Old Rockefeller Center Christmas trees never really die, they just get built into Habitat for Humanity homes. Boards made from the festive trees are hidden bits of ‘holiday’ spirit built into homes from Philadelphia to Mississippi. The Rockefeller Center Christmas tree keeps giving long after the towering spruce is taken down. Every year after the holidays, the iconic tree is milled into wooden planks for use in Habitat for Humanity homes. Wood from last year’s tree is now being used in homes in Newburgh, New York, 50 miles upriver from Rockefeller Center.