If your rate is low on the 5 unit, I might consider the possibility of a line of credit for my equity instead of an entire new mortgage.  

Everything he teaches about personal finances (budgeting, car loans, credit cards, etc.) is spot on.

In some cases they cannot pull the money out because it is now (Non-owner occupant) an investment and their credit union or bank may cap them at 70% or 75% MAX LTV.Nothing wrong wiht putting 10% down on a primary but look at the rates on both 5% and 10% usually when you have PMI built in the rates stay the same.

., a duplex or multifamily), you may qualify for a conventional loan with as little as 3%-5% down.HELOC or Cash-Out Refinance: Use the equity you’ve built in your current property to secure a Home Equity Line of Credit (HELOC) or cash-out refinance.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

We have credit scores over 730 and have been "soft approved" for around $750k. 

You are likely blending PMLs with HMLs here, most PMLs lend on a relationship basis and most HMLs underwrite the credit profile and risk of a deal. 

However, I've researched different ways of doing this, such as a home equity loan, Home Equity line of credit, and cash-out refinance.

Small banks and credit unions focused on farm/agriculture tend to be the most aggressive with land/lot loans.

For anything less than that with a traditional bank or credit union, you'd likely be looking at a portfolio product (the bank/CU will hold your loan and not sell it on the secondary market).