Where the erection of any building has been commenced, or is being carried out, or has been completed, in contravention of any restriction or condition imposed under section 14 or of a plan for the redevelopment of any slum clearance area or in contravention of any notice, order or direction issued under this Act, the prescribed authority may, in addition to any other remedy that may be resorted to under this Act, or under any law, make an order directing that such building shall be demolished by the owner thereof, within such time not exceeding sixty days, as may be specified in the order, and on the failure of the owner to comply with the order within the time specified, the prescribed authority, may itself cause the building to be demolished and subject to the provisions of section 61, sell the materials thereof :
Provided that, before making any order under this section, the prescribed authority shall call upon the owner to show cause why the order should not be made and after considering the cause, if any, shown by such owner, it may pass such orders as it deems fit.