As sea level rise, erosion, and heat intensification threaten coastal cities, architects must expand their role beyond conventional building practice. This course presents a professional and research-based transition from traditional architectural work in Miami-Dade to a hybrid model integrating material science and marine ecology to contribute to sustainable infrastructure. Grounded in research focused on transforming invasive marine biomass into cementitious material, the session explores how waste can be formulated into material for building systems and shoreline stabilization. Through laboratory testing, field research, and prototyping, the work evaluates compressive strength, thermal performance, and waste management to demonstrate how material innovation directly impacts public health, safety, and welfare. By localizing material production and reclaiming ownership over building systems, architects can create gateways to circular economies that strengthen both ecological and community resilience.