Cities are defined by their skylines — while Paris is composed mostly of low-rise apartment buildings, New York is a city of tall office towers. But London is a city in transition. On Tuesday, Boris Johnson, the mayor of the British capital, attends a "topping out" ceremony for one of London's latest skyscrapers in a city where tall buildings cause a lot of controversy.
Until recently, London has been a low-rise city.
Even now, a 12-story building is considered rather tall.
But a spate of new skyscrapers is raising questions about the kind of city London should be.