KPF has won planning for the retrofit and expansion of BT’s former headquarters near St Paul’s Cathedral.

The 1980s building, which takes up a whole city block just to the north of Paternoster Square, will be reconfigured into a mixed-use building with large, flexible office floorplates, retail and a roof garden with a restaurant.

Its massing will change considerably, with a portion of the front removed to reduce its impact on key views and new bays added stepping down from north to south creating accessible terraces.

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