Where would you put the Square Footage/Space Design in your New property build?

If you were moving into a 1200 sqft duplex... where would you want the largest spaces to be? What modern big Stuff should be accommodated for-like those monster furniture combined California King beds. Each bedroom has attached bath and 6 foot deep walk-in closet? Best practical or living ease that would make you super comfortable there?
Where would you put the Square Footage/Space Design in your New property build?
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