The interior columns have over 500,000 pounds of dead load in them. Assuming a conservative safety factor of 1.2, while it wouldn't meet code, the columns should be able to support an additional 100,000 lbs of load before failure. I don't feel that an RTU would cause a collapse of this...
General Structural Note #3 on S11 spec's precast piles to 100 kips. FYI the North Building is included in the PDF, and there are differences between the two.