The Collective Buildings of the Caja de Seguro Obrero Social, since its gestation and construction between 1939 and 1941, have become benchmarks of a distinctive architectural modernity of the Norte Grande of Chile and that is evidenced by the diversity of authors who have approached them from various study optics. In order to establish the state of the art around the Collective Buildings, a review of the documentary sources in which they have been addressed has been carried out. The analysis and classification of these records shows that they have been the most widely disseminated works of architecture in northern Chile, providing an architectural, urban, historical and social imprint that maintains its validity and that still continues to constitute a valuable research case.