Before I put my home on the market as a FSBO, Zillow had it Zestimated@ $269,000. After I interviewed a few sellers brokers and decided to go it alone, I checked the Zestimate again and it was at $202,000. There was no indication that the Zestimate had dropped as per the last 30 days notice and when I contacted Zillow support they informed me that their calculation factors change. They would not tell me why a $60,000 plus drop in a week or why that drop was not indicated as such on their site. Something is fishy here...