This is a case documented in Collaborated Services - Social Innovation and Design for Sustainability, edited by François Jégou, Ezio Manzini.
"...The principle rests with establishing one or more apartments as common spaces to allow collective spaces and slowly evolve the existing building toward a housing cooperative..."
A friend of mine has mobility issues and he is home alone most of the time while his wife, his sole caregiver is at work. They live in an apartment building where there are other seniors who are alone often as well. I think if they have collective rooms in their building, it would encourage social interactions for them.