@Matt Hazlett,
Matt,
I've changed my thinking on debt over the last 38 yrs of marriage. My first home had a 12.25% APR loan and it was easy to see that a goal of paying off the mortgage early was similar to expected mutual fund yields.
Today, as a REI, I look at it differently. My investments are making 20% cash on cash return with leverage. I have one mortgage at 2.625% APR.....why would I pay that off, when my capital could earn 20% elsewhere? Admittedly, I'm spoiled in Denver, where we've been getting 8 to 10% annual appreciation. (i.e. if 8% appreciation, and 25% down payment, my down payment is earning 32% annual yield in the short term. Leverage is helping me grow wealth faster).
I'd encourage you to see that if a rental with minimum down payment can earn 15 to 20% yield, and if the mortgage is 4.5% APR on that rental, then any extra equity that reduces the loan is earning you exactly 4.5% yield. If you've held your rentals for several years, is there a way to extract some of your equity, and grow your rental fleet?
I know a widow in Denver that 7 years ago paid $250k cash for a duplex. She loves the cashflow (no mortgage payment), and she's debt-averse. She's made good appreciation. Likely doubled value in 7 years. Her duplex is now worth $500k. But think about what she could have done putting $62,500 down payment on 4 similar duplexes. She could have had $250k down payment on $1million in real estate. When it doubled in 7 years, she could have gained $1M instead of 25% of that (with the 75% LTV leverage.
BRRRR is a clever way to grow wealth quickly, using max leverage. Decide for yourself what level of debt you're comfortable with.