That would make the smallest piont around 2 meters ? Your levels seem to be 3 meters high, so stairs would need at least 4 meters in length to get to the next level, than you need elevators. You core would be somthing about 6 to 4 meters. Not much space to use on the upper levels i think.
Dont misunderstood i like the design, but i think you should widen it up a bit. especially if i see it right and your core is about 1/3 of each upper level
Second thing is widen up the sidewalks for at least another meter, so two people could walk aside without fearing of the nearby trafic
Just some suggestions