35 ILCS 200/21-225: Forfeited tax liens and certificates.

Every tax lien or certificate for property offered at public tax sale, and not sold for want of bidders, unless it is released from tax sale by the withdrawal from collection of a special assessment levied thereon, shall be forfeited to the county, as trustee for the taxing districts, and managed pursuant to Section 21-90. Tax certificates are also forfeited to the county in those circumstances described in subsection (d) of Section 21-310 and subsection (f) of Section 22-40 of this Code.