Building 15 at Sophia University's Yotsuya Campus opened in the fall of 2022 as a hub for adult education and community exchange, with the keyword "Transforming the city into a forest," aiming to contribute to achieving the SDGs and realizing a decarbonized society, as well as becoming a sustainable landmark for the region. Designed and construction by Sumitomo Forestry, this three-story fire-resistant wooden building utilizes "Kigurumi FR®," an original pure wood fire-resistant laminated timber made from Tama-grown cedar, for its main structural components. The facade, covered with a cross-shaped wooden lattice, is concept design that expresses the founding principles of Sophia University: "diversity," "interaction with others," "truth," and "tradition." The first floor will house a café open to the public, and as part of community contribution activities, space will be provided to nearby neighborhood associations for use as a disaster prevention warehouse. The second and third floors are used as classrooms for the "Professional Studies" course for working adults. Our company was responsible for design, layout, construction of the third floor, which is used as a classroom for the adult education course. Aiming to create a space that fosters wisdom through gathering, learning, and conversation, we also connected the story from the architecture to the materials that make up the space, and concept design using Nishikawa timber (cedar and cypress) from Hannō, which, along with Tama timber, has been used to build the city of Edo.