I always viewed it as "who cares how much money I put down", I plan to pay them all of before I retire as part of my ultimate strategy anyways. 

Meet with a local banker & schedule a time to talk with a mortgage broker, they'll give you at least a baseline of what kind of down payment options and rates are out there.After that, if you're still wanting to research more creative options, do some looking into seller financing (a very hot topic with good, and bad, advice out there), look into private lenders, and commercial financing options.If you're wanting to live in 1/4 of your quadplex, then conventional residential loans may in fact be your best option as you can purchase that with a fannie/freddy loan with very low down, and use up to 75% of the income from the property toward your own income. 

That would be for the deed, so use care not to trigger the acceleration clause with your lender.

Rental arbitrage can be a great way to start with Airbnb if approached carefully.

Research market rents, carefully calculate expenses, and ensure you have a solid lease agreement.

If the tenants don't care for the pool properly, it could cost you thousands to fix.

Conventional loan How did you add value to the deal?

Timing your next investment is all about balancing risk and financial comfort—trust your instincts and run the numbers carefully.

Be careful not to violate any Fair Housing laws during this process.

You have to be a serious individual that takes care business.