I have successfully appeal taxes on my properties for some time now. The first and most important part of the appeal is what's on your tax card-request it thru the tax assessor-now divide your land and building assessment by the tax ration- now that you know your tax value proceed to obtain your comp- you need a realtor to help you with this part-bedrooms, finished basement,etc, are very important. The battle is low cost 5-25 dollar depending on your assessment amount.
If you fight back you can win the battle.
Have fun! It's real estate!