Such unplanned collapses are rare in the modern history of structural design, experts say. Structural engineers aim to design buildings that can withstand the loads from forces and hazards such as gravity and weather. How are structural engineers reacting to the collapse of Champlain Towers South? As the U.S. building stock continues to age, might we see a rise in the number and severity of events like the Surfside building collapse? How are investigations into a large building collapse such as this one conducted?