In 1836, mayor Cornelius Lawrence opened 42nd Street to encourage the city's northern expansion, saying "move up town and enjoy the pure, clean air". The Theater District began attracting theaters and restaurants after the Metropolitan Opera House moved to West 39th Street and Broadway in 1883. Oscar Hammerstein I opened his Victoria Theatre on 42nd Street in 1899. Accessibility to the Theater District improved as electrified trolley lines started in 1899, followed by the opening of the New York City Subway's first line in 1904.