I noticed this fruit-bearing tree next to my parking spot in the Chinatown/Old Town section of downtown Portland. The fruit looks somewhat like a lychee, but the pattern on its skin doesn't look like a traditional lychee. It almost looks like a cross between a lychee and a small noni fruit.
I didn't take a photo of the tree, but it comes up on Google Streetview. It looks like it is part of a street improvement project near Chinatown, and I wonder if it is East Asian in origin to fit in with that theme.