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The inner suburbs are contained within the former municipalities of York and East York.[1] These are mature and traditionally working-class areas, consisting primarily of post–World War I small, single-family homes and small apartment blocks.[1] Neighbourhoods such as Crescent Town, Thorncliffe Park, Flemingdon Park, Weston, and Oakwood Village consist mainly of high-rise apartments, which are home to many new immigrant families. During the 2000s, many neighbourhoods became ethnically diverse and underwent gentrification due to increasing population and a housing boom during the late 1990s and the early 21st century. The first neighbourhoods affected were Leaside and North Toronto, gradually progressing into the western neighbourhoods in York.[citation needed]