Annual Industry-wide Recognition Bestowed on the

‘Best of the Best’ in Commercial Real Estate Brokerage

[JACKSONVILLE, FL]., May 5, 2010 – Marcus & Millichap is pleased to announce that CoStar Group (Nasdaq:CSGP) has selected David Hsieh, vice president, of Jacksonville, Florida, as a CoStar Power Broker Award winner , for being the “best of the best” in commercial real estate brokerage . The annual recognition program, now in its eighth year, spotlights the U.S. firms and individual brokers who closed the highest transaction volume in commercial property sales and leases during the 2009 calendar year. All awards are based on transaction data in CoStar’s commercial real estate information database.

As the largest professional research organization serving the commercial real estate industry, CoStar is in a unique position to identify the top firms and brokers in each market. Every year, CoStar tallies the commercial real estate sales and lease transactions that closed during the previous year and presents CoStar Power Broker Awards to the select few who closed the highest transaction volume in commercial property sales and leases that year. David Hsieh was measured against all the commercial real estate brokers active in the Jacksonville, FL market and ranked based on overall leasing transaction volume for 2009 as reported by CoStar.

“The Power Broker Awards are a true testament to the success of the ‘best of the best’ in commercial real estate,” said CEO Andrew C. Florance. “We are proud to recognize and congratulate all the award winners for their remarkable sales and leasing success.”

The complete list of 2009 CoStar Power Broker Award winners can be found at http://www.costar.com/PowerBrokers/.

About CoStar Group, Inc.

CoStar Group, Inc. (Nasdaq:CSGP) is the number one provider of information, marketing and analytic services to commercial real estate professionals in the United States as well as the United Kingdom. CoStar’s suite of services offers customers access via the Internet to the most comprehensive database of commercial real estate information throughout the U.S. as well as in the United Kingdom and France. Headquartered in Bethesda, MD, CoStar has approximately 1,400 people working for the Firm Name worldwide, including the largest professional research organization in the industry. For more information, visit http://www.costar.com.

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