IT'S A RICO CASE:

He was a personal-injury lawyer who often worked out of taxi offices scattered around New York City.

There was the one above the run-down auto repair garage on West 16th Street in Manhattan, on the edge of the Meatpacking District before it turned trendy. There was the single-story building with the garish yellow awning in the shadow of the Queensboro Bridge. There was the tan brick place on a scruffy Manhattan side street often choked with double-parked taxis.

And then there was his office on the 26th floor of Trump Tower overlooking Fifth Avenue, right next to the one belonging to Donald J. Trump. [...]

He has spent much of his personal and professional life with immigrants from Russia and Ukraine. His father-in-law, who helped establish him in the taxi business, was born in Ukraine, as was one of Mr. Cohen's partners in that industry. Another partner was Russian. And Mr. Cohen used his connections in the region when scouting business opportunities for Mr. Trump in former Soviet republics.

More recently, Mr. Cohen and his father-in-law lent more than $25 million to a Ukrainian businessman who has a checkered financial record and a history of defaulting on loans. And Mr. Cohen long held a small stake in his uncle's catering hall, which was frequented by Russian and Italian mobsters.

In addition to his legal and taxi businesses, Mr. Cohen has had a seemingly charmed touch as a real estate investor. On one day in 2014, he sold four buildings in Manhattan for $32 million, entirely in cash. That was nearly three times what he paid for them no more than three years earlier.

"This is the type of person you'd see most bankers steer clear of," said Ben Berzin, a retired executive vice president and senior credit officer at PNC Bank who clashed with Mr. Trump in the early 1990s over loans to the future president's troubled Atlantic City casinos. The speed with which Mr. Cohen successfully flipped real estate stands out, Mr. Berzin said. "You have to ask what's going on."

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