75 London Wall, designed by Orms for Castleforge and Gamuda, aims to foster a new typology within the City of London: a retrofit led Global Headquarters.

75 London Wall, designed by Orms for Castleforge and Gamuda, aims to foster a new typology within the City of London: a retrofit led Global Headquarters building shaped by the challenges of a contemporary city. We believe that our approach to the building has forged a new way to develop, utilising latent potential to fulfil the needs of occupiers, encourage the circular economy and enhance the City.
The design follows a rigorous approach of ‘growing the building’, to embed ideas from the city whilst working to compliment the elegance of the existing building. This ‘ultrapractical’ approach has helped create a variety of layered loggia and balcony spaces elevating the office environment and promoting well-being as well as providing humanity and scale to the existing building, whilst will retaining 88.5% of the existing built fabric.
On the ground floor, we have created a cultural forum; a venue for performance and public speaking, aligning the building with the City of London’s Destination City strategy. A new public space focused, ’Prior’s Garden’, will create an area of greenery on the enhanced pedestrian route that links to Austin Friars by a historic city passageway. Our basement has been re-purposed into a ground breaking wellness hub, containing social spaces, studios, gyms, saunas and consultation rooms.
By setting wide-reaching sustainability goals and embracing a rigorous design approach focused on retrofitting, we aim to not just transform a building, but to enrich the urban fabric, enhance occupant experience, and contribute meaningfully to the vibrant tapestry of the Square Mile.

Circularity must be at the heart of a sustainable future for the city of London. Not only does our city demand sustainable material choices, but it also requires innovative use of these materials as we tackle the challenge of retrofitting buildings in an efficient and elegant manner.
At 75 London Wall, we are carefully deconstructing hand-laid limestone cladding from the existing façades on the upper levels, meticulously assessing, cleaning, and reintegrating the stone into the new design, ensuring that design subtleties and technical rigour are embedded in the project. Crucially, the stone is being reused as originally intended—hand-laid—preserving the integrity of its craftsmanship and maintaining the cycle of circularity moving forward.
This ultrapractical approach reflects our commitment to sustainable architecture and innovative material reuse in response to today’s environmental challenges.
Andrew McEwan, Associate Director at Orms