Hackensack University Medical Center lies on a multi-building campus which includes the nine-story Hackensack University Medical Plaza building, which was constructed in 1998, and opened on September 21, 1998, is one of the largest adult ambulatory care facilities in the northeastern United States and one of the largest in the country. The address of the Hackensack University Medical Plaza is 20 Prospect Avenue, which is located at Hackensack, New Jersey at Hackensack University Medical Center. Though Hackensack UMC has one for almost every one of its buildings, the Hackensack University Medical Plaza building has HUMC's largest above and below grade parking, with a capacity of approximately 1,700 cars, and even offers valet parking and door-to-door service. Factually, there's a special connector on the third floor that connects from the parking garage to the elevator hall in the Medical Plaza. As of January 2007, there are 15 buildings on the HackensackUMC campus, besides the Hackensack University Medical Plaza, the main buildings include: