CoStar Group, Inc. is a leading provider of commercial real estate information, analytics and online marketplaces. The company was founded by Andrew Florance in 1987, who had the vision of fundamentally changing the way commercial real estate professionals access, use and share information. The company is publicly traded on the Nasdaq under the ticker CSGP.

CoStar Group is headquartered in Washington DC, and has offices throughout the United States, Europe and Canada – operating in a total of 368 markets. Under Florance’s leadership, the company has invested more than $1 billion to create the industry’s first, and largest, independent CRE research operation. Every day, the CoStar research team discovers and verifies information on $1 trillion of potential real estate transactions – and tracks billions of dollars worth of completed deals.

At the core of CoStar Group’s business is a detailed database of commercial properties — size, tenants, photographs and rents. Recently, the company expanded into the residential space by acquiring Apartments.com and ForRent.com.

CoStar Group has developed a reputation for using aggressive litigation and PR tactics against its rivals – evident recently by Florance saying that “Zillow is no longer a relevant player,” upon the demise of Zillow Offers. He went on to say, “We’re about attracting the homebuyers, not the voyeur checking out the inside of their Tinder date’s house.”