Chimneys, cooling towers, elevator bulkheads, fire towers, gas tanks, solariums, steeples, penthouses, stacks, stage towers or scenery lofts, tanks, water towers, ornamental towers and spires, wireless, radio or television towers or necessary mechanical appurtenances may be erected, provided that no tower, other than a church steeple or tower of a public building, shall exceed the height district limitations by more than twenty-five (25) percent. No tower shall be used as a place of habitation or for tenant purposes. No sign, nameplate, display or advertising device of any kind whatsoever shall be inscribed upon or attached to any chimney, tower, tank or other structure which extends above the height district limitations.