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From Mass Pike/Newton Corner:

Follow Centre Street from Newton Corner. Centre Street becomes Galen Street in Watertown. Just before Watertown Square, Galen Street becomes Route 16.
Stay in right lanes - left lanes turn left at Watertown Square; right lanes go straight or turn right.

Stay straight through Watertown Square - Galen Street becomes Mt. Auburn Street.

You will pass a small plaza and a Starbucks Coffee and come to a stop light. The second left after the stop light is Marshall Street. 

Turn left onto Marshall Street - parking for 30 Common Street administration building is clearly marked on the right side.

Updated February, 2008