How do you lose more than $900 million?
"I think a good part of it was mistakes," said Barbara Res, a former executive vice president at the Trump Organization who managed construction at Trump Tower.
Res said the mistakes started in the 1980s, when Trump paid $365 million for the Eastern Air Lines Shuttle and $400 million for the Plaza Hotel.
"He overpaid for all that stuff," said Res. "Those were not wise decisions. Those were mistakes on his part."