Every person owning or acting as agent for or occupying any building or lot in the City shall keep, or cause the sidewalk and right-of-way adjacent to such building or lot to be kept open and free from obstructions, barriers and impediments as described hereinabove; provided however, the Public Works Director or designee may allow a temporary obstruction if such obstruction is removed within twenty-four (24) hours following installation. The Public Works Director or designee shall have the authority to remove obstructions within a notified period of time and, if an emergency exists, may order immediate removal of an obstruction without prior notice.