quarter results and the company's outlook for the third quarter at 11:00 AM EDT on Thursday, July 28, 2011.

To participate in the conference call, please dial (866) 269-9609 (from the United States and Canada) or (612) 332-1213 (from all other countries) and refer to conference code 209746. To listen to the conference call over the Internet, please access the audio webcast link available in the Investors section of CoStar's web site at www.CoStar.com/investors.aspx.

An audio recording of the conference call will be available for replay approximately one hour after the call's completion and remain available for a period of time following the call. To access the recorded conference call, please dial (800) 475-6701 (from the U.S. and Canada) or (320) 365-3844 (from all other countries) using conference code 209746. The webcast replay will also be available in the Investors section of CoStar's web site for a period of time following the call.


About CoStar Group, Inc.

CoStar Group (Nasdaq:CSGP - News) is commercial real estate's leading provider of information and analytic 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. Headquartered in Washington, DC, CoStar maintains offices throughout the U.S. and in Europe with a staff of approximately 1,500 worldwide, including the industry's largest professional research organization. For more information, visit www.costar.com.




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