Applicants must file a Form PTAX-341, Application for Returning Veterans' Homestead Exemption, with the Chief County Assessment Office. A property tax exemption is like a discount applied to your EAV.If you qualify for an exemption, it allows you to lower your EAV. The exemption is available to owners of single-family homes, condominiums, cooperatives, and apartment buildings with up to six units. The exemption application must be filed yearly. 8. Organizations that have purchased an already exempt property must file an exemption application or the property will be placed back on the tax roll. The sellers and buyers or their agents must complete Steps 1 through. Join us for a workshop to learn about the Cook County Assessor's Office and homeowner exemptions. 2. When are Buyers and Sellers ever exempt from completing a Form 7551? You do not need to fill out an application.