I would hire a tax grievance company to challenge the taxes. As a matter of fact, I have done this in the past, on my own property. The know the deadlines and file all the necessary paperwork for you. If you are declined or offered a very small reduction, as most people are in the first round, they go to small claims court for you. Most of them charge 50% of your first year's savings, which is well worth it. They are generally successful in reducing the taxes.