The following regulations govern the height of all main and accessory buildings constructed in a U4 retail district.
(a) No building constructed in a U4 retail district shall exceed a maximum height of 35 feet.
(b) Chimneys, domes, elevator penthouses, skylights, spires, ventilators, water towers, heating or cooling units or similar structures, or other necessary appurtenant features usually carried above roofs of structures permitted in each respective district, when erected upon and as an integral part of a building, and if such structures are not used for human occupancy, or storage, may be erected above the height limit specified in subsection (a) hereof, but in no case shall such feature exceed 10 feet above the maximum permitted in the district.