I rent a pole barn from this old guy I know since my garage at my cabin is small and I enjoy working on projects. All I rented was a 30x40 non insulated barn with a stove pipe installed in roof that was empty and he plows up to it in the winter. I added my own wood stove, my own tools and tool boxes and added a electric door opener for conveince all things that will be going with me when I leave. Only way I would rent out a barn I own is the same way you rent any space or house, its cleaned up when they leave to get deposit back and its only their shit and tools in their space and they cant get to your side and borrow stuff exactly how mine is set up except I have the whole barn not part of it.
with that said I cant wait to get my own INSULATED barn at my own house very soon. Renting sucks.