Zillow Advice: Housing Market - Why did zillow down grade their historical estimates of home values? http://www.zillow.com/advice-thread/Why-did-zillow-down-grade-their-historical-estimates-of-home-values/425454/ Zillow Advice | Zillow Real Estate Read the comment regarding ... http://www.zillow.com/advice-thread/Why-did-zillow-down-grade-their-historical-estimates-of-home-values/425454/ Read the comment regarding Zestimate <a href="http://www.zillow.com/wikipages/Zestimate-Improvements/">history on this page......</a> Sun, 11 Dec 2011 06:14:00 GMT http://www.zillow.com/advice-thread/Why-did-zillow-down-grade-their-historical-estimates-of-home-values/425454/ 2011-12-11T06:14:00Z