North of Chelsea and west of the busy streets of Midtown sits the largest planned development project in U.S. history, Hudson Yards. Hudson Yards’ 16 skyscrapers and millions of square feet of new office, residential, and retail space lie by 26 to 28 acres of Hudson River waterfront. These high-rises are built on platforms over currently functioning railways, making it an engineering and technological feat unseen in the modern era. More than ten years in the making, this master-planned, mixed-use community is seen as a mini-city in and of itself.