Take the Rockport or Ipswich commuter rail leaving from North Station to Central Square, Lynn. (Frequent at peak times, irregular at off-peak times. Check the MBTA for schedules.) After disembarking from train in Lynn, descend stairs, turn left and walk out from station towards route 1A.

Turn right and cross Market street, and continue walking. You'll see Clock Tower Place across the street to the left. Cross the street at the light (and crosswalk) just in front of Clock Tower Place. PRIMUS is on the third floor on the left, suite 302.