It's no different than their 2-year, low interest rate teaser houses.

My main concern is the interest rates being so high now as to whether what I'm hoping to achieve is really even possible. 

I'm not a fan of complicated electronic locks because they have a high failure rate and are often very easy to hack.

For a cash out refi, you are generally limited to 75% LTV and rates right now are in the mid 7s for good credit and a DSCR over 1.0. 

For the $525K property, with the low mortgage rate(you will probably never get a such low rate), it might make sense to hold onto it for now, especially if you can still sell it as a primary residence within the next three years and avoid capital gains taxes.

So you are better off finding someone who wants to rean interest on their money and getting a promissory note signed and giving them a 10% interest rate and having them give you a 15k loan interés only for a 12-24 month period.

@Stephen Fleming your cashflow probably won't be what you think it will be:(Have you factored in the new property taxes at homestead millage rates?

Tenant covenants and agrees to pay interest at the maximum lawful rate or eighteen percent (18%) interest, whichever is less, compounded annually, on all unpaid Rent, damages, and other amounts owed by Tenant, excluding late fees, from that date of Landlord’s final accounting until such time Tenant pays all such outstanding amounts.

We’ve tried other platforms on the market, but the message delivery rates were very low compared to the 85%+ I get here.

Although the Joshua additional demand is smaller, it is closer to DFW, which means its rental rates will be higher.