Trump businesses have been losing money. Again, the NYTimes said he lost like $50 million in 2018, lied, and claimed he earned $400 million. Oh, and that's not considering the hit from COVID-19 since this is about his tax returns and 2020 hasn't been taxed yet. It seems unlikely Trump can solve his debt problem by selling stuff off. He'd need a buyer, and I don't think he'll get them. Well, not soon, in any event. Remember 666 5th Ave? That was a chore, and the outbreak hadn't happened yet. Trump has to do that a dozen or more times, without the benefit of a partner eager to sell.
Of course, there's another option.
Bankruptcy.
Again.
It's likely Trump put these loans into some kind of LLC or whatever, meaning in each case he'll "only" lose the property but not his own money. Personally, I want to see a bank scrape Trump's name off what used to be his tower. Maybe Trump can see it through his window at Riker's.
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Trump does not have any kind of immunity to debts just because he lives in the White House.