This document analyzes demographic changes in Chicago's Pilsen neighborhood between 2000 and 2010 as a case study of gentrification. It finds that Pilsen experienced urbanization in the 1950s as its Mexican population increased from 0.5% to over 50% by 1970. While Pilsen maintained its identity as a hub for Chicago's Mexican community, rising property values and developers' interest in the neighborhood indicate the onset of gentrification. Maps of median income, property values, and percentage of Hispanic residents from 2000 to 2010 show Pilsen experiencing increasing income and property values alongside a declining Hispanic population, suggesting gentrification is transforming the working-class immigrant area.