The 30x60 with 10ft ceilings I built with my father about a year ago in various states of car infestation:
240 parts storage:
Has an oven for powder coating, fridge, full stereo all around up in the ceiling, and 220 for welders. All it needs is AC and a car lift....and less shit in it. It's currently got 1 zero turn mower, a 1977 vw bus, 1 17ft fish and ski, 1 3 person sea doo, and an insane amount of random junk. But my dad let's me fill it with my stuff too, so I can't complain.