The Mandate period in Lebanon (1920–1945) left its undeniable mark on Lebanese urban planning and architecture. This mark is clearly visible in the capital Beirut, through the organization of the city center, modeled after the Place de l’Étoile in Paris (Davie in Urbanism: imported or exported? Chichester, pp 206–229, 2003a), as well as through a set of typical neighborhoods, part of which was studied by Robert Saliba. This period, however, remains less exposed in Tripoli, despite the presence of a vast and fairly preserved urban fabric dating back to the Mandate era. Thus, to compensate for this structural lack in the study of the urban and architectural development of this period in Tripoli—the second city of Lebanon, a program, designed for the documentation of neighborhoods and buildings dating back to the 1920–1940s, was launched. No less-fewer than 280 residential buildings were identified, with a vast majority that was fully surveyed (This work was carried out by the author and his students between 2014 and 2024 as part of the architectural heritage workshops at the University of Balamand (ALBA).). This essay will provide a quick overview of this research work in its broad outlines as well as a set of conclusions regarding the architectural development of the city between 1925 and 1945.