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>> reporter: also buried underneath the rubble, clues as to what may have caused the collapse. what investigators may focus on is whether the structural supports beneath the complex gave way. an engineer's report from an engineer's report from 2018 showed the champlain tower south condo building had abundant cracking in columns beams and walls in the parking garage and major structural damage to a concrete slab caused by failed waterproofing that if not repaired in a timely fashion would cause the concrete to deteriorate, but did not indicate if any of these issues could lead to a collapse. john pistorino is a veteran engineer and expert in building design. >> we always look for some evidence of settlement where something is going on in the foundation, it starts to make the building settle or maybe a column or something settle. >> reporter: cbs news has learned a month after that survey was presented, a city building official told the condo board that the building was in pretty good shape. he has since denied seeing the