I did that.  Read the entire Wikipedia summary.  His daughter's Trust  bought a building from Trump nine years ago.

"In 2008, Ekaterina Rybolovlev's trust bought the 18 bedroom Maison de L'Amitié in Palm Beach, Florida, from the American businessman Donald Trump."

Supposedly, Trump made $60 million on the sale.  Bought at $40 million; sold at $100 million.

This is your "smoking gun"?