P & O Building, 122 Leadenhall Street, City of London, undergoing demolition from the bottom upwards to make way for a taller tower designed by Sir Richard Rogers

NOTES: This tension structure with a compressed concrete core was originally designed as a pair with 1 the Undershaft, the current Aviva building which still stands, by the architects Gollins Melvin Ward & Partners. On completion, it was considered one of the most complex glass fronted buildings in the UK.