These are the levies for 2022-23 offering exemptions, or showing which school levies offer NO senior exemption. You can apply online for any of these exemptions through the Cook County Assessor's Office.Eligible senior taxpayers must complete an application and supply proof of age and property ownership. To qualify for the homeowners' exemption, the home must have been the principal residence of the owner as of January 1 of that tax year. Download PDF BOE-266 REV. The senior citizens homestead exemption (35 ILCS.