HELOCs have higher interest rate but much lower/to nearly no closing costs, refinancing has much higher closing costs but lower interest rate.

If I were to BRRRR a quadplex, when it comes to refinancing, would I be able to structure the loan as my primary residence (house hack it).

Make sure you work with a lender who understands cash-out refinancing to get the best terms.Feel free to reach out if you have any more questions or need further clarification. 

With the potential for a Fed rate cut on the horizon, it's a great time to consider refinancing or purchasing a home.

Maybe refinance in a few years and buy your first investment using the money you’re going to get out of refinancing?

Depending on what your current interest rate is, it may be worth looking at refinancing the loan to get a lower rate?  

What is the downside of using a commercial lender to purchase, my own cash to rehab, and then refinancing?  

And FYI not everyone is going for the 10 year fixed period, some people are saying "I'd love it fixed for only 3 years, I think rates are going to be drop, and it'd be great if my rate dropped automagically without refinancing." 

Whether that came from earlier deals refinancing out of bridge to roll to long-term debt or if it was for acquisitions, I don’t have data to answer.To your question about competing against high IRRs when raising capital—you are right.  

If you refinanced the same 400k with no PPP at 5% that would be a payment of 2147, or a savings of 514 a month.