In my model , I used steel frame system because it easily available and it can hold a large span also as compared to wooden frame structure so it requires less material and reduce the cost .While placing the structural columns on the grid I tried to align with the exterior walls so that it will not visible from the exterior façade of the building. I have placed some of the columns around my atrium on level -2 which can be used as aesthetic feature as well as provide support also and on level 1 it is kind of open space .Steel frame system has an advantage also we can hide the column with the interior walls easily If it is near the interior wall. The Structural framing beam system I used in my model are W14x30 and W12x26. The main challenge I am facing in my model is how to place a plinth beam and how the structure will form on that plinth level , still working on that.