Material is applied to all objects when I need it to be applied to a single object

Hi Guys, Let me preface by saying I'm new to Unity and I'm learning. I have searched for my problem but can't find anything relevant. Im exporting an architectural scene from 3dsMax to Unity. Im baking the textures via VrayComplete map and trying to apply them in Unity. My problem is as follows: when I apply the map to an object (lets say a wall) it will apply the map to all of the objects in the scene (the wall map will be applied to the floor also). All maps seemed to be mapped correctly (i.e. when the wall is applied, it's mapped correctly. When the floor is applied, it's mapped correctly). If someone could give me a point in the right direction I'd certainly appreciate it. Cheers.