Contemporaneous urbanization dynamics of coastal borders share common and specific traits acknowledged in different Iberian-American areas. This article discusses the analysis of this process for the case of the commune of Puchuncaví, in Region Five, Valparaíso, between 1992 and 2012. This was carried out from a theoretically informed description approach, whereby a site condition and real estate project morphology analysis was preceded by a synthesis process through a graphic model. The analysis suggested that real estate development-mostly second residences-resulted in new urban forms in the coastal border, framed within a broader city-less urbanization process that is becoming a feature of the urban macrozone of Chile's central area.