Acer saccharinum trees are supposed to be not very common in Vancouver, but there seem to be several old examples of them in the West End, unless I've got this wrong. These have the deeply lobed leaves and silvery lower surfaces. There are no samaras now in the trees or paired on the ground, but the single dried out ones on the ground are about the right relative size according to Straley's diagrams in Trees of Vancouver. These trees have nice big limbs. These trees are on Comox east of Denman. This tree is on Bidwell, north of Nelson (about two blocks from the others).