The Fairfax Times published an interesting article on the "ripple effects" of Fairfax County foreclosures earlier today. I don't have much to add on the topic, as I'm not the expert on these kinda things (he's over here), but I did find one particular paragraph to be especially enlightening:
In Fairfax County, foreclosures are especially concentrated in Springfield, Herndon and Centreville. Some of the homes in those areas represent recent purchases by landlords who converted the residences into illegal [Ed.:—Allow me to re-iterate: These are old single-family—as in around 2,000 sqft—homes that are illegally converted into apartment buildings.] boarding houses, often filled with illegal immigrants.
Accelerated attempts by county officials to crackdown on such residences [Ed.:—See here] may be having the unintended consequence of forcing the homes into foreclosure since landlords are less able to make mortgage payments with the loss of tenants.