All exposed exterior surfaces shall be maintained free of broken or cracked glass, loose shingles or loose or crumbling stones or bricks, loose shutters, railings, aerials, excessive peeling paint or other conditions reflective of deterioration or inadequate maintenance. Said conditions shall be corrected by repair or removal. All exposed exterior surfaces of structures not inherently resistant to deterioration shall be coated, treated or sealed to protect them from deterioration or weathering. Wood, masonry or other exterior materials that will naturally resist deterioration do not have to be treated, but must be otherwise maintained in a sound, secure workmanlike manner. Exterior surfaces that have been painted or otherwise coated must be maintained in a neat, serviceable manner. Floors, walls, ceilings, stairs and fixtures of buildings shall be maintained in a manner so as to prevent the collapse of the same or injury to the occupants of the building or to the public.