Well there are alot of things give me the weekend and i am sure i could come up with some. But the pack and ship thing is good as well as having postal boxes to rent out.
I wouldn't do the liquior store as it might bring in the wrong type of ppl into your storage units, if ya know what i mean. As for the beauty shop what happens if they are in the middle of a perm and in walks someone to rent a unit. The smell would be horrible. These are just my 2 cents on this take it or leave it.
How big is your office space?

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Proud Karate Mom