Bio Basilica is a grassroots community intervention that disrupts the linear “extract-waste” cycle by decommodifying urban residue. The communal food hall functions as a metabolic engine, harvesting starch-rich waste as a primary feedstock for biopolymer experimentation. Regional construction waste is brought to the site, salvaged, and prepared for reuse. We are confronted with our overwhelming level of consumption with the building materials stored and displayed within the chapel. By utilizing these recovered and emerging material streams, we can establish an architectural materiality grounded in the reuse of regional waste as feedstocks and collective stewardship.