Depending on the LTV, FICO and PPP you may achieve a low 7% rate on a 30 yr fixed loan 

If you do the work on the front end, you can save all those taxes paid and get some additional benefits from holding the properties, and still achieve your freedom level. 

I’m looking for advice on how to setup a structured partnership with my in-laws so that both parties achieve their goals.

Yep as said above, DSCR is typically the way to still achieve 30 year amortization, fixed rate at 75-85 LTV. 

The successful sale at $319,000 underscored the value of strategic planning, effective management, and robust partnerships in achieving high profitability in real estate investments.

Your challenge will be that the taxing authority has already take about 15% off the actual market value to achieve a "just value" of your property.

Make sure to connect with local lenders and brokers, it will be beneficial for achieving your real estate goals.

Long story short, cosmetically ugly and out of style is fine, not functioning isn't and WOOD ROT is a major no/no with FHA and VA appraisers.

However, for physical goods and services, achieving post-scarcity on a broader scale is likely to take longer.Advancements in automation, artificial intelligence, and biotechnology could potentially accelerate progress toward post-scarcity by increasing productivity and efficiency in resource allocation.

Those examples are to show how achieving an exponential return instead of a linear return is better.