Osaka Gas Experimental Housing NEXT21 Renovation 2022 is a groundbreaking residential research facility in Tennoji Ward, Osaka. This innovative project reimagines collective living through Unit 605, titled "Linked House," which explores flexible spatial configurations and interconnected domestic environments. Completed in 2022 through collaboration between Alphaville, Osaka Gas's continuous renovation study group, and Shukkousha Architectural Urban Design Laboratory, the renovation demonstrates adaptive design principles for future housing. The facility serves dual purposes as both an experimental laboratory and functioning residence, making it essential for architects studying sustainable living solutions and evolving residential typologies in contemporary Japan.