PRESS RELEASE DETAIL


Dec 27, 2007

CoStar Group Completes PeerMark Acquisition

2004-05-04 2004 CoStar Group Completes PeerMark Acquisition Company Launches 21-Market Expansion with Entry into Nashville, Memphis

BETHESDA, M...

2004-05-04 2004 CoStar Group Completes PeerMark Acquisition Company Launches 21-Market Expansion with Entry into Nashville, Memphis

BETHESDA, MD -- CoStar Group, Inc. (NASDAQ:CSGP), the leading provider of information services to the commercial real estate industry in the U.S. and U.K., today announced it has completed its acquisition of Peer Market Research, Inc. (PeerMark), an online provider of commercial real estate information in Nashville and Memphis, TN.

"We are looking forward to introducing commercial real estate professionals in Nashville and Memphis to our comprehensive services," stated CoStar President & CEO Andrew C. Florance. "As part of CoStar's international network, we believe these markets will benefit from being more visible to the multi-market owners, investors and lenders that drive commercial real estate activity."

Permanent CoStar field research teams are expected to arrive in Nashville and Memphis next week to begin expanding the coverage of properties included within the PeerMark database. "With our intensive field research process, we expect to add approximately 200 million square feet of space and thousands of building photos to the existing database in these cities," Florance added.

In addition to Memphis and Nashville, CoStar plans to expand its geographic coverage into 19 new markets in 2004 and 2005 under an aggressive expansion plan announced in February 2004. The Company recently took delivery of 35 specially-outfitted field research vehicles and currently is training approximately 45 new field researchers and photographers in Richmond, VA.

About CoStar Group, Inc.

CoStar Group, Inc., (NASDAQ: CSGP) is the leading provider of information services to commercial real estate professionals in the United States and the United Kingdom. CoStar's suite of services offers customers access via the Internet to the most comprehensive database of commercial real estate information on 50 U.S. markets, London and the United Kingdom. Based in Bethesda, MD, the company has approximately 900 employees in 37 offices throughout the United States and the United Kingdom, including the largest professional research organization in the industry.

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. In addition to these statements, there can be no assurance that CoStar will release services in Memphis or Nashville, TN, that CoStar will expand the coverage of properties included within the PeerMark database or add photos, or that CoStar will expand into other markets in 2004 or 2005. 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, 2003, 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.
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