OMO7 Yokohama by Hoshino Resorts has opened in BASEGATE Yokohama Kannai, in front of JR Kannai Station, utilizing the former Yokohama City Hall administrative building as a legacy hotel. The hotel's first-floor OMO Base, based on the concept of "Hamaism," features the "Hamaism Collection," an exhibition showcasing Yokohama's culture and history. With the cooperation of the Yokohama City Urban Development Bureau and the Yokohama City Hometown History Foundation, our company was responsible for planning, basic concept, design, production, and construction. "Hamaism" embodies the spirit of Yokohama, cherishing authenticity and preserving the old. In this project, we designed it as a gradient of experiences, from diverse Yokohama culture to the deep memories of its architecture. At the entrance to the exhibition, playful models of Neapolitan spaghetti and ice cream are displayed, along with symbolic placements of Yokohama-born culture such as railways, gas lamps, and Hamatora (Yokohama Traditional). These catchy features stimulate curiosity and draw the viewer's gaze further inside. Furthermore, after exhibits such as the Noge Miyakobashi Shopping Street, which embodies "Not Scrap & Build" (*), the narrative unfolds into a world infused with respect for the renowned architect Togo Murano. Taizan tiles and brass door handles inherited from the former Yokohama City Hall have been reassembled as living pieces. In the design of the fixtures, the lighting plan has been thoroughly considered, and it has been meticulously designed to blend in with the tone of the architecture while making each exhibit stand out in the most beautiful way. *Not Scrap & Build: An approach that preserves and utilizes existing architecture while making the most of it, rather than "Scrap & Build," which involves demolishing old buildings and rebuilding new ones.