Condominium 1

Condominium 1 was the first unit in the Sea Ranch development on the Pacific coast of Sonoma County, California. The complex was designed by Charles W. Moore, Donlyn Lyndon, William Turnbull, Jr. and Richard Whitaker of the MLTW partnership in 1963-1964, and was built by contractor Matthew Sylvia in 1965. The timber-framed structure overlooks the Pacific Ocean. It has been described as one of the most significant architectural designs of the 1960s in California.

The 10-unit structure was Moore's first major work. The design was inspired by barns and other farm buildings in the region and, with the help of landscape architect Lawrence Halprin, was built to take into account the local ecology. It exemplifies Moore's "shed style" with single-pitched roofs, board siding, and plain detailing. The style, with its emphasis on a partnership with the site, was a break from the International Style. The design principles established by Condominium 1 included the use of what Moore termed aedicules, small intimate spaces defined by four columns and a canopy, and by "saddlebags", small projections of the interior space to the exterior that provide a view or a contemplative space. The units are arranged with horizontal and vertical viewlines through the space.

The condominium was featured in an extensive public relations campaign to promote the Sea Ranch development and appeared in Newsweek, the New York Times, Life, as well as design magazines such as Perspecta and Japan Architect. It received a design citation from Progressive Architect, a California Governor's Design Award in 1966 and an American Institute of Architects Honor Award in 1967. In 1991 it received the AIA Twenty-five Year Award and Moore was awarded the AIA Gold Medal. The structure was placed on the National Register of Historic Places in 2005.