Hello! I have a row home with side-to-side floor joists that, where there is a stairwell, are tied to another joists running front-to-back. (B on diagram, which transfers its load to A and C). There is a wall under these joists which creates a hallway on the 1st floor. As far as I can tell the floor system is carried both by the front-to-back joist tied to A and C, AND by the wall. I want to remove this wall, any ideas on how to do this? Thanks!