First question is building code violations and construction of the building.
It reminds me of China where cheapness and cutting corners cause buildings to collapse.
It’s a form of corruption.
While one can probably hire an expert to say anything, it's going to be difficult to establish construction defects in a 40 year old building. Missing steel in the concrete might do it but the way the slabs held together makes that look less likely.
I suspect a combination of subtle faults. Rebar that may have just barely met code in concrete that was more porous that expected (but still met code). Insufficient accounting for salt spray resulting in accelerated corrosion of rebar leading to spalling of concrete, slightly but significantly greater on the windward side. Combine those two issues with deferred and improper maintenance and you have a building that may only barely last it's entire design life.
The building stood for 45 years it will be hard to blame it on building codes!! Building codes in the early 80’s were far different than they are now!!
I remember Donald Trump saying, in one of his 2015 or '16 campaign speeches, that corruption is a form of taxation.
God, I miss him.