The ones I've seen were about 1500-3000 SF, nicely done, secured facilities, and not for residential use; more like "toy overflow".
Prices around here when I looked were about the same as buying a small/modest home with enough land to either already have or build a pole barn or metal bldg.
But property here at the time was relatively inexpensive, and I like the privacy and my trees.
Outside of being "plug & play" I didn't see the advantage over having my own private home & shop building; plus, its value has doubled. Rent doesn't do that.
However, some years back I knew guys who leased/rented units in industrial parks & lived there; another buddy rented one at the track, and lived there for a couple years before getting caught at it.
Nobody really cared at the industrial parks, but either a motorhome inside or some construction is necessary.