Zillow Advice: Home Selling - Bad Algorithms! http://www.zillow.com/advice-thread/Bad-Algorithms/454459/ Zillow Advice | Zillow Real Estate There are a several problems ... http://www.zillow.com/advice-thread/Bad-Algorithms/454459/ There are a several problems contributing in addition to Zillow's sometimes silly algorithms. &nbsp;The assessor's data on several of the homes in this block looks incorrect - like they never got notice on all the properties of the build-out, or were given incorrect models at the exchange of information from the building or planning department. &nbsp;<br/><br/>Will this get automatically fixed? &nbsp;No. &nbsp;There's no one out there checking but you. &nbsp;First thing to do, is call the Sacramento County Assessor's office at 916- 875-0700&nbsp;or email them assessor@saccounty.net with your parcel (APN) number, address and your thoughts about the footage. &nbsp;You probably have a builder's brochure or fact sheet. &nbsp;Once they correct it, it would still take a while for Zillow to pick it up. &nbsp;The second item is to "claim" your property on Zillow and make adjustments to the property's facts where possible. &nbsp;No guarantee the adjustments will be quick, but that will get you started on the right track. &nbsp;One the bright side, if the Zillow estimate were low by 10-20%, you'd be battling it all the time when talking to buyers, but since its off by 50%, everybody knows its wrong. &nbsp;Good luck! Fri, 10 Aug 2012 06:16:00 GMT http://www.zillow.com/advice-thread/Bad-Algorithms/454459/ 2012-08-10T06:16:00Z