Whenever any House is rebuilt within the Limits of the special Act, the Level of the Cellar or other lowest Floor of such House shall be raised sufficiently to allow of the Construction of such a Drain as is herein-before provided in the Case of Houses to be built after the passing of the special Act; and whenever any House is taken down as low as the Floor of the First Story for the Purpose of being built up again, such Building shall be deemed a Rebuilding within the Meaning of this Act.