Found an interesting tree fruit in Santa Cruz today on a couple trees with and without foliage. (Near Wilder Ranch State Park along the bluffs on the ocean)
The green colored fruit has three 'panels'. (The most unique aspect to me) It contains a large whitish hollow seed/nut and some smaller seeds. It weeps a clear sticky liquid from the stem and when opened the liquid froths a bit.
Tree leaf is single lobed, simple. Bark was grey and smooth if I remember correctly.