4 world trade center (also known by its street address, 150 greenwich street) is a skyscraper that is part of the world trade center complex in new york city. it is located on the southeast corner of the world trade center site, where the original nine-story 4 world trade center stood. pritzker prize-winning architect fumihiko maki was awarded the contract to design the building. it houses the headquarters of the port authority of new york and new jersey (panynj).