Here is an interesting post on Zillow and their accuracy of the Zestimate
http://www.csmonitor.com/Business/Saving-Money/2015/1114/Are-Zillow-s-home-price-estimates-accurate
I wonder if Spencer’s home had a FloorPlanOnline tour (vs the Matterport tour) how fast it would have sold….sounds like this house has been on the market for some time, which is a bit unusual in Seattle!