A basic plan form was developed which utilised the existing stairways, conveniently sited to provide the vertical escape provision. The stairways are linked by internal streets on three levels within two lightwells, one of which is based on a remodelled existing arcade retained from the Affleck & Brown days – both the trusses and columns which support the lightwell roof are as originally found. The lightwell functions as a winter (and summer) garden, providing the means by which passive smoke extraction of the common spaces is achieved. It also creates a habitable room at the rear of the apartment spaces, enabling apartment interiors to be fully exploited and dual aspect in nature. The lightwell also serves as the means by which services are distributed.