After the staircase to the basement was built, we began to replace all the compromised floor joists in the dining room and hallway.  There were a total of ten beams that needed replacement.  One at a time we squeezed them in and attached them to the quadruple 2 X 10 beam with joist hangers.

Once all the joists are in, a new 3/4" plywood sub-floor will go down and then new hardwood.