Despite forays into airlines, casinos and steaks, Donald Trump’s fortune remains largely tied up in the industry that made his family rich: real estate. A new Forbes investigation into Trump’s wealth pegs his net worth at $3.7 billion, down $800 million from a year ago. Much of that drop — some $475 million — comes from a decline in the estimated value of his properties. The presidential hopeful lost the most in New York City, home to roughly 53% of his fortune. Cooling markets for retail and office space in Manhattan helped lop about $300 million off the net value of some of his most notable buildings, including ... (full story)