Research Paper 211, May 2008, viii, 109 pp.  This report presents a method for determining the timing, patterning, and forms of gentrification and residential neighbourhood upgrading between the 1960s and 2001 in Montreal, Toronto, and Vancouver, using census data. The resulting maps show a clear geography of gentrification in each city, whereby the process starts in a few core areas and moves outwards into adjacent neighbourhoods, as well as a “gentrification frontier” in each city, where gentrification is likely to occur in future. The authors also identify the main forms of gentrification (deconversion of older housing stock, new construction, and the conversion of non-residential buildings to housing) and the way in which these forms combine to produce gentrified neighbourhoods in each city. They note that although new construction presents an opportunity to mitigate the problems caused by gentrification, this opportunity has not been seized. If present trends continue, the inner cities of Canada’s three largest cities will become the preserve of elites, while low-income households are forced to occupy less accessible fringe locations, a situation that contributes to social exclusion