In the event of a change of address, the City Planner shall be notified in writing of such change. Any notice required by this chapter to be sent to an applicant or building contractor shall be properly given if sent by regular U.S. mail to the address shown on the application, or, in the event the City Planner has been given written notice of a change of address, to such changed address. Notice may also be given in any other manner reasonably calculated to give the recipient of the notice actual knowledge of its contents.