[quote]single family homes in middle and lower-middle class neighborhoods are likely to see more multi-family renters in 3 and 4 br. houses and more cars in the street, which is perhaps the ugliest form of “density” in previously quiet neighborhoods.[/quote]

This is exactly what I saw happen in my previous community.

When I 1st bought there (early 2003) most houses were owner occupied; by the time I escaped it was probably close to 90% renter occupied. The change really started with the bubble and accelerated through the crash.

I also witnessed a significant increase in crime: drug dealers, pit bulls, much increased police presence and police involved incidents, ghetto birds for starters.