65 ILCS 5/11-15-1
The corporate authorities may provide, by ordinance, that any map, plat, or subdivision of any block, lot, sub-lot, or part thereof, or of any piece or parcel of land, shall be submitted to the corporate authorities, or to some officer to be designated by them, for their or his approval. In that case no such map, plat, or subdivision shall be entitled to record in the proper county, or have any validity until it has been so approved. If any municipality has adopted a subdivision ordinance pursuant to Division 12 of Article 11 of this code, as heretofore and hereinafter amended, all subdivision plats shall be submitted for approval and approved in the manner provided in such ordinance. Until approved by the corporate authorities, or such officer designated by them, no such map, plat or subdivision plat shall be entitled to record in the proper county, or have any validity whatever.
65 ILCS 5/11-15-1