For the Sächsische Aufbaubank (SAB) in Leipzig, ACME has developed the building cores to prioritise stairs over lifts. The usual fire escape stair void has been widened to ensure daylight on all levels. Acoustic absorption has been installed in the soffit to allow the core to remain open to the offices. The core enclosure has been cast in-situ, with precast steps and railings. To invite more use of the stair, the concrete for steps and railings has been precast and polished, making it feel more precious.