§ 137.42 MAINTAINING PUBLIC NUISANCE
   (A)   Any building used in the commission of offenses prohibited by §§ 132.02, 135.07 through 135.14, 136.02, 136.03, or 137.01 through 137.07 or used in the commission of an inchoate offense relative to any of the aforesaid principal offenses, or any real property erected, established, maintained, owned, leased, or used by a streetgang for the purpose of conducting streetgang related activity as defined in the Illinois Streetgang Terrorism Omnibus Prevention Act, ILCS Ch. 740, Act 147, § 10, is a public nuisance.
   (B)   A person convicted of knowingly maintaining such a public nuisance commits a misdemeanor. Each subsequent offense under this section is a class 4 felony and shall be prosecuted under appropriate state statute.
(ILCS Ch. 720, Act 5, § 37-1) Penalty, see § 130.99