I once found an empty grain storage building 50' x300' with concrete floor about a mile from my house. It hadn't been used in years and needed repairs to the tall 16' doors and massive amount of accumulated dirt and dust. No electricity, but my son lent me his welder with a generator.
Building was owned by a chemical manufacturing company located 30 miles away.
I got a lease for $100 a month and was allowed to store 5 motor homes if I wanted to.
I was to keep the entrance cleared and kept the weeds down.
I had negotiated with the president of the company (son of owner) on the contract. After a visit from the owner, I was to reduce my footprint according to the owner. That didn't last long as within a year they wanted me out so they could use the building for equipment storage. I was told in so many words they were afraid that I would leave my junk behind. I did peek one day and saw they were storing an old fire engine and fifth wheel trailer in the building.
As a side note I trapped about a hundred mice and had a skunk family reside in the building for little while.
I was than able to get free indoor storage at an oil well business just 1/4 mile away. Only condition was I couldn't block access to the door for their front loader to get in and out.
When the granddaughter of the owner came on a Suprise visit and saw my motor homes, she had a fit and I lost that storage. I ended up storing one motorhome in a lot within 1 mile of house and was able to store the other motorhome 15 miles away at a friend's business until I could get it sold.
The units weren't ideal, but they were better than nothing.
You might be able to negotiate with a farmer or business about storage and working conditions.
