CoStar Showcase Receives Tremendous Market Reception at ICSC Event, Total Subscriptions Surpass $2 Million

More Than 300 Firms Find that New Online Marketing Service Delivers on
Promise to Provide Enhanced Property Exposure and More Qualified
Lead-Generation

BETHESDA, Md., June 4 /PRNewswire-FirstCall/ -- CoStar Group, Inc.
(Nasdaq: CSGP), the number one provider of commercial real estate
information/marketing solutions, today announced that CoStar Showcase(R)
(http://www.CoStar.com), its new online property marketing service, has
surpassed $2 million in initial subscription orders. More than 300 firms
have signed up to market their listings through the innovative new service,
which officially debuted at the International Council of Shopping Centers
(ICSC) RECon event held last month in Las Vegas.

(Logo: http://www.newscom.com/cgi-bin/prnh/20060510/COSTARLOGO )

"Based on the enthusiastic response CoStar Showcase received at ICSC,
and continued strong interest from our clients, it's clear there is
substantial demand among commercial property professionals for a more
effective way to market their property listings online," said CoStar Group
Founder and CEO Andrew C. Florance. "We believe CoStar Showcase offers a
better solution, and we couldn't be more pleased with the market response
for our new online marketing service. While some of these contracts include
a trial period and an option to cancel, the response to date clearly
indicates these clients find CoStar Showcase to be a very compelling and
effective solution for marketing their listings online."

The thousands of up-to-date, research-verified property listings
available free and without registration at http://www.costar.com offer an
enormously valuable resource for those searching for available office,
retail, warehouse/industrial, multifamily, land and other commercial
properties. By going to http://www.costar.com, visitors can use the free
property search tool to access thousands of available for sale and for
lease listings, which are updated and maintained by CoStar's own research
service, the industry's largest.

About CoStar Group, Inc.

CoStar Group, Inc. (Nasdaq: CSGP) is the number one provider of
information/marketing services to commercial real estate professionals in
the United States as well as the United Kingdom. CoStar's suite of services
offers customers access via the Internet to the most comprehensive database
of commercial real estate information 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, 2007 and CoStar's Form 10-Q for the quarter ended March 31,
2008, under the heading "Risk Factors." In addition to these statements,
there can be no assurance that clients will continue to show strong
interest for CoStar Showcase; that there is substantial demand among
commercial property professionals for a more effective way to market their
property listings online; that CoStar Showcase offers a better solution;
that the response to date indicates the clients find CoStar Showcase to be
a very compelling and effective solution for marketing their listings
online; that the listings available at http://www.costar.com will provide
an enormously valuable resource for those searching for available
commercial properties; or that visitors to http://www.costar.com that use
the free property search tool will be able to access thousands of available
for sale and for lease listings. 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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[Via Real Estate Newswire]