After Frank Lloyd Wright built the first Usonian home in Madison, Wisconsin, in 1936, he spent decades iterating on his concept of affordable middle-class housing, tweaking angles and rooflines so that each design, while almost always single-story and full of windows, was still slightly different. Take this Usonian in Glenview, a suburb about 40 minutes north of Chicago, which has around 80 Wright-designed homes in its metro area. Commissioned in 1950 by local John Carr, the L-shape, 1,800-square-foot house sits on three acres with more than 50 oak trees, just a few minutes west of town center.