This study investigates the influence of non-structural walls and suspended ceilings on vertical floor acceleration demands under near‑fault seismic excitation. Using a suite of 65 historical vertical ground motions exceeding 0.25 g, a linear time‑history analyses on various configurations including bare frame, full frame, masonry‑only, and curtain‑wall‑only models is performed to quantify floor amplification ratios (PFAv/PGAv). Pronounced local amplification is observed when masonry infills are stacked on lower stories, with mid‑floor peaks surpassing 3.6 × PGAᵥ, whereas curtain walls yield more uniform responses. Roof levels exhibit moderate amplification (3.0÷3.5 × PGAᵥ) across all cases. Node‑specific variability up to 100% on same floor level underscores the impact of irregular infill distribution. Suspended ceilings, modelled as tension‑only links, show up to 20% higher vertical demands compared to their supporting floor.

To facilitate estimation of vertical demands in this study, simplified predictive tools are proposed: (1) a global baseline vertical amplification factor for non-structural walls, refined by configuration‑ and floor‑dependent local multipliers to capture infill effects; and (2) a ratio‑based method to estimate suspended‑ceiling accelerations relative to their supporting floor.