It contains enough steel to go round the world twice – and even has a fake breeze to flutter the stars-and-stripes flag in its lobby. If this colossus is just the first of a new breed of bulky supertalls, is Britain next?

Among the slender needles and elegant spires of the Manhattan skyline, a mountainous lump has reared into view. It galumphs its way up above the others, climbing in bulky steps with the look of several towers strapped together, forming a dark, looming mass. From some angles it forms the silhouette of a hulking bar chart. From others, it glowers like a coffin, ready to swallow the dainty Chrysler building that trembles in its shadow. It is New York’s final boss, a brawny, bronzed behemoth that now lords it over the city with a brutish swagger.

Fittingly, this is the new global headquarters of JP Morgan, the world’s biggest bank. The firm enjoys a market capitalisation of $855bn (£645bn), more than Bank of America, Wells Fargo and Citigroup’s combined, and it looks as if it might have swallowed all three inside its tinted glass envelope. Last year, for the first time, it made more than $1bn a week in profits. Chairman and chief executive Jamie Dimon likes to boast of its “fortress balance sheet”, and he now has an actual fortress to go with it – built at a cost, he revealed at the opening, of around $4bn. He has certainly made his mark. It would be hard to design a more menacing building if you tried.