If there are different options where I could do a 10 or 20 year loan or a 7/20 year balloon or who knows what else is out there than that seems like a better option if my fears in concern #1 are accurate.

So if I only have a property address what would be the next step the fastest most accurate way possible!

Repairs are estimated at 6k But I’m not sure how to find accurate comps for a duplex that make sense on the asking price.

I don't want to cut them loose if it's true and accurate they only need 2 weeks.

If I could accurately estimate how much it would cost and it made sense, I would probably move a few walls to make the living room smaller and put a master bed bath where the kitchen and part of the living room were, but I think that would be crazy expensive, but maybe not.

I'm thinking of asking 3 - 4 contractors to give me an estimate based inspection report and then pay 2 of them to come onsite and have the specialists loook at it and get a more accurate estimate I can use to negotiate with seller. 

This has recently gotten more complicated as I've added partnerships and am now dealing with K1s which necessitate accurate balance sheets.

However, I personally feel you should never really on someone else's numbers until you have worked with them long enough to know how accurate their information is.

@Nicholas Arthur Hogan  You could do rough estimates on the utilities, however, ideally you would want to call the gas/electric/water company and get historical costs for that specific property so you can be as accurate as possible. 

I do see the interest with its proximity to Crosstown, but it's a gamble on how long it will take for the surrounding areas to be impacted by that development and you would want to be sure you don't lose money waiting on the appreciation that may or may not happen.