Thereafter, it became the residence of the Prime Minister of Northern Ireland, Sir Basil Brooke Bt (Sir Harry Mulholland's brother-in-law).
Sir Harry purchased Sir Basil's town residence, Storbrooke, on Massey Avenue, thereby effectively doing a house-swap.
Since the devolution of government, Stormont House is no longer the Speaker's residence.
It is now used by the Northern Ireland Office.
The building was extended in the 1970s when a large two-storey administration complex was added to its eastern side.
First published in October, 2014. I am grateful to the Lord Dunleath and DOENI Historic Buildings branch for information regarding Stormont House.