Cubix is a smart design system for retrofitting abandoned factories into affordable, ulation with Al-driven layout optimization, it transforms underused industrial sites into flexible office environments. Through a data-driven backend, Cubix analyses site conditions-light, wind, acoustics-alongside user input to generate optimized layouts. Its modular furniture system, fully 3D-printable and detachable, enables easy on-site customization. By reusing factory infrastructure instead of rebuilding. Cubix minimizes cost and carbon, offering a scalable solution for adaptive reuse and net-zero transformation of urban industrial relics.