Completed in 1984 by Arup Associates 1 Finsbury Avenue (1FA), the first section of the Broadgate masterplan, was widely acclaimed at the time and has since been listed as a Grade II building by Historic England. It was commonly acknowledged as having set the exemplar for future commercial architecture in the UK, introducing major innovations in construction methods and materials from the US and adopting a whole new approach to the design and planning of an office block.1FA has recently undergone a prestigious mixed-use restoration by British Land, in liaison with Historic England, designed by award-winning architects Allford Hall Monaghan Morris. While retaining the distinctive listed facade and reintroducing the original plan's full-height interior atrium, AHMM have taken a similarly innovative and experimental approach to the complex, and in doing so, have set a new exemplar for the future of office design in the 21st Century.This book sets the iconic building in its historic context, before detailing the story of its initial development, design and construction, its listing and the effect of this listing on a commercial property in terms of planning and adaptive re-use. It then critically examines the current, similarly innovative scheme and the reimagining of this late 20th-century landmark.