Catalina is conceived as a neighborhood-scale collective housing project on a mid-block lot, balancing identity and ecological responsibility. Its morphology in locally sourced exposed brick, under a portico system, ensures thermal inertia and warmth, integrating green terraces as climatic and biodiversity regulators. The project stands out for its social commitment, prioritizing regional materials and recycling programs that connect it to its community. It is a synthesis of constructive ethics that transforms technical efficiency into a responsible living experience.