I am located in Southern California and need help identifying tree. Please help, I have looked at multiple sources with no luck.
Agreed. Most likely it is Schefflera actinophylla; some chance it is S. calyptrata (aka Tupidanthus calyptratus).
Shape of leaflets and small umbel with fruits leads me to suggest Schefflera elliptica
I know have learned that S. calyptratus is considered to be S. pueckleri (what a name!), and I see that the fruiting bodies are a match. This is still found labeled Tupidanthus almost everywhere.