(a) Bulkheads, elevator penthouses, water tanks, monitors, scenery lofts, towers and monuments, provided no linear dimensions of any such structure exceeds fifty percent of the corresponding street lot line frontage, fire towers, hose towers, cooling towers, gas holders or other structures, where the manufacturing process requires more than fifty percent of the street lot line frontage; provided, however, that all such structures above the heights otherwise permitted in the district shall not occupy more than twenty-five percent of the area of the lot and shall be distant not less than twenty-five feet in all parts from every lot line.
(b) Church spires, belfries, cupolas and domes, monuments, water towers, masts and aerials; parapet walls extending not more than four feet above the limiting height of the building. (Ord. 1973-44. Passed 12-18-73.)