Webproperty owners in the city of chicago are now receiving reassessment notices in the mail. The reassessment notice contains the updated estimated market value of a. Webif the estimated market value is within 10% of what you think your home is worth, it’s unlikely an appeal would change your property’s assessed value enough to. Webif you're one of the thousands of homeowners or businesses that saw your cook county property tax bill skyrocket this year, you can file an appeal. Webthose neighborhoods saw the total assessed value of commercial and residential properties increase by 27% to 38%, according to the cook county.