From the North:

Take I-93 South.  Merge onto Route 3 South.  Take Exit 16A (Rt 18 N/Main St exit) toward Weymouth.  Take quick right onto Winter Street.  Follow all the way down to the end; at stop sign, take a left onto Middle Street.  Take the first right (at set of lights) onto Washington Street.  884 Washington Street is on the left, a brick building.  Parking lot entrance is directly after building.

From the South:

Take Route 3 North.  Take Exit 14 (Rt 228-N) towards Hingham/Nantasket.  Route 228-N then becomes Pond Street/228.  Turn left onto Whiting Street/Rt-53.  Continue on Route 53, which is Washington Street in Weymouth.  884 Washington Street is on the right.  Entrance to the parking lot is directly prior to passing building.