PRESS RELEASE DETAIL


Jan 18, 2008

CoStar ARES® 6.0 Compatible with ACT! 6.0

2002-08-20 2002 CoStar ARES® 6.0 Compatible with ACT! 6.0 CoStar Group's Contact Management Tool Now More Powerful

BETHESDA, MD -- CoStar Group...

2002-08-20 2002 CoStar ARES® 6.0 Compatible with ACT! 6.0 CoStar Group's Contact Management Tool Now More Powerful

BETHESDA, MD -- CoStar Group, Inc. (NASDAQ: CSGP) today announced that its contact management tool for commercial real estate professionals, CoStar ARES 6.0®, will be fully compatible with newly launched ACT! 6.0. As an add-on to ACT!™, CoStar ARES 6.0 is a proven productivity booster: an office-wide solution that allows commercial real estate professionals to track contacts, listings and comparables. A final release date for CoStar ARES 6.0 will be announced soon.

"Real estate professionals use CoStar ARES to develop more contacts, create better relationships, produce repeat business and close more deals than ever before," said CoStar Group's Michael Griffin, product manager for CoStar ARES. "It's easy to set up your own customizable in-house databases using researched CoStar information as your data source," Griffin added.

CoStar ARES allows commercial real estate professionals to import data from a number of sources, including CoStar subscription applications -- CoStar Property®, CoStar COMPS®, CoStar Exchange® and CoStar Tenant®. Commercial real estate professionals can navigate quickly and easily between linked contacts, properties and listings/comparables. Powerful functionality allows users to work more efficiently, expand marketing reach, manage information, increase productivity and close more transactions.

"CoStar ARES is one of our most popular vertical market add-on products," said Kristi Sprecher, senior director of ACT! partner programs, Best Software. "We are thrilled with the number of requests we get for this product and are confident that real estate professionals will greatly benefit from using CoStar ARES with the new features in ACT! 6.0."

CoStar ARES is supported by CoStar customer service, Web-based user training and onsite support. For more information, call 888-807-8989 or visit http://www.costar.com/products/.

About CoStar Group, Inc.

Headquartered in Bethesda, MD, CoStar Group, Inc. (NASDAQ: CSGP), is the leading provider of information services to the U.S. commercial real estate industry. CoStar's suite of products offers customers access to the most comprehensive, verified database of commercial real estate information in over 50 U.S. markets. The company has approximately 800 employees and contractors nationally in 30 offices, including the industry's largest professional research organization.

This news release includes "forward-looking statements," which involve many risks and uncertainties that could cause actual results to differ materially from these statements. Factors that could cause or contribute to such differences include, but are not limited to, those stated in CoStar's Form 10-Q for the Quarter ender June 30, 2002, 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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