Once you feel comfortable, HELOC your free primary and use those funds to scale. 

You know @Aaron Watkins, it's like if you borrowed funds from your HELOC, Home Equity Loan, 0% Balance Transfer Credit Card, or any other source of "cheap" money, to lend it out, and keep the difference!

@Fernando GarciaAbsolutely, it’s called a Cash Out Refinance, just keep in mind bank will only give you 70 to 90% value of property and interest rates are slightly higher than conventional loans.Although rate might be higher it’s typically fix, another option you might want to consider are HELOCs..

Next steps - trying to do either a rate/term refi + HELOC or a cash out refi.

Here’s why: most helocs are callable.

Use a HELOC from the investment property to help with the DPThese are just a few options but I think you get the idea.

@Scott DeFries You should be fine to pull money out via an HELOC as soon as you own it.

@Jeremy Clarke Two options that come to mind that would allow you to do what Joe said and keep your existing properties and potentially still buy new ones are a cash out refi and a HELOC.

We have about $90k equity in our current place and would like to either rent it and use it as a HELOC to fund other investment properties or sell it and use the equity to invest. 

If you do, then you can take out a HELOC.