Lots of studies in the animal kingdom on group dynamics in animal groups and colonies.
Anything on human societies especially housing complexes and neighbours in western first world societies?
Does familiarity between neighbours breed contempt? Which is better advice to follow? Keep your neighbours at a distance or try and be best friends forever? Are there any social science studies which can explain relationships between neighbours?
I googled “social interactions in public housing” and got a ton of studies. I suppose you could substitute “cities,” “suburbs,” or whatever type of community you want.
Forty years ago in college I studied Jane Jacobs, who was something of a pioneer in that area. She might be a good place to start.
There are anthropological studies of modern Western societies. I’m currently reading Watching the English by Kate Fox. It’s a careful study of how English society works, right down to individual interactions between people. It’s meant for a general audience, not just for anthropologists.