5. Parapet walls extending no more than four feet above the limiting height of the building except as hereinafter provided; and
6. Solar-energy collectors and equipment used for the mounting or operation of such collectors.
B. Places of public assembly in churches, schools and other permitted public and semi-public buildings may exceed height limitations otherwise established by this title; provided, that these are located on the ground floor of such buildings and provided that for each one foot by which the height of such buildings exceed the maximum height otherwise permitted in the zone, 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 zone.
C. Elevator and stair penthouses, water tanks, monitors and scenery lofts are exempt from height limitations otherwise established in this title; provided, that no linear dimension of any such structure exceed fifty percent of the corresponding street frontage line.
D. Towers and monuments, cooling towers, gas holders or other structures, where the manufacturing process requires a greater height and grain elevators and silos are exempt from this title; provided, that any structure above the height otherwise permitted in the zone shall occupy no more than twenty-five percent of the area of the lot and shall be at least twenty-five feet from every lot line.
