Take it from a girl who worked in restaurants in LA: NEVER EAT AT ANYTHING LESS THAN AN “A.” In some cases, even then you’re pushing your luck.
So, this just happened. My co-worker, a germaphobe, went down to Sansai to pick up some sushi to go. She ordered and she paid. Then, while she was actually standing there waiting for her food, a public health official ripped down the “A” rating for cleanliness and replaced it with the “B” rating seen here.