65 ILCS 5/9-3-42
The corporate authorities by resolution shall direct some officer of such municipality to file a petition in the name of such municipality in any court of competent jurisdiction to foreclose the lien as to the past due assessment, or installment thereof, and cause the real estate against which such assessment, or installment thereof, is levied to be sold to pay the same. As many lots, tracts and parcels of land as may be desired may be joined in one suit so long as the lots, tracts and parcels of land are delinquent for the same assessment or installment thereof constituting liens against the real estate created under this Division 3. Upon filing of the petition, notice shall be given by the clerk of the court addressed "To All Owners, Parties Concerned and Persons Interested" in the described tracts of real estate, setting forth a description of the several tracts of real estate sought to be sold, the pendency of the proceedings, the docket number of the cause, and stating the term of court at which the petition will be heard. The notice shall be published by the clerk of the court in a newspaper published and of general circulation in the municipality where such real estate is situated if there is such a newspaper. Otherwise, such notice shall be published in a newspaper published and of general circulation in the county. Such notice shall be published at least 30 days prior to the date set for the hearing in the cause. The petition and notice shall give the court full jurisdiction of all the parties interested as owner, occupant, lien claimant or otherwise, in the several tracts of real estate described in the petition and notice.
65 ILCS 5/9-3-42