Does Bluetooth 4.0 penetrate concretes?
You will need:


The steel framework design of the walls,
How thick are the steel bars,
How separated are bars,
Which kind of concrete is used in the wall,
The thickness of the wall.


Besides, you will require to know the following:


The distance from both devices to the wall,
The bandwidth required to be transmitted.


With that, you can make a very simplified FEM simulation in order to calculate the signal attenuation and only then you will be able to know if the Bluetooth is able to accept the level of attenuation you are getting.