Welcome to Kitchens! Do you need the peninsula? Is there a reason for it? Have you considered an "L" with the range on the "top" wall and the sink on the right wall (using the drawing w/dimensions to determine left/right, top/bottom)? Here are some ideas. I tired to keep the plumbing as close as possible to the original location. Oh, in all except Layout #3, the counter run along the right wall is 27" deep with 15" deep uppers. This gives you a bit more workspace on the counter and quite a bit more storage in the upper cabinets. You'd be surprised how much of a difference those 3" make in upper cabinets! The cabinet above the sink is farther off the surface and could be a dish rack for both utilitarian as well as aesthetic value. .. .. .. This one is probably my favorite... Plenty of prep space, plenty of room around the range, decent pantry space, and more open. I'm of two minds concerning the MW. It could be put in the corner as I show it, but it could also be a MW drawer in the 24" cabinet to the left of the range. In the corner, it gives you the full height of the 24" cabinet for storage. In the drawer, it opens up the counter completely and is more open. (That cabinet to the left of the range must be drawers. If it has doors, you'll need around an 1" of filler b/w the wall and cabinet so the cabinet might have to be narrower...assuming full-overlay or frameless cabinets.) Here it is with the primary zones marked (I put a MW drawer in this one so you could see it): Why a double-bowl, 36" wide sink? Because (1) it allows you to use one bowl for prepping and one for dirty dishes and (2) the larger bowl can be 21" wide...approx the same width you would get using a single-bowl, 24" wide sink base. Here is a link that might be useful: Read Me If You're New To GW Kitchens!

This is possibly (probably) more than you want to do, but it gives you two baths (one shared, one master) with a smaller addition, which might save enough on materials to change some of the interior walls. You'd have a bigger sitting area just inside the front door, with some flex space between it and the kitchen. The TV is drawn on an adjustable arm, mounted beside the front door, but could be on a small stand in the same location. The extra kitchen chair is beside the wall of book cases. I used your template for a couch, but there is space for a longer couch to convert to an extra bed. The kitchen table can be moved out from the wall when needed, and pushed out of the way when there is activity in the kitchen. The red lines denote the master bedroom and bath, and the green lines on the original plan, at bottom left, indicate interior walls which would not change (other than relocating a closet door from front to back). I changed the orientation of the tub and toilet in the second bathroom, to block the view of the toilet, but that wouldn't be necessary, and would be another saving in costs. The vanity in the master could become a single, with the toilet on the same wall. It's a small bath, with adjoining small closet, sufficient for AirBnB or student rental, but the bath could be enlarged, with a number of layouts, and one of the bedroom's exterior walls could be closet space (inset, bottom right). Moving the wall back into the first bedroom, and adding book cases or a combination of open and closed storage cabinets on the exterior wall, opens that long hall way into an extension of living space, and puts the entrance more in the middle of the room. No windows or exterior doors change. The area at the bottom of the smaller master bedroom could become a private porch or deck for the master. (Waving to any Smaller Homes peeps from the old days. :)

think & kudz: I was attempting to give the owners the maximum view and balcony access by making the middle bedroom the master, leaving the larger master (which is quite far from the bath) to contain guest, office and media room furnishings with no balcony and possibly a less exciting view. Not sure which view sees the ESB, but assume it is the balcony area since the OP is focused on that. With the bed placed on the "west" wall of the room, the view may be enjoyed from there and chairs can be added near the opening and/or on the balcony in good weather. Perhaps the smaller closet in the room could be converted to a coffee/wine bar, turning the space into a self-contained a.m.or p.m. retreat. A door on the "north" end of the "east wall" could give easy access to the office. The main issue for me is the distance anyone has to go to reach a bathroom. If the foyer closet and LC could be moved forward that bath would at least feel more spacious and the shower enclosure could be larger. I also wonder if that front foyer WIC would be better if incorporated into a larger, more luxe master bath.

If the view is at the back of the house, consider relocating bedroom2 to the front of the house and construct a large opening to the addition. The kitchen would incorporate one eating area and be surrounded by windows to the view. The laundry room with stackable w/d is in the center of the house. It would be nice to have an open staircase allowing a good entrance foyer and taking advantage of seeing right through to the view at the back of the house. You mentioned that your husband and bother in law both are in the construction business, so they will be able to determine proper structural beams when enlarging the access opening to the addition.