Why have historical index values for condos in Charleston SC (zip 29401) changed dramatically.Last month, the October 2010 index value was $393,000. This month the October 2010 index value is $415,000. More importantly, relationships across time dramatically different--with prices now well down over 12 months rather than significantly up. Was an error introduced, or was an error corrected? December 13 2011 - Charleston00YesReport 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.