Sean Ross (left) plays video games with his housemate Bastian Ermann while hanging out in the common room at 20 Mission with Henri Roussez (center) in San Francisco, Calif., on Saturday, December 13, 2014. The co-living house is home to around 45 people, many of whom are entrepreneurs or working in the tech industry. Most of the residents have their own room, but share the common room, one kitchen and two bathrooms.