We've been coming to the Luther Burbank Center to attend concerts and performances for years before we took time to visit the public art here.
This one should be easy, especially if there's not an event going on that saps all of the parking. It's in a black magnetic hide-a-key container that is only suitable for the smallest cache items. There was originally a pencil in the cache, but be safe and bring your own.
Take a bit of time to explore the grounds and see what's happening on their website.