65 ILCS 90/4

(65 ILCS 90/4) (from Ch. 24, par. 1404) Sec. 4. The corporate authorities shall have the following powers and duties: (a) to exclude any territory proposed to be included in a zone if it finds that the territory will not be benefited by becoming a part of the zone; and (b) to include any additional territory in a proposed zone if it finds that the territory will be benefited by becoming a part of the zone. (Source: P.A. 80-1371.)