20 ILCS 805/805-235
The Department has the power to do and perform each and every act or thing considered by the Director to be necessary or desirable to fulfill and carry out the intent and purpose of all laws pertaining to the Department, including the right to rehabilitate or sell at public auction buildings or structures affixed to lands over which the Department has acquired jurisdiction when in the judgment of the Director those buildings or structures are obsolete, inadequate, or unusable for the purposes of the Department and to lease those lands with or without appurtenances for a consideration in money or in kind for a period of time not in excess of 5 years for the purposes and upon the terms and conditions that the Director considers to be in the best interests of the State when those lands are not immediately to be used or developed by the State. All those sales shall be made subject to the written approval of the Governor. The funds derived from those sales and from those leases shall be deposited in the State Parks Fund, except that funds derived from those sales and from those leases on lands managed and operated principally as wildlife or fisheries areas by the Department shall be deposited in the Wildlife and Fish Fund.
20 ILCS 805/805-235