50 ILCS 20/5
Within 60 days after the filing in the office of the recorder of the resolution or resolutions organizing the Public Building Commission, the presiding officer of the municipality, county seat or county board adopting the original resolution and the presiding officers of the municipal corporations, if any, joining in the organization of the Public Building Commission shall appoint Commissioners in the manner hereinafter provided. All appointments shall be made with the advice and consent of the governing body whose presiding officer makes the appointment.
Within 10 days after the appointment of the commissioners by the respective presiding officers, with the advice and consent of the respective governing bodies, as aforesaid, each of such presiding officers shall transmit to the presiding officer of the municipality, county seat or county board which adopted the original resolution, a certificate of such appointment. The presiding officer of the municipality, county seat or county board shall cause all such certificates of appointment, including a certificate of the appointments made by the presiding officer of the municipality, county seat or county board which adopted the original resolution, to be bound under one cover and filed in the office of the recorder in and for the county. Upon such filing the persons so appointed shall constitute the Board of Commissioners of the Public Building Commission and upon taking the oath of office as hereinafter provided shall be deemed to have qualified and be empowered to exercise the powers and authority prescribed in this Act.
The Board of Commissioners shall in all cases consist of not less than 5 members and in such instances as there may be more than 5 members as herein provided, the Board of Commissioners shall consist of an odd number.
If the county seat or municipality alone organizes the Public Building Commission, the presiding officer of the county seat or municipality shall appoint not less than 5 Commissioners.
If the county board alone organized the Public Building Commission, the presiding officer of the county board shall appoint not less than 5 Commissioners. The Commissioners appointed to that Public Building Commission must be residents of the county in which the Commission is organized.
If any one municipal corporation shall join with the municipality, county seat or county board in the organization of the Public Building Commission then and in such event the presiding officer of the municipality, county seat or county board adopting the original resolution shall appoint 3 Commissioners and the presiding officer of the municipal corporation joining in the organization of the Public Building Commission shall appoint 2 Commissioners.
If 2 or more municipal corporations, in addition to the municipality, county seat or county board adopting the original resolution, shall join with the municipality, county seat or county board in the organization of the Public Building Commission then and in such event the presiding officers of the municipal corporations joining in the organization shall each appoint 1 Commissioner and the presiding officer of the municipality, county seat or county board adopting the original resolution shall appoint such number of commissioners as shall exceed by 1 the aggregate number appointed by the presiding officers of the municipal corporations joining in the organization of the Commission.
The initial terms of such Commissioners shall be for 5, 4, 3, 2 and 1 year, respectively, and in such cases as there may be more than 5 Commissioners the initial terms of Commissioners in excess of 5 Commissioners shall be on a descending scale of 5, 4, 3, 2 and 1 years, as there are Commissioners in excess of 5. The length of the terms of the first Commissioners shall be determined by lot at their first meeting. The initial terms of office of Commissioners who are to hold office for terms of 1, 2, 3, 4 and 5 years, respectively, shall continue until that September 30th which next follows the expiration of the periods of 1, 2, 3, 4 and 5 years, respectively, from the date of the filing of the certificates of appointment in the office of the recorder, as aforesaid, and until their successors are appointed and qualify by taking their oath of office.
At the expiration of the term of each of the Commissioners, and of each succeeding Commissioner, or in the event of a vacancy, resignation, removal or refusal to act, the presiding officer of the municipal corporation, who made that Commissioner's appointment in the first instance, shall appoint a Commissioner, in the manner hereinabove provided, to hold office, in the case of a vacancy occurring for whatever reason, for the unexpired term, or in the case of expiration, for a term of 5 years, and until his successor is appointed and has qualified. Each such appointment shall become effective upon the filing by the presiding officer making the appointment of a certificate of the appointment in the office of the recorder for that county. Any Commissioner may be appointed to succeed himself.
50 ILCS 20/5