Not gonna dig this one. Turns out its Acer Negundo. Here's what wikipedia says....
"It is a small, usually fast-growing and fairly short-lived
tree that grows up to 10-25 m tall, with a trunk diameter of 30-50 cm, rarely up to 1 m diameter. It often has several trunks and can form impenetrable thickets.
The shoots are green, often with a whitish to pink or violet
waxy coating when young. Branches are smooth, somewhat brittle, and tend to
retain a fresh green colour rather than forming a bark of dead, protective tissue. The bark on its trunks is pale gray or light brown, deeply cleft into broad ridges, and scaly.
Unlike most other maples, it has
pinnate leaves that have three to seven leaflets (usually three). Although some other maples (such as
A. griseum, Acer mandshuricum and the closely-related
A. cissifolium) have trifoliate leaves, only
A. negundo regularly displays more than three leaflets.
The leaflets are about 5-10 cm long and 3-7 cm wide with slightly serrate margins. Leafs have a
translucent light green colour and turn yellow in fall."
Not something I want to mess with.