Spatial environments are often designed without meaningful input from the people who inhabit them. From our design studios at the university to city streets, design decisions are frequently made by distant authorities, leaving communities with little agency. Co-Design Canvas reimagines this relationship by positioning generative AI as a tool for collaboration rather than control. It enables a wider range of voices to participate in envisioning futures for shared spaces. The project explores how technology can support dialogue between competing interests—residents, designers, policymakers—while recognizing that no algorithm can resolve deep ideological divisions.