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Down? the clue it offers is that the engineer should have been given access to check the interior of the building, the slab, which he never had access, for some reason. it showed that deterioration was going on. but he did not check the main towers and check the slab/column connections. this building is a flat slab construction. so punch and shear, where the column punches through the slab, that s a common failure for these types of structures. if he had been given access to check those column connections to the slab, we would have known whether those were badly deteriorated and whether punch and shear was going to be an