Dorfman is a minority shareholder in The Office Group, the British pioneers of co-working spaces. He was previously chairman and majority shareholder of the company from 2010 to 2017, before a £500 mn deal with Blackstone in June 2017. The Group has over 30 buildings across central London. Its clients include thousands of small businesses and start-ups as well as larger companies. In 2014, he co-founded and became chairman of Doddle, a Retail Business enabling people to collect, return and send their online shopping from train stations and elsewhere. Dorfman is also a lead investor and board member of the London Theatre Company.