Answer: The site you describe might be a bit cramped for an ornamental pear tree. Pyrus betulifolia has a pyramidal shape and will grow 15'-30' tall with arching branches. It's the smallest of the ornamental pears. You might be happier with one of the so-called patio trees. These are generally well behaved, small in stature, and without invasive roots. Many provide autumn leaf color or spring bloom. Some suggestions include Acer circinatum (vine maple), Chionanthus (fringe tree), Crepe Myrtle or one of the smaller hawthorns. You might even consider training a camellia or holly into a tree form.
Hope one of these suggestions fits the spot!
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