The district height limitations stipulated elsewhere in this chapter may be exceeded, but such modifications shall be in accord with the following:
A.
Architectural projections such as spires, belfries, parapet walls, cupolas, domes, flues, and chimneys, are exempt from the height limitations of this chapter.
B.
Special structures, such as elevator penthouses, gas tanks, grain elevators, scenery lofts, radio and television receiving antennas, manufacturing equipment and necessary mechanical appurtenances, cooling towers, fire towers, substations, and smokestacks, are exempt from the height limitations of this chapter.
C.
Essential services, such as utilities, water towers, electric power, and communications transmission lines, are exempt from the height limitations of this chapter.
D.
Communications structures, such as radio and television transmission and relay towers, aerials, and observation towers, shall not exceed in height three times their distance from the nearest lot line.
E.
Agricultural structures, such as barns, silos, and windmills, shall not exceed in height twice their distance from the nearest lot line.
F.
Public or semipublic facilities, such as schools, churches, hospitals, monuments, sanitariums, libraries, government offices, and stations, may be erected to a height of 60 feet, provided all required yards are increased not less than one foot from each foot the structure exceeds the district's maximum height requirement.