(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 one half of the superficial area of he external walls above the level of plinth, has been pulled down; or(iii)Any frame-building of which more than half of the number of posts or beams in the external walls have been pulled down;