Parker Styles gives a very important warning that all new investors should be savvy to.

Give a written warning to stop usage in the garage and tell them within the letter where the use would be permitted (if necessary).

Good points all around, and I have to say, I would heed Rhett's warning. 

Sure I can export my chart of accounts, and import them into a new system, but likely that’s a more than a few hours process to get it all setup correctly, particularly when it wasn’t my fault, I had no warning it was happening, and thus couldn’t do anything to stop it.TIP:Too many declined transactions will revoke your merchant services account.

If this same conduct or conduct of a similar nature is repeated within 12 months, your tenancy is subject to termination without further warning and without your being given an opportunity to cure the noncompliance.

Now, this is by no means a doom and gloom warning and these are just projections, but I think it is important for investors to take some time to stress test their portfolios with that scenario.  

But be warned, they are very, very small.  

Neil Stern Hey, couple questions. 1) what do you mean "finance a 600-700k renovation?

But be warned, more advantages will come up than disadvantages!

None of the warnings that Bob and Jay give are incorrect.