are made in many different architectural styles which may be of European, American and International architecture and which vary in size. Suburbs can be found in Guadalajara, Mexico City, Monterrey, and most major cities. Lomas de Chapultepec is an example of an affluent suburb, although it is located inside the city and by no means is today a suburb in the strict sense of the word. In other countries, the situation is similar to that of Mexico, with many suburbs being built, most notably in Peru and Chile, which have experienced a boom in the construction of suburbs since the late 1970s and early 80s. As the growth of middle-class and upper-class suburbs increased, low-class squatter areas have increased, most notably "lost cities" in Mexico, campamentos in Chile, barriadas in Peru, villa miserias in Argentina, asentamientos in Guatemala and favelas of Brazil. Brazilian affluent suburbs are generally denser, more vertical and mixed in use inner suburbs. They concentrate infrastructure, investment and attention from the municipal seat and the best offer of mass transit. True sprawling towards neighboring municipalities is typically empoverished – (the periphery, in the sense of it dealing with spatial marginalization) –, with a very noticeable example being the rail suburbs of Rio de Janeiro – the North Zone, the Baixada Fluminense, the part of the West Zone associated with SuperVia's Ramal de Santa Cruz. These, in comparison with the inner suburbs, often prove to be remote, violent food deserts with inadequate sewer structure coverage, saturated mass transit, more precarious running water, electricity and communication services, and lack of urban planning and landscaping, while also not necessarily qualifying as actual or slums. They often are former agricultural land or wild areas settled through squatting; suburbs grew and expanded due to the mass rural exodus during the years of the military dictatorship. This is particularly true of São Paulo, Rio de Janeiro and Brasília, which grew with migration from more distant and impoverished parts of the country and deal with overpopulation as a result. Malaysia In Malaysia, suburbs are common, especially in areas surrounding the Klang Valley, which is the largest conurbation in the country. These suburbs also serve as major housing areas and commuter towns. Terraced houses, Semi-detached houses and shophouses are common concepts in suburbs. In certain areas such as Klang, Subang Jaya and Petaling Jaya, suburbs form the core of these places. The latter one has