BETHESDA, Md., Nov. 3 /PRNewswire-FirstCall/ -- CoStar Group, Inc. , the number one provider of information services to the commercial real estate industry, today announced that for the eighth consecutive year it has been named a Maryland Technology Fast 50 Company by Deloitte & Touche LLP.

(Logo: http://www.newscom.com/cgi-bin/prnh/20060510/COSTARLOGO )

CoStar Group's revenue grew by 85.3% between 2001 and 2005, the five-year period on which the rankings are based. The company reported revenue of $134.3 million in 2005.

"We are extremely honored to once again rank in the Deloitte & Touche Maryland Fast 50," said CoStar Group President and CEO Andrew C. Florance. "This ranking reflects the hard work by everyone at CoStar as we continue to achieve subscription revenue growth and invest in the company's expansion." Florance added, "CoStar is committed to maximizing the use of technology to provide the most comprehensive commercial real estate information available."

Founded in 1987, CoStar Group established itself as an independent source of local market information for commercial real estate firms in Washington, D.C. and Baltimore. Since its IPO in July 1998 and follow-on offerings in May 1999 and November 2003, CoStar has expanded its mix of services and geographic platform to cover 66 U.S. markets and the United Kingdom. The company gathers and verifies for-sale and for-lease listings across all commercial property types -- office, industrial, retail, land, mixed-use, hospitality and multifamily.

Technology has been the backbone of CoStar Group services. The company uses web-based products to deliver the most comprehensive database of commercial real estate information to its customers. Additionally, CoStar's approximately 800 research professionals use a state-of-the-art, proprietary research system to maintain and update over 500,000 active listings.

CoStar field researchers use a fleet of 89 environmentally-friendly Prius cars that have been customized as high-tech CoStar field mobile units containing proprietary GPS-tracking software integrated with wireless technology to transmit and receive data. This technology allows employees in CoStar's dispatch center to view each vehicle's progress in real time. Additionally, the Prius cars are equipped with sophisticated laptops, 10 mega- pixel digital cameras and handheld laser instruments to help precisely measure buildings, geo-code them and position them on digital maps, then transmit that data to office-based CoStar research analysts. CoStar's fleet also consists of 48 Dodge Sprinter vans, also specially equipped with sophisticated technologies to collect and photograph commercial property information.

To qualify for the Technology Fast 50 -- a ranking of the 50 fastest growing companies in each of 16 regions in the technology, media, telecommunications and life sciences sectors -- companies must have had operating revenues of at least $50,000 in 2001 and $5,000,000 in 2005, be headquartered in North America, and be a company that owns proprietary technology or proprietary intellectual property that contributes to a significant portion of the company's operating revenue or devotes a significant proportion of revenues to the research and development of technology.

Winners of the 16 regional Technology Fast 50 programs in the United States and Canada are automatically entered in Deloitte's Technology Fast 500 program, which ranks North America's top 500 fastest growing technology, media, telecommunications and life sciences companies.

About Deloitte

Deloitte refers to one or more of Deloitte Touche Tohmatsu, a Swiss Verein, its member firms and their respective subsidiaries and affiliates. As a Swiss Verein (association), neither Deloitte Touche Tohmatsu nor any of its member firms has any liability for each other's acts or omissions. Each of the member firms is a separate and independent legal entity operating under the names of "Deloitte," "Deloitte & Touche," "Deloitte Touche Tohmatsu" or other related names. Services are provided by the member firms or their subsidiaries or affiliates and not by Deloitte Touche Tohmatsu.

Deloitte & Touche USA LLP is the US member firm of Deloitte Touche Tohmatsu. In the U.S., services are provided by the subsidiaries of Deloitte & Touche USA LLP (Deloitte & Touche LLP, Deloitte Consulting LLP, Deloitte Financial Advisory Services LLP, Deloitte Tax LLP and their subsidiaries), and not by Deloitte & Touche USA LLP.

About CoStar Group, Inc.

CoStar Group, Inc. is the number one 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 66 U.S. markets, London and the United Kingdom. Headquartered in Bethesda, MD, the company has approximately 1,200 employees 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. 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, 2005 and CoStar's Form 10-Q for the quarter ended June 30, 2006, under the heading "Risk Factors." In addition to these statements, there can be no assurance that CoStar will continue to achieve subscription revenue growth at the same rate as that achieved between 2001 and 2005; that we will be able to continue to successfully invest in the company's expansion; or that we will be able to continue to successfully maximize the use of technology to provide the most comprehensive commercial real estate information available. All forward- looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements.

CONTACT: Audra Capas, Vice President, Communications, +1-301-280-7674, or
acapas@costar.com, or Maureen Wheeler, Director, Communications,
+1-301-664-9122, or mwheeler@costar.com both of CoStar Group, Inc.

Web site: http://www.costar.com/