I made sure my realtor added to our offer that we have the right to conduct an inspection and an oil tank sweep.It really does suck that banks can cancel at any time.

Likewise furnaces are going to give you about 30-40 years, hot water tanks about 15 & you want to get a home that's had the electrical updated to breaker panels.

I'm not sure of the legality surrounding storage rentals.

I've thought of buying a few airstreams to Airbnb, building a tiny home to rent out, storage units, or pouring a few slabs for RV/Mobile homes.

Think about it this way, if for some reason the area tanks, do you want a property that offers a 5% return or a 10%?

I’d look around the immediate neighborhood and check with commercial businesses to see if they could use additional storage.  

I also learned, from digging up several old septic tanks, that the ones filled with crap are what you want- the tanks without crap have likely leaked into the ground and need to be replaced.

This was the clause in the lease regarding termination:In case of any termination of this Lease or termination of the Resident’s right to occupy under this lease, byreason of default of Resident or non-payment by Resident, Resident will indemnify Landlord from and againstany loss and damage sustained by reason of any termination caused by the default of, or the breach by, Resident.Landlord’s damages shall include, but shall not be limited to, any loss of rents, accrued but unpaid prior totermination; all costs and expenses reasonably incurred by the Landlord to restore the Premises to the samecondition as they were at the beginning of the Lease, including cleaning and painting (reasonable wear and tearexcepted); any costs reasonably incurred to advertise and relocate a new Resident, including broker's fees;moving, storage charges, or any other expenses, fees, or costs allowed by law, incurred by Landlord in movingResident’s belongings pursuant to any legal proceedings and as allowed by the court.

A hot market could go higher if the market tanks not so much.

You can also truck in water and have a water tank in some areas.