620 ILCS 5/75
The Department shall have the authority to determine the charges or rental for the use of any properties and the charges for any service or accommodations under its control, by virtue of the provisions of Section 72, and the terms and conditions under which such properties may be used; provided that in all cases the public is not deprived of its rightful, fair, equal and uniform use of such property. Charges shall be reasonable and uniform for the same class of service and established with due regard to the property and improvements used and the expenses of operation to the State. The State shall have and the Department may enforce liens as provided by law, for repairs to or improvement or storage or care of any personal property, to enforce the payment of any such charges.
620 ILCS 5/75