It housed the Belfast Harp Festival of 1792, public meetings and, following the Irish Rebellion of 1798, the court martial of rebel leaders.
[1] The structure was built in 1769 by Arthur Chichester, 1st Marquess of Donegall as a celebration of the birth of his son, George Augustus.
[2] In 1786 a meeting at the Assembly Rooms rejected a plan to establish an Ulster-based slave trading company.
After the Irish Rebellion of 1798 rebel leader Henry Joy McCracken and others were court-martialled and sentenced to death in the Assembly Rooms.
Since 2016 the building has been owned by London-based company Castlebrooke Investments as part of their land holding for the Tribeca Belfast regeneration scheme in the recently branded Cathedral Quarter.
[3][2] The company proposes to demolish the 1875 extension and replace it with a 5-storey modern structure as part of a conversion of the building into a 50-bedroom hotel.