Consider a tarp curtain room divider. Either that remotely drops from the ceiling or a curtain style you can pull from the side. It's out of the way when you don't need it, but gives you the ability to divide the room up as needed. Great option when you need to split the team for teaching skills, covering certain drill situations, and if half the room is needed for a wrestle-off. It blocks the others sides view and a little of the sound, which helps cut down in the distractions that usually occur when splitting the team up.
Also having some type of nearby bloodroom/space with a small clean up sink. Always a nice addition so the kids can get back on the mat faster. Maybe something by the manager/trainer hangout space since they tend to get called on to find the med stuff for the cleanup.