's additions shows an additional storey on the wings. The wings later gained a fourth main storey, and the central section gained a third. After the fourth duke's death in 1817 ownership was taken up by
the Crown so the building could be used as the residence of
Princess Charlotte of Wales and her husband
Leopold of Saxe-Coburg-Saalfeld, the location of the house (north of
The Mall and east of
St James's Palace) making it convenient as a Royal Residence. The Princess died before the purchase was completed, and so her widower lived there alone for some time. He was offered the
Belgian throne in the house on 22 April 1831. In the 1820s plans were drawn up to demolish Marlborough House and replace it with a
terrace of similar dimensions to the two in neighbouring
Carlton House Terrace, and this idea even featured on some contemporary maps, including
Christopher and John Greenwood's large-scale London map of 1830, but the proposal was not implemented. After Leopold became King of Belgium and left Britain, Marlborough House continued to be primarily used by members of the
Royal Family,
Queen Adelaide being given the use of Marlborough House from 1831 until her death in 1849. Following Queen Adelaide's death, Queen Victoria asked Parliament to allow the Prince of Wales to live there when he turned nineteen. From May to September 1852, the Museum of Manufactures, a predecessor of the
Victoria & Albert Museum, housed its collections in Marlborough House. From 1853 to 1861
Prince Albert arranged for the building to be used by the "National Art Training School", later the
Royal College of Art. From 1861 to 1863, Sir
James Pennethorne substantially enlarged the structure by adding a range of rooms on the north side and a deep porch for the Prince and Princess of Wales, later King
Edward VII and
Queen Alexandra, who made their home the social centre of London. Their second son, the future King
George V, was born at Marlborough House in 1865, and the family lived there until
Queen Victoria died in 1901, when Edward acceded to the throne and they moved to nearby
Buckingham Palace. From the 1880s the term ‘Marlborough House Set’ came into usage to denote the Prince of Wales's fast-living social circle, which included gamblers, bankers, and other "raffish" individuals. After his father moved to Buckingham Palace in 1901, Edward VII's son George, now Prince of Wales, took up residence with his wife
Mary and their children. Mary extensively redecorated to make the home more comfortable, and was reluctant to move to
Buckingham Palace after her husband became George V in 1910. A plaque to commemorate Queen Mary was unveiled in 1967. ==Commonwealth Secretariat==