Zoila how much commission are we talking here?
If you are talking an 100k condo and the bank pays 2.5 then you are looking at 2,500 before broker split,time,and expenses.
Whenever I value a piece of business I look at time put in versus potential return. When you break down the numbers you will determine if you want to work it,the odds of closing it,or whether you refer it off for a fee to someone else and by the slim chance it closes you will make a little coin.
Remember the documents are almost the same on a 100k short as a 400k short so time is money. The seller won't pay for a mold test. If you list it just list it low to get an offer of all cash and disclose the possible mold. Send pics with the short sale package to both lenders of the mold.
Getting the 2nd to negotiate will be the hardest part. If both loans are held by the same mortgage company that will help.