Load and Unload Level Stream with same Trigger

I am trying to build out a very large building interior. I have several floors with a lot of detail that has forced me to split the floors into their own levels and to even split individual floors into multiple levels. With that in mine I am trying to set up my player movement between all the levels. I know how to set up trigger volumes that allow for unload or load upon colliding with the trigger. I have the triggers set up at the door opening at the top and bottom of the stair case. When I enter the trigger at the top of the stairs I want it to load the floor below. but I also want the same trigger to unload the floor below when I am coming up the stairs.