I like to find owner finance deals and just finance the down payment for as many years as I can for cash flow.

Any laws against repaying the loan in stocks instead of actual cash?

Like most places with growth though, it's hard to find properties to cash flow given interest rates etc. 

Quote from @Erick Pena: A "good" rental property is one that covers all expenses (mortgage, taxes, insurance, maintenance, property management fees, and any other costs) and still leave a surplus (commonly referred to as cash flow).Calculate cash flow as: Cash Flow = Rental Income − Operating Expenses − DebtThere's much more to it, but that's the basic idea.

Holding properties in all cash early in an investment career is missing out of leverage returns.

I plan to utilize some cash, margin loan, 401k loan, and a HELOC as a down payment.My first house hack (now an out of state investment) has a Zestimate of $530K, and I have $266K left on the loan.

Temporary work travelers etc.

If you don't intend to do that right away then do the 20% and save the extra cash flow.

What you use is what you have to pay back.Cash-Out Refinance Cash-out refinance this gives you cash from the equity you have built up in your home.

There is almost no scenario where a condo would ever positive cash flow while servicing debt, and very little positive cash flow with no debt.If your budget only allows for a condo, find a better place to put your money to work.