Section 9(3) in Tamil Nadu Slum Areas (Improvement and Clearance) Act, 1971
(3)If no such undertaking as is mentioned in sub -section (2) is given, or if, in a case where any such undertaking has been given, any work of improvement to which the undertaking relates is not carried out within the specified period or the building is at any time used in contravention of the terms of the undertaking, the prescribed authority shall forthwith make an order of demolition of the building, or require that the building shall be demolished within such period as may be prescribed.
