CoStar Group, Inc. Common Stock, also called CoStar Group, is engaged in the provision of information, analytics, and marketing services to the commercial real estate industry. Read More Its integrated suite of online service offerings includes information about space available for lease, comparable sales information, tenant information, information about properties for sale, internet marketing services, analytical capabilities, information for client's websites, information about industry professionals and their business relationships, data integration, and industry news. It operates through the North America and International segments. The North America segment comprises of U.S. and Canada. The International segment includes of the United Kingdom, Spain, Germany, and France. The company was founded by Andrew C. Florance and Michael R. Klein in 1987 and is headquartered in Washington, DC.