New York City has long been the center of U.S. -- and some would argue global  -- financial activity. Vast fortunes have been earned and lost many times over in America’s most populous city. The relative newcomers in the financial landscape of New York City are the single-family offices. As the number of billionaires worldwide has increased, so have the quantity and sophistication of investment offices dedicated to managing those fortunes. As the financial capital, Trusted Insight is highlighting New York City-based single-family offices: