In Oregon’s rugged landscape, “unbuildable” is a challenge. Visionary architect Robert Oshatz embraced that challenge to create a marvel. In the late 1980s, Oshatz reimagined a steep, rocky hill in Lake Oswego, and turned it into the unique Elk Rock Road Residence. Known locally as the Funnel House, this structure defies convention, starting narrow and expanding upward like a funnel...