BTU International, Esquire Rd., Billerica

BTU is on Route 3 between Routes 128 and 495. From Route 3 (either direction), take exit 28 (Treble Cove Rd). Turn right at the end of the ramp onto Treble Cove, and right again (0.1 to 0.4 miles) onto Republic Rd. Take another right (0.25 miles) onto Esquire Rd. BTU is the white building on the right just after the bend in the road (0.2 miles). Park in any unmarked space. Use the employees entrance (the glass door) at the far end of the parking lot.