OCHSA Black Box Theater 1010 North Main Street Santa Ana, CA From South Orange County: 5 Frwy North Exit 17th Street--Turn left Turn left on Main Street Turn right on Washington St. Turn left on Sycamore St. Free parking available on the OCHSA Campus. The Black Box Theater entrance is on Main Street. From North Orange County: 5 Frwy South Exit Main Street South--turn right Turn right on Washington St. Turn left on Sycamore St. Free parking available on the OCHSA Campus. The Black Box Theater entrance is on Main Street. Note: 10th Street is closed between Main and Sycamore.