Georgia Property Taxes

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Hi.  I have been looking to purchase some investment properties in Georgia and I am not sure what to assume on Property Taxes.  From what I have seen, there is a common approach in which Assessed Values are determined as 40% of the Fair Market Values.  Milage rates are high but overall taxes are low due to this "40% approach".  Should I be concerned about that 40% approach to disappear and then property taxes to go up?  Many thanks!