It's actually quite a bit more intricate than that.
The buildings are built both inside and out, down to the furniture in the offices. The suit actor must hit a mark on them PRECISELY, or they will not fall or worse, fall at the wrong time, which then means that they must be rebuilt from scratch at great cost.
As for the suit, it is 200 pounds of latex, metal, and remote-control electronics. The actor can only wear it for about ten minutes at a time, due to its weight and lack of air, and he is nearly blind within it. He cannot remove it by himself, and is essentially helpless in emergencies. Several actors have been injured in the suit.
Sounds like computer graphics have been a relief to some people.