One solution could be a Debt Service Coverage Ratio (DSCR) loan.

For active investments I advocate considering how you can diversify WITHOUT ceding your competitive advantage nor the superior profitability of the niche your in.As an example my business is running an investment fund and syndication high interest commercial mortgage loans secured by income producing real estate. 

Rates are high, usually in the high 8s or low 9s, and you may pay 2-4 points on the loan. 

This property is in the next state over from me (only about 90 min away) and is a 5 unit, therefore I'm looking at a commercial loan. 

If so what are his loan requirements?

It’s a bonus if the bank offering the HELOC also handles BRRR loans — they’ll be more flexible and accommodating when it’s time to pay off the HELOC with a new loan!

When your LLC takes a loan, expect as members to personally guarantee the debt.

Quote from @Burke Atkerson: With over a decade of real estate investing experience and over 100 flips, I now provide private money & hard money loans.

If it is a good business with a hard to finance issue, he'll work with the loan team to figure out how to lend to them.

My biggest fear is that if I ever were to quit my job, I would no longer be able to invest in more real estate (not sure if I would qualify for loans as easily).