The rubber boom of the 1880s caused a severe change in the architectural face of Iquitos. Foreign and rubber barons brought with them the influence of countries like Spain, Portugal, France, Germany, and descendants as Sephardim. Jose de Jesus Reategui and a young group built the main features of the urban city in the years of boom, including the Iglesia Matriz de Iquitos. In the Iquitos popular belief of the 19th century, iron was considered less humane and aesthetic, but Gustave Eiffel got the Casa de Fierro became an attraction in the city, although historically the prefabricated building was not designed to Iquitos. Baroque and Rococo style also influenced the architecture of Iquitos, and defense against the rain was another prominent feature given for buildings. About 90 buildings are declared architectural heritage of Loreto.