Not 100% certain, but I would guess it has to do with the pool of contractors that developers use when employing different building techniques.
At least in strong union markets (US midwest / northeast), it’s more likely that steel and concrete workers will be unionized / highly skilled / highly paid as compared to carpenters doing residential type wood framing.
If a developer wants to cheap out on construction of light commercial buildings, one way is to use wood framing. The wood framing is cheaper because of materials, but also because it’s easy to find non-union / low skill / low paid framing crews to do the framing.
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