35 ILCS 200/27-87
A municipality may propose a special service area as provided in this Law for the purpose of providing improvements to any one or more buildings if the improvements are required by municipal ordinance in order to protect the health and safety of workers, tenants, and visitors in the buildings; provided that if the owners of 100% of the number of lots, tracts, and parcels of the real estate that are to be subject to the tax file a petition with the clerk of the municipality agreeing with the establishment of a special service area, then the corporate authorities of the municipality may proceed with the establishment of the special service area. If a petition is not filed or contains an insufficient number of signatures, the corporate authorities of the municipality may not proceed further, and the same establishment of a special service area shall not again be initiated for a period of one year.
35 ILCS 200/27-87