This urban itinerary explores the western tram route of Avenida Diagonal in Barcelona, illustrating the city's urban development project that expands into previously underdeveloped areas. The tour is part of a series that follows the Diagonal as a structural axis of the city, focusing on the western sector where urban growth adhered to a land colonization approach amid modern development. Participants will analyze the progressive transformation of this space and its integration into contemporary metropolitan life, highlighting the tensions between urban planning, architecture, and land use. The tour begins near the L3 metro line, at the Zona Universitaria stop, right in front of the Faculty of Economics and Business.