Located in Shinjuku ward, Tokyo, the Iidabashi Collective Housing completed in 2002 represents a significant contribution to contemporary residential architecture in Japan. Designed by the collaborative practice of Tsuneyasu Kitayama and Architecture Workshop, this project exemplifies thoughtful urban housing design that responds to the dense Tokyo context. The building demonstrates careful attention to residential quality and community integration within the metropolitan environment. For architecture enthusiasts, this work showcases innovative approaches to collective living spaces and sustainable urban development practices that characterize early 2000s Japanese residential architecture.