The rune's location is simply one of the few "secret" malas locations.
What happened was the owner of that rune initially placed a rune into one of the special hidden containers around malas which automatically marks a rune to a corresponding hidden location.
After that they simply placed a house up in the mountain and renamed their house with HTML Coding. At that point, any runes marked inside that house would create the same rune you have there. The reason there's only 2 houses there and neither house sign is like your rune is because the owner of it no longer exists there
The house fell and most likely eventually got replaced by those 2 houses you see now.
These runes are still easily creatable as long as you find a house with an HTML sign. They are a nice eye candy piece but ultimately worth nothing significant as they can be made as long as someone has access to an html house. There is a public one on ATL which has been there for years owned by Chamaeleon (spelling?) Which was right under the Malas Market mall. It's still there and the house name was something like "The Mystical Llama" or something to that nature, also in HTML. Feel free to walk in there and make runes hehe.
With the introduction of KR you won't be able to see those rune colorings anymore just as you wont' be able to see any other html coded items such as runebooks, house signs, and binding bracelets in color. It'll just be html coding written out.