In areas with appreciating property values, a cash-out refinance can be used to extract equity tax-free, providing funds for the down payment on additional properties.
"The other thing that you can keep in mind, again, take this with a grain of salt, is that if you're buying properties in good areas and property values are going up, well, then you can also do a cash out refinance to pull some of that equity out tax-free and use that money to buy another property."