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Anomalies in pricing

The Z-estimate for my home and others within a few blocks of me show a strange anomaly between Jan 2010 and Jan 2011 in which the estimated values went up by almost a factor of 1.8 when everything else was flat or down.  As soon as I look at houses a 8-10 blocks away, the trends are more normal.  Is there any way to discover what unusual or bad data points went into that estimate?  My motivation is that my assessment went way up also and I think both must be considering some unusual outlier in their algorithm.  There's no way my house was up significantly in value during this time as everything in the area has been flat or slightly down.
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August 09 2011 - Kenmore
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August 10 2011
 
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