We have what looks like a tree growing in a shady area of the garden. I took k a picture of the leaves, it stands about 6ft tall but probably would be taller if we didn't cut it back. Location is South Ontario Canada. I think it had white flowers at some point, I haven't seen any this year.
Looks like a cutleaf cultivar of an elder Sambucus sp., perhaps most likely Sambucus canadensis 'Laciniata' in your area. Sambucus canadensis 'Laciniata' - Plant Finder