81 Newgate Street is a 10-storey office building on Newgate Street in the City of London, opposite St Paul's tube station. It opened in its current state in June 1984. Prior to the departure of the BT Group in December 2021, it was best known as the BT Centre, having been the global headquarters and registered office of the group since its opening in it…81 Newgate Street is a 10-storey office building on Newgate Street in the City of London, opposite St Paul's tube station. It opened in its current state in June 1984. Prior to the departure of the BT Group in December 2021, it was best known as the BT Centre, having been the global headquarters and registered office of the group since its opening in its current state in 1984. It had been home to BT and its predecessors, including the General Post Office, for more than a century.