Changes and additions. Any subsequent substantial change or addition to the plans or uses shall be submitted for approval to the Village Board, and if, in the opinion of the Village Board, such change or addition constitutes a substantial alteration of the original plan, it shall schedule an additional public hearing, in which event the Village Board shall schedule a notice of public hearing as for the original petition. Following such public hearing, the Village Board shall deny, approve or approve the same subject to any additional conditions and restrictions it may impose.