If from the facts presented to the Commission at the public hearing or by investigation, the Commission finds the zone change proposal or any modification or portion thereof are warranted, the Commission shall recommend by the affirmative vote of not less than three members of the Commission such zone change to the City Council by formal resolution at the next available City Council meeting following completion of its action. The resolution shall recite, among other things, the reasons which, in the opinion of the Commission, make the approval of the change of zone necessary to carry out the general purpose of this title. Such decision shall be filed with a permanent file and shall be open to public inspection. The Commission shall transmit such resolution to the City Council, together with a copy of all pertinent information contained in the Commission's permanent file.