The administration building or any building of a municipality or any political subdivision of government, including any department or agency thereof, and including a firehouse and its equipment, but excluding, however, any building, facility or area used in any way for the storage and maintenance of vehicles, mechanical equipment or materials; the business office or administrative building of any public utility, including a telephone exchange and any building housing the equipment used in connection with the services furnished by such utility, provided that the same does not cause noise, vibration, smoke, dust or noxious odors, but excluding any building facility or area used in any way for the generation, manufacture, transmission or storage of steam, electricity, gas, water, petroleum products or derivatives, vehicles, mobile mechanical equipment or materials used in connection with the business of such utility, provided that the architecture of buildings constructed or altered for such use provided in this subsection shall be conservative and dignified and in keeping with the use and character of the neighborhood.