Evidence-Informed Renewal Zoning for Sustainable Urban Heritage Tourism: A Comparative Study of the Kuanzhai Alley and Daci Temple Historic Districts in Chengdu, China

Rapid renewal and tourism-driven commercialization intensify tensions between heritage conservation and redevelopment in historic districts, and decision-oriented tool chains that translate Historic Urban Landscape (HUL) layering into change management remain limited. Taking Chengdu’s Kuanzhai Alley and Daci Temple historic districts as comparative cases, this study traces four benchmark time slices (1911, 1933, 1994, and 2025) using georeferenced historical maps, remote-sensing imagery, planning base maps, archival documents, and field checks. An auditable morphological-evidence coding manual is developed for street–alley skeletons, plot integrity, redevelopment intensity, interface commodification, connectivity, and heritage-anchor integrity, and it is triangulated with resident-population and commercial-mix evidence to interpret regeneration mechanisms. The results show that morphological continuity can coexist with social discontinuity. Kuanzhai Alley retains a legible street–alley backbone, while plot/operational consolidation and intensive commodification coincide with resident withdrawal. The Daci Temple district experiences broader street–plot reconfiguration and upscale clustering that heightens landmark visibility but challenges contextual integrity and community continuity. Based on these mechanisms, four renewal zoning prototypes and zone-specific monitoring indicator domains are proposed to operationalize HUL’s feedback loop and to support balanced governance of heritage, everyday life, and sustainable urban heritage tourism.