CoStar Group, the leading provider of commercial real estate information, analytics and online marketplaces, today announced its acquisition of Houses.com, setting the stage for its entry into residential real estate marketplaces. On December 16, 2020, the Federal Trade Commission cleared CoStar Group’s acquisition of Homesnap, Inc., which provides real estate brokers with a mobile platform and other technology for managing and analyzing their listings and the housing market.

CoStar Group has been successful for many years running marketplace verticals in the commercial real estate space with Loopnet.com, Cityfeet.com and Showcase.com; the multifamily space with Apartments.com, ForRent.com, ApartmentFinder.com, ApartmentHomeLiving.com and Apartamentos.com; the land space with Land.com, LandsofAmerica.com, LandWatch.com and LandandFarm.com; and the businesses for sale space with BizBuySell.com and BizQuest.com.

With the acquisition of the Houses.com domain name, CoStar Group plans to develop a vibrant national marketplace for agents and owners to successfully sell homes without disenfranchising or disintermediating valuable real estate agents in the process.

About CoStar Group, Inc.

CoStar Group, Inc. (NASDAQ: CSGP) is the leading provider of commercial real estate information, analytics and online marketplaces. Founded in 1987, CoStar conducts expansive, ongoing research to produce and maintain the largest and most comprehensive database of commercial real estate information. Our suite of online services enables clients to analyze, interpret and gain unmatched insight on commercial property values, market conditions and current availabilities. STR provides premium data benchmarking, analytics and marketplace insights for the global hospitality sector. Ten-X provides a leading platform for conducting commercial real estate online auctions and negotiated bids. LoopNet is the most heavily trafficked commercial real estate marketplace online with over 7 million monthly unique visitors. Realla is the UK’s most comprehensive commercial property digital marketplace. Apartments.com, ApartmentFinder.com, ForRent.com, ApartmentHomeLiving.com, Westside Rentals, AFTER55.com, CorporateHousing.com, ForRentUniversity.com and Apartamentos.com form the premier online apartment resource for renters seeking great apartment homes and provide property managers and owners a proven platform for marketing their properties. CoStar Group’s websites attracted an average of approximately 69 million unique monthly visitors in aggregate in the third quarter of 2020. Headquartered in Washington, DC, CoStar Group maintains offices throughout the U.S. and in Europe, Canada and Asia with a staff of over 4,300 worldwide, including the industry’s largest professional research organization. For more information, visit www.costargroup.com.

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 based upon current beliefs and are subject to many risks and uncertainties that could cause actual results to differ materially from these statements, including the risk that CoStar’s plans change with respect to Houses.com. 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 in CoStar's Annual Report on Form 10- K for the year ended December 31, 2019, and CoStar’s Quarterly Reports on Form 10-Q for the quarters ended March 31, 2020, June 30, 2020 and September 30, 2020, each of which is filed with the SEC, including in the "Risk Factors" section of those filings, as well as the company's other filings with the SEC available at the SEC's website (www.sec.gov). All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements, whether as a result of new information, future events or otherwise.

Matthew Blocher Vice President, CoStar Group Corporate Marketing & Communications (202) 346-6775 mblocher@costar.com