Paragraph 9

When a clearance order has become operative, the owner of any building to which the order applies shall take down and remove that building before the expiration of 6 weeks from the date on which the building is required by the order to be vacated, or, if it is not vacated until after that date, before the expiration of 6 weeks from the date on which it is vacated, or in either case, before the expiration of such longer period as in the circumstances the Executive may deem reasonable; and, if the building is not taken down and removed before the expiration of that period, the Executive shall enter and take down and remove the building and sell the materials thereof.