Hello My Suggestions --Make a solution with high ductility,(Rx=Ry=8) --The narrow side of the columns should not be less than 30 cm, --Model the ladder and solve it together, --You can reduce the roof slab loads, remove the wall loads, --Rate slab additional reinforcement increase it, -- S11 column should be in the down direction, not up, -- If you are going to make an elevator pit on the raft, check the link. HOW TO MAKE ELEVATOR SPACE