The Post magazine has an article on the proposal for a bridge park in DC, modeled somewhat on the High Line in NYC. It would cross the Anacostia river on old bridge piers, connecting the poorer Anacostia neighborhood with the richer Capitol Hill neighborhood. One of the big concerns is the likely gentrification of Anacostia, the driving out of lower-income dwellers and replacement by richer yuppies.
It strikes me that this gentrification is the story of America. Developers, like the English, see land which isn't being used to its maximum given current economic and technological conditions, acquire the property by hook or crook, and resell it to new people for a profit.