Proof of funds would be a bank statement or some other document indicating the liquidity you have.

They switch banks and ask for an extension and add another $2500 deposit as a show of good faith. 

Aunt/Uncle have a property maintenance company in Brainerd that partners with my PM, Cousin works for the local commercial bank, things like that... 

Robbing a bank to pay rent is a CRIME.

@Brice Alef-Torrisi putting each property in its own LLC is usually overkill.Getting a bank account for each LLC is typically something you need to do to avoid "piercing of the LLC corporate veil" (actually depends on tax selection you made for LLC), but is also overkill.You haven't indicated how you are holding the deed for the latest property.If in your name or same LLC, you don't need a separate bank account.If in separate LLC, you can create a Master LLC, have each property LLC hire the Master LLC to manage their affairs, and just get a bank account for Master LLC.This is an opinion, not advice, so lookup CPA Frank Alcini in Troy for expert advice.

Head over to bank rate or and take a look at the mortgage calculators, plug in the numbers and get an idea of what the property needs to generate to satisfy the intended debt.You still have to underwrite the deal for the non-finance expenses as well(typically 40-50% of the gross rents). 

I do have reserves to cover contingencies.Let's just say, I'm satisfied with those numbers.Had I had to use a bank, I would have had to put down 20% for $33,000, plus closing and my payment on the remaining would be $1400 PITI including HOA. 

At this point, I would recommend having a line of credit to cover these things so you don't have money sitting in the bank doing nothing when it could be put to work.I have 33 units, no debt except for mortgages, and excellent income.

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For bookkeeping purposes, I recommend designating a separate bank account exclusive to the house hack activities to keep some sanity.