The building was only slightly altered from its former use as a public school. The central hall was fitted with a heavy glass roof, and a fire escape was added to the eastern side of the building, allowing it to be evacuated within three minutes. Every part of the school was heated with hot water and an acetylene gas supply was installed. The central hall, classrooms, reception rooms and staff rooms were on the ground floor. The first floor was used for staff bedrooms, boys' dormitories, linen and the storage of dry goods. The third floor included the dining hall, kitchens, dining rooms and more dormitories. The bathrooms, engine room (boilers) and offices were located in the basement. The school was also provided with an isolation hospital, built in the grounds.