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Koelreuteria paniculata
I work at a large university that has been planting trees from all over the world for 150 years, so I have a sort of "living field guide" that I can consult.
That's a Golden Rain Tree. Interestingly enough, the USDA PLANTS database doesn't show it as occurring in CA.
Seed pods from blooms on the tree, but I don't know the name of the tree