The London Mayor has rejected plans for a new skyscraper dubbed 'the Tulip' that would have become the second-tallest building in western Europe.
The proposed development next to the Gherkin building in central London would have stood at 1,001 feet, only 15 feet shorter than The Shard.
The City of London Corporation approved the application from Brazil's J Safra Group and Foster + Partners in April, but Sadiq Khan has now stepped in to overrule the decision.
He said the Tulip would harm the “historic environment, the wider skyline and image of London”.
“The public benefits of the scheme are limited and would not outweigh this harm," he said.
The building would have towered over the adjacent Gherkin.
Historic England chief executive, Duncan Wilson, said the building “did not justify harming London's precious and irreplaceable heritage”.
“We have long been of the opinion that this is the wrong building in the wrong place,” he added.
“We advised that its height and design - essentially a tall lift shaft with a bulge on top - would cause permanent and irreversible damage to the setting of the Tower of London.”
During the approval process the City of London Corporation said the Tulip was a “truly unique visitor attraction” that would draw visitors to the city.
The building designs featured a viewing platform with rotating pods, a restaurant and a park at street level.