How is the Zestimate achieved?Homes in my development are selling at $100K more than my estimate and my neighbors are estimated at close to those amounts.... why is mine so much lower.2101 Keystone Dr., 19440March 02 2011 - Hatfield 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.