65 ILCS 5/11-12-7
The corporate authorities may initiate plans and maps by requesting the plan commission to prepare an official comprehensive plan and recommend the same, or may originate an official comprehensive plan, or a part thereof, or an amendment thereto, and may refer same or suggested changes in an existing comprehensive plan to the plan commission for its consideration and recommendation thereon. No comprehensive plan or amendment thereto shall be adopted that has not been submitted to the plan commission.
The corporate authorities may adopt parts of a comprehensive plan recommended by a plan commission without adopting the entire comprehensive plan as recommended, or may modify or amend portions of a recommended comprehensive plan without a re-reference of same to the plan commission, and may adopt such comprehensive plan, as modified or amended. Such comprehensive plan, when adopted, shall be the official comprehensive plan, or part thereof, of that municipality.
Upon submission by the corporate authorities of any suggested comprehensive plan, part thereof, or amendment to an existing comprehensive plan to the plan commission for consideration and recommendation, the corporate authorities may require a report thereon from the plan commission with its recommendation within 90 days from the date of such submission, and if the plan commission shall fail to make such report within such 90 days, then the corporate authorities may proceed to consider such comprehensive plan, or part thereof or amendment to an existing comprehensive plan, for adoption, including arranging for and holding of a public hearing thereon in accordance with the provisions hereinafter contained in the same manner as if the plan commission had made its recommendation.
On and after the effective date of this amendatory act of 1961, an official comprehensive plan, or any amendment thereof, shall not be adopted by a municipality until notice and opportunity for public hearing have first been afforded in the manner herein provided. Upon submission of a comprehensive plan by the plan commission, or a proposed amendment to an existing comprehensive plan, the corporate authorities shall schedule a public hearing thereon, either before the plan commission or the corporate authorities. Not less than 15 days' notice of the proposed hearing, and the time and place thereof, shall be given by publication in a newspaper of general circulation in the county or counties in which the municipality and contiguous unincorporated territory are located. The hearing shall be informal, but all persons desiring to be heard in support or opposition to the comprehensive plan or amendment shall be afforded such opportunity, and may submit their statements, orally, in writing, or both. The hearing may be recessed to another date if not concluded, if notice of the time and place thereof is publicly announced at the hearing or is given by newspaper publication not less than 5 days prior to the recessed hearing.
Within 90 days after the conclusion of the hearing, the corporate authorities, after consideration of the recommendation of the plan commission and such information as shall have been derived from the hearing, shall either adopt the comprehensive plan or amendment in whole or in part or reject the entire comprehensive plan or amendment. If adopted, the corporate authorities shall enact the ordinance including a map or maps as hereinbefore provided. In adopting an official comprehensive plan, except as herein otherwise provided, the corporate authorities shall be subject to the same limitations as to subject matter as apply to the plan commission. If at the expiration of such 90 days, the corporate authorities have taken no formal action, the comprehensive plan or amendment thereto may thereafter not be acted upon by the corporate authorities without again complying with the conditions of notice and hearing heretofore provided.
No official map, or amendment or addition thereto, shall be ground for rejection of any plat of subdivision or resubdivision by the corporate authorities, if application for final approval of such subdivision or resubdivision is filed with the corporate authorities 15 days or more prior to the date on which the ordinance approving the official map, or amendment or addition thereto, is adopted.
The comprehensive plan or amendment shall become effective upon the expiration of 10 days after the date of filing notice of the adoption of such comprehensive plan or amendment with the recorder of the county. Whenever used in this Section 11-12-7 the words "plans" or "comprehensive plan" shall be deemed to mean and include, where applicable, an official map or maps.
65 ILCS 5/11-12-7