What would generate a HUGE sudden drop in value(2/3) when no changes have occured?

Profile picture for JulzBro
Particulary, 1225 Oakwood Ave, Norristown PA, 19401, was devaluated in june, due to a discounted sale; meantime, we have been thouroughly rehabbing the house, and the zestimate started reflecting that. However in Dec 2011 the Z-Estimate has been slashed to 1/3 of the Nov 2011 value, when in fact, there has been tremedous progress on the rehab, the house passed 2 major inspections and we are well on the way of completing the renovation. Thank you!
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January 11 - Norristown
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Profile picture for wetdawgs
Zillow does not have the ability to know when someone is rehabbing the home.  The two numbers contributing to the calculations reflecting condition would be tax assessment and sales prices.   So, the home's Zestimate is most likely responding to the sales' price of $32k in April 2011.    The question I (not a Zillow employee) would have when looking at the Zestimate graph is why did the Zestimate almost triple between Aug and Nov.  Now it is coming back in line with the sales price.

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January 11
 

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