In December 2005, the Village of Oak Park began construction on what will be the first LEED certified public works facility in the state of Illinois. Completed in September of 2007, the $26 million facility maintains an array of environmentally friendly features and systems, and is presently in the process of acquiring LEED Gold Certified rating from the U.S. Green Building Council. Green materials of the building include low-emission paints, adhesives, coatings, sealants and carpeting, while energy features include taking advantage of large windows for passive solar heat and installing an ultra-efficient HVAC system. What is more, the top of the building will be outfitted with a green roof.