chad kellogg and matt bowles of AMLGM have envisioned ‘urban alloy’ as a redefinition of the typical residential tower typology. the project proposes habitable spaces in leftover sites surrounding transportation intersections, such as elevated train lines and freeways. wanting to optimize a heterogeneous and highly linked set of living environments, the concept uses specified materials and makes the most of being positioned above these set systems. the design offers an alternative to current urban renewal based modes of densification through an exploration of symbiotic re-purposing of air rights above transportation existing corridors in new york.taking advantage of the benefits for having housing located close to transportation hubs, the chosen test case is the intersection of the lirr and the 7 train. a wide range of living conditions are offered within the one development. the programmatic options are set within a blend of floor plate geometries, transitioning from cylindrical to triangular from the base to the top of each tower. a composite or alloy of multiple flexible systems optimizes the skin so that each point has unique exposure, and is deployed on a grid that follows the direction of the surface.