how to hide mutiple gameobjects that are in an area?

i want to have buildings in my project that have multiple floors and during runtime floors above where the player is looking need to be hidden so they can see the one they are looking at. the camera is in a 3rd person "gods eye" setup. right now im using colliders to detect if the mouse clicks on things.

my question is how do i hide the floors and npcs and stop the interactivity of floors above the floor being interacted with without affecting the ai functions. like how it works in the sims games