A good article with evidence here by Ryan discussing the accuracy of the zestimates, and how Zillow calculates their success rate based on their updated zestimates once a property sells.

His comment section is full of examples where Zillow adjusts their zestimate to the list price once a property comes on the market, which is a practice Spencer denied on twitter below when discussing their prize winner for best algorithm improvement:

Ryan’s comment section will make you think that it is still an on-going practice for zestimates:


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