Hudson Yards is a real estate development in the Chelsea and Hudson Yards neighborhoods of Manhattan, New York City. It is the largest private real estate development in the United States by area. Upon completion, 13 of the 16 planned structures on the West Side of Midtown South would sit on a platform built over the West Side Yard, a storage yard for Long Island Rail Road trains. The first of its two phases, opened in 2019, comprises a public green space and eight structures that contain residences, a hotel, office buildings, a mall, and a cultural facility. The second phase, on which construction has not started yet, will include residential space, an office building, and a school.