At the end of the Second World War, enriched by US investments and an oil boom, Mexico had its first demographic boom, in which the primary destination for rural immigrants was Mexico City. , a famous architect at time, was charged to build its first large-scale public housing project. Built for the (the National Pensions office, today ISSSTE), the (or ) (1947–50) in the Colonia del Valle and the (or ) (1951–52) in the , introduced formal ideas from Le Corbusier's into the urban fabric.