Florida did a lot with buidling codes after hurricane andrew tore apart Homestead. increased basic standards so things had to withstand a higher windload. any retro fit had to meet the higher standards. the changes were driven by the insurance companies not wanting to pay for high losees again ...

if the tax is 7% then divide the value by 1.07 .

on the other part, it sound like you have Excel format set to 0 digits, change the format to 2 digits and it wont round anymore!