The address coordinator shall give notice to the occupants or owners of buildings which are assigned or reassigned numbers under this system, which notice shall contain the new number or number reassigned to a particular building, and the date on which the new number shall be effective. Within sixty days of such effective date of notice of number assigned or reassigned, the occupant(s) or owner(s) of the buildings shall cause the number to be displayed upon the building or land in such manner as to be visible from the street or road upon which the land or building fronts, and shall remove or obscure from public view any old or previous number not in accordance with the system. The minimum height of numbers to be used shall be three inches and of contrasting color from the basic background. (Ord. 459 § 51 (part), 1991: prior code § 21A-1.130)