I'm a little confused by the wording "approved bank short sale negotiation fee." Did that come from the agent?
Have you seen the actual approval letter that states the bank wants 599K by a certain date? Who has been in contact with the bank..i'm assuming only the listing agent.
Also, it will be very difficult to flip a property like this..especially since it is listed. If you plan to buy it, and then re-list it...why would anybody pay more than 599K in a declining market...all they have to do is look up either county records or the listing records and see that you just purchased it for 599K...which has now become the "market value" for that house.
You mention the appraisal value is much higher...what sort of documentation do you have to back that up...has there been a recent appraisal done (in the last 3 months?)
And if this property is such a good deal, how come there aren't others writing offers at that price...
Also it sounds like your plan is to contract it...have the listing agent cancel their listing with the seller...and then you re-list it with either the same agent or another..that might be a tough sell to the listing agent...all they really want is a transaction to go through. They really don't care if you make money or not on the flipping side...so be careful when you take advice from them on the current value.
Your exit strategy is important and you can sell to a financing buyer as well as a cash buyer...however it will be extremely difficult to double close (and when you say this are you actually going to fund on your end, take title, and then close again with your end buyer? Or use your end buyers funds to close?)
There are a lot of fine details that go along with a short sale flip...and this might not be the one for you to start with.