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This 1957 mid-century modern house sits on a 1 acre lot in SW Portland with an incredible view looking east toward the river and SE Portland. The single bedroom, 2-bedroom guest house residence needed a more functional floor plan. Following designs by Giulietti/Schouten Architects, 2 bedrooms were added to an upper level addition, and the guest house was cut in half to include 1 bedroom, 1 bath, and kitchenette + entertaining space. Adding a main level addition with the existing U-shaped plan left limited options with the house’s location on a steep hillside. The existing home featured low and sleek roof lines with large, thin gables, making a second level addition a challenging design problem. Ultimately, the design retained the existing and characteristic roofs while forming a second-level addition into the existing volume.