Illinois Statutes Chapter 310. Housing § 67/40. Nonresidential development as part of an affordable housing development

(a) An affordable housing developer who applies to develop property that contains nonresidential uses in a nonresidential zoning district must designate either at least 50% of the area or at least 50% of the square footage of the development for residential use. Unless adjacent to a residential development, the nonresidential zoning district shall not include property zoned industrial. The applicant bears the burden of proof of demonstrating that the purposes of a nonresidential zoning district will not be impaired by the construction of housing in the zoning district and that the public health and safety of the residents of the affordable housing will not be adversely affected by nonresidential uses either in existence or permitted in that zoning district. The development should be completed simultaneously to the extent possible and shall be unified in design.

(b) For purposes of subsection (a), the square footage of the residential portion of the development shall be measured by the interior floor area of dwelling units, excluding that portion that is unheated. Square footage of the nonresidential portion shall be calculated according to the gross leasable area.