20 ILCS 3105/3
As used in this Act, unless the context otherwise requires:
"Board" means the Capital Development Board.
"State agency" means and includes each officer, department, board, commission, institution, body politic and corporate of the State and any other person expending or encumbering State or federal funds by virtue of an appropriation or other authorization by the General Assembly or federal authorization or grant. Except as otherwise expressly authorized by the General Assembly, the term does not include the Department of Transportation, the Department of Natural Resources, or Environmental Protection Agency, except as respects buildings used by the Department or Agency for its officers, employees, or equipment, or any of them, and for capital improvements related to such buildings. Nor does the term include the Illinois Housing Development Authority, the Illinois Finance Authority or the St. Louis Metropolitan Area Airport Authority.
20 ILCS 3105/3