IRS Building (cont'd) green, full of conservation features like xeriscaping out front, energy-efficient heating and cooling, tons of natural light from ample windows and low-water- use plumbing. There's a shower to encourage riding a bike to work and preferred parking for hybrids. And almost half of the 30,000 square feet of shelving was recycled from an IRS center in Philadelphia, saving $1.2 million. A favorite feature for Paul Mamo, submission processing field director, and Elise Ipson, who was the IRS project manager for the move, is the lighting, which is activated by motion sensors. In the warehouse where the re- :ords are kept in long rows jf shelves, it's lights-out ifter three minutes if noth- ng moves. In the office irea, 15 minutes without ctivity will shut off lights. Taxpayers are expected :> save a lot of money over le lifetime of the building, lamo said, although exact imbers weren't available. 114