I was in the one in Seattle around 2000 on the 5th floor of a building, and I distinctly remember walking down the hall with the building swaying like a boat in a storm, wondering when the whole thing was just going to snap and crumble into a pile of rubble. Luckily it turns out they make modern buildings not do that. I've been back to that building and they still have cracks in the stairwell from it, though.