people leave their homes because of urban blight. for example in Cabrini greens the individuals that had to live in that area eventually moved. why u ask well the situations accruing in that area where bad really bad people getting shot, kidnaped, robbed etc. now there is only I believe one building left standing from the ones that belonged there back in the days. not only in the city of chicago does this occur but in many other places
Resurrection of the Past 
Javier–
There is an art installation going on right now at Cabrini Green, as they demolish the last of the buildings.
Check this out and let me know what you think: http://www.projectcabrinigreen.org/about.php
“On March 28th, two days before the beginning of the demolition, 134 self-contained, battery-powered LED modules were placed inside 134 of the building’s vacated apartments. The lights will blink every day from 7pm to 1am CST, for the four week duration of the demolition, and will be gradually erased with the building. Each blinking light has a unique pattern. These patterns are a visual translation of poems written and recorded by the youth who attended workshops developed and instructed by Tichy, Appel, and students from the School of the Art Institute of Chicago.
The project aims to highlight the significant moment of the demolition, while giving voice to young people, enabling them to reflect on social issues related to their communities. The idea to collaborate with youth derived from the wish to empower them through a creative experience.”
Jessi