It’s able to have the small footprint because of a water tank on the top floor that sloshes around to counter the swaying forces caused by wind.

Kind of a long video, but watch the first 7:30 or so for the background and explanation. Or just go to straight to 6:10 for the explanation of the water tank.

https://www.youtube.com/watch?si=0K1g6GVNxnH-TPka&v=kNph_SxgcPg&feature=youtu.be