Edit: In the absence of any better theories, I’m calling this a Norway maple. The broadness of the leaf, the number of lobes, and the shallowness of the sinuses fit; so do the yellow fall foliage, the rounded buds, and the reddish brown twigs. And finally if I remember correctly, the samaras (helicopters) have that 180-degree arrangement that Norway maple has. A story: when I googled “Norway maple bud” I finally saw a picture of the buds that I thought fit my theory, but it turned out to be the picture I just posted. Cruel fate.