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The Durst Organization operates the building and rents the space. According to the Durst Organization, the green design elements make the building an appealing place to rent as well as a financially sound investment. As an example, they cite the energy efficiency of the building shell. Through the use of low-e glazing, the admission of daylight for task lighting is optimized, while the passage of heat is significantly reduced; thus building cooing costs are lower and comfort levels are higher.
Another major step in reducing electrical usage was the selection of gas-fired absorption chillers as the primary building cooling units. The design called for the chillers to be located in a large, high-bay mechanical room neat the top of the building. The location high in the building reduced the amount of otherwise rentable space needed for exhaust piping and puts the chillers in proximity to the rooftop cooling tower, thus reducing piping and pumping costs.
The units selected were six Trane Horizon™ two-stage direct-fired absorption chillers, rated at 620 tons each for a total of 3,720 tons.
The Horizon chillers are modular in design, and readily separable into three individual components. This simplified the installation of the units in the penthouse mechanical room. All of the components were lifted into position from street level by crane while the building was under construction in 1998.
Finally, the building also features two 200 kW fuel cells, which provide electric power to the building grid around the clock.
“This was a complex project, and some of the ‘green’ features had never been used on such a large scale, so we had some adjustments to make,” said property manager Jim West. “But we’re definitely pleased with the results, and our occupancy levels suggest that we’re providing an atmosphere that tenants appreciate. We have inquiries and visitors from around the world to see what a high-performance building is all about.”
Publication date: 07/28/2003