Pretty good flip if the owner cooperate with cash for key.You have to be very careful as buying junior liens can be very risky & you need to keep the senior liens current so they don't foreclose.  

I want to know if anyone can give me some advice as far how to find builders who are willing to cooperate with certain types of construction loans.

We use Bill Cooper Jr of State Farm for insurance on our rentals. 

But for a short sale, you'd need the participation/cooperation of the home owner. 

But if they don't cooperate, nothing will happen.And usually someone has to be pestering the bank to make things move along.

Biggerpockets not cooperating this evening.

Even though the seller is not our "client" we do have to engender their trust and get a lot of cooperation from them in short sales.

Needs Seller cooperation and everyone understanding the pit falls

Liz Chen I agree with most of what Tom Cooper said.

If the repairs are minimal, you may be able to get into the property pre-closing - with the seller's cooperation of course - and make the repairs.