It all depend what are you looking for in terms of quality, it can go from $35.00 sf and Up.
You need to know a list of things before you finalize your price.
-How much plumbing you need to do.
-How much electrical work.
- How much A/C work
-Type of drywall they want
-Type of paint
-Type of flooring
-Type of trim etc.
Make sure you got every detail before your final price.