Roof-level features such as spires, belfries, cupolas, or domes
not used for human habitation, chimneys, ventilators, skylights, parapet
walls, cornices, solar energy systems, green or blue roof systems,
water tanks or necessary mechanical appurtenances usually located
on the roof level shall be excluded from calculating height. Flagpoles,
monuments, transmission towers and cables, radio and television antennas
or towers, and similar structures shall also be excluded from the
height limits of this section but may otherwise be regulated in this
chapter. Such features, however, shall be erected only to such height
as is necessary to accomplish the purpose for which they are intended.
No advertising device of any kind whatsoever shall be inscribed upon
or attached to that part of any chimney, tower, tank or other structure
that extends above the height limitations.