what could be the quantity of steel and cement that could go in for a commercial building per sq.m?

Answer 1

it really depends on the geometry (height, depth, length) and type(what will it hold, person capacity, heavy or light items) of building its going to be. It also depends on the type of soils and place you are going to build it on.

Answer 2

That depends greatly upon the specifics of the building, including the # of floors, the structure of the building, the geological conditions of the site where the building is going to be, the square footage of space for the floor, etc...

Sorry, need more specifics for any sort of an answer.