British Land has submitted plans for a major overhaul of its 1970s Euston Tower building in London.

The developer aims to retain and re-use the existing building core and foundations at Regent’s Place, while adding new low carbon structures to create a new-look 32-storey building with bigger floor-plates.

Lendlease is carrying out pre-construction planning work on the new tower including designing the outline demolition and construction approach.

Plans drawn up by Danish architecture practice 3XN will see the building increased in size from 320,000 sq ft to 500,000 sq ft.

This will partly be achieved with extended floorplates. A new perimeter braced steel frame will support new sloping facades on the building, clad with GRC light terracotta-coloured elements to achieve a distinctive landmark on Euston Road.

British Land is targeting net zero carbon in both construction and operation. Nearly a third of the original building’s structural mass will be retained, while the developer aims to pioneer reuse and upcycling of materials.

In operation, the building will use an all-electric heating and cooling system.

Repeating units offer passive solar shading and vertical vents for natural ventilation.

The professional team includes Arup as both structural and building services consultant, with Gardiner & Theobald acting as project manager and cost consultant on the project. Lendlease is on board as construction and logistics consultant.

During the course of the 65-month project it is estimated that an average of just over 1000 construction jobs will be sustained annually on the project.

Once complete the building will be split as one third laboratory space directly above a podium retail space, with offices accounting for the remaining two-thirds of the uppermost floors.