Typical equity build up time is 5 years, depending on your market.But can you purchase another rental using your own capital?

(You said you could purchase them $20-$15,000 below market value. 

I purchased three out of state "cash flow" rentals with Evernest.

We would like to learn about how we should have went about it so that we can purchase more properties, minimize mistakes, and reduce our reliance on corporate life.

I did not attend the 3 day class, but purchased the self paced virtual version with the mind set that even if I only learned the how, it would be worth the spend long term.

If you do have to move because of a job, you would be safest (in my opinion, i am not giving legal advice or financial advice), i would sell that property to ensure that you did not just purchase with the goal of moving out early and taking advantage of lower rates and lower down payments for purchasing your home as a primary residence. 

I also am very interested in purchasing more STRs, and this is a really low risk way to see if I'm up for it (we have a 2.9% interest rate on our mortgage).My biggest concern is an ongoing plumbing issue we have had.

Purchase price: $850,000 Cash invested: $500,000 Sale price: $2,250,000 Purchased , knocked down, built new from ground up What made you interested in investing in this type of deal?

Purchase price: $90,000 Cash invested: $15,000 What made you interested in investing in this type of deal?

Since I will be managing it after purchase, you can be certain I'm not going to sell you a bad investment.