I hate raising taxes as much as anyone but allowing values to stay at 1970's rates seems absurd to me. (although great for you!)
They raise taxes. The property base number remains the same. The tax rate (millage) goes up.
That's why I said re-assessments are by law to be revenue neutral. If property values go up 10% the gov't doesn't automatically just get 10% more revenue. That would give the gov't an incentive to over-estimate.
Since it must be revenue neutral, any reassessment is about the relative value of my property to yours, not about finding a windfall for politicians to spend.