From the 134 (east or west), exit Linda Vista Avenue/Colorado Blvd. Go South to Colorado Blvd and turn left. Bear right at Linda Vista Ave. Take Linda Vista past the Rose Bowl (on right) to the second traffic light. Turn left at Lida Street. Continue up the hill. The entrance to the Art Center is on the left. Follow the signs to the upper lot. The Auditorium is at the north end of the building.
A campus/building map is availabe at http://www.artcenter.edu/accd/files/Hillside_Campus_Map.pdf
Detailed directions from various city locates are available at http://www.artcenter.edu/accd/campus/visit/directions.jsp
There is no charge for parking, but carpooling is always good. Once you enter the school grounds, follow the signs to the upper lot. The Ahmanson Auditorium is in the north end of the building.