Castro Country Club at 4060 and 4058 18th Street. Opened in 1983 for gay men and lesbians who like the bar scene but are now sober. In 2010, the club was home to around 30 AA, NA, etc. groups. Each week around 750 people attend the meetings. Note the 3 pink triangles in the window with capital C letters in them. Door sign says closed but it is still in existence today.
