Yet another industry support service company (See W + R studios and Real Trends above) has sold this month. Homesnap is picked up by by CoStar, a $35 billion commercial data accompany. CoStar has deep experience in operating a real estate portal and, while the company says it will operate differently, it could charge marketing fees to agents and brokers to list on the site as it does in the commercial space with LoopNet. In this instance Zillow most certainly has not only a serious competitor, but the largest competitor it has ever had.