It has a Shooting gallery, which Pierce Carradine controls and assists in Aya Brea's training sessions. There's a Firearms Control room where Aya can talk to Jodie Bouquet and use BP. There's also a parking lot garage with a save point. Baldwin's Office is located, here.
Aya's and Pierce's vehicles are located here. Aya's trunk becomes available during her 2nd time at MIST HQ. There is a save point at the far end of the room and a Recovery 3 behind Pierce's vehicle (both times). The Firearms Control room and Bouquet's Guns and Ammo shop are available for purchasing items and picking up Shooting gallery prizes.
Baldwin's Office[]
Not officially named, but given it's own room ID#, this location is used for the post-Akropolis Tower cutscene where Aya is given her next orders.