Going either north or south on route 128 (I95)

Bear right off Rte 128 (I95) at Exit 20A to enter Rte 9 East (If you are arriving from the south keep to the right when taking Exit 20A as there is no need to get onto Rte 9). Continue for a short distance and exit right off Rte 9 East at the Chestnut Street Exit. Take the first left onto Ellis St. and go through the Underpass. Take next left. (You have made a U-turn under Rte 9) Continue straight ahead for one tenth of a mile and turn right onto William Street to enter the Wellesley Office Park. William Street Building 55 will be the second right. 

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Going either east or west on The Mass. Turnpike (I90)

Take the Exit for 128 (I95) South.

Bear right off Rte 128 (I95) at Exit 20A to enter Rte 9 East. Continue for a short distance and exit right off Rte 9 East at the Chestnut Street Exit. Take the first left onto Ellis St. and go through the Underpass. Take next left. (You have made a U-turn under Rte 9) Continue straight ahead for one tenth of a mile and turn right onto William Street to enter the Wellesley Office Park. William Street Building 55 will be the second right. 

Click here for a larger map and MapQuest directions