Fair enough, and I agree that the Office Tower in particular is a serious letdown without aboveground Z-levels. If nothing else, we need to be able to move furniture around.
A $VEHICLE Dealership would probably have intact & good-condition vehicles: fuel and drive, which given the current sorry state of 100% of the vehicles found lying around in the current versions, would be a serious boon. Motorcycle dealers in particular would likely stock leathers & Helmets.
Furniture stores cold be greatly improved by allowing players to push or attach furniture to vehicles. At minimum, one ought to be able to take the armchair apart and rebuild back at base–apparently IKEA went out of business* pre-Cata. 
*He said, sitting in his POANG with ottoman. Flat-pack easy-assemble furnishings FTW.
(And office chairs IRL tend to be on wheels, no?)