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I was speaking with the powers that be today and allegedly even though they haven't updated the appraisals lately, what they've done is used a multiplier to estimate based on old values. i.e., estimate that a home in Arlington, VA is probably worth 80% of what it was before (I'm just picking numbers, they have more science behind it). So if you had a guy with a house worth 500k 3 years ago, they're going to multiply it by what they think makes sense for the area and use that as a value. That being said, some areas have been updating their tax assessments and if that's available electronically a lot of times the powers that be will use that which helps. The values can definitely be off, but not by any drastic amount.
Have you compared data in areas you know what housing values are?