[1][2] In 1809, Henry Thompson constructed a wooden pavilion with a colonnade as part of the wider development of the "Montpellier Spa" on land previously known as Trafalgar Field.
Thompson employed the architect George Allen Underwood, who completed the building with a statue of a crouching lion on the parapet.
[3][2] Concerts were held in the building including Jenny Lind in 1848 and the first performance of a Scherzo by local composer Gustav Holst in 1891.
[2] The front of the building has a colonnade of doric columns, a frieze of alternating square and rectangular panels and a parapet.
[2] The central wooden dome in the assembly room is coffered internally and has light entering via the lantern in the centre.