FORT LAUDERDALE, Fla.—Alfredo Lopez and his wife Marian were asleep when the first thundering blast jolted them awake. Moments later, a second boom, much louder than the first, shook their bed on the sixth floor of their Miami apartment. Alfredo rushed to wake his 24-year-old son Michael, urging him to get dressed, before running to the balcony window. “All I could see was just white dust, very thick. I could barely see the balcony railing.” The lights cut out and the emergency alarm came on, warning the residents of Champlain Towers South to evacuate. The Lopez family—Alfredo is 61, his wife Marian, 67—lives on the street side of the condo that’s still partially intact, but when he opened the front door half of the building was gone. A jagged five-foot chunk of flooring barely left enough room to escape. “There was no hallway, no ceiling, no apartments, no walls, nothing.” …