CoStar Group Announces Winners of 2012 CoStar Power Broker Awards

CoStar Group Announces Winners of 2012 CoStar Power Broker Awards

Annual Awards Recognize Top Commercial Real Estate Dealmakers

WASHINGTON, March 4, 2013 (GLOBE NEWSWIRE) -- CoStar Group, Inc.
(Nasdaq:CSGP), commercial real estate's leading internet provider of
information, analytics and marketing services, is pleased to announce the
winners of the 2012 CoStar Power Broker Awards™, recognizing the best of the
best in commercial real estate brokerage.

With the largest professional research organization serving the commercial
real estate industry, CoStar is uniquely positioned to identify the top firms
and brokers in each market. Every year, CoStar records the commercial real
estate sales and lease transactions that closed during the previous year and
presents CoStar Power Broker Awards to the brokerage firms and individual
brokers who closed the highest transaction volumes in commercial property
sales and leases in each market.

"CoStar is proud to honor the firms and brokers who perform at the industry's
highest level each year," said CoStar Group CEO Andrew C. Florance. "These
industry leaders deserve to be recognized for their hard work, expertise and
superior deal-making abilities. We extend our congratulations to this year's
winners on their achievements."

The CoStar Power Broker Awards winners include brokers from national
powerhouses including CBRE, Jones Lang LaSalle, Cushman & Wakefield, Cassidy
Turley, Newmark Grubb Knight Frank, and Colliers International. These winners
are joined by the top brokers and firms in over 90 markets across the country.
A complete list of CoStar Power Broker awards winners by market can be found
at www.CoStarPowerBrokers.com.

All CoStar Power Broker Awards are based on transaction data in CoStar's
commercial real estate database, which is the largest, independently
researched database of commercial real estate property information available
online. Information in CoStar's database is verified and continuously updated
by over 1,000 CoStar researchers. CoStar's U.S. database contains more than
3.8 million commercial properties, and the total U.S. square footage of gross
building area tracked and maintained by CoStar exceeds 91 billion square feet.

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 6.7
million registered members. CoStar operates websites that have over 10 million
unique monthly visitors in aggregate. 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 expectations, beliefs, intentions or
strategies regarding the future. These statements are based upon current
beliefs 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 Annual Report on Form
10-K for the year ended December 31, 2012, under the heading "Risk Factors."
All forward-looking statements are based on information available to CoStar on
the date hereof, and CoStar assumes no obligation to update such statements,
whether as a result of new information, future events or otherwise.

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