The fate of an 8,500-square-foot house designed in 1970 by architect Romaldo Giurgola in Wayzata, Minnesota hangs in the balance following  what the Minneapolis Star-Tribune reported as 2012’s priciest single-family housing deal in the Twin Cities. Just months after paying $10 million for the lakefront property, the new owner, Cargill heir Donald C. MacMillan, has presented plans that could include the building’s demolition.

While considering the possibility of relocating or repurposing the modernist residence, MacMillan could choose to replace it with a new larger structure. He hopes to build a 9,095-square-foot stone and wood home and a 2,086-square-foot guest and pool house to replace the modern structure. Plans also include a lakefront 250-square-foot boathouse.

The main feature of the existing home is a 24-foot cube with deliberately placed windows that capture light and views throughout the day. Quirky, curved sections unravel from the cube, spreading the living areas out into the lush backyard. The original owners had asked Giurgola, “a next generation architect,” to create a dramatic backdrop for their large art collection.