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Here's a map.
3-270 is on the second floor of building 3, and is in the end closest to the river.
From 77 Massachusetts Avenue (the main entrance), walk into Lobby 7 and enter the Infinite Corridor (the long corridor opposite the entrance to the lobby). At the first intersection, the corridor on your right is Building 3. Turn south (right, toward the river). At the south end of the building, take the large stairway up to the second floor. 3-270 will be on your left.
If you have any other questions or suggestions for improving these directions, e-mail us!
