The Gherkin is a perfect example actually. Same location (five minute walk) and although it's a tremendously ugly building, it's become a bit of an icon now.
Someone just mentioned about more space on the upper floors and it made me envision the argument that the building perfectly embodies capitalist classism.
The gherkin looks alright IMO... though I guess is the opposite to the walkie talkie in that the gherkin uses floor space very inefficiently by being both round(ish) and progressively narrower
still it looks good and has a nice bar at the top