your issue is not one of money, its one of priorities. your tenant no longer prioritizes rent, because you have allowed your agent to deliver the message that rent does not need to come first. when the tenant knows her roof is on the line, she will let other bills fall to the side in favor of rent. 

I have a good deal in sight but before I make a move on it I thought maybe I should have a good attorney lined up?

If they do accept what's offered, it's by their choice and its in line with what their analysis says is their highest and best recovery amount.

Your hard work is helping others, bottom line.      

The fact is your loan will be small and the price differences between lenders are more apparent on larger transactions.The biggest difference between lenders is going to be the actual loan officer and how good of a job they do getting you approved and what products and structure they give you to get this loan and set you up for future investing. 

I think it was only line of credit like a mortgageHELOC = home equity LOC, which means securedby your home as a primary residence.Mortgage or othe type of loans can be done on investments, but I'm not a lender.Ask @Chris Mason 

But you want to line up your buyers and know what they want and how to find what they want.

Me personally I would use the business line as a down payment source to pair with bank\private financing.  

But you should keep networking and asking other mortgage loan officers if they have those types of products.

Had this financing lined up where told me they could do up to 75% (or 15% down), however when I actually got all the paper work ran through they will only do 85% down on multi family.