Here's one for your @Northern Light. This tree is on a neighbouring property that is unoccupied (never finished/occupied for over 25 years - the pride of the neighbourhood).
Best I can figure, it is some kind of clone of a Norway Maple and a Crimson King Norway Maple variant. There are two main trunks, one for each 'colour'; the green side is larger and represents about 2/3 of the foliage.
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Weird, are you sure they are one tree?
I've never seen anything quite like that.
As opposed to two that shared a pot and were planted touching one another?
That can happen.
Otherwise, I assume this was a grafting attempt............and a rather peculiar one.
If you don't mind, I'll send the photo along to someone.