Upward view of the ceiling soffit in the second-floor expansion room above the office at the Hoffmann-Hayman factory, photographed on 1 February 2023 — the building's 1930s pan-formed reinforced-concrete joist floor system shown left honestly exposed with no suspended ceiling: flat-soffit concrete joists (ribs) run in parallel across the room with board-formwork grain pressed into their vertical sides from the wood-plank forms they were cast against, and the bays between the joists carry the characteristic ribbed soffit pattern left by removable corrugated-steel pan forms that were set between the joist forms, poured over, and stripped out after curing; on the flat face of the nearest joist a cursive graphite-pencil inscription reads 'AGOSTO 8 - 56' (August 8, 1956), a fourth dated pencil mark by the same hand or cohort as the three 'Marzo' 1952–54 dates on the east wall of the same room, and a thin black signal cable runs horizontally across just below the joist
