Real Estate Central

Ritchie Commercial Broker Cyrus Weiss Won

5,000 when his San Francisco
Retail Property Became CoStar’s One-Millionth Listing

BETHESDA, Md., May 15 /PRNewswire-FirstCall/ — CoStar Group, Inc.
(Nasdaq: CSGP), the number one provider of commercial real estate
information/marketing solutions, today announced that the total number of
for sale and for lease listings in its online database of commercial real
estate information surpassed one million listings this week. This
unprecedented amount is believed to be the largest number of commercial
property listings ever assembled by a single information provider.

(Photo: http://www.newscom.com/cgi-bin/prnh/20080515/NETH138 )

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

According to CoStar Group Founder and CEO Andrew C. Florance, crossing
a milestone of one million online listings marks the commercial real estate
industry’s transition from primarily a paper-based industry to a
sophisticated, more-efficient, and more-transparent digital marketplace.

“CoStar pioneered the concept of commercial real estate firms
outsourcing their property information functions 20 years ago,
fundamentally changing the way commercial real estate professionals access,
use and share property information,” Florance said. “The astounding number
of listings being accessed today across CoStar’s information platform by
tens of thousands of users throughout the U.S. and U.K. is a clear
indication of how far the industry has changed from the outmoded and
inefficient paper-based information exchange of the past, to the greater
efficiency, increased productivity and cost-savings that result from using
CoStar.”

Among the major information providers currently serving commercial real
estate, only CoStar can bring the resources of a more than 900-person
research team to actively seek out, confirm and update listing information
on commercial properties.

From a competitive market share perspective, Florance said the
million-plus listings in CoStar’s database far outpaces the amount of
listings available from other commercial real estate listing firms.
“There’s no comparison. In fact, based on the listing totals reported by
our next largest competitors in both the U.S. and U.K., CoStar has more
listings than both of them combined,” he said.

As confirmed by CoStar Research, the one-millionth property listing is
a three-level storefront retail and office building at 1674-76 Lombard
Street in San Francisco listed with CoStar this week by Cyrus Weiss of
Ritchie Commercial, a longtime CoStar client.

To commemorate this important milestone, Mr. Florance personally
visited Mr. Weiss to thank him for listing his property with CoStar, and to
inform him that he had won a new Toyota Prius hybrid car. While thrilled to
learn that his was the one millionth listing on CoStar, Mr. Weiss responded
that he no longer drove a car and that he preferred that his prize be
awarded in CoStar stock!

CoStar agreed and plans to deposit

5,000 into an account of Mr.
Weiss’ choosing that he can then use to purchase CoStar stock.

Mr. Weiss uses CoStar Group information services to search for
properties and to market his listings. With one call to CoStar Research,
Mr. Weiss made his listing available to three key audiences as part of
CoStar’s multiple channel, ‘one-stop shop’ service: to other commercial
real estate service providers through CoStar Property Professional(R); to
Ritchie Commercial’s client base through the firm’s web site via CoStar
Connect(R); and to an enormous online audience that visits
http://www.CoStar.com, which includes 1.3 million unique visitors
quarterly, all of whom have access to his listing through CoStar
Showcase(R).

About CoStar Group

CoStar Group, Inc. (Nasdaq: CSGP) is the number one provider of
commercial real estate information/marketing services to commercial real
estate professionals in the United States and 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 CoStar’s database of commercial real estate
information has the largest number of commercial property listings ever
assembled by a single information provider; that all subscribers will
experience greater efficiency, increased productivity and cost-savings from
using CoStar; that Mr. Weiss will ultimately choose to purchase CoStar
stock with his award; and that the Ritchie Commercial listing will be
accessible as indicated in this release. 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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Source: Real Estate Newswire