Many cities have mixed-income housing strategies to create a social and economic mix, including London where council housing is peppered in throughout the boroughs.
"Building more densely in the right places will not just enable the delivery of more homes, but will also improve access to jobs and services, while helping to fund desperately needed social and physical infrastructure. It will help people to be active and healthy, by locating more housing within walking and cycling distance of local amenities and public transport access, and by reducing reliance on car ownership. Furthermore, it will help to foster socially and economically mixed neighbourhoods, which are a key part
of maintaining London’s vibrancy and economic success."
"Building more densely in the right places will not just enable the delivery of more homes, but will also improve access to jobs and services, while helping to fund desperately needed social and physical infrastructure. It will help people to be active and healthy, by locating more housing within walking and cycling distance of local amenities and public transport access, and by reducing reliance on car ownership. Furthermore, it will help to foster socially and economically mixed neighbourhoods, which are a key part of maintaining London’s vibrancy and economic success."
-London Housing Strategy https://www.housinglin.org.uk/_assets/Resources/Housing/Othe...