From Interstate 5 :

Take Highway 54 East. Take the Highland Avenue exit and make a left (north), at the stoplight. Proceed north until you have passed the second stoplight, and take an immediate left into the Acropolis Space Center Complex. MSI islocated in Suite 300 (the first building you arrive at).
 

From Interstate 805:

Take Highway 54 West and exit Highland Avenue, make a right on Highland (north) and take an immediate left into the Acropolis Space Center Complex. MSI is located in Suite 300 (the first building you arrive at).

3200 Highland Avenue Suite 300

National City, CA 91950