But that's because the calculated value of the land+building is increasing, right? The method of calculation might be wrong, but the tax going up isn't because

But that's because the calculated value of the land+building is increasing, right? The method of calculation might be wrong, but the tax going up isn't because the calculation is being arbitrarily changed - it's because one of the inputs is more valuable. At least that's the way it generally works where I live.