Duplicate or Overpayment Refund. The Portal consolidates information and delivers Cook County taxpayers a one-stop customer service website.Only taxing districts that collected and received personal property taxes for the 1977 tax year (1976 for Cook County) are eligible to receive PPRT payments. Property tax exemptions are savings that contribute to lowering a homeowner's property tax bill. The most common is the Homeowner Exemption. This tax is imposed on the retail purchase of tangible personal property titled or registered with the State of Illinois to an address located in Cook County. Cook County Treasurer's Office 118 North Clark Street, Room 112 Chicago, Illinois 60602 (312) 443-5100 If your domicile contains more than one dwelling unit, you will still be liable for any personal property you own in the rental units. 12a Amount of personal property included in the purchase. The optional method allows you to deduct the mortgage interest and state and local real property taxes reported on Form 1098, Mortgage Interest Statement.