L'Oreal Japan, the Japanese subsidiary of the world's largest cosmetics company, L'Oreal Group, has undergone its first major renovation since relocating its headquarters to Shinjuku Park Tower in 2006. The renovated office, named "Beauty Valley" based on the concept of "En", is imbued with the desire to create a place where beauty is born that connects the country of Japan, customers, business partners, and employees. The four seasons (spring, summer, autumn, and winter) are used as concept design themes for each area, and Japanese craftsmanship is used in furniture and decorations, incorporating Japanese beauty throughout. In addition, about 4,400 of the company's products, including about 60 types of eye shadow, foundation, and lipstick, were upcycled and used for paint, light shades, tiles, etc. In pursuit of sustainable beauty, the office has been designed to fully express L'Oreal's beauty by installing product display fixtures similar to those in stores. In addition, the office has been designed with attention to detail in light, sound, materials, etc., and in accordance with LEED standards, an international certification for sustainable buildings that guarantees energy efficiency and waste management. Our company participated in this project as the general construction company for interiors.