This three-story courtyard house was a project done in the 1980's in which a professor from Tsinghua University worked on. The idea of the house was to try to renovate the living conditions of traditional one-story courtyard house in Beijing that had been crowded in the past due to density. Traditional one-story courtyard house in Beijing used to be for just one family and when it started to be inhabit by more than one family at a time certain problems emerged like sanitary and health issues, and the quality of the place. This house uses around the same area of a traditional one-story house to provide housing for multiple families.