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The building is predominantly masonry construction. Floors are either reinforced concrete or timber on steel beams and cast-iron columns. Converting the basement into a carpark necessitated excavation of the courtyard and replacing perimeter brick piers with steel picture frames which redistribute loads to the existing foundations. The new courtyard floor is supported by five steel columns. Precast concrete slabs span between steel beams, overlaid with reinforcement and an in-situ slab.