I am not a financial advisor and not giving financial advice.Reading through your post, your concern is risk management versus paying down debt, which might be a solution.1.  

Despite concerns over store closures, demand for retail space surged in the second quarter of 2024.

If you have concerns, don't buy. 

I’m concerned that holding this note may prevent me from closing on future deals due to DTI ratio.

Future risk is always a concern however never a value in an appraisal.  

I am contacting you to formally request validation of the alleged debt concerning this account and to inform you that I hereby dispute the validity of this debt.

Generally speaking, I have not seen underwriters look too deep into occupancy concerns related to second home vs investment property since Fannie/Freddie installed new LLPAs a couple years ago that make the pricing for each aligned in most cases.

We came into land from doing mobiles, rehabs and now do a few modular projects each year. 

Fairmount is a newer entity which is a little concerning.

This is a real concern, especially in competitive markets.