Section 342(4) in Gauhati Municipal Corporation Act, 1971
(4)At any time after a building or part of a building has been vacated under sub-section (2), if the Commissioner considers that it can be rendered fit for human habitation by structural alterations and repairs, he may by notice in writing call upon the owner to execute, within a period of six months from the date of receipt of such notice, such structural alterations or repairs, as he deems necessary and if at the expiration of the aforesaid period such alterations or repairs have not been executed to his satisfaction, he shall issue to the said owner a notice in writing ordering the demolition of such building or part thereof within a period of thirty days from the date of the receipt of such notice or such longer period as the Commissioner may specify.