Not American made. It was jewish built so done completely on the cheap. Rain water was soaking into the structure plus the pool deck. The rebar was rusted out all over.
The weight was also higher than designed as condo owners installed granite counters and tile floors and tiled the balconies.
I also know that it wasn't a sink hole. The pool deck collapsed down into the underground parking structure. The video made by the tourist from the next building showed the rubble from the collapsed pool deck.
Again, all of those problems with weight, crap building materials and design, water permeating the structure to rust out the rebar led to the failure. A guy named Jeff Ostroff posted a series of youtube vids on this.
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