Tower 42 was built as the HQ of the National Westminster bank, and was originally known as the 'NatWest Tower'. Designed by Richard Seifert, it was opened in 1980 after nearly a decade of building, and was among the most expensive offices (per square metre) ever built. At 600ft (183m), it ended the Post Office Tower's reign as the tallest building in the UK, but was itself overtaken with the completion of the 800ft One Canada Square tower (also known as the Canary Wharf Tower) in docklands in 1990.
One of the interesting features is that the cross section resembled the NatWest logo - not that anyone can see it, except from a helicopter. The building is actually cantilevered from a central concrete core, allowing other buildings to remain at ground level. It was badly damaged by the Bishopsgate bombing of the IRA in 1993, and had to be extensively refurbished. The NatWest bank decided then to sell the tower, which is now in use by a variety of companies. There are restaurants on the 24th and 42nd floors. read more