EDIT: Here's a list of the map notes, and what they are, going clockwise from the bottom.
Imperial Hall
Shrine to Ineania
Library
Laboratory
Office of the Arch-Magi
Office of the High Arcanist
Office of the Guard Captain
Shrine to Farallis
Lecture Hall
Guard Barracks
(There's a storage room below the Guard Barracks, forgot to open the door)
Shrine to Lochwar
As for the 3 map notes in the middle, the innermost is the Council Chamber, the ones in the hall are just the halls dedicated to certain people for their contributions to the Guild. (Oh, and I'm not releasing the names yet, I thought it would be a nice surprise for the people to whom they are dedicated).