In 1912 the Colman family rebuilt the mansion called Great Burgh, over the Reigate Road from Nork House. This neo-Georgian house is now a Grade II listed building. It was used as a research establishment by the Distillers Company, then by British Petroleum and Beecham Pharmaceuticals, and later as offices and accommodation by Toyota, who have their UK headquarters here. Since 2016, the original building has been occupied by the Science Group and their subsidiary Leatherhead Food Research. The house's architect Ernest Newton also designed the formal gardens and parterres.