From Earth 911: Keeping in line with the U.S. Postal Service’s goal to turn over a new, green leaf, the largest green roof in New York City was recently completed. Found atop the Morgan mail processing building, a 2.2 million-square-foot facility, the green roof spans nearly 2.5 acres and overlooks Midtown Manhattan. Fourteen Ipe Brazilian wood benches made from Forest Stewardship Council sustainable certified lumber are found among native plants and trees, including Calamagrostis grass on the roof.
“The Morgan green roof is the largest in New York and one of the largest in the country,” said Sam Pulcrano, vice president of Sustainability with the Postal Service. “Not only does it provide employees with a beautiful, serene outdoor environment, the green roof will help us meet our goal to reduce energy usage 30 percent by 2015.”
The rest of the article can be found at Earth 911.
I wonder if they allow visitors.
(Photo is actually Chicago's City Hall green roof)