Y-1 and Y-2 are residential and office buildings completed in 2006 in Shibuya, Tokyo, representing a thoughtful approach to mixed-use urban development. Designed collaboratively by PRIME Architectural and Urban Research Institute and Masahiro Ikeda Co., Ltd., these structures exemplify contemporary Japanese architecture that balances functional requirements with aesthetic considerations. The project demonstrates how residential and commercial spaces can coexist harmoniously within Tokyo's dense urban fabric. The buildings showcase the architects' commitment to creating contemporary urban environments that serve both practical needs and contribute positively to the surrounding neighborhood's character and vitality.