The Building
Formerly a 24 story office building called One Angel Court, constructed in 1979. It's being completely revamped. The octagonal tower is being stripped to its core, re-clad with glass, an extra floor is being squeezed in, and some low rise buildings are being added around the base - complete with roof gardens. Apparently it's in a conservation area, so if they demolished they would only get planning permission for an 11 floor replacement. Keeping the core means they can...
Angel Court (Bank) Crane, London, November 2015