Before the adoption of the plan or any part thereof, or any amendment, extension or addition thereto, the Planning Commission shall hold at least one public hearing thereon; notice of the time and place of which shall be given not less than 15 days prior to such hearing by one publication in a newspaper of general circulation in the city and by registered or certified United States mail to each public utility company operating within the division of the city affected.
(Prior Code, § 5.205)