@SarahMused
It looks more like some kind of chestnut to me. There are reddish leaved versions like the Chinese chestnut, aesculus chinensis.
I see where you're coming from, but if it were Aesculus chinensis, the raceme would be vertical not dangling, and isn't the bud too slim?
I don't think the colour reflects the final colour of the leaves. many plants have a different colour for their emerging leaves, eg Amelenchire, and, of course, sycamore (Acer pseudoplatanus)