70 ILCS 2805/52
In determining the benefit to be received by private property owners as a result of a proposed improvement, the assessing officer, in his or her discretion, may take into account any one or more of the following elements and assign a weight to each: front footage, lot area, lot depth, assessed valuation, number of buildable sites, zoning, highest and best use, acreage, health benefits or a mandate from any governmental agency or a certification from the district's engineer as to the need to construct or install the proposed improvement in order to comply with any existing applicable legislation.
(from Ch. 42, par. 447.16)
(Source: P.A. 85-1137.)