A 5,000 SF subdivided lot in downtown Arlington, Va. The goal is to create an affordable three-bedroom house that will be a practical example of sustainable living in a dense suburban neighborhood. First, hold tightly to the required setbacks at the lot edges, and reach upward for open space by creating a generous roof deck and a third story studio. The side walls of the house roll upwards and transform into roofs at the garage and the south-facing high roof, which provides space for solar hot water panels and future photovoltaics. The street façade balances the desire for south light with the need for privacy from the dense neighborhood by utilizing sliding screen walls that can shade the screen porch in the day or the front windows at night. The house shows the possibilities for increasing density in our older suburban neighborhoods while still being a good neighbor.