This was a big deal because at that time, the LGBTQ community was under fire. Not only did this allow for bar patrons to look out into the streets of the Castro District, but allowed for the public to look into the bar itself. Twin Peaks is known for its large full length, open plate glass windows considered to be the first gay bar in the entire nation to do so.
The Twin Peaks Tavern was first established in 1935, but came under new management around 1971 in the form of Mary Ellen Cunha and Peggy Forster, both of whom are lesbians.