All structures shall not exceed the height requirements established for the zoning district in which the structure is located, except as modified herein. Height limits established in Section 165.13 through 165.18 shall not apply:

1.   To barns, silos, or other farm buildings or structures on farms, provided these are not less than 50 feet from every lot line; to church spires, belfries, cupolas and domes, monuments, water towers, fire and hose towers, masts and aerials; to parapet walls extending not more than 4 feet above the limiting heights of the building.

2.   To places of public assembly such as churches, schools, and other permitted public and semi-public buildings not to exceed six stories or 75 feet, provided that for each foot by which the height of such building exceeds the maximum height otherwise permitted in the district its side and rear yards shall be increased in width or depth by an additional foot over the side and rear yards required for the highest building otherwise permitted in the district.

3.   No bulkheads, conveyors, derricks, elevator penthouses, and water tanks, to monuments, fire towers, hose towers, cooling towers, grain elevators, gas holders or other structures, where the manufacturing process requires a greater height. Where a permitted use requires greater heights than specified, such may be authorized by the Board of Adjustment.