However,  we also know and have experienced the great the benefits of having that corporate income, paystubs and W-2s to help us get financing from larger institutions to fund these acquisitions.  

I spent several years working for institutional investors, and for the most part they're looking at total returns over cash flow. 

Generally, the institutional lender expects to be in a 1st lien position so it's mtg would be recorded first. 

What confuses people is that some lending institutions make what are actually personal loans, qualified by individuals credit score and personal income, and disguise them as “business loans”.  

As a licensed agent you can bring institutional investor cash offers to sellers - and even market this way.

I don't think turnkey is for me, and apartment complexes that cash flow seem to be hard to find after institutional investors gobble up the decent deals.I'm considering relocating to Las Vegas/Nevada area, buying either multiple four plexes for 350-400K, or multiple single family homes via 1031 exchange then paying off the debt after the deals.

However, since the Deed is still in the seller’s possession this is typically a non-issue for most financial institutions and their acceleration clause will not apply.

As I continue to buy properties, what will keep me in favor with lending institutions as my debt grows?  

Personally, I adopt the Realtor's Code of Ethics as that applies to real estate operations, I also adopt the Code of Ethics of lending institutions such as confidentiality, disclosures, fair dealing and much of that is also anchored in law. 

- "What loans does your lending institution prefer?"