Hello Elsa and Cesar,
There are different cash for keys programs.
One - if you do HAFA short sale, you might get money from participating lenders.
You have to qualify for the program.
Two - I had a regular short sale where the lender agreed to give the seller some move out expenses - also called cash for keys.
Three - Deed in Lieu of Foreclosure (DIL) - you give up the house and get some money from the bank.
Four - tenant gets the money in REO/foreclosed property. You have to have 1 mortgage only for this one.
Without knowing which one you mean, you can call Deutsche Bank directly and talk to their short sale department (it takes care of most situations).
Whatever you are considering - the only "good" option is a short sale.
DIL is truly a foreclosure in the eyes of your future lenders (mortgage and car) - as for the rest of your life you'll be answering "yes" to the question of foreclosure. You won't be able to get a government job either (requires no foreclosure or bankruptcy).
To discuss more specifically, please contact me off line.
Hope this helps,
Beachfront Realty, Inc.