As e-commerce booms and they grab a larger share of the market sales, more and more larger malls will being converted into distribution centers and self storage facilities.

What type of Storage is available for my residents? 

I do not want to rent a storage unit as I have lost enough money on this person.

There are more well qualified tenants and I have never felt compelled to remove the furnace and place it in storage when I had a tenant move out of one of my suburban homes.

You need to review your lease and see what it says as to outdoor storage... because if it isn't in the lease, and it isn't against code... there may not be a lot  you can legally do about it.  

We tore out the old kitchen, installed Lifeproof LVP throughout, replaced all the cabinets with Choice Cabinets (which we are distributors for so we get good prices), added an island, Calacatta Glacier Quartz countertops, new vanities, new fixtures, reframed a wall for the storage shed which had termite damage, chemically treated the house for termites, painted, and replaced all interior doors.

It sounds to me that you rented her "storage space" with no intention of allowing her to live there.

Whether it is the same as this time or storage for workers extra rigs or the like while there are there.

I am open to either of the 3 messages I alluded to above, as well as storage units and the like. 

Generally, with multifamily, it is 1%-2%, but a self-storage development - I have seen as high as 20%, but 5% is usually typical from my experience.