Probably, it is a bug.The GetDeepComps API is not returning a good data, however it is difficult to note, since some houses are getting good comps and some are not, their locations are close to the others (one quarter mile or one mile apart).You can check the following examples:These below are my claimed homes on Zillow.* The one that on the 91311 Zip code got 1 mile plus comps only (no 1 mile minus comps) and their comps (the comps of the comps) are getting 1 mile minus comps only (no 1 mile plus comps)* The one on 91304 got also as same as above (1 mile plus comps only and no 1 mile minus comps)Those properties used to get the good comps, just a few days ago.November 10 2012 - Chatsworth00YesReport 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.