Explain the transaction, they will know the process. 

I haven't had a bank or finance company distinguish between "business credit" and personal credit.

My issue is that once I put down the required 20-25% the mortgage amount is not feasible for the regular go to banks because the mortgage amount is too small and not worth it.

This is in the midwest area.The listing says that the duplex is occupied with two tenants who are interested in staying for the long term, and have a consistent payment history.I haven't gotten much information, but I'd say for the area, each tenant is paying 800 dollars per month.Now I am 21, and I have about 20k in the bank, and im willing to spend 15k for a down payment.

Biggest lesson learned is to have pictures of your TV and DVD remote controls on your phone, so that you can reference them when trying to explain to a guest how to use them. 

@Scott Royer you need to be very careful.They can't qualify with a bank which indicates they are high risk.

its as simple concept as this  " BE THE BANK"  then of course there are variations of real estate debt.1. 

From what I have read, banks would not loan to new LLC's without proof of income.Furthermore, I have inquired for a lawyer's assistance with LLC formation and he quoted me $2000 to $2,500 for professional fees.  

Does anyone know a bank or lending institution that would lend based on a properties income as opposed to personal income?

If he doesn't have regular paystubs, you can still request proof of income such as bank statements or tax returns.