Answer: Ficus benjamina isn't a very good choice for the site you describe. The roots are invasive and the tree can attain heights of 60'. If you have your heart set on a ficus, you can contain both the roots and the height of the tree by planting in a large (10-gallon) pot and sinking the pot into the ground. Ficus can be pruned without harm, providing you prune regularly to control the size rather than waiting until it's too tall and then topping or pruning radically. Hope this provides some insight and helps you decide whether or not you want a ficus next to your house.
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