Chief of State's office
The primary workspace for the Chief of State of the New Republic was situated inside the former Imperial Palace on the planet Coruscant.
History
The main chambers utilized by the Republic's head were in the office of the New Republic's Chief of State, located in a room found deep inside the Imperial Palace on Coruscant. Featuring red colored walls and "windows" displaying live holoimages of the outside world, two distinct Chiefs occupied the office during its period of use. From this very office, Chief Mon Mothma gave instructions to agents Kyle Katarn and Jan Ors before they were deployed to Artus Prime. Subsequently, Chief Borsk Fey'lya would take over the office until his demise and the office's subsequent annihilation in 27 ABY.
Behind the scenes
Interestingly, the vast windows and the red coloring of Mon Mothma's office had a similarity to the Executive Office of Supreme Chancellor Palpatine.