@Michael P. thanks for the shout out... kind of :)
@Christopher Abele
There is a lot to dissect. Is the house in a suburb if so which one (we own in South Toledo, Maumee, Sylvania)? There are sections of Toledo where rentals are scarce. At 112K plus money for rehab does it cashflow at $1100-$1200?
To answer some of your questions. I'm assuming the seller doesn't have to walk away from the mortgage. If he just wants to subject to the property then that would be better. Just pay off the ex and take possession of the home and pay your friends mortgage until you figure out the rest. You need to find a sales contract and a title agency that knows this type of transaction.
If seller no longer wants the mortgage. Then I would take out a loan from your 401K for whatever the max allowable is currently. 18K doesn't go very far if you need down payment and rehab. I would talk to a hard money lender or find private money to purchase the property and then rehab. This is basically a BRRR at this point. Run your math.