From Oakland - take 24 East through the Caldecott Tunnel and continue past Orinda. 2 Exits past Orinda is Acalanes which you take and stay right down the ramp to the stop light. This takes you onto Mt. Diablo Blvd. Stay in the left hand lane and continue into Lafayette. The first stoplight is Risa Rd, and on your lefthand side is the Veterans Memorial Building, then its parking lot, a driveway, and a building under construction. At the end of the parking lot, turn left into the driveway with the sign 3700-3746.. Proceed up the hill to the right and you will see ahead of you on the right a sign that looks like a white oak tree, and 3702 is on the bottom right branch. Go straight and this takes you into the parking lot for 3702, which is the first building on your right.
Take 24 west to the Central Lafayette exit and turn left at the bottom of the ramp onto Deer Hill Rd. This will take you along in front of the Lafayette BART station and deadends. At the deadend, turn left onto Happy Valley Rd, and at the stoplight, turn right onto Mt. Diablo Blvd. Go about half a mile and you will see the building under construction on your right. Immediately at the far end of that building, there is a driveway heading up the hill which you take. Follow the directions above from there.