Unity/Blender - How can I hide walls from buildings modeled in blender? - unity3d

I'm working on a Unity project with a city. The player controlls a flying camera and can move around freely. It's important, that the player is able to see the interior of the buildings. Therefore I need to hide the walls from my houses, when the camera is near them.
As the player can rotate the camera, only the 2 closest of the 4 walls should be hidden.
preferably, I would only hide the upper 2/3 of the wall.
What is the best way to achieve this?
Should I edit the blender models? (Can they get wall-checkboxes or so?)
Should I export every wall individually and put them back together in Unity? - As there will be over 100 houses, I could imagine this option getting quite laggy.
Should I hide them by manipulating the mesh-renderer in Unity?
Im not an expert for unity or blender, as you might guess. So I'm really thankful for any help!
Thank you a lot for your time and your effort! :)

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I have 4 different FULL tiles: Road, Trackside Grass, Grass, Water.
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So I have been working on this little project, and I ran into a problem that I would like to fix before I continue. I have a wall that's part of the tile map, and I need to hide the characters obstructed by the wall, when they are behind the wall, without hiding them at all when they're in front of the wall. If I set the order in layer of the sprite lower than the layer of the wall, then it will look right when the sprite is behind the wall, but not correct if the sprite is in front of the wall. If the order is the same or higher than the wall, then the opposite is true, looks fine in front, doesn't work behind. To show exactly what I mean:
When the sprites order in layer is set lower than the wall
when the sprites order in layer is set to the same or higher than the wall
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figured it out. The wall and sprite need to be on the same order in layer, then go to
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Unity 3d player controller that can walk on walls?

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Unity 3d - Explosion Area Damage

I've developed an airplane 3D shooter game. In this game, I want to make my plane shot a bomb. When the bomb gets to the enemies it will explode and give damage in the area of explosion.
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