70 ILCS 3615/3.03
Each Director shall hold office for a term of 5 years, and until his successor has been appointed and has qualified. A vacancy shall occur upon resignation, death, conviction of a felony, or removal from office of a Director. Any Director may be removed from office (i) upon concurrence of not less than 11 Directors, on a formal finding of incompetence, neglect of duty, or malfeasance in office or (ii) by the Governor in response to a summary report received from the Executive Inspector General in accordance with Section 20-50 of the State Officials and Employees Ethics Act, provided he or she has an opportunity to be publicly heard in person or by counsel prior to removal. Within 30 days after the office of any member becomes vacant for any reason, the appointing authorities of such member shall make an appointment to fill the vacancy. A vacancy shall be filled for the unexpired term.
Whenever a vacancy for a Director, except as to the Chairman or those Directors appointed by the Mayor of the City of Chicago, exists for longer than 4 months, the new Director shall be chosen by election by all legislative members in the General Assembly representing the affected area. In order to qualify as a voting legislative member in this matter, the affected area must be more than 50% of the geographic area of the legislative district.
70 ILCS 3615/3.03