You’re too zoomed out. Technically, because humans are natural, our skyscrapers are as natural as the structures other animals build. No one uses the word in that manner, however.
Yes, everything is made of natural materials because everything in the universe is natural. Synthetic, in common parlance, usually means something that was created or synthesized by humans using some kind of chemical processing. While everything involved in creating it is “natural,” and the resulting product is “natural,” words have certain common usages and most would not use the word natural to describe a synthetic product.
Your question seems to be more a question of semantics.
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