L12?
Tut, okay. In a desk drawer you find a small key that lets you in the two other locked rooms. All told, with the two open doors you passed by, and the door Theo opened, you can explore the five other midlevels.
...
The place seems deserted, but not rapidly so... three of the levels are living quarters, and are devoid of equipment or possessions. One of the levels is like the one you first entered- an empty workspace.
Tut, more search/scrounging turns up another, different small steel key marked "L12", plus you find a discarded robe with 10 gp in the pocket.
The fifth level, however, has some alchemical equipment intact. Looks like stuff for water quality monitoring and purification. A Scroll of Purify Water can be extracted from a locked cupbaord, easy to jimmy open or smash apart.
In short, nothing too exciting in these non-highlighted levels.
...
Alright guys, you can either make your way up the ladder to the top, or descend the stairs into the basement. Or, leave.
In any case, Thaka is still having mobility issues. Thaka, your DEX is 4 for the moment.