Saturday August 29th from 10:30-11am Portland Central Library is offering an Eco-Roof Tour at 801 SW 10th Avenue. In 2008, Multnomah County's Central Library became the first library in Oregon to feature an eco-roof. Constructed with living plants and simulating the processes that occur in nature, eco-roofs (also known as green roofs) absorb rain water like a meadow in a natural setting.The Central Library eco-roof provides a unique opportunity to showcase sustainable green roof technology in the context of a beloved historic landmark.