Beacon Capital's 1211 Avenue of the Americas (on Sixth Avenue between West 47th and 48th Streets) recently earned LEED-EB Silver certification from USGBC. The 45-story, two million-square-foot tower is the largest building that has been certified to date under the LEED for Existing Buildings rating system (it's unclear to us whether the project sought certification under LEED-EB Version 2.0 or Existing Buildings: Operations and Maintenance- we'll clarify in the comments if possible). Specific green features incorporated into the retrofit include efficient and reduced-content mercury lighting, low-flow plumbing fixtures, and new glazing that boosts the amount of daylight that reaches the tower's interiors. 1211 Avenue of the Americas earned BOMA's "Best Operating Office Building" award in 2008 for buildings larger than one million square feet; current tenants include the New York Post, Fox News Channel, and the Fox Business Network.