Hilton San Francisco Union Square is a skyscraper hotel located several blocks Southwest of Union Square. The 46-story and 493 ft Tower I was completed in 1971, with the addition of Tower II at 348 ft and 23 floors finished in 1987. The complex is currently the largest hotel in San Francisco. The two towers total 1,915 hotel rooms, and is one of the tallest structures representing the Brutalist architecture. From the Hilton Hotel you will be able to explore Union Square, the Theater District, Chinatown and Nob Hill.