New York City Mayor Zohran Mamdani’s attempt to revive an old plan to build 12,000 affordable units over a borough railyard is seen as a long shot, even if he gains support from President Trump. Mamdani has garnered headline attention for proposing to build units on a platform above Sunnyside Yard, a 180-acre freight and marshaling area in Queens. The ambitious idea has been stuck in neutral for more...