Section 211(2) in The Bombay Provincial Municipal Corporations Act, 1949
(2)When any building or any part thereof within the regular line of the street falls down or is burnt down or is taken down, whether under the provisions of this Act or otherwise, the Commissioner may at once take possession on behalf of the Corporation of the portion of land within the regular line of the street theretofore occupied by the said building, and, if necessary, clear the same.