From 580:

Take the Santa Rita Rd exit towards Pleasanton. Drive for approximately 2 miles. Make a left on Valley Ave. Then make a right on Stanley Blvd.

Finally make a left on California Ave/Reflections Dr. End at 26A California Ave. SAS will be on your left side.

From 680:

Take Sunol Blvd exit towards downtown Pleasanton. Stay on Sunol Blvd which turns into 1st St after about a mile. 1st will then change into Stanley Blvd following another mile. Make a right on California Ave/Reflections Dr. End at 26A California Ave. SAS will be on your left side.