From the South:

1. Take Route 128 North to Route 3A North - Burlington.
2. Proceed approximately 5 miles through Burlington and into Billerica.
3. Take a right on to Cook Street (there's a traffic light and a white clapboard Church on the right at the corner).
4. Proceed past Shawsheen Regional Technical School and bear left onto Alexander Road.
   
   IRP is the first building on the right: 5 Alexander Road.

From Logan Airport (Boston):

1. Leaving the Airport, follow signs to Route 93 North via the Callahan Tunnel.
2. Take Route 93 North to Route 128 / 95 South.
3. Follow Route 128 / 95 about 5 miles to Route 3A North - Burlington.
4. Proceed approximately 5 miles through Burlington and into Billerica.
5. Take a right on to Cook Street (there's a traffic light and a white clapboard Church on the right at the corner).
6. Proceed past Shawsheen Regional Technical School and bear left onto Alexander Road.
   
   IRP is the first building on the right: 5 Alexander Road.