Same here (Montevideo, Uruguay) - the eastern part has the most expensive neighbourhoods (also, the south part of the city is more expensive than the north, but that's because the southern part is the waterfront).
Another interesting thing is that the hill to the west of downtown, which should be the most expensive part of the city if it followed some European city pattern (it has a beautiful view, and even a golf course), is actually one of the poorest (same for Río de Janeiro, which has the "favelas" in the hills IIRC).
Another interesting thing is that the hill to the west of downtown, which should be the most expensive part of the city if it followed some European city pattern (it has a beautiful view, and even a golf course), is actually one of the poorest (same for Río de Janeiro, which has the "favelas" in the hills IIRC).