Unknown to most, the buzzy SoMA neighbourhood where most of these winemakers work was once called South of the Slot (referring to the cable car line that ran down the centre of Market Street) and was home to more than 100 wineries in the late 1800s, including J Gundlach and Co, California's oldest continuously family-owned winery (now based in Sonoma).
BBC: San Francisco��s urban wine renewal