The U.S. Green Building Council (USGBC) held the first public comment period on LEED for Existing Buildings (High Performance Operations) from August 2 to September 2. It received more than 650 comments, which were used to help refine the rating system where appropriate. USGBC is now inviting the public to participate in the second public comment period for that rating system, open for 14 days, from September 24 to October 8, 2007 (closing at midnight Pacific daylight time).
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