Unknown tree

Unknown tree

Observation - Unknown tree. Description: Can anyone identify this tree? I don’t think it’s native to the UK. It’s in Cintra Park in Reading. The park was owned by Sutton Seeds until about 50 years ago, and they planted numerous exotic trees around the borders. The leaves are oval with toothe

Can anyone identify this tree? I don’t think it’s native to the UK. It’s in Cintra Park in Reading. The park was owned by Sutton Seeds until about 50 years ago, and they planted numerous exotic trees around the borders. The leaves are oval with toothed margins and drip tips. Several leaves are borne together at the end of a long petiole. It produces clusters of round, green seeds in spring. The tree is about 15m tall, and I estimate is 75+ years old