Thrawn's office was connected to a training room containing two DT-series sentry droids. The droids were used by Grand Admiral Thrawn to exercise and train his martial art skills, as he thought physical well-being directly enhanced the mental as well.
Thrawn's art collection included a Bardottan statue, holograms of ancient Lothal glyphs, the Syndulla Kalikori, the old Jedi Temple Guard mask used by Kanan Jarrus during the rebels' mission to the planet Malachor, holographic examples of Mandalorian art from ancient crusades, a hologram of Hera Syndulla's family portrait from her father's office in the Syndulla residence, a hologram of Ezra Bridger as an Imperial cadet from Imperial records, and two Ysalamiri sculptures behind his desk. Thrawn also had a Phase II clone trooper armor helmet that had identical markings to that of Clone Commander Gree, and as well as a grail.
Thrawn's office first appeared in Star Wars Rebels "An Inside Man" in 2016.