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Post tensioned cables weren’t in widespread use in buildings like this one when this one was built. In any event, they wouldn’t have been in the columns and those were what failed. It’s obvious that there was some rusting of the rebar in the balcony slabs and the report indicated the previous repairs were done improperly.
I don’t think any of that matters. What looks most likely to me is that the foundation failed catastrophically. If that description by the woman in the building to her husband is correct and the slab adjacent to the pool collapsed before the building fell, then I think it is most likely that the failure was begun in whatever this building was built on. I have no idea if there are piers extending into limestone, or what the foundation might be.
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