50 ILCS 20/4a
A Public Building Commission may be created for the limited purpose of constructing, acquiring, enlarging, improving, repairing or replacing a specific public improvement, building or facility or a special type or class of public improvements, buildings or facilities. The provisions of Section 4 of this Act shall apply to the creation of a Public Building Commission under this Section, except that the resolution adopted by the municipality or county board and the proposition shall specify the limited purpose for which such Public Building Commission is to be created. The provisions of Section 4 authorizing any municipal corporation any part of whose area of jurisdiction lies within the territorial limits of that county seat to join in the organization of the Public Building Commission in the manner set forth in that Section shall not be applicable to a Public Building Commission created under this Section. The county board of any county that has created a public building commission for a limited and specific purpose may expand that purpose by resolution.
The purpose of a public building commission created by the county board of any county may not be expanded until the question of expanding the purpose of the public building commission has been submitted to the electors of the county at a regular election and approved by a majority of the electors voting on the question. The county board must certify the question to the proper election authority, which must submit the question at an election in accordance with the Election Code.
The election authority must submit the question in substantially the following form:
Shall the county board be authorized to expand the purpose of the (insert name of public building commission) to include (insert the purpose or purposes)? The election authority must record the votes as "Yes" or "No".
If a majority of the electors voting on the question vote in the affirmative, the county board may thereafter expand the purpose of the public building commission.
50 ILCS 20/4a