The property then devolved upon another cousin, William Berkeley (d.1737) of Pylle, Somerset, who also took the surname Portman in lieu of his patronymic.
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He had acquired land in Marylebone, London, which - through the later housing developments of Henry William Portman, who turned it into the Portman Estate - is still the base of the Portman family wealth.
Horatio Nelson, 1st Viscount Nelson | Viscount | Natalie Portman | Vickers Viscount | Bernard Montgomery, 1st Viscount Montgomery of Alamein | William Howe, 5th Viscount Howe | viscount | Garnet Wolseley, 1st Viscount Wolseley | Charles Lyttelton, 10th Viscount Cobham | William Slim, 1st Viscount Slim | Edmund Allenby, 1st Viscount Allenby | William Lamb, 2nd Viscount Melbourne | Julian Byng, 1st Viscount Byng of Vimy | Alan Brooke, 1st Viscount Alanbrooke | William Waldorf Astor, 1st Viscount Astor | James Bryce, 1st Viscount Bryce | Henry St John, 1st Viscount Bolingbroke | Henry John Temple, 3rd Viscount Palmerston | Edward Grey, 1st Viscount Grey of Fallodon | Charles Bathurst, 1st Viscount Bledisloe | Walter Runciman, 1st Viscount Runciman of Doxford | Viscount Falkland | Samuel Hood, 1st Viscount Hood | John Anderson, 1st Viscount Waverley | James Craig, 1st Viscount Craigavon | William Beresford, 1st Viscount Beresford | William Barrington, 2nd Viscount Barrington | Stapleton Cotton, 1st Viscount Combermere | Rowland Hill, 1st Viscount Hill | Marcus Samuel, 1st Viscount Bearsted |
He was the son of Viscount Portman and Lady Emma Lascelles and was educated at Durham University in England.
Sir William Portman had acquired land in Marylebone, London, which through the later housing developments of Henry William Portman became the Portman Estate, which today is one of Central London's largest landlords and is still the basis of the wealth of the Portman family.