This project tries to redefine urban vitality in Taipei by finding out the physical indicators which compose the urban form and revising existing planning system to stimulate integrated urban regeneration. The most vulnerable communities resettled tenements are chosen as the research focus. The suggestions in this project improve current Taipei urban regeneration into the collaborative one towards to public interests and the city’s identity. The proposed planning system with a shifted role for public/ third sector could therefore concern the whole urban system and neglected deteriorated communities more, and several rules as design guidelines of different typologies in Taipei's mixed-use context are concluded. Integrating planning and design, a regeneration project explains the possibly urban form that maintains vital mixed-use development in the area.