Homebrew:
Homebrew Map for Delver’s Guild Library and Maproom
This is a great map of a library which you could use in Ptolus for the Delver’s Guild Library and Map Room or if you had a homebrew library.
The map does show the library on a cliff, but you can tell your players to just ignore that. If it’s a super big deal, Contact Me, and I could do a rough Photoshop edit to put grass all around.
There is also a 5E one-shot adventure written for this map by its creator CZ RPG / Mimicmaps. You can find the details, and a patreon link, on the reddit post The Great Library.
Library First Floor
Download High Resolution Library First Story Map
Library Second Floor
