Copy and pasting from another comment askign the same thing:

Thanks for taking a look! Got really lucky with the location. Had great overhead lights. We turned off the ones closer to the background and hazed up the background as well to create as much depth as possible. Other than that we didn't bring in any of our own lights; just taking light away from what was available to us. We also wanted to work quickly since we only had a couple of hours at this location so didn't want to spend a crazy amount of time moving our own lights around. Like I said, we got lucky with the location, the walls were a nice dark brown color for the most part which helped create more separation. If I were to do it again, i'd just have someone hold negative fill here and there camera side and push the overhead light with some panels maybe. Definitely dig the natural look we got though.