The Farm Overseer's House is a location in Blackreach, just northwest of the Tower of Mzark.
Background[]
Mushrooms can be harvested outside, possibly the farm's crops. Inside there are glowing mushrooms and two chests, one on the floor and one on the wall.
A well hidden geode vein is just behind the house. Unlike some of the other interior areas in Blackreach, the contents, including the two chests, respawn.