Great Article  and illustrations about  Social Housing in Vienna.
Unfortunately   Canadian politicians both Federally and Provincially have never looked at affordable   shelter as a right not as a commodity. as in the case in much of .Europe.
Austria  and its capital city Vienna municipal authority  put Canada's  lack of a ongoing  housing strategy to shame.
There was an excellent British Documentary  about  clearing the slums from  London
in the late nineteenth century and how the London County Council was established to provide social housing for the poor.  
Philanthropists at that time including the Rothschild and Peabody Families  also built  social housing units in many parts of London.
I like my grandparents and parents   lived in one  of  "the Buildings"   as they were then called..
 Its all social  history now.