The district height limitations stipulated elsewhere in this chapter may be exceeded, but such modification shall be in accord with the following:
Architectural projections. Architectural projections, such as spires, belfries, parapet walls, cupolas, domes, flues and chimneys are exempt from the height limitations of this chapter.
Special structure height limitations. 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.
Essential services height limitations. Essential services, utilities, water towers, and electric power and communication transmission lines are subject to conditional use permit.
Communications structures height restrictions. Communications structures, such as radio and television transmission and relay towers, aerial and observation towers shall not exceed in height three times their distance from the nearest lot line.
Agricultural structures height restrictions. Agricultural structures, such as barns, silos and water windmills, shall not exceed in height twice their distance from the nearest lot line.
Public facilities height restrictions. Public or semipublic facilities, such as schools, churches, hospitals, monuments, sanitariums, libraries, governmental offices and stations, may be erected to a height of 60 feet, provided that all required yards are increased not less than one foot for each foot the structure exceeds the district's maximum height requirement.
The yard requirements stipulated elsewhere in this chapter may be modified as follows:
Uncovered stair restrictions. Uncovered stairs, landings and fire escapes may project into any yard, but not to exceed six feet and not closer than three feet to any lot line, and must be eight feet or more above ground.
Architectural projection restrictions. Architectural projections, such as chimneys, flues, sills, eaves, belt courses and ornaments, may project into any required yard (setback requirements), but such projection shall not exceed two feet.
Cul-de-sac and curve restrictions. Residential lot frontage on culs-de-sac and curves may be less than 60 feet, provided that the width at the building setback line is at least 60 feet and the street frontage is no less than 45 feet.
Essential services exemptions. Essential services, utilities, electric power and communication transmission lines are exempt from the yard and distance requirements of this chapter.
Street yard restrictions. The required street yards may be decreased in any residential or business district to the average of the existing street yards of the abutting structures on each side, but in no case less than 15 feet in any residential district and five feet in any business district.