Sitting in the offices of Bohlin Cywinski Jackson (BCJ) in Pittsburgh, Bill James pulls out a drawing of a site about an hour and a half’s drive south of the city. The building, the young architect explains, embraces its edge condition. At the front sits the forest of the Bear Run Nature Reserve; at the back, a meadow. The four dwelling units, encased in cedar-stained shale-gray, rest on nimble steel posts, barely touching the sloping ground. Each is positioned to capture the breezes up the valley and the views back down.