Cooling and heating a building of this size is often a momentous undertaking and extremely energy intensive. The main reason for this is that these buildings are primarily made up of tenant space. Tenant spaces are often provided as core and shell type spaces with minimal interior partitions and equipment. Loads are added after the building and its major HVAC systems are completed and they are often vary widely based on the tenant type.
The magnitudes for both the heating and cooling costs are relative to what is expected for buildings of this type. The heating cost would actually be lower than what is calculated because of the "Free" heat rejected from the Fuel cells during their operation. The cooling costs are also lower than what would be derived from the assumed values because the units used to condition the tenant spaces have a higher SEER of 15 than what was provided as assumed.
This building would be very difficult to calculate loads and other models from for several reasons:
Use of ultra clear glass allows for large solar loading
Sun path and solar loading is affected by shadows cast by other buildings adjacent to site.
Building is out fit as tenant core and shell spaces so many assumptions would have to be made about tenant loading
Static pressure differentials would have to be maintained in all exit stairwells in the event of an emergency. Creating distribution and load calculations for these tall narrow spaces would be difficult
Many custom made calculations would have to be created to fit the unique conditions of this site. Overall the calcuations involved would be very intense, and their accuracy would be questionable.