Walls problem

Hi, how i can hide this, or making static camera? or making camera which dont go
through the walls? i m tryed hide it with transparency hitbox, but it work very weird, when i turn camera it dessapears too early, then i try to make walls with 1 polygon and it work for some situations, but the colums not hidden bcs have 4 side,
i have problem with 2cnd floor, its overlapping.


i need something like this in any place :