One of Wright's prefabricated homes built 46 years ago in Lisle is threatened with demolition. The previous owner made no provisions in his will to save the structure, in which walls are crumbling and the ceiling is cracked. However, while other homes of the same design remain, any demolition is an "emotional loss." The developer eyeing the property wants to replace the building with three new homes expected to bring $900,000 apiece.