here we go...
'An imposing art deco building, covering two and one quarter acres, it was built 1927-1933 as a memorial to the many Freemasons who died on active service in the First World War. Initially known as the Masonic Peace Memorial, it reverted to the name Freemasons' Hall at the outbreak of war in 1939.
In 1925 an international architectural competition was held. One hundred and ten schemes were submitted from which the jury - chaired by Sir Edwin Lutyens - selected ten to be fully worked up. The winning design was by the London partnership of H V Ashley and Winton Newman. The building is now Grade 2 listed internally and externally and is the only art deco building in London which has been preserved 'as built' and is still used for its original purpose.'