http://www.zillow.com/advice-thread/How-can-I-add-the-original-purchase-to-our-Zestimate/252421/ Zillow Advice | Zillow Real Estate http://www.zillow.com/advice-thread/How-can-I-add-the-original-purchase-to-our-Zestimate/252421/ You can actuallly go to the home, claim and create and 'owners estimate'.  Once you do this, you can choose whether or not you want to make the estimate you create public.  You can also choose to add/edit information.  It won't actually change what is online, but rather publish updated facts that sit beside the public record data. Fri, 03 Jul 2009 19:00:00 GMT http://www.zillow.com/advice-thread/How-can-I-add-the-original-purchase-to-our-Zestimate/252421/ 2009-07-03T19:00:00Z