Amends the Counties Code, the Township Code, and the Illinois Municipal Code. Provides that, no later than January 1, 2027, each county, township, and municipality shall, by ordinance, allow for adaptive reuse of existing commercial buildings. Provides that adaptive reuse of existing commercial buildings shall be allowed in the county, township, or municipality under the provisions until the county, municipality, or township adopts or amends an ordinance to comply with the provisions. Provides that the adaptive reuse policy adopted under the provisions shall (1) allow the construction of micro units, provided however that no county, township, or municipality shall require a micro unit to be larger than minimum standards for micro units established in the International Building Code; (2) allow for the adaptive reuse of a building to meet the interior environment requirements of the International Building Code; and (3) provide for an exemption to any requirements regarding park dedication or additional off-street parking. Defines "adaptive reuse". Effective immediately.