"The younger trees and especially sprouts and trees in full sun tend to have a high proportion of deeply lobed leaves. Fully mature trees, especially under canopy where growth is slow, tend to have more (rarely all) unlobed leaves."
Yes.. agreed with the White Mulberry identification. I just wanted to say that I have a White Mulberry myself that came from a pack of mixed tree seed a few years back. Its leaves are identical to the one above, so pretty. It fruits, but the white fruits are a bit sickly (sweet but not much flavour).