This spacious penthouse apartment, located on the top floor of a 5-star hotel St. Regis, San Francisco, is a striking example of cutting edge luxury. The duplex is more like a grand castle, situated at a dizzy height with an amazing view of San Francisco and the ocean. It is built from three separate penthouses, combined into the 20,000 square foot giant with 6 bedrooms, 7 bathrooms, 4 powder rooms, 2-storey foyer, 2 laundry rooms and 6-cars valet parking.