The MCA (former Maritime Services Board (MSB)) building has a six-storey central tower with lower cross-wings. The central tower houses plant and a former caretaker's flat, and gives access to roof terraces over the cross wings. The principal entrance is centrally located on the eastern side of the ground floor leading into the entry foyer, with a mezzanine level. To the south of the foyer is the former Wharfage Hall, a major two storey public space. The staff cafeteria was originally located at the northern end of the ground floor.