I am the Kat that Walks By Itself

next door - not a usage I have seen before (neighbours yes, but next door would be literally one house either side on the same side of the road).

In terms of rentals, I was thinking of the kinds of properties that are often available for visitors (from overseas) who are there for business/academic reasons, with a family. Such a family might be there for 6 months, or maybe a year, depending on the contract that the relevant individual is on. Similarly, rentals in some suburbs are chosen by people who want to get their kids into a particular school zone (is that a relevant concept here?), and thus quite new middle class (or climbers) suburbs will have quite a few rentals. Certainly, my kids have friends whose families are renting in brand new houses in recently built suburbs. The other group that I can think of that might have a house in a new suburb are military families, although that depends on the location of the suburb.

Also - I really appreciate you taking the time to answer, it has been really helpful.