The Baltimore Convention Center is a convention and exhibition hall located in downtown Baltimore, Maryland. The center is a municipal building owned and operated by the City of Baltimore. The facility was constructed in two separate phases: the original Center, with 425,000 square feet (39,500 m2) of exhibition and meeting space, opened in August 1979 at a cost of $51.4 million. A $151 million expansion, which increased the center's total size to 1,225,000 square feet (113,800 m2) was completed in April 1997. The 752-room, city-owned Hilton Baltimore hotel opened in August 2008, connected to the convention center by an enclosed skywalk bridge.