Every person, or the agent thereof, owning any building which is used for commercial purposes shall, within thirty (30) days after the effective date hereof, and within thirty (30) days after the completion of any new building built for a commercial purpose, place the number of its street address on the front of the building in such a manner that the police, fire department and other persons responding to an emergency can readily locate the building. The number shall be three inches (3") high, or higher. (Ord. 420, 2-11-1992; amd. Ord. 721, 2-8-2011)