Cleft House, a Venice, CA project by C/ARC, came with an intimidating litany of heavy budgetary, governmental and spatial constraints. C/ARC’s innovative Adaptabode® partial pre-fab system maximized material efficiency and textural appeal to create a sensuous, efficient and spacious modernism built for only $200/sf on the tiny 30’x90’ lot. Footprints of two existing cottages were partially retained to avoid punitive updates to their non-conforming setbacks. Although pivotal artifacts of the old buildings pierce the new structure, C/ARC’s factory-built, renewable, recyclable, post-consumer waste steel framing stands astride and hides their shells. This soaring steel skeleton went up so fast, C/ARC received numerous calls from other architecture offices asking how they did it. Cleft’s highly functional green design also incorporates “metal sandwich” panels. Highly-insulated R-30 recycled foam on the inside, pre-finished automotive grade steel on the outside, these panels interlocked to the frame and each other for rapid installation on exterior walls. The typical blank common-wall problem of duplexes or townhouses morphed into the defining element – a cleft or light-box-like void of translucent acrylic – bringing three stories of luminosity and ventilation into an otherwise dark moment while expanding usable interior space and providing privacy between two units.