The main whole-building energy model developed in the preliminary design phase contains 247 zones to account for the loads in every typical space. This level of modeling is indicative of the attention to detail required by the absolute energy goals. It quickly became clear- that accurate assumptions about the data center energy use and miscellaneous plug and process loads would be at least as important as the thermal modeling. Early modeling substantiation showed server electricity use representing one-third of the building's total annual energy consumption and miscellaneous plug loads another 23%. Energy use by office and exercise equipment, audiovisual equipment in the telepresence room, the security system, elevators, the fire alarm system, and even a coffee cart was carefully tabulated and included. Eventually exit lighting, sump pump energy, and parasitic losses in the lighting panels would all be incorporated. Occupancy and equipment schedules were repeatedly updated to reflect owner modifications. The eventual plug load density, including a constant 0.35 W/ft2 demand by the data center, was modeled to be 0.85 W/ft2 during occupied hours and 0.54 W/ft2 during unoccupied hours (Lobato et al. 2010).