If you are paying in cash, you'd have the bank write a letter indicating you have the capital on deposit or you can also print out your bank statement showing the funds.

I have a good job and properties are cash flowing.

@Mark C.You are going to create a tax and accounting nightmareYou will pay taxes in each state you own property (typically) aThus each LLC will need to file in that state then you roll up to you which just adds more expense to your tax returnsYou will end up spending thousands of dollars per year to get taxes done which will eat any cash flow from making it so complexKeep it simple

I am location agnostic but I'd like to start at some level of positive cash flow. 

Particularly buying properties to rent out for additional cash flow but also flipping properties.

Thirdly, there is no win-win when you have to shell out $20,000.00 up front, only animosity which will develop in time after you realize that you have been duped and are kicking yourself in the *** for taking the "bait" - too late now.

Then you will need to have a cash out refi to pay yourself back.

Infinite cash flow with minimal work was the goal.

That is a win and is usually way higher than the old landlord rent.Once you show them data and allow them to be a participant, you are working together.

You will almost surely be at negative cash flow house hacking in JC, depending on how much down.