Section 219(2)(a) in The Gujarat Municipalities Act, 1963
(a)power when any building or block already existing or in course of erection, by reason of any defect specified in sub-section (1) has given or is in the opinion of the municipality likely to give rise to such risk as aforesaid, to require by a written notice, to be fixed upon some conspicuous part of such building or block and addressed, as the municipality deems fit, either to the owners thereof or to the owners of the land on which such building or block is erected or is in course of erection that the persons so addressed shall, within such reasonable time as shall be specified in the notice, either pull down or remove such building or block, or execute such works or take such action in connection therewith as the municipality deems necessary to prevent all such risk or disease;