The Stock Exchange Tower is a high-rise building located in the City of London at 125 Old Broad Street. Standing at 103 metres (338 ft) tall, with 26 floors, the tower was completed in 1970. It served as the headquarters and offices for the London Stock Exchange until its departure for new premises in Paternoster Square, in July 2004. Face to face trading was conducted on the trading floor of the exchange, until it was abolished in favour of electronic trading in the 1986 deregulation of the London Stock Exchange known as Big Bang.
The building is currently undergoing a major renovation which will see its façade reclad in glass and steel, and thousands of square metres more office space created.