expensive materials, the possibility of fire is always there because material is just "one". Workmanship is another. MAny things are considered in construction including economics so use of "cheap" materials is one good option.

As I said above, the fire safety of any building is a system which in the case of the Villagio fire last year was "somewhat" overlook.

During design stages, the individual rentable spaces in a commercial mall as big as Villagio is taken theoretically.