Aroland Holdings, advised by Perennial Holdings, Stanhope and Eric Parry Architects have unveiled plans to deliver the tallest tower in the City of London.
The 309.6m One London tower will be the joint tallest building in Western Europe on completion in 2033. Construction of the £1bn+ scheme will commence in 2028 and on completion the scheme, which was formerly known as 1 Undershaft, will provide 1.2m sq ft of office-led space.
The scheme, which sits at the junction of Leadenhall Street and St Mary Axe, achieved full planning consent from the City of London Corporation in December 2025. Deconstruction of the existing building, St Helen’s Tower, is already underway with a main contractor appointment expected later this year.
Pua Seck Guan, chairman and CEO of Perennial Holdings, said: “One London symbolises our commitment to delivering buildings of international significance that will leave a lasting legacy. The name captures what this building truly is: the defining address of a city like no other. This landmark development will enhance London’s position as a global business capital.
“Alongside London’s leading development manager and a globally renowned architect, One London goes beyond traditional office space to create a unique destination that prioritises wellbeing, sustainability and community integration. We are proud to be delivering this transformative and era-defining project that will serve as a beacon for the future of urban development.”
David Camp, CEO of Stanhope, added: “One London will be a striking addition to the capital’s skyline and serve as a symbol of its enduring global pre-eminence. With London office take-up at its strongest level since 2019, 70 of 98 major deals last year involving expansion, and vacancy for new City core space at just 0.3%, the case for delivering the next generation of globally competitive workspace has rarely been clearer.
“London is not short of offices in general. It is short of the very best offices that help businesses attract talent, collaborate and grow. Delivering elegant buildings that redefine how we think about the workplace, and that are woven into the fabric of London, its occupiers, businesses and communities, has been the foundation of our 35-year track record of delivering pioneering and ambitious developments.”
Eric Parry CBE, founder of Eric Parry Architects, said: “One London stands as an icon at the centre of a great city with a confident future in its global role and outreach. London has evolved around the ‘Square Mile’, essentially the Roman city, over the last 2,000 years, adding with each historical twist and turn layers of building and conversation of every period since. We stand at an historic moment of physical metamorphosis as the City rises in a uniquely close and tall form, at the centre of which is One London.
“From the outset, my conviction has been that the summit of a building like this should be a civic space, not a corporate one. This is not just another tall building. It has multiple horizons to respond to: the street, the public garden at Level 11, amenity floors with external terraces at Levels 30 and 48, London Museum’s classrooms at Level 72 and an unparalleled public viewing gallery at Level 73. Most importantly, it is a new building with fine proportions: a white body that creates a protective carapace to moderate solar gain as part of the super efficient, sustainable energy design. This is a pioneering model for a tall building: commercial in its purpose, generous in its spirit.”
Newmark has been appointed as leasing adviser for One London.
