In the dream described by me there is a detection of new personal space (I have found out the big building). It is a lot of it (a lot of place, very high). This personal space is subject to me (I can create rooms). Beside a water basin with a falls, with ����-dark blue water - a huge congestion deep unconscious. In general such combination - a water basin similar deserted and and the Building - stone, grey. Reminds a fortress centuries - two& back (and can and more) existing. It could be the prison, or simply a fortress detached from an external world.
For the person these spaces are familiar (the brother already knows this building and a water basin, and I (consciousness, Эго) only find out).
Welcome, Maxim Dreamer! Wow, all the way from Russia! I'm sorry that I don't know how to say hello in your language.
Sounds like you've already done some research! Yes, the building represents spiritual, physical and/or emotional space. The brother may represent male aspects of your Self that your unconscious wants you to connect with. The woman may be the female aspects of the self, or a woman in your life.
Water can mean so many things, mainly the emotional and spiritual. You'll need to look at what's going on with you to understand this.
I realize we may have a language barrier but don't worry - correct me if I don't understand and we'll get it figured out eventually!
Here are what I see as your main symbols:
Buildings Water Woman Man