Hi Brian,Assuming this is a life insurance/agency loan, the loan documents should detail any loan assumption fees.

I took one on my primary residence, paid no origination fees, and make no payments on it unless I use it, and only pay $70/yr maintenance fee, so if I never touch it over the life of the HELOC (10 years) I'm only out a total $700 in 10 years, which I think is reasonable for the access to the cash.

And my units have a lot of deferred maintenanceAt the end of next year the seller financing will be done, and an extra $4000/month will ease the pain.I think I will survive it, but in hindsight, life was great without them, ok with them but make sure you can let someone else manage them.

If the insurance company does not require a new roof I suspect I can get 5-7 years more life out of it.

What is the age and current condition? 

Good point on the temp Bryan, glad to have a contractor in on the discussion.As far as the boiler condition, it's in the basement which gets fairly humid, inspector just made mention that some of the control panel, circuitry, components, etc look rusted and should be serviced as a precaution.

I've gotten 8 pre approvals in my life and the effect on my credit was pretty minimal. 

I've seen the areas you mentioned on some of my searches, but if you're local and can see the conditions first hand, I'm confident in taking a look at the same areas you mentioned.

Discovering bigger pockets has been amazing and an eye opening moment in my life!

Sounds like a hard money loan....buy the house, make the fixes and then refinance if you are going to keep for a rental or home purchase.Lots of normal lenders will not lend on homes that are not in good condition.