It goes without saying that it has been ages since humans decided to build buildings from different materials and day by day these materials were improved. Although old and traditional buildings still have good strength and can be used for different purposes, some people believe that old buildings must be removed and construct new buildings instead. In addition, some people believe these buildings can be renovated and as far as I am concerned, old public buildings must not be demolished and in what follows, two elaborate reasons will vindicate my standpoint.