The historic Pacific Electric Building, opened in 1905 in the core of Los Angeles as the main train station for the Pacific Electric Railway, as well as the company's headquarters; Main Street Station served passengers boarding trains for the south and east of Southern California. The building was designed by architect Thornton Fitzhugh. Though not the tallest in Los Angeles, its ten floors enclosed the greatest number of square feet in any building west of Chicago for many decades. Above the train station, covering the lower floors, were five floors of offices; and in the top three was the Jonathan Club, one of the city's leading businessmen's clubs introduced by magnates from the Northeast. After the “Great Merger” of Pacific Electric into Southern Pacific Railroad in 1911, the PE Building became the home of Southern Pacific in Los Angeles. In 1925, a second electric rail hub, the Subway Terminal, was opened near Pershing Square to serve the north and west.