LEED BD+C: New Construction v2 - LEED 2.2
Lorry I. Lokey Graduate School of Business
LEED Gold 2010
The below stakeholder perspectives address the following LEED credits:
WEc1.1, WEc3.1, WEc3.2, EAc1, EQc2, EQc6.2, EQc7.1, EQc7.2
Goals and motivations
What were the top overarching goals and objectives?
This project's leading sustainability goals focused on water use reduction and recycling, energy conservation and conserving material resources. The major systems employed to achieve these goals include rainwater harvesting, non-potable irrigation, high efficiency plumbing as well as natural ventilation supplemented by displacement air, ample daylighting and solar shading. The integration of these systems support a self-aware learning environment that is dedicated to conserving resources and confirming the school's commitment to socially responsible business' triple bottom line: "people, planet, and profit".
The Lokey Graduate School of Business at Mills College joins modernism with innovative sustainable technologies in a historical campus setting. The LEED Gold design exemplifies the school’s core values: entrepreneurial leadership, collaboration, and social responsibility. The seamless integration of sustainable design inspires innovation while providing measurable energy cost savings.
What were the most notable strategies used to earn LEED credits?
Living green roof
The feature example of the team's integrative approach is a highly visible green roof directly above the indoor/outdoor porch element. While the deep porch provides essential shading benefits, it also offers real estate for a green roof. Not only does it serve as a clearly visible example of the building's sustainability goals for users and visitors, it also reduces the heat island effect for adjacent offices; saves on roof material replacement over the building's lifecycle; provides a natural habitat for local flora and fauna; and serves as essential glare control for nearby occupants.
Photo by Nic Lehoux. The building’s feature example is a highly-visible green roof directly above the indoor/outdoor porch element. While the deep porch provides essential shading benefits, it also provides real estate for the green roof.
Dual-flush water closets (1.6 gpf solids; 1.1 gpf liquids), one-eighth gpf urinals, 0.5 gpm lavatory faucets, and a rainwater catchment system resulted in an 80.1% reduction in indoor water use. The rainwater catchment system captures rainwater from the roof and stores it in a 4,000-gallon underground cistern. This water is filtered, UV treated, and used to flush toilets.
Conserved outdoor green space was planted with drought-tolerant, native meadow grass that requires less mowing and water than traditional campus lawns. Native plantings and trees minimize irrigation needs; in summer months, the nearby campus lake offers a 100% non-potable water source. Vegetated swales divert and filter rainwater before it enters municipal stormwater pipes.
Photo by Bohlin Cywinski Jackson. The front of the building features a visible roof scupper that empties into a water retention pond. This water is filtered and allowed to settle prior to being released to the municipal stormwater system.
Low-tech solutions were supplemented with high-tech controls. The building was oriented to maximize solar exposure during the winter while a deep indoor/outdoor porch and sunshades shield from heat gain during summer months. Natural ventilation with occupant-controlled windows and sensor-controlled clerestory windows are complemented by a displacement ventilation system, high ceilings, and radiant-heated concrete floors. These systems are tied to the building's information controls for optimal user comfort. Low-E glazing, exterior sunshades, and ample daylight from the large ratio of glazing is used to illuminate 100% of the occupied interior spaces, while occupancy sensors reduce heat gain. 90% of the occupied spaces also have access to views of the historical campus landscape. Radiant heated flooring, sensor controlled operable windows, Low-E insulated glazing, and solar shading devices contribute an actual energy reduction below baseline use of 40% gas and 45% electricity. The large ratio of glazing illuminates 100% of the occupied interior spaces while reducing heat gain.
Materials reduction and indoor air quality
The project team selected materials composed of low-emitting VOCs and high recycled content. Polished concrete radiant flooring provided a lasting floor finish and an efficient way to heat and pre-cool the building. The concrete floor also eliminates the need to install and maintain off-gassing flooring products and adhesives. Restroom, break, and credenza countertops were made of 100% post-consumer and post-industrial recycled fibers, including cardboard, newsprint, retired U.S. currency, and other paper. All acoustic fabric panels were woven from 100% recycled polyester reclaimed from post-consumer plastic soda bottles. A Montezuma cypress tree removed from the site was creatively milled and repurposed into tables and benches in the informal break-out areas. Finally, palm wood used in casework was manufactured without added formaldehyde from reclaimed plantation grown palms beyond their fruit-bearing years.
Aside from LEED certification, what do you consider key project successes?
The Lokey Graduate School Building has been featured in GreenSource Magazine and has won four regional and national awards. The greatest success of this project has been the exceptionally positive reception by faculty, MBA candidates, and the campus community. Feedback has reaffirmed the sustainable design goals, including flexibility of users to adapt to sustainable features. The classrooms and public venue spaces in the building are highly sought after for the program's curriculum, lectures, college events, and outside community functions. The program's enrollment has increased significantly since completion of the new building, which the former founding Dean Nancy Thornborrow attributed as "the building effect."
Photo by Bohlin Cywinski Jackson. Ample daylight not only reduces the need for artificial lighting, but also improves occupant comfort. Views to the exterior also strengthen the quality of interior spaces for academic functions.
Another key success is that the building has exceeded electrical energy use reduction goals. The M&V process identified necessary adjustments that enabled performance improvements. For example, gas consumption has been reduced after determining that the hot water supply was operated above the design set point, and air handler energy savings have been realized after lowering supply air temperature and turning on handlers later.
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