The Millennium Tower in San Francisco demonstrates how engineering predictions can fail catastrophically when geotechnical conditions are not properly assessed; the 58-story building was designed to settle only 6 inches over its lifetime but actually settled 18 inches, tilting 28 inches off plumb, with a marble placed on its floor rolling toward the northwest wall due to the structural deformation.
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$100M Fix Failed Millennium Tower!Added:
Place a marble on the floor of any apartment [music] inside 301 Mission Street in downtown San Francisco. Set it down on any flat surface, then let go.
The marble will roll on its own toward the northwest wall. It has been doing this since before most residents knew there was a problem. In 2026, it is still rolling. 6 in That was the number stamped on every engineering report. The total amount Millennium Tower was predicted to settle over its entire lifetime. The building has sunk 18 in.
The top corner leans 28 in off plumb.
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