Mark Masons' Hall in London is the headquarters of The Grand Lodge of Mark Master Masons of England and Wales, which also controls the Royal Ark Mariner degree. It is located in 86 St James's Street in the central London district of St James's, opposite St James's Palace. While Freemasons' Hall is the headquarters of the United Grand Lodge of England and the Supreme Grand Chapter of Royal Arch Masons of England, Mark Masons' Hall is the home of several other important appendant orders of Freemasonry in England and Wales.
The site of 86 St James's Street has been used for public houses and private clubs since the early 18th century. In 1702, the building was home to Williams' Coffee-House, a popular venue for the literati of the day. In 1749 the premises became a tavern. Following several other landlords, Richard John Atwood took on the lease in 1774 and ran the premises as a coffee house and a club. In 1772 had had established a club called Atwood's which counted the historian and freemason Edward Gibbon among its members. In 1785 the house caught fire and was destroyed, but rebuilt the following year. By 1801, the house at 86 St James's Street had become a public house, and was advertised as a place “where gentlemen meet on purpose to play at Billiards”. After 1817 the Union Club was based here until the pub closed down in 1820, when the premises were taken over by Carey’s, the map makers. In February 1862 the building was demolished following a successful application to the Commissioners of Woods and Forests to erect a new building for a club House and chambers.