In Tünel, a residential building from the early 20th century was transformed into a company headquarters and showroom. Due to its status as a historical monument, the intervention was limited. The ground floor was designed as a public space with a shop, showroom, and temporary theater, using raw materials to reflect the street’s texture. In contrast, the upper floors—dedicated to the company’s internal functions—featured refined detailing and advanced technologies. Despite its evolving uses, the ground floor consistently functioned as a vibrant public interface.