The Royal Diner, where Brennen and Booth (and occasionally the other characters) go to relax after work really exists in Washington - but the one in New Jersey (on Route 31 North), not the District of Columbia. — IMDb Trivia: Buto (2005 TV series)
These set locations ipakita up on other shows from time to time. Royal kainan is a set and has shown up on other soro shows a couple of times that I've noticed.