My home's value plunged $25k overnight, and the history is now adjusted $25k as well. What happened?

Profile picture for robindm
I see my home's estimated value every day on Mint.com (it pulls from Zillow) and now Zillow reports my home is worth $25k less than it was worth yesterday. It adjusted the history, too - it says a few months ago the home was worth $120k, but a few months ago (in reality), Zillow was saying $145-150k. How can Zillow go back and edit the history when I view this every single day? Other homes in the sub had a similar adjustment. What happened?
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June 22 2011 - Duncanville
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Answers (4)

Profile picture for goldbedr
I don't buy this answer that is being given. All of the houses in the area were selling at the earlier Zillow estimates. If they were overvalued, they'd have been selling at a lower value than the Zillow estimate. 

If they're overvalued, and people overpay at that overvalue, that doesn't mean they're overvalued...it means that's what people are willing to pay, and thus their actual value. 
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July 06 2011
Profile picture for goldbedr
The same has happened to me, and I am furious about it. 

There is no note on the page to show someone who is looking at home values that changes were made. It appears that I bought my house for much, much more than it is worth.

All of the sales in the neighborhood have been around the previous zillow prices, because those are the actual purchased and perceived values. 
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June 23 2011
Profile picture for robindm
Well, that stinks. I bought my home in part based on Zillow's value of it, and that has changed retroactively back even before I bought it.
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June 23 2011
Profile picture for SoCal Appraiser

Zillow updated their data, if it was higher before, it was over-valued. Now is the more correct Zestimate.

More here...

http://www.zillow.com/wikipages/Zestimate-Improvements/

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June 22 2011
 

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