Please explain in detail the ``algorithms'' you use to calculate zestimates.My house is valued at 25K lower than the exact same property down the street. And the latter has increased in zestimate terms as mine has declined by your measure. I know mine is worth significantly more than your site estimates having had it appraised recently for a refi, so it appears you're not going to the same ``well'' for information on comparable listings. While I know conditions have little to do with your calculations, I also know the comparable house on my block hasn't been renovated in about 40 years, while mine was very recnetly. You prompt for the owner to provide additional information. Any time I have the estimate seems to come in lower. Please explain in exact detail ALL the information you use to compile listings and WHY there are discrepancies. Some of the answers I've seen given in the past appear dileberately opaque. If you say you use empirical data, let's see it. Saying you use algorithms doesn't explain it properly to uninitiated. What are the data points you use? Do you use the same data points for all comparable properties? It doesn't look like you do? If not, why not? And if not, what's the true value of a zestimate? Many thanks. March 28 2013 - Greenwood00YesReport 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.