Zillow’s system is seriously flawed. My across the street neighbor sold their house for $584,000. My house is the mirror image of their house, built the same month by the same builder. We have more upgrades than the land now has our house valued at $545,000. I emailed them and made them aware of the issue and their response was a stock, “ I understand that it can be frustrating to see a home that is comparable or of lesser value with a higher Zestimate. While the algorithm does look at comparable homes, it draws examples from a much wider range than a neighborhood street or block. Each property has its own unique Zestimate based on the data available for that home. Any differences in data between two homes can produce differences in Zestimates” Zillow is tremendously flawed