I have found another Zestimate that defies gravity that I would like to share with you.
The upper line in the chart below is the Zestimate of the subject home as a function of time from about the beginning of 2007 to the present. The lower lines are the prices for homes in the same zip code and the town. The two latter lines seem to be very closely correlated with each other and are moving in a rational manner. The green dot with the "S" is placed at the date and value of the last sale of the property in 2010.
|Property A, version 1|
|Property A, version 2|