From North:
Take 93 South to Exit 28 (Sullivan Sq/Charlestown). Bear left to Sullivan Sq at the split, then slide to ther right as you see the Sullivan Sq T Station on your right.
Take a right at the 1st light onto Cambridge St (keeping Sullivan Sq Station on your right). Continue straight on Cambridge Street for about 1.5 miles into Union Sq.
(You'll pass a Dunkin Donuts and a Hess gas station on your right and a Holiday Inn on your left, go under both a railroad bridge and the MaGrath Highway underpass then see the Somerville Police Station on your left. Also note that somewhere along your journey Cambridge Street will magically turn into Washington Street.)
When you enter Union Sq., Washington (nee Cambridge) St. will turn 90 degrees to the left, then 90 degrees to the right (yet another Dunkin Donuts!), then run into a multi-road intersection in the center of Union Square.
At that intersection, take a left at he light onto Webster Street (Saint Joseph's Church will be on your right as you turn onto Webster St). Go straight on Webster over the railroad tracks (some people call it a hill), through the light (U-SAVE Auto rental should be on your right).
Then take the first left onto Columbia Street (Royal White Laundry on left). Continue straight, bearing left/straight at the fork, then directly ahead of you is the entrance to our parking lot and Boynton Yards Technology Park.
BUT WATCH OUT for traffic coming from the right -- they have the right of way!