They charge 10% gross collected rent , and take 50% first months rent when they sign a lease. 

That said, if you are looking to sell the business that has value, then I would hire a business broker for that portion, sell the business and write a new lease for the property that could be used for an investor looking for NOI.

Perhaps see if your landlord would be willing to do a lease-option with you (assuming he'll sell at a reasonable price).If the owner is an investor, ask him to lunch and talk to him/her about how they got to where they are. 

If they are looking to "park" money in US, you can buy NNN lease - nothing for you to manage and they will even get a small return (5-7% roughly) but don't quote me on that number. 

I sell, buy & lease for myself and others as a investor/broker.  

@John Moran,There are number of active investors as well as service providers who are frequent contributors on this forum.

Might I mention, I am not on a lease at this point either. 

Read the lease does it say deposit Or fee.

The one with a two year lease has a trashed yard and says she can not afford her storage unit.

It's my experience that when you have problems before the lease begins, you'll have problems for the duration.I'd give her the deposit back and find another resident.