 45,258,000 units (96.6%) were used exclusively for living and 1,605,000 units (3.4%) were used both for living and commercial purposes.Of the units used exclusively for living, 10,893,000 (24.1%) were equipped with an automatic smoke detector.As of 2003, 17,180,000 housing units (36.7%) are classified by the Japan Ministry of Internal Affairs and Communication as being located in urban areas while 27,553,000 housing units (58.8%) are located in rural areas.