Half of a tycoon's twin $78M mansions: Shelter Island, Montana

Real estate magnate Don Abbey custom-built homes for himself in Montana and outside Los Angeles -- then decided to put them both on the market. His Shelter Island estate is the largest home for sale in Montana, at 24,000 square feet. It's listed at $78 million.

Read more about Abbey's two $78 million estates on the market on Yahoo! Homes' Spaces blog. And to see even more photos, go to Zillow Blog.

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An aerial view of the estate. The Shelter Island home has a boathouse mechanism that allows a water craft to be brought from the lake into moorage under the home without anyone ever having to walk on a dock. Read more about the estate on Yahoo! Homes' Spaces blog.
An aerial view of the estate. The Shelter Island home has a boathouse mechanism that allows a water craft to be brought from the lake into moorage under the home without anyone ever having to walk on a dock. Read more about the estate on Yahoo! Homes' Spaces blog.