EDIT:
Thanks everyone for the comments.
Regarding eating a fruit when I don't know what it is.... I just want to clarify that others in the apartment building had been eating them before us for years. It was known in the neighborhood that they were fine to eat.
Obviously, you don't want to eat a completely strange fruit when you don't know if it's edible or safe.
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We've been eating this fruit for a few years now, from a tree outside our apartment building. We have no idea what it is. I've checked Chat, but I didn't get a definitive answer. Anybody have any ideas what kind of tree this is?
The skin is thick and tough. The flesh is soft and sweet. It tastes kind of like a pineapple.
The location is the east side of San Francisco Bay, California.