30 ILCS 561/15

Disclosure must be made by a written statement filed with the appropriate State agency or unit of local government contemporaneously with the execution of the agreement or understanding. Each individual and entity must be disclosed by name and address and by a description of the interest held, including the percentage interest in the land held by the individual or entity. The statement must be verified, subject to penalty of perjury, by the individual who holds the greatest percentage of beneficial interest in the land.