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CoStar Group to Report Fourth Quarter 2012 Financial Results on February 27, 2013

CoStar Group to Report Fourth Quarter 2012 Financial Results on February 27,
2013

Earnings Release to be Issued After Market Close on Wednesday, February 27;
Conference Call to Discuss Fourth Quarter 2012 Financial Results Scheduled for
11:00 AM EST on Thursday, February 28

WASHINGTON, Jan. 28, 2013 (GLOBE NEWSWIRE) -- CoStar Group, Inc. (Nasdaq:CSGP)
will announce financial results for the fourth quarter of 2012 following the
market close on Wednesday, February 27, 2013. Management will conduct a
conference call to discuss the fourth quarter and full-year results at 11:00
AM EST on Thursday, February 28, 2013.

To participate in the conference call, please dial (800) 230-1096 (from the
United States and Canada) or (612) 332-0107 (from all other countries) and
refer to conference code 279285. To listen to the conference call over the
Internet, please access the audio webcast link available in the Investors
section of CoStar's website 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 will 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 access code 279285. The webcast replay will
also be available in the Investors section of CoStar's website for a period of
time following the call.

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 6.5
million registered members and 3.5 million unique monthly visitors.
Headquartered in Washington, DC, CoStar maintains offices throughout the U.S.
and in Europe including the industry's largest professional research
organization. For more information, visit www.costar.com.

This news release includes "forward-looking statements" including, without
limitation, statements regarding CoStar's plans, objectives, expectations,
beliefs, intentions or strategies regarding the future. These statements are
based upon the current beliefs and expectations of management of CoStar and
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, 2011, and CoStar's Form 10-Q for the quarter ended September 30, 2012,
under the heading "Risk Factors." All forward-looking statements are based on
information available to CoStar on the date hereof, and CoStar does not
undertake any obligation to update or revise any forward-looking statements,
whether as a result of new information, future events or otherwise.

CONTACT: ALL INQUIRIES:
         Richard Simonelli
         Director of Investor Relations
         (202) 346-6394
         rsimonelli@costar.com