He still has the storage capacity he had with his old tank but the efficiency of modern systems.

If the investment is in California, I recommend you contact an attorney immediately because the laws are very difficult to navigate and you are in a very litigious state.In my state, property is considered abandoned after a certain number of days and then I can dispose of it or place it in storage.

Main issue would be if we needed different type of insurance, loan issues if renting out short term, storage of our things while renting etc.  

For example: I have a 64 unit self storage place that I know would seller finance.

If I put in a larger size shed (10'x10') could I fence off half of it inside to dedicate to storage space for the tenants to rent out and get additional rents on?

But it will cover battery-storage technology (up to a certain capacity).

There are specific "abandonment" rules that landlords have to follow when a tenant abandons their unit and leaves belongings behind like keeping their stuff for a certain period of time, then putting in storage, etc...Always better safe than sorry.

Making tenants feel safe (motion detector lights, fire ext in unit, peep holes in door, smoke detectors with battery back up in all BR's and hallway, renovated baths, extra storage and off street parking all help tenants feel cared for, safe and secure.)

Tesla will use the space, which is about 35 miles south of the company's billion-dollar gigafactory, for warehouse storage and light assembly, he said.https://www.bizjournals.com/austin/news/2023/08/22/tesla-kyl...

I did a series of BP videos on 7 paths to succeed in commercial real estate (and focused some videos on self-storage).