§ 140. Application of article five. The provisions of this article
shall apply to non-fireproof multiple dwellings erected after April
eighteenth, nineteen hundred twenty-nine, and to such dwellings only.
They shall apply to all such non-fireproof dwellings unless their
application is expressly limited to dwellings of a particular class.
They shall apply in addition to, and not in substitution for, the
provisions of article three. However the provisions of this article
shall not apply to a multiple dwelling three stories or less in height
to be occupied by not more than three families in all, with a maximum
occupancy of two families on each floor in a two story building and one
family on each floor in a three story building, provided however that
all the provisions of article six are complied with, including section
one hundred seventy-a of said article.