Reply #6: actually, they reassess every 10 years

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at least they do everywhere i've owned. so even if there are no comparable sales, they'll still reassess eventually. on the plus side, you can appeal any assessment. on the minus side, if prices are going up, your appeal is against the odds.

also, assessments usually run substantially lower than market prices. they'd rather charge a higher percentage of a lower-than-market amount, rather than a lower percentage of an accurate-to-market amount, because you avoid many more disputes and appeals that way.