@Robert StephensonIf you have enough equity in your primary or rental you can get a HELOC or HELOAN and use the proceeds as a down payment to buy another rental.

It will probably require $100k plus to proceed.

And you must use all of your proceeds ($300K ish).   

And you can use that to calculate your tax hit.In order to defer all tax you must purchase at least as much investment real estate as your net sale using all of your net proceeds.

As important a consideration is how will you reinvest/spend the proceeds from the sale to build wealth.Hope this helps.

The proceeds could be reinvested into something with better returns or even used to simplify your finances(Like Bettment still offer 4.75% for new customers, and you don't need to do anything!).

However, this is not a cash out refi.Cash out refi is when you refinance an existing loan, with another one (i.e replace the loan) where there is enough money left over at the end of the process where you can put some proceeds in your pocket.When it comes to your strategy - just make sure you're being conservative with your numbers on the purchase / rehab if you don't plan on using other proceeds to payoff the HELOC. 

I'm going to reiterate what's already been mentioned above, but I'm going to actually give you examples of why it's relevant to you to find a U.S. tax professional.1 - You're going to need to file U.S. taxes once you have property down here, there's federal filings, state filings, and sometimes local filings too2 - Tons of tax treaties between the U.S. and Canada that are easy to miss and can cost you a lot of money (important one with rentals - effectively connected income - if the professional you talk to doesn't know what this is, run away)3 - The amount of days you spend in the U.S. needs to be tracked and if you go over a threshold, all of your worldwide income could be taxable by the U.S.4 - Selling real property means up to 15% of your sales proceeds might not be available to you for years (FIRPTA)5 - Lots of nuance at the state and local levels, which both want to take as much money from you as possibleMain takeaway here is that you should find a U.S. based tax person.

Quote from @Fernando Martin-Gullans: Hey y’all, I’m a retail investor with 2 SFH rentals worth a combined ~$650k looking to utilize some of my stored equity to buy more out-of-state properties, but I’m not quite sure how best to proceed given that my interest rates are incredibly low (leaning me away from refinancing) and neither property is owner-occupied (which I believe prevents me from using a HELOC).

Let me know how you’d like to proceed!