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54 Fourth St.
San Francisco, CA, 94103, United States
TEL: (415) 986-4400
TEL: (800) 227-3804

Opened in 1913 as the Keystone Hotel, the Mosser—purchased by composer Charles W. Mosser in 1981—still retains its Victorian style in the lobby with marble floors, wrought-iron banisters, and rich wood paneling. In contrast, the 166 guestrooms have a modern sensibility: platform beds, brown and black linens, and bright accents of red, green, or pink. While the rooms are small and many share baths, the hotel is ideal for budget-minded travelers and is conveniently located within walking distance of Union Square, Moscone Center, and a BART station. Amenities include the adjacent Annabelle’s bistro and a state-of-the-art recording studio.

Room to Book:

Rooms facing Fourth Avenue are larger and brighter than others; just keep in mind that they’re also noisier because of street traffic.

Insider Tip:

Guests often complain that the window blinds are inadequate, so if you prefer a very dark room at night, request an extra blanket to cover the window.


Open / Closes
  • Adjoining Rooms
  • Accessible by Public Transportation
  • Business Center
  • Concierge
  • Dry Cleaning
  • Family Friendly
  • Green/Eco-Friendly
  • Handicapped Accessible
  • Luxury Boutique Hotel
  • Laundry Service
  • Maid Service
  • Parking Available
  • Room Service
  • WiFi

Number of Rooms: 166

Number of Suites: 1

Year Opened: 1913



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