The purpose of this study is to investigate the sustainable residential system of a habitat that changed into a town for senior citizens by analyzing the management system of a residential organization, a proprietary company and common facilities. The authors clarified that the following items are necessary for a sustainable residential system for such habitats: 1) Long-term contracts of houses and lots by real-estate agents allow of different generations. Thus it makes a chain of the support from younger to senior generation.2) A proprietary company should be permanently established within a habitat in order to strengthen its cooperation with the residents of the habitat.3) A proprietary company should ensure the availability of space, ensure that a sustainable lifestyle is maintained, and support cultural exchange within a habitat. The comprehensive residential management system of a proprietary company should warrant the security and safety of its residents.
