The Top of the Mark is a rooftop bar located at the top of the Mark Hopkins Hotel on Nob Hill at California and Mason Streets in San Francisco, California. Located at the highest point of downtown San Francisco, on fog-free days the Top of the Mark features spectacular views of the financial district, Chinatown, North Beach, The San Francisco Bay, and especially of Grace Cathedral and Huntington Park. In 1939, hotel owner George D. Smith converted the 11-room penthouse on the hotel's 19th floor into a glass-walled cocktail lounge which became known as the Top of The Mark.