Pavilion on the Park The new DC Southwest Library brings a sustainable and unique design to replace the previous outdated library. Needed by the community was a Library that could provide State of the Art Technology, a place for training education and work force development, and vitality. The Design Build Team engaged the community at many levels to obtain crucial feedback that informed and inspired the design solution. Comprised of a mass timber structure, this innovative building involves such elements as a world-first timber folded plate roof using Dowel Laminated Timber.