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A striking multi-story lobby features fluid, instrument-inspired curved walls designed by Snøhetta.

A sculptural spiral stair rises through the atrium before unfolding into a series of balconies, turning circulation into the architectural centerpiece of the new front-of-house spaces.

The 2,150-seat auditorium has been carefully restored from its ceiling plasterwork through to its new seating, retaining the character of the historic performance space.

The new entrance, with its inclined planes and arched openings, translates the spatial language of historic concert halls into a contemporary civic threshold.

The new addition establishes a contemporary counterpart to Powell Hall through angled masonry planes, arched openings and expansive glazing, creating a distinct architectural identity without replicating the historic building.

The Powell Hall Renovation and Expansion in St Louis, MO, restores the 1925 concert hall while adding 64,000 square feet of contemporary performance, rehearsal, education and community space.

Wellness is woven into the workplace through quieter environments for meditation and moments of stillness. These spaces offer employees a change of pace within the larger, more active headquarters.

The employee floors include dedicated spaces for relaxation and self-care, giving people somewhere to step away from the pace of the working day and recharge.

Repeated across the interiors, the geometric grid helps break up large surfaces while adding a distinctive graphic quality. Its form draws from the visual language developed from Aon's logo.

Social areas are distributed across the employee floors to encourage movement through the building. The arrangement supports encounters, exchanges and creative cross-pollination around the central core.