How reliable is Zillow estimate as a tool to determine a fair market value?I've been tracking the Zillow zestimate as a market reference for our house, but I've noticed a steep decline in value, especially during the last month. So, I'm wondering what are the market trends in my area as well as the parameters that Zillow applies in order to estimate the value of a property and how accurate it is as a tool to do so... Question refers to 4972 W Calle Don Alberto, Tucson, AZ 85757December 10 200900YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.