" 'mixed' neighbourhood, apparently a social experiment aimed at promoting integration where there's a lot of public housing"

Ya, that's a new shtick by the bleeding heart liberal types... their stated opinion is that negative views of public housing are based solely on myth and only occur because of stereotyping the poor/immigrants/etc.  By "mixing" the economic make-up of neighbourhoods, they believe that the existence of problems inherent to the residents will be debunked.