Trois is a residential apartment building located in Kokubunji, Tokyo, completed in 2009. Designed by architect Mitsuhiko Sato, this modern housing complex exemplifies contemporary Japanese residential architecture. The building's design reflects careful consideration of urban living spaces, incorporating efficient layouts and thoughtful spatial organization. Trois represents the evolution of multi-family housing in Tokyo's suburban areas, balancing functionality with aesthetic design principles. The project showcases Sato's approach to creating livable environments within the constraints of urban residential development, making it a notable example of early 21st-century Japanese apartment architecture.