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I've just been through this in a commercial grade build out (albeit the problem was from neighboring units but they let us isolate from their side).
I'm a little surprised that you're having problems with concrete walls as that's the desired material if you;re building from scratch.
There are a few simple things you can do though.
1, Get a thick carpet or rug - this will help to dampen frequencies that are easily transmitted through floors.
2, Make a window plug - often the noise goes through path of least resistance or weakest link. You can make it with a thin piece of ply cut to the exact size of the window. Then using strong spray glue (I use Auralex Foamtek for this), glue thick acoustic foam (also known as Amerimat) just larger than the window hole size. Screw some handles to them and you have a good window plug.
3, Recoil stabilizers will help isolate bass frequency transmission from your speakers.
4, You could add a layer of quietrock (ideally with resilient channel clips) to the existing wall but this will cost $$$ and require a contractor in most cases.
5, You could also install an acoustic ceiling - it's not as difficult as it sounds, you just have to run the framing then get some decent tiles. Also an idea to attach sound Batt to the ceiling leaving an air gap between the drop ceiling.
Other than that, you're fucked if sound is carrying in a concrete building.
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