I heard it said the building was 40 years old, what might be is a accumulate effect for such a failure. When contracts for a pour of concrete are done there are strength numbers associated with the pour that include reinforcement steel. Those areas are the first place people try to steal moneys from a big project. Other failure considerations might include footings and how much has to be driven into the land to support the height and weight. One thing is for sure, they will figure out what happened.
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