From the North:

I-95 S/MA-128 S.
Take the RT-135 exit, exit number 17, towards NEEDHAM/NATICK.
Keep RIGHT at the fork in the ramp.
Merge onto MA-135.
Turn SLIGHT RIGHT onto MA-135/WEST ST.
Stay straight to go onto WEST ST.
WEST ST becomes COMMON ST.
Turn SLIGHT LEFT onto HIGH ST.

From the South:

I-95 N
Take the exit number 15A, towards DEDHAM(RT-1A).
Merge onto PROVIDENCE HWY.
PROVIDENCE HWY becomes BOSTON PROVIDENCE HWY.
BOSTON PROVIDENCE HWY becomes PROVIDENCE HWY.
Turn SLIGHT LEFT onto EASTERN AVE.
Turn LEFT onto HIGH ST.