At the conclusion of the hearing, the corporate authorities shall find and declare by ordinance that written protests, filed and not withdrawn prior to the conclusion of the hearing, represent one of the following:
If the number of written protests filed and not withdrawn is the number described in subdivision (b) of this Section, the corporate authorities shall abandon any further proceedings on the question of formation of the proposed zone.
If the number of written protests filed and not withdrawn is the number described in subdivision (a) of this Section, the corporate authorities may find and declare by ordinance the establishment of the zone as described in the ordinance.
65 ILCS 90/11