On the death of his father in August 1909, in accordance with his father's will, Hordern took over management of the family company, which employed more than 4,000 people in its store and mail-order business and imported, manufactured and sold a vast range of merchandise. In 1910, Hordern purchased the 1837 Darling Point mansion, Mount Adelaide, from the family of
Henry Mort, and commissioned architects Morrow & De Putron to design and build a Federation Arts & Crafts mansion, which he named
Babworth House and which became his family's primary residence from 1915 until his death in 1956. Hordern publicly listed the company in 1912 and restructured it in 1920. Hordern retired from the business in 1926, when he sold it to a
public limited liability company for the sum of
AU£2,900,000, described at the time as the "largest business sale that has ever taken place in the history of Australia". ==Later career and philanthropy==