I am renovating a condo, that has a concrete suspended slab for ceiling and floors as well as concrete?masonry for all exterior walls. As such none of the interior walls are supporting. The plan is to remove/ modify some of the walls to open the floor plan up. I hate the way these walls have been constructed and think with our designs wood framing will be much better and more solid. I also am used to only using wood. My question is this; is there any building code regulations requiring me to stick with steel, for fire reasons or can I make the switch?