From the 405 Freeway:

Take Sunset Blvd. West, go 6.6 miles, passing through the business district of Pacific Palisades
Turn right at the signal onto Bienveneda Avenue - go 0.3 miles
Travel up Bienveneda approximately 2 blocks, turn left into the 2nd driveway of the main parking lot (church bell tower)

From the 10 Freeway:

Take the 10 Freeway West toward Santa Monica
Continue on CA-1 North (PCH), go 3.2 miles
Turn right on Temescal Canyon, go 1.1 miles
Turn left onto Sunset Boulevard, go  0.6 miles
Turn right at the signal onto Bienveneda Avenue, go  0.3 miles
Travel up Bienveneda approximately 2 blocks, turn left into the 2nd driveway of the main parking lot (church bell tower)

Frost Administration Building - From the Main Parking Lot:

Walk up the steps (North-East of the parking lot) to the Meadow (playing field). Follow the path up the hill.  Continue walking pass the Preschool building and yard.  Cross the road and climb the stone steps up to the Administration Building.