Nowadays, what we think of collectively as “Wall Street” no longer exists on Wall Street. The only major Wall Street firm physically on Wall Street is not even American; it’s German. In 2001, the U.S. securities arm of Deutsche Bank, the giant German bank, bought the elegant building, at 60 Wall Street, that was the headquarters of J.P. Morgan & Co., in the years before its merger with Chase Manhattan Bank. Meanwhile, the original headquarters of J.P. Morgan & Co., at 23 Wall Street, has been a vacant shell more or less since the bank sold it, in 2003, after the Chase merger to a real-estate developer, who then sold it five years later to an elusive Chinese billionaire, Sam Pa, for $150 million. Pa has done nothing with the building.