Section 64(1)(b) in New Town, Kolkata Development Authority Act, 2007
(b)to re-erect- .(i)any building of which more than one-half of the cubical contents above the level of plinth have been pulled down, burnt or destroyed, or(ii)any building of which more than half of the superficial-area of the external wall above the level of plinth has been pulled down, or(iii)any frame-building of which more than half of the number of columns or beams in the external walls hive Been pulled down;