The recently renovated Koll Airport Professional Center in Irvine, CA received a LEED Silver Certificate in 2009 from the U.S. Green Building Council for Core and Shell. In fact, the building is considered one of the nation’s very first LEED-certified office condominiums. The remarkable transformation of a run-down, two-story, 63,225 square-foot office and warehouse into an eye-catching, single story, energy-efficient, 40,000 square foot office building is the subject of much admiration in Southern California. After removing the second story from the original building, the architects split the lower level into two almost completely separated buildings, added more windows for better daylighting and created two new inviting entryways that provide access to a wide variety of office spaces.