Accepted their counter offer of $35,000 How did you finance this deal?

Start there and complete your due diligence.If that fails, you either back out or estimate the balance the best you can and send your counter offer or request for repairs.This is stuff your real estate agent should be advising you on, do you have representation in this transaction?

Make a counter offer you can live with either way.

You can counter offer again around 60-65k unless they already told you that 80k was their final offer.

FYI each counter offer is like a brand new offer.

See where they want to take it as far as a counter offer.

What do you feel would be a fair counter offer for both of us?

A good option, in my opinion, would be to tell the wholesalers exactly what you are looking for and counteroffer anything they bring to you that is outside that to the point where it would work for your numbers.

But if he's selling one of 50 identical properties in a development, you just might be in the driver's seat.Your offer should be high enough that the seller responds with a counter offer instead of a $%*# you.Put yourself in the seller's shoes. 

I agreed to counter offer and was able to bring down the price another $2500 after inspection ( I asked for 4K).