Since 1973 it has served as the administrative headquarters of the Secretary of State for Northern Ireland and was previously the location of the Cabinet Room of the Government of Northern Ireland from 1921 to 1972.
Since 1973 it has served as the Belfast headquarters of the Secretary of State for Northern Ireland, Northern Ireland Office Ministers and supporting officials. It was previously the location of the Cabinet Room of the Government of Northern Ireland from 1921 to 1972.