Urban Thinning redefines elevated infrastructure as a catalyst for spatial and social regeneration. Often treated as barriers, such structures fragment cities and disconnect public life. This design proposes a dual-scale approach: urban mappings reveal latent cultural, ecological, and industrial networks, while architectural interventions activate sites along and beneath the infrastructure. By layering memory, adaptive use, and community programs, the project transforms residual voids into civic interfaces—a transferable prototype for infrastructural reuse through architectural thinking.