Matsunami Mitsutomo designed the Apartment with a strict budget in Katayama-cho, Suita-shi, Osaka, Japan. The Katayama Apartment is a small apartment block built on a site of 110m² and consists of 7 stories, 2 apartments per floor and a total of 10 apartments. On the north side is located the elevator, stairs and the passage with the basis being a flat plan. A high ceiling room was integrated and, bringing together 3 plan types and finishing materials, a combination of 10 patterns was fashioned. By these means, a space offering both diversity and economic efficiency was obtained. It is these elements which makes the characteristic façade and maintains no apartment vacancies to date.