50 ILCS 845/5-15

(a) If a development project provides automobile parking voluntarily, then a unit of local government may impose on the development project requirements for parking spaces to be made available for car-share vehicles, for parking spaces to be shared with the public, or for parking spaces to be made available only for a fee. A unit of local government may not require voluntarily provided parking to be provided free of charge. (b) Section 5-10 does not apply to minimum automobile parking requirements if the requirements conflict with a contractual agreement or approved site plan with the unit of local government that was executed or approved on or before the effective date of this Act. However, Section 5-10 applies to an amendment or extension to the contractual agreement or approved site plan if the amendment or extension increases automobile parking requirements. (c) A development project may voluntarily build additional parking that is not shared with the public. (d) Nothing in this Act shall be interpreted to prevent a unit of local government from regulating access to on-street parking. (e) Nothing in this Act prevents a unit of local government from enacting or enforcing local laws that establish a maximum parking requirement. (f) Nothing in this Act prevents a unit of local government from enacting or enforcing local laws that establish a minimum parking requirement for bicycles, including electric-assisted bicycles.