At the time of its completion, Japanese-style wooden buildings were still common and highly valued, but the Shibakawa Building, a reinforced concrete structure featuring South American Mayan and Inca decorations, was born. Prior to the Western-style building, the roof was wooden and the walls were simply clad in copper. Concerned about fire safety, Matashiro replaced the building with reinforced concrete, which offers superior earthquake and fire resistance. While originally intended for private use, Matashiro, who had an interest in education, chose to use the building as a bride's school, Shibaransha Kasei Gakuen. From 1929 until its closure in 1943, the school hosted approximately 3,000 young ladies, known as "ito-san," who had graduated from prestigious girls' schools in the Kansai region. It is also said to be the beginning of women's junior colleges. Currently, events are held irregularly on the rooftop terrace, and various restaurants and bars are located here to satisfy the discerning tastes of Osaka residents. The building is attracting much attention for its innovative approach to new possibilities.