70 ILCS 1570/5
In case the Commissioners of Lincoln Park are unable to agree with the owner or owners of or any persons interested in such adjacent and adjoining lands or interests therein or riparian or other rights appurtenant thereto or are unable to agree upon a boundary line between the lands to be held by the Commissioners of Lincoln Park and the lands to be held or retained by such shore owner in lieu of or as compensation for the release of such adjacent or adjoining lands and interest therein and riparian and other rights appurtenant thereto, or in case any owner is incapable of consenting or his name or residence is unknown or he is a non-resident of the State, proceedings may be had to condemn such lands and interests therein and the right to impose restrictions upon the use thereof and the riparian rights appurtenant thereto according to the provisions for the exercise of the right of eminent domain under the Eminent Domain Act .
70 ILCS 1570/5