Contact Us First Name*Last Name*Email*Click to view help for this field.We will send you an acknowledgment email.Your Message * Parking Parking is available both on Walnut Street (for shorter visits) and in the side and lower lots of 101 Walnut Street (for longer visits/courses). Please note that our brick building is home to both Primary Source and Vanasse Hangen Brustlin, Inc. (VHB). From Walnut Street, take the driveway marked “101 Walnut Street.” Do not park in the first parking lot on your left as it belongs to 125 Walnut Street and is not available to Primary Source. Proceed down the hill to enter the VHB parking lot that runs along the side and back of our building. Park anywhere in this lot and walk back to Walnut Street to enter Primary Source (do not enter through VHB). Directions From West via Mass Pike Take the Mass Pike past I-95/128 tolls. Exit at the Newton Watertown exit (exit 17). Follow signs to Watertown and curve left across Pike. At lights be on the right hand side. Proceed straight down Galen Street to Watertown Square. Continue straight through Watertown Square. Galen Street becomes Mt. Auburn Street. Walnut Street is on the right about 1/2 mile from Watertown Square. Turn right on Walnut Street. Primary Source is in a low brick building with its entry facing Walnut Street. From South or North Get onto I-95/128. Exit onto Mass Pike east (towards Boston). Exit at Newton/Watertown exit (exit 17). Follow signs to Watertown and curve left across Pike. At lights be on the right hand side. Proceed straight down Galen Street to Watertown Square. Continue straight through Watertown Square. Galen Street becomes Mt. Auburn Street. Walnut Street is on the right about 1/2 mile from Watertown Square. Turn right on Walnut Street. Primary Source is in a low brick building with its entry facing Walnut Street. From the Boston area/Harvard Square Take Brattle or Mt. Auburn St. west. Cross Fresh Pond Parkway and continue west with cemetery on left-hand side. After passing Star Market on right, take left fork at lights and continue along Mt. Auburn St. (Rt. 16) for approximately 1.5 miles. Pass by large school on left and turn left at next light onto Walnut Street. Primary Source is in a low brick building with its entry facing Walnut Street. From Public Transportation Take MBTA Bus 71 from Harvard or Watertown Square. Exit at Walnut Street (stop is called “Bates Road East”). Cross Mt. Auburn and walk down Walnut Street. Primary Source is in a low brick building with its entry facing Walnut Street.