Unique art is listed as an example of a great place to explore in Wayfarer Help.
There are some apartment/neighborhood signs that have unique features, such as decorative fountains, sculptures, even hand carved and hand painted signs. This one I don’t see as being artistic; I see it more as noting the address and building name, more as being an advertisement.
I do tend to follow this in the Unique Art criteria clarification when it comes to these signs. While it mentions business signs, which can be advertisments as well, it’s a unique sign that artisiticly represents the business and is unique to it.