735 ILCS 5/12-152
When a certified copy of a judgment is issued from a circuit court of any county in this State, and levied upon any real estate, the officer making such levy shall execute a certificate thereof and file the same in the office of the recorder of the county in which such real estate is located or in the office of the registrar of titles of such county if the real estate levied upon is registered under "An Act concerning land titles", approved May 1, 1897, as amended. Unless a transcript, certified copy or memorandum has been filed in the office of the recorder or in the office of the registrar of titles of such county, as the case may be, as provided by Section 12-101 of this Act, no judgment or order shall become a lien upon either nonregistered or registered real property until such certificate of levy has been filed as provided in this Section and, if the real property levied upon is registered, a memorial thereof is entered upon the register of the last certificate of title to be affected.
735 ILCS 5/12-152