Amends the Property Tax Code. Provides that, from assessment year 2025 through assessment year 2030, in Bremen, Bloom, Rich, and Thornton townships in Cook County, commercial and industrial property shall be assessed at the same level of assessment as residential property. Provides that, beginning with assessment year 2031, Cook County may establish a sliding scale with respect to the statutory level of assessment for commercial and industrial property in those townships that allows those properties to be subject to the same level of assessment as other commercial and industrial property in the county. Preempts the exercise of home rule powers. Effective immediately.