In this subsection:
"Baseline building code" means the edition of the International Building Code, including Appendix G, first published by the International Code Council during the current year or preceding 9 calendar years with the least restrictive provisions for structural design.
"Baseline existing building code" means the edition of the International Existing Building Code first published by the International Code Council during the current year or preceding 9 calendar years with the least restrictive provisions for structural design.
"Baseline residential code" means the edition of the International Residential Code for One- and Two-Family Dwellings first published by the International Code Council during the current year or preceding 9 calendar years with the least restrictive provisions for structural design.
"Residential building" means a single-family home or a dwelling containing 2 or fewer apartments, condominiums, or townhouses.
"Structural design" means the capacity of a newly constructed structure or altered or repaired existing structure, including its foundation, to withstand forces, including, but not limited to, dead loads, live loads, snow loads, wind loads, soil loads and hydrostatic pressure, rain loads, and earthquake loads, and to resist flood damage.
This subsection is a limitation under subsection (i) of Section 6 of Article VII of the Illinois Constitution on the concurrent exercise by home rule units of powers and functions exercised by the State.
20 ILCS 3105/10.18