I dont put general per square feet cost to rehab. I usually walk thru and figure out the cost.
Have you done a walk thru yet? If so, make sure to photograph as much as possible so you have photos to do your listing when you try to wholesale.
Most wholesale deals are crap because either the repair is too low or the ARV is wrong.
I dont work that area, I can't really help much on values and what is good out there.
If it is tenanted, it means everything is in semi-working order. I bet there are issues and deferred maintenance, but hey, we are buying at a discount for a reason.
You need to do a walkthru before you offer. You can ask for an idea of what she wants, and if you feel there is a chance of deal, go see the property, and calculate your costs.
That is kind of far for me, otherwise I would offer to go do a walk thru with you.
80% of the houses I buy I put new HVAC, new roof and have some main drain problem. I just budget for it now. 2000ish for flat roof, 4000 for HVAC and 500 for main drain.
Just that will up your cost per sq feet.