Why did home values in Louisville, KY fall drastically in May 2011 and then rise again sharply?It seems to me like the Zestimate for every home I have looked at on Zillow.com in the Louisville, KY area fell sharply in May 2011 and then rose again immediately following that. What does this represent? If it is a glitch in the valuation algorithm why not simply interpolate those values so that things look more reasonable?December 01 2011 - Belknap00YesReport 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.