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Lots of Variety!
Off-campus housing at BYU is awesome! There's a wide variety of expensive, really cheap, and moderately priced apartments, houses, etc. Some complexes are known as being super social, others not so much, so pretty much whatever social scene you're into, there's a complex for you! If you want to live within walking distance, there's apartments for you! And if you want to live farther away, there's tons of those, too!
In a word, off-campus housing is great and there's something for everyone!