Amends the Property Tax Code, the Community Care for Persons with Developmental Disabilities Act, the Counties Code, and the Community Mental Health Act. Contains provisions validating certain tax levies for community mental health boards. Effective immediately. Senate Floor Amendment No. 3 Deletes reference to: 35 ILCS 200/18-103 new 50 ILCS 835/1.2 55 ILCS 5/5-25025 405 ILCS 20/5 Adds reference to: 50 ILCS 70/5 50 ILCS 70/10 50 ILCS 70/20 50 ILCS 70/25 30 ILCS 805/8.47 new Replaces everything after the enacting clause. Amends the Decennial Committees on Local Government Efficiency Act. Defines "governing board" to mean the governing body of a governmental unit, including, but not limited to, the governing body of a road district. Provides that "governmental unit" means all entities that levy taxes and are also units of local government, as defined in Section 1 of Article VII of the Illinois Constitution, except municipalities and counties (rather than includes all units of local government that may levy any tax, except municipalities and counties). Provides that a highway commissioner of a township road district in a county with a population under 400,000 and the township board of the same township may form a joint committee on local government efficiency (currently, the governmental unit must form a single committee). Makes other changes. Amends the State Mandates Act to require implementation without reimbursement. Effective immediately.