 In 1912 the Spreckels Theater opened downtown, the first modern commercial playhouse west of the Mississippi.A new commercial pier, the Broadway Pier, was built by the city in 1913.In the 1910s, Downtown became one of the many San Diego neighborhoods connected by the Class 1 streetcars and an extensive San Diego public transit system that was spurred by the Panama-California Exposition of 1915 and built by John D. Spreckels.