CoStar Group acquired LoopNet, combining to become the largest provider of commercial real estate data and marketing services. The merger combines LoopNet's large online marketplace with CoStar's extensive research team and property database tracking over 3 million commercial properties. CoStar users now have access to significantly more listings for sale, lease, and other property types in major markets like Chicago than previous LoopNet premium members due to CoStar's larger inventory of researched property data.