i can do you one better: 1/3rd each of apartment buildings, quadplexes, and row homes.

This is how they're building a new development in my town and while it's pretty fucking sad to see how much more space the low density housing gets, it's so fucking good to have a mix of densities near each other. It means you don't get the extreme segregation between young/old, rich/poor, and native/foreign people, and that if you want to move to a different density of housing you don't have to leave behind all the people you know.