I stumbled upon this today (here) and it reinforces my general philosophy and strategy toward addressing local real estate values with some quantitative backbone. Here is the conclusion from the report with highlights bolded and my comments in green within the conclusion:
The evidence suggests that property tax revenues are quite responsive to changes in house prices. ( higher property prices generate higher tax revenues) Although it takes several years for house price appreciation to feed through toproperty tax revenues, the long-run elasticity is on the order of 0.4. On average, policy makers are estimated to respond to increasing home prices by reducing effective tax rates (higher prices lower effective tax rates) so as to offset 60 percent of the increase in tax revenue that would have occurred in the absence of a change in the effective tax rate. Institutional features of the property tax, such as delays in bringing assessed values into line with market values (the failure to adjust assessed values in the year-over-year increases in our market values has actually lost the city revenue and also as a consequence failed to deliver the reduction in the effective tax rate mentioned above; this is why assessments are so important and why the argument for keeping legacy assessments is precisely wrong and ill-advised) and caps and limitations on the tax, likely explain the lag between house prices and tax revenues (and may also influence the magnitude of the relationship.)
There is some evidence that the elasticity is smaller for unusually large house price changes, suggesting that policy makers and voters may prefer to avoid unusually large increases in property tax bills. Similarly, there is evidence that during periods of unusually sluggish house price growth the elasticity is larger, suggesting that policy makers and voters may not want tax revenue growth to slow too much. The evidence on the impact of house price depreciation is somewhat mixed, but on the whole there is little evidence that house price declines influence property tax revenues. It appears that policy makers raise effective tax rates to offset declines in tax revenue arising from downward swings in the housing market. (The Amsterdam syndrome: declining house prices raise the effective tax rate). These estimates should be interpreted cautiously because they come from a sample in which most house price declines are relatively small. Thus, the results may not accurately predict the response of local governments to some of the large price declines that have occurred in different parts of the country, given the political difficulty of increasing tax rates under such circumstances.
So the bottom line is that by failing to adjust assessments during the increase in real estate values, we actually cost the city tax revenue during that time and with the subsequent decline, we have raised the effective tax rate. The ideal lose-lose policy scenario.
This is the folly of blindly focusing on high taxes while ignoring market and assessed values.