Here is some I witness testimony from the article. The building was doing bad things before the pool desk collapsed.
“Sara Nir, another resident, told The Washington Post that she saw something similar. She first she heard a number of knocking sounds that grew more intense and eventually sounded like a wall falling down.
She then heard a large crash so went to the lobby with her two kids to ask a security guard what was going on.
She says that while in the lobby, she watched the pool deck implode on itself, falling onto the underground parking garage. The building started to fall and she and her kids ran for their lives. They all survived.
God pic and diagram of parking garage from Freeper rxsid. Inspector said the water was pooling in parking spot #78. Notice the cars have fell 4 feet, they should be sitting above the brown part of columns.
https://freerepublic.com/focus/news/3971615/posts?page=75#75