The clerk shall mail a notice to each owner of a lot or parcel of land within the assessment district advising him of the provisions of Sections 5896.14 and 5896.15 and stating that unless such owner complies with the requirements of such sections all buildings, structures and improvements located upon the lot or parcel will be subject to disconnection from the electric or communication facilities providing service thereto. Such notice shall be mailed at least 15 days prior to the date of commencement of construction and shall be mailed to the owners whose names and addresses appear on the last equalized assessment roll used by the city or as known to the clerk.