§ 193. Frame buildings. No frame building shall be erected or
maintained upon the same lot with a dwelling converted after April
twenty-eighth, nineteen hundred thirty, nor shall any frame building not
occupied on April thirteenth, nineteen hundred forty, as a multiple
dwelling be altered or converted to such use; except that if the walls
of a frame converted dwelling are faced with a veneer of brick and the
entrance story is occupied by not more than one family, such entrance
story may be altered so that it may be occupied by two families.