CoStar is the world leader in operating digital CRE marketplaces, and attracts 40 million unique visitors a month across its North American and European websites. The CoStar network includes LoopNet.com, the number one commercial property marketplace and Apartments.com, the number one apartment marketing site. Over the past five years CoStar Group has invested billions of dollars into building the world’s leading online property marketplaces, generating hundreds of millions of leads resulting in millions of successful commercial property transactions for our clients.