It was actually 4 casinos.
https://news.temple.edu/news/2016-10-25/bankruptcy-expert-studies-trump-casinos
Those Las Vegas casinos you are referring to are in compliance with money laundering laws. Trump's were not.
If you're not taking in enough to cover the amount of money laundering you're doing, you'll end up with a loss on the books.
I'm sorry, I thought it was pretty obvious that I was making a comparison that was contemporary with FinCens actions against the Trump crime syndicate. Not 70+ years ago.