Fraser Bond are the leading lettings and property management agents for Sixty London - London EC1A. Sixty London at 60 Holborn Viaduct is a 210,000 sq ft office building in Holborn, London EC1. Amazon's head office in London is in this building. 60 Holborn Viaduct is the first of AXA Real Estate's developments in the UK on behalf of its dedicated development fund, DVIII. The BREEAM Excellent building has been designed by international architects KPF. Occupiers at Sixty London: - Amazon moved in at the end of 2013. 205,800 sq ft accommodates over 1,600 people.