PEOPLE: owner, Harvard Business School, Boston; architect, Baker Design Group Inc., Boston; general contractor, Richard White Sons Inc., Auburndale, Mass.; mechanical, electrical, plumbing engineer, Bard, Rao + Athanas Consulting Engineers LLC, Boston; irrigation consultant, Irrigation Consulting Inc., Pepperell, Mass.; sustainability consultant, Harvard Green Campus Initiative, Boston; and waste-management consultant, Institution Recycling Network, Concord, N.H. GREEN POINTS: Throughout McCollum Hall’s renovation, the project team analyzed and implemented available materials and practices that were sustainable. The project is in a dense urban area with many amenities within walking distance. A campus-wide irrigation audit identifies efficient fixtures to reduce the volume of potable water used for irrigation. Low-flow fixtures in the restrooms are predicted to reduce water use by 47.33 percent compared with U.S. Energy Policy Act-compliant fixtures. The HVAC redesign reused the existing air handlers to serve the classrooms and existing fan-coil units to serve two of the four audiovisual closets. Two new fan-coil units serve the remaining two AV rooms. Efficient lighting reduces energy use and renewable-energy certificates offset 100 percent of the electricity use in the space for two years. Mc- Collum Hall received LEED for Commercial Interiors Gold certification from the U.S. Green Building Council, Washington, D.C.