Sections twelve to fifteen of this Act shall apply—
as if references in those sections to a house which, or a part of which, is let in lodgings or which is occupied by members of more than one family included references to any such building, but no direction shall be given under section nineteen of this Act by virtue of this section in relation to such a building.
If a local authority make an order under section twelve of this Act as applied by the foregoing subsection as respects a building at a time when another order under that section is in force as respects one of the dwellings in the building they shall revoke the last-mentioned order.
References to a house in sections seventeen, eighteen and twenty-three of this Act shall include references to a building to which this section applies.