Main or accessory buildings shall be erected, altered, moved, or maintained in accordance with the maximum height of a building as established in Section 1129.14, except that the following structures may be permitted above the aforesaid limitations:
(a) Institutional Buildings. Only chimneys, church spires, cupolas, domes, towers, flag poles, penthouses, water tanks, radio or television antennas, monuments, and other permitted mechanical appurtenances located upon or constituted as an integral part of a main institutional building may be erected above the height limit specified.
(b) Residential Buildings. Only chimneys, and radio or television antennas, located upon and constituted as an integral part of a main residential building, may be erected above the height limit specified, but are limited to a height not exceeding 75 feet above the finished grade.
(1980 Code 151.39)