Before the city suspends or revokes a registration or imposes the penalties set forth in BMC 6.15.150, an attempt shall be made to give the owner or landlord a written notice by personal service or by certified mail, return receipt requested, stating the existence of a violation, that enforcement action is contemplated, and that such person shall have a specified period of time in which to correct the violation. [Ord. 2015-03-005 § 1].