stress point markings

[ammonium nitrate]

hi, i am aware that builders usually build a small mark into a building at it's stress points so that if demolition is required, engineers know where to place the explosives and do not need to spend an excessive amount of time in a structurally unsound building to find the places to put the gelagnite, however when a building is deemed structurally unsound ofter it has shifted in something such as n earthquake, wouldn't that move the stree points making the engineers markings redundant?