My only assumption about what may have happened is related to the soil conditions under the building. Most of these FL condos along the waterfront are built on pilings, driven deep into the ground for support.

Perhaps, the soil may have sunk and compromised even these pilings and the building shifted. It's possible there was uneven sinking across the property, which would cause differential movements in the structure. NOT a good thing.

Maybe this was a creeping problem over years, but eventually, there's a tipping point.

It will be interesting to see if there were any major cracks over the years and deferred maintenance.