I plan on installing some form of termite protection after purchasing anyway, but is there anyway to make sure I'm not buying a house with a full blown infestation that could become a bigger issue?

@Matt OwensI did a HELOC on my primary to buy a couple out of state rentals when I first started.

But I am not planning to pay them extra 60 day rent for lease termination for lease that does not exist because Michigan does not allow automatic lease renewal due to insufficient notice.

If I buy the parcel from him, how does that effect his loan?

When doing a 1031 exchange, the same taxpayer rule applies, meaning the entity selling the property must be the one buying the replacement property.

Your due diligence time period would have been the right time to inspect further if you wanted to, to gather the info you needed in order to make a buying decision on your end. 

The judge did force the termination of the arrangement and my partner agreed to buy me out of the properties after the judge demanded they either buy me out or agree to sell the properties.

buying property is a huge deal - it has to be worth a couple trips. 

Just to use round numbers, I'm buying for about $250k and plan on putting about $200k into renovations and an ARV around $660k.

I'm buying and then not thinking about them for 20 years.