Fraser Bond are the leading lettings and property management agents for 55 Wells Street - London W1A. 55 Wells Street (formerly Tasman House) is an office building in Fitzrovia, London W1. Typical floors of 5,140 sq ft (478m2). Double height reception. Terraces on first, sixth and shared rooftop terrace. History 2017 November - The development completes replacing a dilapidated 1960s office building with a new six-storey building providing Grade A office accommodation above the ground floor retail and restaurant space. 2015 September 25 - Planning permission granted for: demolition of existing.