The Psychological Services and Training Center is housed on the University of Washington campus in Guthrie Annex I, which is located on 15th Ave NE, one block south of the NE 40th St and 15th Ave NE entrance to the University.
From Interstate 5
Take the 45th St NE exit and head east. Turn right on 15th Ave NE. The clinic is located six blocks south on the left hand side of the street, near the corner of 15th Ave NE and NE Pacific Street. Metered parking is available west of 15th Ave NE, or you can pay for on-campus parking by stopping at the gatehouse located at NE 40th St and 15th AveNE and ask to park in lot C8.
The University campus is served by numerous Metro bus routes, as well as a few Community Transit routes.
A more detailed campus map is available here (GA1, 12-J).