140.21 NOTICES.
1.   Any notice required or permitted to be given by the Director or any other City office, division, department or other agency under this chapter to any applicant, operator or owner of an establishment may be given either by personal delivery or by certified United States mail, postage prepaid, return receipt requested, addressed to the most recent address as specified in the application for the permit, or transfer application that has been received by the Director, or any notice of address change that has been received by the Director. Notices mailed as above shall be deemed given upon their deposit in the United States mail. In the event that any notice given by mail is returned by the postal service, the Director shall cause it to be posted at the principal entrance to the establishment.
2.   Any notice required or permitted to be given to the Director by any person under this chapter shall not be deemed given until and unless it is received in the office of the Director.
3.   It is the duty of each owner who is designated on the permit application and each operator to furnish a notice to the Director in writing of any change of residence or mailing address.