You mean "One Campus Martius".
I'm not sure how much load it supports. However, I can tell you that the existing building has two elevator banks, each containing 8 elevators and 2 empty shafts. The story I heard was that the four empty shafts were there in case the building was ever expanded. The expansion could utilizing the existing elevator shafts.
The murals are painted on the backside of the elevator shafts.
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