You are right!
An appraiser from our bank assessed our property very low, using $30/sf for adjustment on the living area, in order for us to pay a higher down payment to the bank, therefore reducing the risk to the bank.
The tax office assessed our property first time at $122/sf. I argued with them that they took the most expensive properties for our comps and that they didn't even consider properties in our subdivision. They lowered to $113 as to be their final reduction. They greatly exaggerated the adjustments for the comps and therefore came up with a higher number for our house. I asked for the regulations they follow in order to calculate the adjustments and they said that this is the way they always do! But the average market price in our area is $85-90/sf.
I will present my case at a hearing. Good luck with lowering the number! Our politics in our small town are so corrupt and their goal is not to reduce my property taxes.

