@PTR_K
Not really what you are asking for, but I am very fond of the Starship Geomorphs by Robert Pearce. But they are for sections of starships or space stations or ground buildings at that sort of tech level.

Which probably isn't what you mean by "otherworldy elven city."

(Note that while they are designed for the #Traveller Space #ttrpg, they aren't particularly specific to that game or setting.)

https://travellerrpgblog.blogspot.com/2018/10/the-starship-geomorphs-book-if-finally.html