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Why did the zestimates (including 5yr history) change by over 50% over the past 2months?(baltimore)

I have been tracking a house's zestimate and have been getting an email to that effect every 4 weeks or so.  up through July, the estimates were somewhat stable (varying by up to 10% in either direction), then, over the past couple of months, not only did the zestimate shoot up by ~50%, the history of the zestimate was also changed by a similar percentage!

here is what i have in my email for the price:
9/05/12 $524k
8/13/12 $440k
7/18/12 $357k
6/22/12 $350k
5/27/12 $342k
5/01/12 $330k

but here is what the history now says the zestimates were:
7/31/12 $662k
6/30/12 $655k
5/30/12 $648k
4/30/12 $643k

this really makes me completely distrust the zestimate to be even REMOTELY relevant to anything...

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September 06 2012 - Otterbein
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