Surveillance video captures the collapse of a 13-story condo tower outside Miami last week, showing how the southern side of the structure crumbles. Watch our annotated video. https://nyti.ms/3jpKKNc | The New York Times

Catastrophic collapse of a building after the completion of concrete pouring for the second flat roof. The failure originates at the first roof, a permanent structural element that could not bear the additional load imposed by the temporary works and the new concrete above. Likely causes include the first roof not reaching its full design strength or an underestimation of the combined loads in the design process. The incident highlights the critical importance of properly managing the interactio