LoopNet.com Uses Stunning Visual Effect to Make 12-Story Building in Downtown Los Angeles "Disappear"

LoopNet.com Uses Stunning Visual Effect to Make 12-Story Building in Downtown
Los Angeles "Disappear"

Progressive Event Demonstrates That if a Commercial Property Isn't Advertised
on LoopNet.com, it Might as Well be Invisible

LOS ANGELES, Jan. 18, 2013 (GLOBE NEWSWIRE) -- CoStar Group's LoopNet.com, the
#1 marketplace for commercial real estate online, made history Thursday night
when a 12-story building in downtown Los Angeles vanished before a live
audience as part of a national marketing campaign supporting its Premium
Lister product. The event demonstrates that if a property isn't advertised
with a premium listing on LoopNet.com, it might as well be invisible.

"With more than 6.5 million registered members and 3.5 million unique monthly
visitors, LoopNet.com is the premier tool for effectively marketing commercial
real estate online," stated CoStar Group Founder and CEO Andrew C. Florance.
"Premium Lister leverages LoopNet.com's powerful online marketing platform and
gives commercial real estate brokers and owners broad exposure for their
listings, access to leads lists, and advanced marketing capabilities."

In addition to the stunning visual effect, the event featured a live
performance by the Grammy® Award-winning band, Train, which performed two sets
before an audience of more than 700 CoStar clients and guests. In addition,
CoStar partnered with the band on several charitable initiatives, making
$10,000 donations to two charities, Family House and Little Kids Rock. CoStar
also will donate a guitar autographed by Train to a local music school in
support of Train's commitment to music education. Family House is a 501(c) (3)
not-for-profit organization that provides temporary housing to families of
seriously ill children receiving treatment at the University of California San
Francisco Benioff Children's Hospital. Little Kids Rock is an organization
that provides free musical instruments and music instruction to underserved
schools across the country.

A video of the event is available online here.

The multi-channel marketing campaign for Premium Lister was developed by
Creative i, a Palo Alto-based integrated communications firm. Cutting-edge, 3D
projection technology was used to create the illusion, emphasizing the lack of
visibility for properties marketed without LoopNet.com. The technology was
developed by Pearl Media, a non-traditional out-of-home media and content
company with a client roster that includes Lexus, Chevy, THQ and Twentieth
Century Fox Home Entertainment.

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.

         Richard Simonelli
         Office: (202) 346-6394
         Mobile: (301) 351-1136
Press spacebar to pause and continue. Press esc to stop.