Urban mansions are exceptionally large and rich for a medium-size Latin American town and constitute an example of the transition from Baroque to Neo-Classic. The Sanctuary of Atotonilco is a remarkable architectural complex that illustrates a specific response, inspired by the doctrine of Saint Ignacio de Loyola. Both the town and the Sanctuary, intimately linked, played a significant role in the process of Mexican independence, with impacts throughout Latin America. Criterion (iv): San Miguel de Allende is an exceptional example of the integration of different architectural trends and styles on the basis of a 16th century urban layout. The legal system in place ensures the adequate protection of the property and the town and the Sanctuary exhibit an acceptable state of conservation.