Boston Avenue was a street in Washington DC where, at its intersection with 8th Street, a PhiCorp warehouse containing millions of painkillers was located. To distract a police officer for long enough to render him unconscious in 2011, Gwen Cooper asked him where Boston Avenue was, and erroneously asked if it were Boston Road or Boston Street instead. (TV: Dead of Night)
Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map at right is probably a good indicator of the DWU location of Boston Avenue.