What considerations are there when blowing up/demolishing a building?

Question: What considerations are there when blowing up/demolishing a building?
- Keywords:
  building,
  explode,
  explosion
Asked by mrinsanet to Sean, Asif on 16 Mar 2012.
- Sean Murphy answered on 16 Mar 2012:
  
  The first one is whether there is anybody still in it! Other than that you would need to look at the economics of demolishing/rebuilding v maintenance, and also consider what will be in place of the building.

Question: What considerations are there when blowing up/demolishing a building?