Mas sake is located in San Fransisco's Marina district, on the famous "curvy" Lombard Street- at Fillmore.Mas sake opened in 1999 and staked it's claim as a "7 day a week"party destination that draws crowds from all over of the Bay Area, not to mention worldwide.Mas sake Freestyle Sushi is a Japanese/Mexican fusion restaurent serving non-traditional, creative shushi and much more.