(They didn't make it easy for you to find us but we'll help with landmarks and it's worth the trip.)
Take the Red Line to the Charles/MGH stop. Cross over the Longfellow Bridge. We are located in the first building on the right which is the Riverfront Office Park at One Main Street. The suite number is 105. We're behind one of the brown paneled 'secret doors' that you'll find in the lobby. Go through the door and all the way down the hall turning left.
Take the Red Line to Kendall Station. Head east on Main Street towards the Longfellow Bridge. We are located in the last building on the left before the Longfellow Bridge which is the Riverfront Office Park at One Main Street. Our suite number is 105.