Ashdown House (MIT building NW35) is located at 235 Albany Street, Cambridge, MA 02139. (See map on whereis.mit.edu or Google)
To walk or drive to Ashdown House from the center of the MIT Campus (77 Massachusetts Ave.), go north, away from Charles River, two blocks along Massachusetts Ave. Turn left at Albany St. and go two blocks to the corner of Pacific St. The entrance to Ashdown House is at the corner of Albany and Pacific.
The closest MBTA stations are Central Square and Kendall, both on the Red Line. Ashdown House is about a 15-20 minute walk from either station. Bus service via MBTA buses #CT-1 and #1 ply up and down Massachusetts Avenue, connecting Central Square, MIT, the Harvard Bridge, the Boston Symphony, and Boston Medical Center; the #1 bus also goes north to Harvard Square. (Note: These buses also stop near the intersection of Albany St. and Massachusetts Ave from where you can easily walk west along Albany St. about 5 minutes to Ashdown House.
For evening and late-night transportation 7 days a week, SafeRide's Cambridge West and Cambridge East shuttles stop at the Warehouse (NW30) which is across the street from Ashdown House, every 30 minutes during the hours of operation, free of charge and open to all members of the MIT community. For daytime transit, MIT has an agreement with EZRide to allow free transit with an MIT ID. EZRide has a stop at Pacific and Albany, right in front of Ashdown.
Metered public parking is available along Albany St. and Pacific St.