Fraser Bond are the leading lettings and property management agents for Southwark Over Station Development - London SE1. Southwark Over Station Development (OSD) is one of the most sustainable large-scale office schemes in the United Kingdom over Southwark Tube station in London SE1. New Office and Retail Space The 17-storey hybrid timber building has been designed by Allford Hall Monaghan Morris and offers c. 26,500m2 of commercial office space alongside more than 230m2 of retail space on the ground floor. It will also include more than 2,650m2 of affordable workspace offered at a discount to the market. The.