Mill Creek's master plan was submitted to the county council in January 1974. A homeowners association was established in December 1974 with funding from United Development to manage the area's security patrol, street maintenance, and other tasks. The initial plan included consist of 4,600 homes, with eventual plans to house 12,000 people, a park, and an 18-hole golf course. Construction began in early 1975 on the golf course and adjoining country club, while the first homes were under construction by the following year. The first set of homes were designed to resemble country residences, with large floorplans and prominent use of wood furnishings, and sold for an average of $65,000 (equivalent to $ in dollars). Tokyu Land Development later re-used these home designs for the domestic market in Japan, where they were sold under the "Mill Creek" brand in the 1990s. The final phase of the original Mill Creek development, consisting of 33 condominiums, was completed in late 2003.