The Armed Detective Agency Office (武装探偵社事務所, Busō Tantei-sha Jimusho?) is the office where the Armed Detective Agency members work.
The Armed Detective Agency's office sits at the top of a slope near Yokohama's port. It's a reddish-brown brick building. It is situated on the fourth floor. On the door is a plate with the words "ARMED DETECTIVE AGENCY" written in simple, fine brushstrokes. 
The interior of the office consists of an office floor, a reception area, a conference room, the president's office, an infirmary, an operating room, and a kitchenette.