I used to see signs similar to this one in cell phone refurbishing factories when I was a human resources staffer.
Truthfully, D.C. should have long ago been purchased by eminent domain. It is 68 square miles of land and water, and if it was entirely US government land, except for foreign embassies, it would have some huge advantages.
1) All transport in the district except for VIP and foreign embassy vehicles would be public transport. A secure supply truck route would preclude truck bombs. So almost no traffic and far less air pollution. Heavy trafficked areas would have covered moving sidewalks similar to many airport concourses. Therefore there could be significantly greater public access.
2) The Watergate hotel district, restaurants and other retailers would all be by concession.
3) All the ghettos would be bulldozed, so there would be abundant room for parks, memorials, amphitheaters, and underlying all would be new infrastructure.
4) Since no one could legally loiter in the district, street crime would be reduced significantly, though not much would change with white collar crime.
5) Management of the district would no longer be done by a corrupt government, but by an appointed city manager.
I used to see signs similar to this one in cell phone refurbishing factories when I was a human resources staffer.