He also owned Trent Park and hired Philip Tilden to largely rebuild that mansion located in Cockfosters. Stylistic differences between the two houses illustrate changes in taste among members of British high society of the period. Trent Park possessed a landscape designed by Humphrey Repton but the existing house was Victorian and undistinguished. Sassoon had the Victorian additions demolished or altered, except for the west service wing, between 1926 and 1931. The projecting wings were added to the entrance (south) front. These modifications led to a large mansion in early Georgian-style. It became one of the houses of the age according to one report, "a dream of another world – the white-coated footmen serving endless courses of rich but delicious food, the Duke of York coming in from golf... Winston Churchill arguing over the teacups with George Bernard Shaw, Lord Balfour dozing in an armchair, Rex Whistler absorbed in his painting... while Philip himself flitted from group to group, an alert, watchful, influential but unobtrusive stage director – all set against a background of mingled luxury, simplicity and informality, brilliantly contrived..."