Six Moon Hill is a residential neighborhood by The Architects Collaborative (TAC) is located in Lexington, Massachusetts. It consists of a collection of Modern houses on Moon Hill Road and neighboring streets in eastern Lexington, designed and built between 1948 and 1950. The area was listed on the National Register of Historic Places in 2016.
With a focus on collaboration the TAC approach was applied to all aspects of the community: design, development, construction, and operation. TAC established a nonprofit corporation and bought 20 acres (81,000 m2) on which to build, which was divided into 29 equally-priced lots of about one-half-acre each. Original house costs were between $10,000 and $22,000. The first houses were designed and built in a modernistic way. The method of design was rectangular, flat-roofed, timber-sided homes, which was typical for residences designed by TAC. The houses are situated on a sloping hill lining a small road that forms a cul-de-sac. Six Moon Hill runs as a consensus-based, collective community in which each member family pays dues and holds two voting shares.
In 1948, a group of TAC architects were looking to move from their rented lodgings in Cambridge and had the idea of building their own community. They found the land in Lexington during a Sunday ski outing. It was purchased from an auto dealer of the Moon Motor Car, and the project was given the name "Six Moon Hill", a nod to the six automobiles found in a barn on the property. It turned out that one of the cars was a Franklin, but they liked the original name too much to change it. In building Six Moon Hill, the goal was not only to build the houses but also to establish an ideal community.