There were two 4 X 8 floor joists in the basement that originally supported walls above them. One was under the staircase that led from the first floor to the second,  and the other supported the second interior dining room wall(the one without the double glass doors)

  Me and Rob jacked those walls up using the adjustable lally's and then snuck in some new double glued & screwed pressure treated 2 x 8's to hold up the walls.  Rob built a 2 X 6 wall under the new beam beneath the staircase as there was a great deal of weight above it. Seems the first floor staircase supports the other staircase & wall leading up to the 3rd floor.

Next post I'll show the new staircase to the basement.