What exactly is "affordable" housing?

The city of Falls Church, Virginia, is a toney DC suburb. The median home value is $670,192 and the median income is $111,461. Not to worry. Falls Church has "affordable housing." That means it gets government money to pay builders to design/build or remodel homes for households whose income is at or 80% of the median income level of the DC metro area which in 2010 was $85,198. You'd still have a huge gap if you qualified to move into Falls Church affordable housing, and every good Democrat knows it is the gap that is the problem, not the income.

I can't tell if it's just the VA taxpayer who is paying for this or if it is all taxpayers in the U.S. But I think I qualify if I want to move to Virginia--although I suspect there is a waiting list. I'm certainly living below the media income level of the DC metropolitan area.
Falls Church Affordable Housing Policy
Senior Housing