 The station, and its accompanying 34-story high-rise building, opened on November 14, 1991, making the station the second infill station in the San Diego Trolley system.America Plaza originally was where the Orange and Blue lines split.The Orange Line used to loop south and east on its way to Gaslamp Quarter and back to 12th & Imperial Transit Center, while the Blue Line used to turn north towards Santa Fe Depot on its way to Old Town Transit Center.