The building is clad in 9,600 tonnes of Derbyshire sandstone with bronze ventilation fins. Inside, the floors are linked by custom glass lifts and a 210 m helical bronze "ramp", which dominates the interior of the building. The cores of the building are on the outside, to create a single open-plan space inside. Express lifts take visitors from the lobby, a self-supporting "vortex" of three curved timber shells, to the double-height pantry on the sixth floor, with view of St Paul's Cathedral. Then visitors must take a second lift or use the ramp to access other floors. The building houses 4,000 staff, with room to expand. All desks are electric adjustable-height.

In July 2018, the RIBA announced that Bloomberg London had made the shortlist of the 2018 Stirling Prize along with Bushey Cemetery, Chadwick Hall, the new build at Tate St Ives, Storey's Field Centre and Eddington Nursery and the Sultan Nazrin Shah Centre. In October 2018 it was announced as the overall winner.

The building is noted for its energy-efficiency. It achieved a 98.5% score against the BREEAM sustainability assessment method, the highest design-stage score ever achieved by any major office development. Rainwater is collected from the roof to supply the vacuum toilets. The office floors are illuminated with 500,000 LEDs. The ceilings are custom aluminium "petals", inspired by the pressed metal ceilings of New York, which act as light diffusers, cooling elements and acoustic attenuation.

Ashford provided management services on the project, Inclusive of Water Treatment, commissioning validation & witnessing.