need to be clear in my understanding

[Account Closed]

when we receive a call from a motivated seller from bandit signs for an instance: 

the clean and hassle free deal is: The get the offer accepted to cover for the amount that's owed to the house, may little extra for the seller to move on and my fee let's say 10.000.00 to assign the contractor to the end buyer. Say, that the house is worth 100.000 say they owe 50.000, plus 5.000 to seller to move on, thus 55.000, plus my fee 10.000, then assign the contract to end buyer for 65.000, then if ARV is 100.000 rehab cost is 15.000 then end buyer will profit 20.000. correct? Bank is happy because it got payoff. Done deal!

Q? what if this house is owned by fannie mae or freddie mac? remember this house was not listed on the MLS, is was off the market. Can I do assignment of a contract?

Now! if the house is foreclosure or on short sale status. 

Q? Can we assign the contract to do wholesaling on short sale? Is it the same issue that...if it's owned by fannie mae or freddie mac.  how about if these property are not fannie mae or freddie mac.

I am asking this because, I have some bandit signs and I want to clear undesrtand this, before a get some phone calls.  Fell free to add some more detailed comment that will help me to cover some other issues, that I did not face yet.  and what to look for and what questions to be aware when motivated seller calls. I just dont want to waste time looking for some deals, that in reality will not work. Thanks guys.