35 ILCS 120/5g
Except as to any sale had by virtue of a judgment of foreclosure in accordance with Article XV of the Code of Civil Procedure, whenever any real estate has been or is sold at a judicial sale or a sale for the enforcement of a judgment and such real estate is then subject to a tax lien or notice of tax lien in favor of the Department, as hereinbefore provided, and which is junior or inferior to the lien so enforced or foreclosed by or through that sale, the right to redeem in any manner under or by virtue of such tax lien or claim for tax lien from such sale or from the lien so foreclosed or enforced terminates at the end of 12 months from the date upon which there is filed for record in the office of the recorder for the county in which the lands so sold are situated, if such lands are unregistered, or in the office of the Registrar of Titles for such county, if such lands are registered, a certified copy of the original or duplicate recorded or registered certificate of such sale, such certified copy being endorsed by the Director of Revenue showing service of a copy of such certificate upon him or her, and upon such service it shall be the duty of such officer to make such endorsement. Service may be by United States registered or certified mail.
35 ILCS 120/5g