The Hobby Shop is located in the basement of 120 Massachusetts Avenue, building W31, on the corner of Vassar Street. Enter through the handicap entrance on the corner or take the elevator down from the front entrance lobby to level B. Members have card swipe access through the inner door, visitors should call the shop from the phone in the hall. Turn right, go down steps and the shop is on the left. Visitors are welcome but please call or email in advance when possible. Phone: 617-253-4343. Email: Ken Stone.
Map of Building 31, which contains the MIT Hobbyshop, with arrows showing the two entrance locations:

The floorplan of the building's basement shown below has the Hobbyshop highlighted in yellow: