N.Y. Multiple Dwelling Law § 193

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