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Economic growth and new development are creating both opportunities and challenges to maintain, restore and create parks, trails, and urban forest lands. Casey Trees' research of the benefits of trees in urban areas as well as the mission to restore, enhance, and protect the tree canopy in Washington, D.C., is driving the concept of creating "functional open space." Using the findings of this research showing the values of trees and green space in an urban environment and applying the suitability modeling capabilities of ArcGIS Spatial Analyst extension's ModelBuilder, Casey Trees is evaluating the opportunities for maintaining, restoring, and creating green space in Washington, D.C. The purpose is to enhance the ecological, economic, and health and safety values of these urban areas. A case study will be presented to illustrate the use of this tool in guiding the future of green and open space in the Anacostia River Watershed.