I would flip flop the living and dining areas. In the dining area, I would do banquet seating which will help to get you a little more room. The tv would have to go in front of the big window which normally I wouldn’t suggest but I think it’s the best solution for your space.

We are in a rental home, which means no wall mounts for us! thats part of the predicament, i think. I feel like the sectional also closes off so much of the available wall space that I can't create a "nook" for my office area. The room is roughly 16ft by 17ft with vaulted ceilings. The built-in was originally a wet bar, and was turned in to an open storage area. The "bar" itself sits pretty high (too high to consider making that area of "office" style use!) So we figured that's where our TV would have to go. Thank you so much for your interest in helping me!!

I like the fireplace as is, and a warm white on the walls would enhance fireplace and all of the wood.. I would go warmer than this. Benjamin Moore’s Ballet White or Swiss Coffee could be possibilities. I like BM’s Natura Line. As far as furniture placement, I think 2 seating areas. One option, instead of sofa, etc. could be a center cocktail table or ottoman with four chairs. Or if you would rather have a sofa arrangement. I would put a small scaled sofa on the wall facing windows. Small scaled sofa would go where black marker is in this view. w/ rug: https://www.roomvo.com/share/o0am4r And sofa could possibly be larger; it is difficult to estimate available space there. so I am saying small scaled to be on the safe side. And if there is to be a tv in the space, I would place it on long, low console in front of windows. Additional seating by fireplace, but I have not yet figured out what would be best there. A chair or two, I think. Perhaps a chaise.

Dont worry about the divided floor, as long as you divide your functional groupings in the same way. That is, ok to use the smaller zone as your TV room, but only if all the furniture for that fits on that side of the walkway. Otherwise, put the TV on the wall to the right of the fireplace, and set up your seating arrangement in an L to encompass both (and maybe an extra chair or two for visitors). Then the "den" makes a natural office, etc., and you have plenty of seating in the larger space for hanging out or conversation.