DUP Agriculture Minister Edwin Poots spent more than £1,000 of public money renaming his Stormont department's headquarters to mark the Queen's platinum jubilee.
The spending included £300 on hiring a small curtain for the formal unveiling of the new name, "Jubilee House".
Mr Poots announced the renaming of Ballykelly House outside Limavady in Co Derry last month after Belfast Live revealed in April he was considering the move.