Zillow ExternalThis site is an online real estate database company that allows you to search for residential real estate for sale and for rent, it provides information on real estate agents, provides information on home loans, and allows you to list a property. Zillow Research produces home value reports and metrics for the nation and over 130 metropolitan statistical areas, having recently added census data. Zillow Research provides reports that identify market trends including five and ten year annualized change. Zillow developed an automated valuation model (AVM) that provides information on housing wealth.