Each time Ron Taylor steps outside the squat brick townhouse he rents in the Manassas neighborhood of Georgetown South, the house next door is a reminder of how things used to be. It’s his old home, now vacant. The yard, where he once carefully carved a planter from a tree trunk, is overgrown with weeds. Taylor, 68, and his wife lived there for about a decade before it was foreclosed on last year. Georgetown South was envisioned as a tony, southern sister for the District’s famous and affluent Georgetown when it was built in 1964. But that was never in the cards for the neighborhood, and it soon became better known for blight and crime. When the foreclosure crisis came, it was among the area’s hardest hit neighborhoods. At the height of the housing bubble, nearly 60 percent of residents were homeowners. Now, about 60 percent rent.