Léon Krier points out the importance of architecture and building planning in cities, and how this is linked with the relationship between planning and economy. He mentions the fact that, what we look around us, planned projects have been done by very few people. After that, Krier shares the principal master planning models; Networking model, in which exists geographic interaction, and cities within the cities model, where beside functionality, it is also profitable. Also, he shows an overview of Guatemala City and its patterns, mobility, and structure, to further recommends a model of expansion and organized growth. He proposes a Federal City project and details the main factors for its implementation.