[bombcar]

The quadplexes have to age and trickledown to being boring housing stock; around here the apartments and quads are going for about the same as older stand-alones and only a bit cheaper than new stand-alones. And when you factor in the usual HOA cost the payment ends up being the same.

[davidw]

In housing the term is 'filtering', which is different from 'trickle down'.