Structurally unsound, loose, dangerous, crumbling, missing, broken,
rotten or unsafe exterior portions of buildings or structures, including
but not limited to porches, landings, balconies, stairways, handrails,
steps, walls, overhangs, roofs, fences, supporting members, timbers,
abutments, fire escapes, signs or loose, crumbling or falling bricks,
stones, mortar or plaster.