Buying with cash and then placing a "Line of Credit" (LOC) on the property - this might not be a bad idea but let's cover a few things; the concept of a Line of Credit is that I use that LOC and then pay it back.  

A lot of the hard lines and accepted practices of the past are being called into question, not just with housing but all the things that flow from housing such as community-level education and policing.The current political thinking is to question the concept of Single Family Residential zoning as a social good.

They may recommend something simpler like a partnership agreement without using an LLC.

The proof of concept to myself.

As was mentioned, that "Core 4" can go a long ways and make your job as an investor much simpler.

The STR experience has a lot of run and as many home owners are investing in buying STR or some becoming Arbitrager, i see communities becoming more receptive to the concept, but it is not without political fight at the ballot box. 

Folks on the coasts can't believe such deals exist, but the fact that I have many of them proves the concept. 

I know people "throw out" the concept of putting in for a zoning change. 

If you title agent is good, they will look at water/sewer and this may appear on your side of the settlement statement as a reduction from proceeds...same concept with property tax...but that's another discussion...

Infinite banking has always been a very intriguing concept to me, way to put it in action!