Section 4. No Limitations of the Height of Buildings in the City of

Boston shall apply to churches, steeples, towers, domes, cupolas, belfries or statuary not used for purposes of habitation, nor to chimneys, gas holders, coal or grain elevators, open balustrades, skylights, ventilators, flagstaffs, railings, weather vanes, soil pipes, steam exhausts, signs, roof houses not exceeding twelve feet square and twelve feet high, nor to other similar constructions such as are usually erected above the roof line of buildings.