California Street in the Financial District The legacy of the California Gold Rush turned San Francisco into the principal banking and finance center of the West Coast in the early twentieth century.[138] Montgomery Street in the Financial District became known as the "Wall Street of the West", home to the Federal Reserve Bank of San Francisco, the Wells Fargo corporate headquarters, and the site of the now-defunct Pacific Coast Stock Exchange.[138] Bank of America, a pioneer in making banking services accessible to the middle class, was founded in San Francisco and in the 1960s, built the landmark modern skyscraper at 555 California Street for its corporate headquarters.