[saltedonion]

It’s probably more likely that salt air corroded the steel rebars. This is a known issue.

[tomarr]

Is it? Spalling is usually noticed a lot more, you would probably see some yielding or signs of progressive collapse first.

The pictures I have seen make foundational failure look more likely.

[saltedonion]

https://www.wsj.com/articles/what-we-know-about-the-miami-ar...

Talks about it in this article