PRESS RELEASE DETAIL


Jan 18, 2008

CoStar Group Signs National, Multi-Year Agreement With Marcus & Millichap

2002-03-13 2002 CoStar Group Signs National, Multi-Year Agreement With Marcus & Millichap Expanded Relationship Brings Additional Products to Additional Markets

2002-03-13 2002 CoStar Group Signs National, Multi-Year Agreement With Marcus & Millichap Expanded Relationship Brings Additional Products to Additional Markets

BETHESDA, MD -- CoStar Group Inc. (NASDAQ: CSGP), the leading provider of information services to the U.S. commercial real estate industry, has signed a multi-market, multi-year renewal agreement with Marcus & Millichap, the nation's largest real estate investment brokerage firm.

Under terms of the agreement, CoStar will provide Marcus & Millichap brokers with access to CoStar Property™ in 26 U.S. markets. CoStar Property is the nation's largest and most comprehensive inventory of office and industrial properties. Marcus & Millichap's 600 investment professionals and national research team also have access to CoStar COMPS®, the most comprehensive confirmed sales transaction database in the nation.

"Marcus & Millichap continues to be our largest corporate client for CoStar COMPS," said Andrew C. Florance, CoStar president and CEO. "Clearly, CoStar's products bring additional value to Marcus & Millichap's efforts to provide the most comprehensive national investment perspective to its clients. Our products will continue to supplement Marcus & Millichap's current outstanding research and analysis capabilities."

"We are committed to providing the best possible service to our clients," said Hessam Nadji, managing director and chief marketing officer for Marcus & Millichap. "CoStar's products are an important part of our market data collection efforts, which span numerous local and national sources as well as our own databases. By accessing and analyzing the broadest data set available in the marketplace, our investment professionals are able to help investors formulate the right investment strategy."

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 850 employees and contractors in 27 offices nationally, including approximately 600 highly trained commercial real estate research professionals.

About Marcus & Millichap

With 34 offices nationwide and sales in excess of $6.4 billion last year, Encino, Calif.-based Marcus & Millichap is the largest commercial real estate brokerage in the nation focusing exclusively on real estate investments. Since its inception in 1971, the firm has perfected a powerful system for marketing properties that combines product specialization; local market expertise; the industry's most comprehensive research and analysis capabilities; state-of-the-art technology; and established relationships with the largest pool of qualified investors nationally.

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 ended September 30, 2001, 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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