“It was important to us to make everything look original again,” Broere says of the two homes, built in the early 1950s of concrete block and mahogany, with Wright’s preferred red concrete floor and textile blocks patterned with window cutouts. Looking at the houses today, it’s hard to tell that they aren’t brand new.

The houses, part of Wright’s Usonian portfolio of houses designed to be stylishly modern and affordable for middle-class people to build, are about 154 miles from downtown Chicago in a rural setting near Kalamazoo, Mich., in The Acres, where several scientists at The Upjohn Company got together in the 1940s and 1950s to build Wright houses. A group of their colleagues also built Wright houses in Kalamazoo, and together the two developments showcase Wright’s vision of an American, affordable residential architecture.

Broere and Hillebrandt have two of the four Wright houses in The Acres, with a total of four acres of land. They’re two of only five houses in the 72 acres of the The Acres, with abundant wildlife, woods and a pond.

Now planning to buy a home in France near their family in the Netherlands, the couple are putting the pair of Wright houses up for sale soon and gave Crain’s readers a first look. The asking price for the pair is $4.5 million. The listing agents are Victoria Krause Schutte of @properties Christie’s International Real Estate in Oak Park and Fred Taber of Jaqua Realtors in Portage, Mich.