[JD_UTDallas]

250 feet to bedrock they went cheap on the initial foundation with friction piles into clay obviously not enough of them.

https://www.builderonline.com/land/local-markets/s-f-s-millennium-tower-to-lean-no-more_o

[Steve Van Doorn]

said, "friction piles into clay obviously not enough of them"
Think of a pin cushion. You put in a lot of small pins into the cushion the cushion itself will push down when you put something on top of the pins. It's not that they didn't have enough. They where not through the pin cushion into the rock below.

It's down by an inch in the center. That building my not make it before the fix.