UE4 Landscapes - Creating a basement

Hello,

Sorry for the vague title I struggled to think of a suitable one. My problem is I am creating a hospital in UE4 consisting of two floors, a basement and a ground floor. The goal is to navigate from the basement up via an elevator through the ground floor and escape, the level building is almost complete but the problem comes when I am adding a landscape as it goes “through” the meshes, in this case the elevator. Is there a way to get around this other than decreasing the height of the landscape around the hospital which would not work very well at all?

Thanks folks.

,I too am having a similar problem and would like to know the answer to this.