From Oakland Airport:

1. Take Interstate 880 South (towards San Jose)

2. Drive approximately 15 minutes to the Highway 92 junction.  Take Highway 92 West (towards the San Mateo Bridge).

3. Exit Highway 92 at Clawiter Ave.

4. After exiting, turn right on to Clawiter Ave. at the stop light . 

5. Turn left on Diablo Ave (you will see the sign "Diablo Industrial Park")

6. You will find Four Dimensions a couple of buildings down on your left hand side. Look for the sign Four Dimensions.