CoStar Group has purchased an office building at 1331 L Street, N.W. in Washington, D.C., through a wholly owned subsidiary, for $41.25 million where it plans to locate its Headquarters. As incentive for CoStar to relocate its headquarters to the District, The Council of the District of Columbia approved $6.1 million in property tax abatements over a 10-year period, provided CoStar hires 100 District residents, among other things.

CoStar Group, Inc. (Nasdaq:CSGP), the number one provider of information, marketing and analytic services to the commercial real estate industry, will announce financial results for the fourth quarter and full year of 2009 following the market close on Wednesday, February 24, 2010. Management will conduct a conference call to discuss the fourth quarter results and the company's outlook for 2010 at 11:00 AM EST on Thursday, February 25, 2010.

CoStar Group, Inc. (Nasdaq: CSGP) today announced that SHOWCASE.com(R) (http://www.showcase.com) continues to attract large numbers of subscribers and generate impressive revenue growth since launching only 19 months ago. More than 8,800 brokers are marketing their listings through SHOWCASE.com, an online marketing service for commercial real estate brokers to advertise their available property directly to tenants and buyers.   For CoStar Group, the new product is currently generating more than $5 million in annualized revenue.

The Council of the District of Columbia approved the offering of approximately $6.1 million in real estate property tax abatements over a 10-year period, if CoStar Group relocates and hires 100 District residents.  In addition, CoStar Group may be eligible for additional incentives such as a five year elimination of district corporate income tax and certain sale and use tax exemptions.

CoStar Group, Inc., and LoopNet, Inc., today announced that they have settled all current litigation between the companies. The settlement resolves false advertising litigation in New York, breach of contract and unfair competition litigation in California, and copyright litigation in Maryland. No monetary consideration was involved.

CoStar Group today announced that, for the first time ever, online viewers can watch the constant flow of activity occurring throughout the commercial real estate industry on CoStar’s website at www.CoStar.com. The unique visual display captures the hundreds of thousands of listing updates, reported lease and sales transactions, and property searches taking place in CoStar’s comprehensive database of commercial real estate information every day, showing where the activity is occurring as it happens.

Noted Real Estate Economist Dr. Norm Miller Joins CoStar Group to Direct Integration of PPR's Industry-Leading Analytic and Forecasting Assets With CoStar's Database of Comprehensive Real Estate Information.

CoStar Group announced that it was named one of "America's 200 Best Small Companies" by Forbes magazine. The annual ranking appeared in the issue dated November 2, 2009 and on Forbes' website at www.forbes.com/200best.

CoStar Group, Inc. today announced that revenues for the third quarter of 2009 were $53.6 million, an increase of $3.5 million or 7%, compared to revenues of $50.1 million for the second quarter of 2009, as acquisition revenue and stronger than anticipated organic revenue contributed to sequential quarterly revenue growth.

CoStar acquired Resolve Technology, the leading provider of business intelligence and portfolio management software serving institutional real estate investment clients.