320 ILCS 30/4
In the case of each tax deferral and recovery agreement entered into between the collector and the owner or owners of qualifying property, the collector shall forthwith cause to be recorded with the recorder of the county in which the qualifying property is located a statement of their action which shall constitute a lien upon the real estate and improvements thereon covered by such agreement for such taxes as have been deferred under the provisions of this Act, plus accrued interest as provided for by Section 3. In the case of a dwelling unit in a multidwelling building that is owned and operated as a cooperative, the lien shall be upon only that portion of the real estate that constitutes a homestead exemption occupied by the taxpayer. The statement shall name the owner or owners and shall include a description of the real estate adequate for identification. The filing fee for such statement shall be paid by the county or other unit of local government and shall be added to and become a part of the deferred taxes due.
320 ILCS 30/4