This is an expensive and challenging option. 2.

If your floor is not level, you may need to prep it with a self leveler product, which can be expensive.  

If it is normal and it's out of budget for you, you can either use financing to lower your cash outlay, partner up, or find a different property.If the work is cosmetic, it wouldn't be a big issue to tackle on your own, but if it's more than that, probably best to play it safe and hire out.

Some of this will cover expenses, but the extra will increase their cash flow.

Interest rates were reasonable, though they will be higher now than a few years ago, but still probably lower than HML. 

This reduces exit options and affects the value. 10) Small number of small units is the most expensive residential development there is.

I'd like to find a way to cover all the expenses I still had to come up with myself 

If it's a refinance you might have buy down options available to get the rate a little lower.

All 11 were new construction with 8 being SFRs, 1 duplex, and 2 quads that produce an annual income of around $250K a year after all expenses. 

It may also be worth noting that this house is over 100 years old(but recently renovated) and in a lower income/higher crime part of Atlanta.