“The deck — which sat on skinny columns to maximize parking space below — was barely designed with enough strength to support a pool party, much less the layers of pavers and standing water that loaded it down over the decades,” the report says. “While original design flaws alone were unlikely to have initiated the collapse that happened 40 years after construction, engineers consulted by the Herald said the deficiencies, in combination with concrete deterioration, could have been the difference between a single floor caving in and the kind of progressive collapse that killed 98 people.”