mysterious neighborhood fruit tree

On a bike ride today I found this loquat tree (identified after-the-fact via wikipedia) near the public library. There's a big park there with soccer fields and some gardens. I saw that this tree had attracted a lot of interest from a hispanic family, so I wandered over. They were picking the fruit and eating it, and offered me one of them. It was good: sweet and a bit tart.

EDIT: Now I am noticing these trees all over town!