But for me, the benefits of a portfolio loan outlined above outweigh the benefits of 1 loan per property. 

When I look at only the choices you have already outlined, the winner by far is Utah.

@BillG - We do have language in the lease restricting business use on the property it's outlined here in bold: 6.USE AND OCCUPANCY:Lessee shall use the premises in such a manner as to comply with all local, county, state and federal laws, rules, ordinances, regulations and codes.Lessee shall not use the premises or permit it to be used for any disorderly or unlawful purpose or in any manner determined by Lessor to be offensive to any of the neighbors.The premises are to be used exclusively as a residence only by the persons named above and their immediate family.

If they do not perform these tests themselves, they will undoubtedly have a list of service providers they recommend.That said, if you follow the steps Jon outlines above, you should be able to narrow down the location of any leak.    

STNL I can let someone do the heavy lifting creating the big stuff and once accomplished develop the outlining areas.

What did your outline look like for a show?

Can you outline the pricing differences ?

Perhaps you should outline an example or the scenario you are looking into.

Will you go to the store and a guy with a price gun will be standing there before you get in the check out line?

I just want to create an outline JUST in case an investor or lender asks for one.