If I were to put 2 of these side to side in a commercial office kitchen, how much clearance do I need between the fridges for the doors to open?

I was worried about that because my old frig was up against a wall on the left and when I had my kitchen remodeled before the holidays, the contractor assured me that he could swap it with the cabinet on the right, but I didn't like that configuration. So one night after work before the appliances were to be delivered, I stopped by the store and asked with one of the sales guys. He showed me that Whirlpool makes the doors now so that you don't have to worry about that. When open, they are flush with the sides of the frig. Don't laugh, but when I saw your question, I immediately went into the kitchen and opened my frig doors to make sure!
But...and this is really important, I would still leave a little room so that the motors get enough air circulating and don't overheat. That's what happened to an older refrigerator I had that was enclosed by cabinetry. It overheated and eventually burned a hole in my kitchen floor!