How do you determine the Estimated Value of properties on your site?

We use a commercial grade automated valuation model (AVM) which is based on public records data to determine estimated home values for properties. This is a highly ranked AVM, but like all AVM's it is only as good as the public record data available and does not take into account property condition and other factors which may affect the value. An AVM is no substitute for a professional opinion of value, based on knowledge of the local market and condition of the property, which is best provided by a Realtor(R) or appraiser.