The scheme, designed by Woods Bagot, will replace a 1930s office block with around 21,830 square metres of office space, alongside retail and cultural uses.

A publicly accessible events space will sit on the 29th floor, offering a 270-degree terrace with views across the capital.

Located within the Leadenhall Market Conservation Area, the tower will rise next to the Grade II-listed Leadenhall Market and incorporate archaeological remains of London’s first Roman Basilica, which will be displayed in situ at basement level.

The building has been designed to achieve a BREEAM Outstanding rating and will be fully electric.

It includes energy-efficient mechanical systems, a high-performance facade, and natural ventilation strategies aimed at reducing operational carbon.

According to planning documents, the facade will be constructed using a unitised curtain wall system with external shading devices to limit solar gain.

Stone and precast concrete will be used on the lower levels to complement the historic surroundings, while the upper floors will feature glazed curtain walling with deep reveals and vertical mullions for solar control.

Urban greening forms a key part of the design, with planning documents detailing biodiversity roofs, landscaped terraces, and greened colonnades along Gracechurch Street.

A total of 440 cycle parking spaces—400 for occupants and 40 for visitors—will be provided along with basement-level showers, lockers and drying rooms.

Planning documents also confirm that construction will involve deep excavation and a top-down construction method, using a secant piled retaining wall system.

A just-in-time logistics strategy and pre-fabricated elements will be employed to minimise disruption and reduce emissions on the constrained city-centre site.

Public realm improvements designed in collaboration with Publica include the reinstatement of a pedestrian link between Gracechurch Street and Lime Street Passage.

This will be supported by new granite paving, trees, seating and improved lighting.

The project is targeting completion in 2030, with Mace currently in the pre-construction services agreement (PCSA) phase.

The procurement route and contract value have not been disclosed.

Ged Simmonds, managing director private sector at Mace Construct, said the scheme was “a unique opportunity to deliver a sustainable and forward-thinking office” while responding to “its historic context”.

Hertshten Properties UK chief executive Ron Hertshten said the tower would “set a new benchmark for sustainable office space in the City”.

The planning application was approved by the City of London Corporation in October 2023.

Source: Mace press release

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