This 1992-built architectural statement from daring designer Ed Niles appeared on the open market this winter with a $20 million asking price. The home has never been offered for sale before.

The residence’s 4,400 square feet of living space is divided into numerous compartments, with the private living areas enclosed in a segmented structure; a skywalk connects the private space to the public one, a soaring great room in a half circle-shaped structure that looks something like a turbine. This section of the home features a sunset-like wall of glass panes overlooking the water.

Glass and steel are the primary materials, with frosted glass and neutral-toned tile employed as well. The home’s sense of connection with its landscape is unusually acute, and as interesting as the home’s engineering is the natural world is always present just outside the glassy rooms, as the 1.98-acre property’s many mature plantings buttress the exterior walls.