It seems that this was originally a narrow opening leading to another street, but after some heritage quarrel, someone decided to obstruct the passage. There used to be a tiny shop, obviously closed, but someone seems to live behind the only window.
The “narrow” sign in front of the building was there for some road works, but I feel that it was at its right place!
The street name (the Water Tower Street) could possibly interest especially one blogger who has a passion for nice and decorated water towers. I’m sorry hpy, there is no water tower around. It seems that there used to be some kind of fountain.