Yo, I got a few things you might wanna thing about implementing.
1. Please clip your stairs :< Haven't checked all of them but the stairs I did check were not clipped properly/at all.
2. you should prolly replace all the animated bushes and trees with static versions. Even though it does add a bit of immersion or whatever, it has downsides. They mess with the shaders of dynamic lights, i.e. flashlights. Also, when rendering the whole map at once, it even shows up that there are too many vertex format changes on the map happening at once.
3. Just a tip, cuz I haven't noticed any, might be wrong though. Look into Occluders. If you're using them, feel free to ignore.

I would also think about adding a few more area portals to the secret entrances etc in the shops and stuff.
Also, bloody great displacement work! :D