if the loan is a portfolio loan (the bank has it on the books) it would be possible to short sale.
but many commercial loans are "tranches" and securitized and sold to thousands of investors in tiny slivers... it would make it impossible to get s short sale done... it would be way easier to buy the first mortgage or any piece of it you can get your hands on and then go for foreclosure and pay off all lenders ahead of you.