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. loopnet is the most heavily trafficked commercial real estate marketplace online with more than 9.8 million registered members. apartments.com, apartmentfinder.com and apartmenthomeliving.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 operates websites with over 23.6 million unique monthly visitors in aggregate as of june 2015. headquartered in washington, dc, costar maintains off