While raw undeveloped land in the SRR area may be a good value (relatively cheap!) for the developer, it's not such a great deal for the taxpayer. When that office building or housing development on 1/2 acre lots is built in the SRR, the taxpayer picks up the tab for much of the road, school, environmental, etc., costs. The proffers simply don't cover all the costs incurred, particularly long-term costs. Revitalizing the more downtrodden areas can be a net gain for taxpayers, as the road and service costs are lower and taxes are higher on the newer, more opulent buildings. Not to mention the benefits of a revitalized area where each new project will encourage others to jump in with their best effort.
It all works together as pieces of a puzzle. We need the green areas and the concrete areas. If we do this thing right, we can keep taxes low, quality of life high, and this county can be the jewel of the Washington, D.C. area.