New Orleans Hard Rock Cafe collapse yesterday - GIF
Rumored cause for the collapse
Some third-hand sources (not too far from the site) remarked that the collapse was initiated from a loaded dumpster being lowered from the upper floors that slipped from its harness (or the harness failed?) then fell onto the structure which then became the domino resulting in total structural failure.
Bear in mind that I have not gotten any independent validation for this being the likely (or even a remote) cause, but that could go a long way to explaining why such a new construction could fail in this way.
If someone gets to official word, I'd hope you share it.