Onsen is our twist on a traditional Japanese bathhouse, or Onsen ( hence the name ). Our space is a Restaurant, Six treatment rooms, a Sauna, a Steam Room and a Communal bath. You will be able to enjoy Acupuncture, Massage, lots of Teas and a full Menu of plant driven dishes. Onsen is built in a restored brick building that was formerly an auto body garage. We are located in the Tenderloin neighborhood, downtown San Francisco.