735 ILCS 5/13-118
No action based upon any claim arising or existing more than 40 years before the commencement of such action shall be maintained in any court to recover any real estate in this State or to recover or establish any interest therein or claim thereto, against the holder of the record title to such real estate when such holder of the record title and his or her grantors immediate or remote are shown by the record to have held chain of title to such real estate for at least 40 years before the action is commenced, unless such claimant, by himself or herself, or by his or her attorney or agent, or if he or she is a minor or under legal disability, by his or her guardian, trustee, either parent, or any other person acting in his or her behalf shall within 40 years after the claim upon which such action is based arises, file in the office of the recorder of the county wherein such real estate is situated, a verified statement definitely describing the real estate involved, the nature and extent of the right or interest claimed, and stating the facts upon which the same is based. However, the holder of the record title to such real estate shall not be entitled to the protection of Sections 13-118 through 13-121 of this Act if the real estate is in the adverse possession of another.
For purposes of this Section an unborn or unascertained person may be a claimant and a verified statement may be filed on his or her behalf as provided in this Section.
For the purposes of Sections 13-118 through 13-121 of this Act, any person who holds title to real estate by will or descent from any person who held the title of record to such real estate at the date of his or her death or who holds title by judgment or order of any court, or by deed issued pursuant thereto, i. e., by trustee's, trustee's in bankruptcy, conservator's, guardian's, executor's, administrator's, receiver's, assignee's, master's in chancery, or sheriff's deed shall be deemed to hold chain of title the same as though holding by direct conveyance.
735 ILCS 5/13-118