765 ILCS 120/3

(765 ILCS 120/3) (from Ch. 30, par. 403)

Sec. 3.

For the purposes of this Act the word "owner" shall include not
only the owner of fee simple title, but also the owner of any other
interest in the land, including, without limitation, a contract purchaser,
a lessee, and a life tenant.  Provided, any conveyance shall bind only the
interest of the grantor, nor shall any conveyance by a party having a limited
interest be made if it violates the provisions of the instrument under which
such grantor holds.

(Source: P.A. 80-584.)