The building is built in two parts. Dispensing with the oft-found central light-well of contemporary buildings this size, the central core containing the recording studios was a windowless structure built of brick. (Structural brick rather than steel framing was used in order to reduce noise transmission both from without and between studios.) The surrounding outer portion, designed for offices and ancillary spaces, is steel framed and faced using Portland stone. While the outer portion had plenty of windows, the inner core required special sound-dampened ventilation systems.