Answer: Michelia champaca will grow 10-20 feet tall and wide. I think it will be much too large for the area you describe. While it's possible to keep Michelia smaller with pruning, you may be pruning off the flowering branches, which will defeat the purpose of having a flowering tree. Instead of planting a tree in the small space, why not choose a flowering shrub such as Escallonia or even Lilac? You'll be able to keep these plants within bounds without extensive pruning. Best wishes with your landscape!
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