This estimate included adding ridge and soffit vents, ice guard, and new flashing on four chimneys. 

The rent should be high enough to over all of your expenses, with extra. 

@Doug Pintarch I'm proud of you my friend and am super happy that you took those extra steps!

@Aaron Johnson1-4 family homes are FHA eligible.FHA limits are based on each county around the country and the owner's ability to pay.FHA includes mortgage insurance for the life of the loan.you can put down as little as 3.5% for a 1-4 family home.there are some allowances for adding closing costs to the loan.

Where is that extra $20K hiding?

One big advantage of a seller financed note is that, in the future, you can try and negotiate a lower payoff amount If they owe what its worth, you don't get that extra bonus in the future.

So in 5-6 months from now you could have an extra income through cash flow of $2650 Dollars per month. 

Are there any added fees or anything else to consider? 

Some of the larger expenses-Interior/Exterior Paint, Storm shutters for a few of the front large windows, added additional cabinets to one unit,  New refrigerator from Dent/Scratch store after old one died,  Laundry units that tenant pays +$50/mo for etc. 

But, if I can't create those 3 sentences and make them compelling, I'm not gonna spend the time to look at it deeper.Of course, most properties don't (arguably) have compelling theses, so people have to result in hand waving and distraction to make the seller feel like the commission is adding value.