Don't stop asking until you find the right person for your situation.

I joke I used to be a normal person who could hold conversations about small talk like who won the Oscars or the latest in sports. 

I personally have used Chase business checking and their credit cards that offer 15-18 months 0 APR.

I'm gonna play a small hand and see if I can get a counter offer accepted for the 2 empty lots next to my personal home.

The IRA funds would not be able to be combined with other personal funds as in your note above. 

Personally I’m having a hard time coming up with Cons, and that the Pros greatly outweigh them.

I got the current owners (person who is selling me the property) blessing to post the house for rent right now with a move in date of August 1st if I wanted to. 

Would love to hear some thoughts on how to handle the situation.

In all honesty, unless you or someone on your team has extensive knowledge and experience in credit, mortgage finance, secondary markets, and portfolio management, your company is probably better served by building a deep and meaningful partnership with a small local lender to handle this for you - or maybe even buy such a lender with infrastructure in place as a turnkey solution.

Rent the other side of the duplex to a person you then employ as a full-time (or part-time) nanny.