The £400m tower designed by Ken Shuttleworth’s Make practice will rise to 36 floors making it slightly taller than the Gherkin.
Under present plans work could start on the 183m tall tower as early as June 2018.
Brookfield Property Partners is also building an office block at 100 Bishopsgate, using its in-house contractor Multiplex to deliver the tower.
The building at 1 Leadenhall will have 540,000 sq ft of office space, as well as 50,000 sq ft of shops and cafes on the ground, first and second floors. Also it will boast a public galley with views over Leadenhall Market.
The existing seven-storey building on the 1 Leadenhall site, known as Leadenhall Court will be demolished over a six month programme.