20X20
The One-Eyed Jax is a tavern located on the north bank of Luskan. Owned by Jarlaxle and under the "protection" of Ship Kurth (and watched over by drow), it is the safest place for merchants and adventeurers to stay and plan their journeys.
Priestess Dab'nay Tr'arach of Bregan D'aerthe is the primary barmaid within the tavern and keeps a close eye on all those who pass through.
Level 0: Basement
The establishment has two separate cellar rooms connected through a secret door.
The "obvious" cellar is accessible through the kitchen and holds mundane items used for the tavern's business.
In the last barrel from the ladder, a secret door leads to the "hidden cellar", a gathering place for Bregan D'aerthe. This part of the cellar is accessible through a ladder underneath the staircase in Dab'ney's hidden area on level 1.
The tunnel to the south leads to the ruins of Illusk and the real headquarter of Bregan D'aerthe.
Level 1: https://inkarnate.com/m/DX07NZ-one-eyed-jax-tavern-level-1/
Level 2: https://inkarnate.com/m/Gz0zOp-one-eyed-jax-tavern-level-2/