I am out $500.Really all of this comes down to your ability to market and sell this setup. 

I have only had one tenant call me concerned about her ability to make rent.  

Since the logger only had interest in the trees, and I had the ability to market and sell it for a significant profit, it was the perfect partnership.

You don't have any real confidence of your ability to do this but you want the bank to make a bet on you. 

I am single, and do not currently own any real estate.I’m faced with the ability to purchase a home (valued at $180,000) from my parents who currently owe approximately $100,000.

I am single, and do not currently own any real estate.I’m faced with the ability to purchase a home (valued at $180,000) from my parents who currently owe approximately $100,000.

You know the current tenant and their ability to pay.

If the complex already has it, you should be able to keep it (you will need professional management and the ability to check all the other boxes).  

This will greatly affect my ability to pick up commercial lots.

They will look at your ability to afford it--having a rental lease in place helps your financial picture, which is why BRRRR advocates have the "Rent" before "Refinance," and they will typically do something like 80% Loan to Value (LTV).