A couple of years ago a condo tower building somewhere near Miami collapsed...killing 100 and causing a billion dollars of damage. With the heat,humidity and proximity to the ocean one would expect concrete to deteriorate over time. And the soft ground beneath these big buildings would be expected to subside over time.
Link worked for me on a computer. May not work on a phone.
A couple of years ago a condo tower building somewhere near Miami collapsed
“the deadly 2021 collapse of the Champlain Towers condo in Surfside” is discussed in the article if you had read it.
Why anyone would still build on the beach is beyond me. Unless, they don’t expect to be alive in 20 years to face the consequenses.
But, not discussed the article is the idea of digging a hole down the 200 feet to the bedrock. I assume it sould be astronomical to do so.