Answer: Instead of a tree or a shrub, how about an evergreen vine such as Sweet Autumn Clematis? You can train it up on wires strung from the roof and prune it back so you can still see in and out but it will provide a little privacy. Or you can plant some dwarf conifers. They won't get very tall but their root systems will remain small enough that they won't threaten the foundation of your house.
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