Zillow and Zestimates for Lake Martin Property Values Zillow and Zestimates are simply not accurate and should not be trusted when researching Lake Martin Real Estate values. According to Zillow, most Zestimates are "within 10 percent of the selling price of the home." I could spend all day giving you examples of Zestimates or Guestimates that are over or under property sales prices by huge Continue Reading