I made a tour reservation to go see the Affleck House next month (they only offer tours one day each month). 

“The first Frank Lloyd Wright-designed house to be built in the Detroit metropolitan area, the Affleck House represents one of the finest examples in the world of the architect’s Usonian style, the last great period of Wright’s career. Designed to exist in harmony with the home’s site and nature, the Affleck House was a part of Wright’s attempt to meet the need for low-cost housing for the average American. The importance of the house is borne by the fact that it was placed on the Michigan Register of Historic Places in 1978 and the National Register of Historic Places in 1985. The Michigan Society of Architects includes the house among Michigan’s 50 most significant structures.”

(Source: ltu.edu)