The following paper presents a series of experimental and numerical vibration assessments completed on the long-span floor system of Fast+Epp’s home office. Measurements were taken on the building throughout different stages of construction to understand the impact of non-structural elements on floor vibration. Factors considered are partitions, concrete toppings, and screws between the glulam beam and CLT topping. Finite element models are also created for the structure, and predictions from these numerical models are compared to experimental data.The model used simplified models, similar to those practicing designer would make, and several parameters in these are varied to understand their impact on vibration. It was found that non-structural elements had a significant effect on the vibration performance of the system, changing both the fundamental frequency and reducing the overall accelerations.