A 2018 report raised major red flags about the structural integrity of the Champlain Towers South, the Surfside condo building that partially collapsed this week, killing at least four and trapping another 159. The engineer tasked to survey the building for its 40-year recertification found “abundant concrete cracking and spalling” as well as failed waterproofing below the pool deck that was causing “major structural damage” to the slab below the deck, entrance drive and planters,