First of all i want to say that this map is really really visualy appealing. You see that you have put a lot of effort into it looking good and looking persisten. I think with a few tweaks here and there this map could very well be accepted as a competetive map. But there are some (minor) things that need change:
1.I think mid is to open. A good Awper on T side could be able to pick a ct trying to go a at the start of the round. I would recommend to put a door or something there to block the view.
2.The entrance to b from mid is to far in direction of ct spawn. It should be more towards the t spawn so cts can hold it more easaely.
3. The stairs leading to a from under it should be a bit more back where there is some free space now. It would make it easear for cts to hold it.
4. The upper appartment next to ct spawn is not yoused for anything other than saving. Its just an excelend camping position allowing for some free frags on players trying to hunt you.

But all in all i think this map is really nice. The idea with the glass floor allows for some lucky frags from the t side while cts can hear t long bevor they are in the site because they are under them. The windows in the house in front of b allow for some nice smoke throws and the map is really visualy pretty and consistent in its style.
Hope some of this feedback helps you.

P.S. I would really love seeing this map in the reals competetive map pool me and a few friends had some excellend rounds on it.