Why would a home in an area of increasing value have a 15% decrease in a single month?I recently look at my home on Zillow and noticed that the Zestimate included a 15% decrease for the month of May 2011. The town I live in has been experiencing an upward trend (albeit slight) but there appears to be no reason for such a dramatic change in estmate. I know there is are signficant assumptions utilized but this makes no sense and can't be good for the perceived value of the home. Historically the home has followed the towns trend but now has gone off the wire. What would cause this?September 01 2011 - Weston00YesReport 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.