The synagogue is located at:

25701 14th Place South, Des Moines, WA 98198

From I-5, take the South 272nd Street exit and go West. Turn right onto 16th Avenue South.
Take a hard left on 14th Place South. Synagogue is first driveway on the right.
Sign at drive way entrance for Bet Chaverim

mapquest link:
http://www.mapquest.com/maps?city=Seattle&state=WA&address=%5B25522-25701%5D+14th+Pl+S&zipcode=98198&country=US&latitude=47.3718&longitude=-122.3147&geocode=STREET