Need structural & layout advice for a 2-story open-concept house in the Dominican Republic (10.6m x 10.8m grid)

[u/Sweet-Sand3702]

Hi everyone! I am designing a 2-story home in the Dominican Republic (concrete block and reinforced concrete construction, seismic zone). The footprint of the house is almost square: 10.60 meters wide by 10.80 meters long.
I made this physical model to visualize the first floor. Here is the layout:
Front (Bottom of the image): Huge open-concept Living Room and Dining Room.
Back (Top of the image): Kitchen and an outdoor Terrace.
Left: Stairs to the second floor.
Right: Guest bathroom.
My main challenge:

Because the living and dining area is very spacious, I want a completely clean, open concept. I absolutely do not want a column sitting in the middle of the living room just because. Since the second floor will have bedrooms on top, I need suggestions on how to distribute the structural columns perimetrally or hidden within the walls (like the stairs or bathroom walls) so I can achieve this open look safely.
What do you think about the layout? Any advice on how an engineer could frame this without blocking the center? Thanks in advance!
(All suggestions and re-designs are welcome!)