webuser_469310429's ideas
Like the divider wall - rather than breaking up the space with full walls and being contained....rather like to see either a small wall in the middle dividing the space on the main floor - with either fireplace inset, showing on both sides... of fireplace on one side and bookcase of something on the other side.
Like the platform to break up the space....I think I mentioned that in another picture too. Maybe a reading corner nook that you walk up 2 or 3 steps...from the family room (rather than a formal living room space)
Q