Building a multifamily property vs. buying one already established

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My friend and I are both interested in real estate, however, he suddenly come to me "explaining" why I should build a multifamily property from scratch rather than buying one. Honestly, I think it's not a smart idea and it won't make me change my mind from the plan I already have, I would still like to know: Is building a multifamily property from scratch a better investment than buying one that is already established? I am only asking to educate myself.