Calle 20 is a multifamily building located in the district of San Borja, Lima Peru. In this project, the goal was to implement the greatest amount of sustainable measures. One of the most innovation measures included the use of materials with recycled content and regional origin, use-free areas common including landscaping and spaces for bicycles and low emission vehicles. This building is one of the first projects to certify LEED in San Borja and one of the first residential LEED in Peru.