How are Zestimates created?The huge recent overnight drop in my property's Zestimate was created at the exact time that a mortgage appraiser (who knew nothing about this part of the country) appraised my house. I have withdrawn my mortgage application for this and other reasons of their incompetency. Please explain why Zillow would instantly have access to this appraisal, and then instantly devalue this property? This seems like an invasion of privacy.October 20 2012 - Lower Merion Township00YesReport 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.