Fraser Bond are the leading lettings and property management agents for 1 New Street Square - London EC4A. 1 New Street Square is a 275,000 sq ft office building in London EC4. Deloitte London offices since 2016. Entrance to the building is on New Street Square. The building provides 275,000 sq ft of office and ancillary space over ground, upper ground and 14 office floors and will achieve the BREEAM Excellent environmental standard. The £177m office development completed in June 2016. Pre-let to Deloitte LLP more than 12 months ahead of completion. History 2016 October - Completion. 2016 February -.